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914World.com _ 914World Garage _ 901 VS 915 TRANSMISSION

Posted by: RUDEPEST Mar 1 2005, 02:56 PM

I have a 73 914 with a 450 hp v8 and have went through 3 transmission and am in the process of putting a 915 in it with a wevo side sift kit installed but I was told that I need to change the gears to work and was hoping that someone out there could help with the proper gears so I don't have to spend money learning which gears work.

thanks,
Keith

Posted by: bd1308 Mar 1 2005, 03:05 PM

that is the longest sentence i have ever seen breathe man......just breathe

Posted by: Travis Neff Mar 1 2005, 03:12 PM

You need to flip the Ring and pinion around, aside from that you should be ready to roll. I am sure there are gearsets that are better choices than stock, but you shouldn't have to change it to get it to work.

Posted by: Aaron Cox Mar 1 2005, 03:17 PM

are you asking if you need taller gears that would optimize your v8's drivability ?

Posted by: skline Mar 1 2005, 03:17 PM

QUOTE (Travis Neff @ Mar 1 2005, 01:12 PM)
You need to flip the Ring and pinion around, aside from that you should be ready to roll. I am sure there are gearsets that are better choices than stock, but you shouldn't have to change it to get it to work.

He is right, the gears should work just fine but you will need to get the ring and pinion flipped and that is not a cheap endeavor. I have heard others say you can just run it upside down but logically thinking, what the hell difference would that make? I have always wanted to ask that question when someone says it.

Posted by: rick 918-S Mar 1 2005, 03:20 PM

We've got to see this!

Posted by: BIGKAT_83 Mar 1 2005, 03:21 PM

Running it upside down would be the same as flipping the ring gear and pinion. Its not that big of deal on a 915 to change. Its the 930 that takes all of the machine work.

Bob

Posted by: phantom914 Mar 1 2005, 03:21 PM

QUOTE (skline @ Mar 1 2005, 01:17 PM)

QUOTE (Travis Neff @ Mar 1 2005, 01:12 PM)
You need to flip the Ring and pinion around, aside from that you should be ready to roll. I am sure there are gearsets that are better choices than stock, but you shouldn't have to change it to get it to work.

He is right, the gears should work just fine but you will need to get the ring and pinion flipped and that is not a cheap endeavor. I have heard others say you can just run it upside down but logically thinking, what the hell difference would that make? I have always wanted to ask that question when someone says it.

Scott,

Running it upside down would be exactly like flipping the ring and pinion as far as the direction the tranny would turn. I don't know what other issues would come up though such as where the lube would sit, how would you drain it etc..

Andrew

Posted by: skline Mar 1 2005, 03:29 PM

So, I am thinking, if you run it upside down, you now have 5 reverse gears and 1 forward gear. What am I missing?

Posted by: bondo Mar 1 2005, 03:30 PM

For 450 HP I'd say neither. You probably won't be happy with the 915 gearing, and by the time you change it you coulda had a 930. You may break the 915 too, 450 HP is stretching it. How long have your 901s been lasting?

Posted by: BIGKAT_83 Mar 1 2005, 03:33 PM

QUOTE (skline @ Mar 1 2005, 04:29 PM)
So, I am thinking, if you run it upside down, you now have 5 reverse gears and 1 forward gear. What am I missing?

Wrong you would have 5 forward and a reverse running a upside down 915 in a mid engine car.

Posted by: Aaron Cox Mar 1 2005, 03:33 PM

QUOTE (skline @ Mar 1 2005, 02:29 PM)
So, I am thinking, if you run it upside down, you now have 5 reverse gears and 1 forward gear. What am I missing?

lets say the output shafts are turning clockwise......
flip it up side down and now they run anti clockwise

think long and hard scott

Posted by: RUDEPEST Mar 1 2005, 03:36 PM

thanks for the replies. I have already fliped the ring and pinion. All you do is flip it over with no machining needed.
I haven't used the tranny to know what is wrong or not, but I want to be able to use first gear. The 901 tranny's first gear is like a granny low and I'm not into rock crawling my 914. A friend is a fan of the 901 and dislikes the 915 so he is trying to make me run the 901, but it just can't hold the HP.

Keith

Posted by: phantom914 Mar 1 2005, 03:36 PM

QUOTE (skline @ Mar 1 2005, 01:29 PM)
So, I am thinking, if you run it upside down, you now have 5 reverse gears and 1 forward gear. What am I missing?

Scott,

That's what would happen if you don't flip the ring and pinion or run it upside-down. You rotated the tranny 180deg when you moved it from rear drive to mid-engine, that's why it would run backwards. To fix, you flip the ring to the other side of the pinion, whether by re-installing, or by flipping the whole tranny.

Listen to Aaron. He's right for once.

Andrew

Posted by: skline Mar 1 2005, 03:42 PM

Ok, I get it now. This is a first for Aaron. Good boy!!!

Posted by: RUDEPEST Mar 1 2005, 03:42 PM

The 901 trannys haven't broke but I can tell the two main shafts are begining to separate because the tranny starts making more noise. I usally swap them before explosion happens. After taking the tranny's apart you can tell explosion was going to happen shortly.

Keith

Posted by: Type 4 Mar 1 2005, 03:58 PM

To make a 901 last you need to swap out the intermediate plate for an Aluminum one, replace the two Bearings with brass roller retainers, with new bearings that have steel roller retainers. Where the intermediate plate bolts together remove the short studs and replace with thru bolts.

HERE IS THE MOST IMPORTANT PART

Let the gearbox WARM UP.
Dont apply full power with a cold gearbox.
iIf you do the above a 901 will handle 300hp.

Posted by: Travis Neff Mar 1 2005, 04:20 PM

If a 915 has a vent at the top like a 901, your garage is gonna look a little sloppy flipping it over. I heard of running the tranny upside down, and one of the benefits is that most of the weight is now lower. Never did it, never saw it or whatever..

Oh, if you have a 915 with the later R/P 8.xx ratio instead of the 7.15 that will help (I think they changed to the taller ratio R/P in 74)

Posted by: Aaron Cox Mar 1 2005, 04:23 PM

QUOTE (skline @ Mar 1 2005, 02:42 PM)
Ok, I get it now. This is a first for Aaron. Good boy!!!

whatever scott! how many times have i proved you wrong in your own garage?????

the gt rear swaybar? the stock rear springrate? the year fo door sill changes???? i know you remember those

bite me

Posted by: Andyrew Mar 1 2005, 05:02 PM

Call Renegade hybrids... They have a solution for the 915 trani for gearing...

off their web site
"CUSTOM 3.1:1 TALL RING & PINION: The stock gear ratios in the 915 are rather low for use with a V-8. Thus, we offer our custom made, tall ring and pinion, which will dramatically increase your top speed in each gear. Installing this ring and pinion in a 915 transaxle will create ideal gear ratios for use with a V-8 engine.
"

Posted by: MattR Mar 1 2005, 05:07 PM

QUOTE (Aaron Cox @ Mar 1 2005, 02:23 PM)

QUOTE (skline @ Mar 1 2005, 02:42 PM)
Ok, I get it now. This is a first for Aaron. Good boy!!!

whatever scott! how many times have i proved you wrong in your own garage?????

the gt rear swaybar? the stock rear springrate? the year fo door sill changes???? i know you remember those

bite me

*cough* exhaust gaskets *cough*

I was a witness. Aaron still owes scott 5 bucks.

Posted by: chunger Mar 1 2005, 05:19 PM

I hear there's a custom R&P set that is geared taller $$$ , but if you've already got the Wevo going on, you're already too deep into this trans to get into a 930 reaasonably. . . if you figure in shift linkage.

I hear 1st gear is too low and 2nd gear too high in the 915 stock.

-'Chung

Posted by: sj914 Mar 1 2005, 05:42 PM

QUOTE (chunger @ Mar 1 2005, 03:19 PM)
I hear there's a custom R&P set that is geared taller $$$

-'Chung

I think those are already NLA.

Posted by: chunger Mar 1 2005, 05:48 PM

That makes sense. . . at the time I was looking supplies were short, and the manufacturer did not plan on making another batch.

-'Chung

Posted by: Travis Neff Mar 1 2005, 05:58 PM

whats the ballpark on the R/P? a kilobuck?

Posted by: ewdysar Mar 1 2005, 06:22 PM

The 3.10 R&P is NLA. One sold just over a year ago for about $1500.

Posted by: nine14cats Mar 1 2005, 06:40 PM

Check with Rod Simpson. I talked with him late last year and he had (2) sets of the 3.1:1 tall R&P left to sell. He was asking $1600 for each.

Bill P.

Posted by: airsix Mar 1 2005, 06:45 PM

QUOTE (Travis Neff @ Mar 1 2005, 02:20 PM)
If a 915 has a vent at the top like a 901, your garage is gonna look a little sloppy flipping it over. I heard of running the tranny upside down, and one of the benefits is that most of the weight is now lower. Never did it, never saw it or whatever..

Actually, if you run the tranny upside-down the weight is moved higher - however, the output shafts are higher too, which can be a good thing on a car that has been lowered a lot. In fact, the factory ran the 915 upside down in the 935 turbo for just that reason. They also relocated the vent, used an external cooler, and added a pump for lubrication.

-Ben M.

Posted by: East coaster Mar 1 2005, 07:28 PM

I believe flipping the R&P in a 915 does require machine work. At least I had to pay for machine work when mine was flipped. I think the case has to be clearanced. Wevo 915 = $$$$, I'm 9g's into mine with tranny/parts/labor/shipping. Good luck!

Posted by: Sammy Mar 1 2005, 08:21 PM

Have you dyno'd that engine? What are the torque values?
Horsepower doesn't hurt 901s, torque does.

Posted by: Brett W Mar 1 2005, 08:21 PM

The only way to make the 901 last behind a V8 is to either not enjoy the benefits of a V8 or put the 901 on a shelf and cover it in plastic. Then it would last indefinitely.

For the price of a custom 915 or 930 go ahead and setp up to the Mendolla transaxle. They are stong enough for 500+ and they are in my opinion a better value. For the same money, as a rebuilt 915, you can get the right gears, mid-engine setup, etc.

Now if you want some real power maybe and X-trac will be in your future. Should be good for 800+ but that whole straight cut gears will really cut into the radio on a long trip.

Posted by: Sammy Mar 1 2005, 08:27 PM

I have to strongly disagree.

i rebuilt a 901 and bolted it up to a V8, never had a bit of problems and i drove it hard.
Finishing 7th out of 60 cars (with 10 instructors) kind of hard. I drove it hard and raced it hard, but always respected the machine.
If you abuse a transmission it will fail, even with a 1.7.
i could break a 915 or a 930 transmission if I really tried.

if you exceed the torque capabilities, a 901 will fail also, but I believe most 901 failures are not due to excessive torque, but abuse. It happens but not that often.

Scott Mann had a 901 behind his V8 (with a claimed 565 hp? ) and it last for many years and he pushed the limit constantly.

Posted by: Andyrew Mar 1 2005, 08:34 PM

Brett, Elaborate on the mendolla trani...

Posted by: Rider914 Mar 1 2005, 08:35 PM

QUOTE (RUDEPEST @ Mar 1 2005, 01:36 PM)
thanks for the replies. I have already fliped the ring and pinion. All you do is flip it over with no machining needed.
I haven't used the tranny to know what is wrong or not, but I want to be able to use first gear. The 901 tranny's first gear is like a granny low and I'm not into rock crawling my 914. A friend is a fan of the 901 and dislikes the 915 so he is trying to make me run the 901, but it just can't hold the HP.

Keith

Do Not Use 1st Gear!!

This is what splits your 914/901. . . I have many years on mine, only 400hp

Posted by: Gary Mar 1 2005, 08:39 PM

QUOTE (Andyrew @ Mar 1 2005, 06:34 PM)
Brett, Elaborate on the mendolla trani...

I'm not Brett but,

http://www.mendeolatransaxles.com/

Posted by: airsix Mar 1 2005, 09:12 PM

QUOTE (Sammy @ Mar 1 2005, 06:27 PM)
I have to strongly disagree.

i rebuilt a 901 and bolted it up to a V8, never had a bit of problems and i drove it hard.

Sammy, this is meant as no disrespect - I hold you in high regard w/ full Guru status. (Seriously) Ok, then... You have to take into consideration how much you drove the car like that. You drove it for less than a year didn't you? It held up to what you demanded of it, but for how many miles? 1,000? 3,000? Would it hold up to that kind of driving for another 40,000? Probably not IMHO.

-Ben M.

Posted by: jd74914 Mar 1 2005, 09:31 PM

But, say a 901 lasts for 10,000 miles; then you blow it. You jus go out and get a new one, after all, they are really cheap and plentiful. How many 901's would you need to go through to equal the cost of a wevo 915?

Posted by: Andyrew Mar 1 2005, 09:41 PM

Whats the cost of a wevo 915? 5k?? More??

901 trani's can be had for 100 to 500, or more.

Ebay at 250 all the time. Rebuilt at 400 on ebay.

sooo... 10-15 trani's at minimum??

Wana know in all honestly what I would do if I had a 915 trani? I would start modifying my engine, and then one day put on a turbo and make 600rwhp...

then bam, no more 915...

I think of the 901's as limiters

Posted by: jd74914 Mar 1 2005, 09:46 PM

You've got a valid point.

I think in terms of a really CSOB, who likes playing with chevys too. We need a C6 auto or Turbo 350 for midengines. Something really strong and REALLY cheap (atleast they are around here)

Posted by: Andyrew Mar 1 2005, 09:52 PM

Yup. Really need a trani like that.. But unfortunately, for that to happen we would need to have 2 million 914 v8 owners, and v8 conversions to be around for 20 years strong...

For now, I guess we can go with 915's as strong cheap(relatively) trani's..

I plan on buying one in about 3 months or so.. Depending on how well the 901 trani holds up at the wcc (I'll be bringin spare trani's, cv's, trailing arms, bearings, calipers, linkage, wheels, cables, plumbing, ext.. lol)

Andrew

Posted by: boxstr Mar 1 2005, 10:00 PM

Holy crap this is the way to go,they even have a sequential box, only $10k. I am going out the tommorrow and check it out. http://www.markssandtrans.com/
CCLINSHIFTYGUY

Posted by: Type 4 Mar 1 2005, 10:08 PM

That box has 4.57 R&P. Off road gearboxes have gearing for Big diameter tires.

Posted by: boxstr Mar 1 2005, 10:16 PM

I have a feeling they can custom gear to my specs and or intended usage. At least they had better be able to for those prices.
CCLINGEARINGUP

Posted by: andys Mar 1 2005, 10:24 PM

450HP narrows your transaxle choices severely. If it's a track car you're mostly considering, then the transaxles with the straight cut gears would not be an issue. For the street; forget it......way too noisey. For your kind of power, the two reasonably priced choises are the 930 (which can be run up-side-down to save on costs), or for a few more $$ go with the ZF (like used in the Pantera). Both of these will already have ratio's suitable for a V8.

Andy

Posted by: Brett W Mar 1 2005, 11:39 PM

Here is my major dilemma with the V8 conversions, I don't want to baby it and wait for the next shoe to drop. If I have a T56 6 speed tranny behind a V8 I don't have to be careful what gear I start off in. I drop the hammer and go. That is what a V8 teener should do. In the spirit of Porsche it should be able to handle a little abuse. I can't stand cars that I can't hammer every now and then. Not all the time but when I want to run it better be able to keep up.

Mendeola does a sequential box that seems like a nice box. I would just rather have a good standard gear box that can take the power. Why bother putting a V8 in a teener if you can't take advantage of the power capabilities. I know the car weighs 2600lbs, but if you got 247+ cubic inches then why not make use of it.

The cost of a 930 box is close to 10K, the same goes for the Pantera box. Mendeola can get you a box for 6-8K$ that will be able to handle the power and the parts will be easy to find. Plus you get an over drive or a very tight ratio box for your street terror.

Posted by: Aaron Cox Mar 2 2005, 12:17 AM

ZF transaxle out of a pantera - PROBLEM SOLVED

Posted by: Sammy Mar 2 2005, 02:31 AM

Ben, absolutely right.
I drove the car for about a year and a half, prolly around 4000 hard miles.
After that it was shifting better thasn when I put it in. How long would it last? Who knows. Maybe 5 years, maybe more.
I paid $75 for the tranny and $50 rebuilding it (gasket set, had all the spare parts necessary).

Many years ago Brad and I had a conversation about an Audi turbo 5000 automatic transmission.

He said it would work and would be tough enough (it uses some of the same internals as a ford C4), I never got any farther than taking some measurements.

That may be the answer. Those trannys are available in the pick a parts occasionally.

Posted by: Brett W Mar 2 2005, 08:20 AM

The Audi 5000 tranny is worth a look. It supposedly can handle 450 but there are dissenting opinions on whether or not it can handle any power. Some say yes others say nay. They will allow you to run 930 CVs and different axels. You will have to do a different shifter as the mechanism is on top of the tranny. The gear ratios aren't bad for a V8. The turbo box is a little better as far as ratios. There is a lot of info out there about them.

The G50 is a better choice. They are getting pretty easy to find although price is quiet a bit more than a 915 they are strong boxes.

Posted by: BIGKAT_83 Mar 2 2005, 08:48 AM

When I did my 914/350 sbc conversion I'd heard all of the stories about 914/901 transaxles and was very worried about this. I managed to buy 4 extra sideshifts at a steal and figured this would take care of the problem.

I've driven my car ~10k miles and I'm still on the first Transaxle and I don't baby it. I'm able to spin the 255/40 tires at will and do almost every time I drive the car. The 914/901 has really surprized me on how tuff it is. I think the secret is to start with a GOOD transaxle and not a 30 year old POS.
I do recommend that you use the larger 86mm 911 cv joints and axles.

Bob

Posted by: Sammy Mar 2 2005, 10:23 AM

With my V8 914 I only used 1st for creeping into the garage or on a trailer to go racing, but on many, many occasions I lit up the tires in second gear because someone wanted to see it or whatever.
I had victoracers on it (205-50-15) so they were plenty sticky. I didn't have an LSD but could leave two nearly identical marks on the pavement for as long as I wanted to rev the engine.

One time at Irwindale a guy came up to me and asked, "how can you post such fast times with your clutch slipping so badly?"
I said "clutch, my clutch isn't slipping."
He commented that he can hear my engine rev up to redline out of every corner like the clutch is slipping.
I told him that wasn't the clutch, it was the back tires
I swear I could steer that car with my right foot. Almost felt like a rally car.

On the right track, I could and did shift from 2nd to 3rd without even using the clutch and never damaged anything.

Posted by: Steve Mar 2 2005, 10:45 AM

Before you guys jump onto the Pantera ZF bandwagen I would check with the Pantera club and some Pantera owners.
It might have the gear ratios for a V8, but according to the Pantera club and Pantera owners that I have talked to the trans blows up if you modify the Ford 351 cleveland to much over stock.
They didn't give me any HP rule of thumb numbers.
They just said beware and leave the engine stock.
I wonder what a stock 351 cleveland puts out??

Posted by: Travis Neff Mar 2 2005, 10:58 AM

The pantera owners will also say the weak link in the whole car is the ZF transaxle. When it goes it takes cubic dollars to repair it.

Posted by: andys Mar 2 2005, 11:01 AM

QUOTE (BIGKAT_83 @ Mar 2 2005, 06:48 AM)
When I did my 914/350 sbc conversion I'd heard all of the stories about 914/901 transaxles and was very worried about this. I managed to buy 4 extra sideshifts at a steal and figured this would take care of the problem.

I've driven my car ~10k miles and I'm still on the first Transaxle and I don't baby it. I'm able to spin the 255/40 tires at will and do almost every time I drive the car. The 914/901 has really surprized me on how tuff it is. I think the secret is to start with a GOOD transaxle and not a 30 year old POS.
I do recommend that you use the larger 86mm 911 cv joints and axles.

Bob

Ahhhh, the magical and intangeable ingrediant............It's all how you drive 'em. Some can and do have the ability to drive them kindly, yet aggressively. Others' can and do destroy just about anything they drive, and blame the trans. Some people just don't have the feel for it....Not trying to offfend anyone, it's simply a hard learned reality. Of course there is a power threshold that when crossed, will break things irregardless.

When I was looking to buy a 914 about 1 1/2 years ago, I ran across a guy that had an 8 or 10 y/o conversion with the 330HP crate motor (I don't remember the designation, but I believe it's the iron head version of the earlier ZZ3). Beautiful car done in white, 911 brakes, Fuchs, etc. Anyway, he never had a trans let go since he did the conversion, and admitted that he drives it real hard.

Andy

Posted by: Type 4 Mar 2 2005, 11:15 AM

Jeff at Transaxle Eng. builds the Fortin gearbox for the Offroad guys it uses Audi guts in a cases built for use as a north south transaxle.

http://www.fortinracing.com/transaxles.html

There are some use Fortin's available for sale If you would like to buy one send me an email.

Posted by: jd74914 Mar 2 2005, 02:38 PM

QUOTE (Brett W @ Mar 2 2005, 06:20 AM)
The Audi 5000 tranny is worth a look. It supposedly can handle 450 but there are dissenting opinions on whether or not it can handle any power. Some say yes others say nay. They will allow you to run 930 CVs and different axels. You will have to do a different shifter as the mechanism is on top of the tranny. The gear ratios aren't bad for a V8. The turbo box is a little better as far as ratios. There is a lot of info out there about them.

My friend retrofited it to his old audi drag car and it handles about 350hp with lots of drag lauches. He's been launching it with a new, and larger, turbo with more boost and its been fine.

How about the manuals out of the newer mustangs. My friends uncle has one that puts 450hp onto the pavement, and he doesn't hesitate to drag. It hasn't broken yet.

Lastly, the same guy has a '74 Pantera with a totally rebuilt and bored out 351C. He doesn't baby his tranny and it hasn't blown up yet (I don't know if it has been beefed up though. I know the mustang tranny hasn't).

Posted by: neo914-6 Mar 2 2005, 07:33 PM

QUOTE
The G50 is a better choice. They are getting pretty easy to find although price is quiet a bit more than a 915 they are strong boxes.

All true but they are heavy and long enough to stick out...

Posted by: marks914 Mar 2 2005, 07:44 PM

450 HP? Tell us about the engine, thats pretty potent, virtually undrivable for the street. Has it been dynoed? I do not think you can just simpy flip the gear, there is some machine work ...
_Mark

Posted by: redshift Mar 2 2005, 07:46 PM

For 17k, you get a 6 speed ZF, that won't break when you hand it 1000bhp, all at once.

For around 10k, you get a 5 speed ZF that won't break when you hand it 1000bhp, all at once.

For around 7k, you get a ZF that you can throw 500bhp at, and that's NOS, without mods.

M

Posted by: Brett W Mar 2 2005, 11:02 PM

http://www.quaife.co.uk/catalogue/page11.htm

Nice 6 speed box with a lot of options. Price is nice too. As much as a 930 box with better features. You can even go sequential for a few bucks more. It looks like the Quaife gearbox will be around awhile.

http://www.gt40s.com/ubbthreads/showflat.php?Cat=0&Board=UBB6&Number=45540&page=vc&fpart=1
Read what these guys have to say about the ZF box.

Too bad we can't fit a Corvette box in out cars. They are all shaped the wrong way, but they are stout enough for 700+. It is the same box that is in the Mustangs. Tremec makes nice trannies.

The Fortin gear boxes are 13-15k new and 9K used. The X-trac is, unfortunately 30-35K.

Miles where did you get the specs on the ZF box.

Posted by: redshift Mar 2 2005, 11:13 PM

Chatting with a couple Pantera guys, when I was looking at 'em last year. One guy had about 700hp, monster 427, on the 5 speed modded one.

The Pantera I had was not modded at all, and besides the nice Italian driving position (knees in neck, arms outstretched) the thing I remember most about it was the clunky shift gates.

http://www.pim.net/expertzf.html

If I were going to throw a new car, at a 914, I'd start right there..

Hey, $1k price drop?!

M

Posted by: Gary Mar 2 2005, 11:16 PM

QUOTE (Brett W @ Mar 2 2005, 09:02 PM)
http://www.quaife.co.uk/catalogue/page11.htm

Nice 6 speed box with a lot of options. Price is nice too. As much as a 930 box with better features. You can even go sequential for a few bucks more. It looks like the Quaife gearbox will be around awhile.

Current exchange rate for 7975 GBP is $15,250.46...

Posted by: Brett W Mar 2 2005, 11:18 PM

Thanks for the info. Too bad the Pantera used a Ford motor.

Posted by: andys Mar 2 2005, 11:28 PM

New ZF's are available through RBT in Orange County, CA http://www.rbttrans.com/
NOS, but the castings are updated, as are some of the internals. Best ask them directly about the ratings.

Andy

Posted by: cdmcse Mar 3 2005, 01:37 AM

Is the 944 transaxle worth using? Some of the 951 guys make some pretty good hp.

Posted by: BIGKAT_83 Mar 3 2005, 06:18 AM

QUOTE (Brett W @ Mar 3 2005, 12:02 AM)
http://www.quaife.co.uk/catalogue/page11.htm

Nice 6 speed box with a lot of options. Price is nice too. As much as a 930 box with better features. You can even go sequential for a few bucks more. It looks like the Quaife gearbox will be around awhile.

http://www.gt40s.com/ubbthreads/showflat.php?Cat=0&Board=UBB6&Number=45540&page=vc&fpart=1
Read what these guys have to say about the ZF box.

Too bad we can't fit a Corvette box in out cars. They are all shaped the wrong way, but they are stout enough for 700+. It is the same box that is in the Mustangs. Tremec makes nice trannies.

The Fortin gear boxes are 13-15k new and 9K used. The X-trac is, unfortunately 30-35K.

Miles where did you get the specs on the ZF box.

Brett which one of these will you be using in your race car ?

Posted by: Brett W Mar 3 2005, 07:30 AM

I am going to start out with a 901, just to meet a deadline. Then I may try the Audi box, depending on what I find when I do some further research. In the end I will probably end up with something like the Quaife or Mendeola, unless i find something better in the mean time. I would like an X-trac but I am not independently wealthy, yet.

Posted by: Andyrew Mar 3 2005, 09:07 AM

The 951 trani is not set up to have a clutch in that area, 951's and 944's have a long driveshaft that link the clutch package (by the engine) to the trani.
Also there is no place for a starter.

Thought about that one for a long, long time...

Posted by: Brett W Mar 3 2005, 02:04 PM

I am not referring to the 951/944 gear box. I am referring to the Audi 5000 turbo gear box.

Posted by: Travis Neff Mar 3 2005, 02:12 PM

Brett, what are you doing for an engine to warrant a monster trans?

Posted by: Brett W Mar 3 2005, 02:18 PM

It is a secret for now. When things get a little closer to the deadline I will share the info.

Posted by: Brett W Mar 3 2005, 02:34 PM

heres a hint:

Attached image(s)

Posted by: Travis Neff Mar 3 2005, 02:37 PM

tractor equipment?

You gonna have to notch your targa bar for something like that to fit. That gives a new meaning to the tower of power

Posted by: bondo Mar 3 2005, 02:37 PM

QUOTE (Brett W @ Mar 3 2005, 01:34 PM)
heres a hint:

Oh my.

Posted by: andys Mar 3 2005, 02:41 PM

QUOTE (Brett W @ Mar 3 2005, 12:04 PM)
I am not referring to the 951/944 gear box. I am referring to the Audi 5000 turbo gear box.

If you are thinking the manual transaxle, then there are some issues you ought to perhaps consider. Unless you get an 016 3U model (which was never available in the US), then the ratios are not very well matched to a V8. This transaxle is not the answer to high HP V8's. It's internals are a click below those of the 951 internals, as Porsche implemented some subtle but significant strengthening to it (even though both are considered the model 016). They top out at about 400HP if driven gently. There's lots of discussion on the GT40 replica forum in this regard. If you're thinking automatic, then non of the above applies.

Andy

Posted by: Brett W Mar 3 2005, 02:59 PM

Yeah I found a GT 40 forum and have been reading the post about transaxels for the last 24 hours. Since the proposed motor is a little different as far as the torque curve goes I think the gears should match OK but I am giong to do some more research first. The deadline will be met with a 901 but in the future something else will have to be done.

Posted by: Andyrew Mar 3 2005, 03:41 PM

Brett, my post was in response to.
QUOTE (cdmcse @ Mar 3 2005, 12:37 AM)
Is the 944 transaxle worth using? Some of the 951 guys make some pretty good hp.

I agree with what your saying on the subject

btw, That engine scares me...

Posted by: Aaron Cox Mar 3 2005, 03:52 PM

brett--

OHC lexus v8 motor

Posted by: Wild 6 Mar 3 2005, 03:59 PM

I have the 915 gearbox w/Wevo sideshift and internal Wevo gateshift with a high power 993 engine. It really works quite well. Transaxle Engineering in North LA will flip the ring and pinion and freshen the box very inexpensively.

I have a friend who runs the 930 in a 914 TT. You have to cut the trunk if you turn the 930 gearbox upside down. Also, you have to run a cable shifter. He will tell you that the 915 with Wevo is a better way to go.

Hope this helps.

P.S. Drive the car before deciding on the gear change. I geared my car for the local tracks in Arizona.

Posted by: Travis Neff Mar 3 2005, 04:37 PM

Wild 6, tell us more about your car

Posted by: Brett W Mar 3 2005, 10:44 PM

Sorry Andrew.

QUOTE
ou have to cut the trunk if you turn the 930 gearbox upside down.

Probably not a problem.

QUOTE
OHC lexus v8 motor

Why what ever could you be referring to?