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> AX transmission
J P Stein
post Mar 16 2003, 06:52 PM
Post #21


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I wasn't doubting him, just a bit surprised.

I was doing some calcumulating and came up with about the same thing. I was going faster than I thought.

7300 rpms with 23.5 inch dia tires in second comes out to a bit over 60 mph.....38 in 1st. I've been known to.....ahem... bounce off the limiter while trying out a new course. I need one of them shift light thingys.....a big RED mofo.
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Bleyseng
post Mar 16 2003, 06:53 PM
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Chris, you must be talking about Jason or Chris...can't remember who drives the white 914 or the blue 914.
For Bremerton the shorter tires are great! Drop down to 205x50's and you will see what I mean. I have put switching 3rd gear on the list when I go thru my extra tranny but that isn't happening soon.

I agree with DD to just bring and run what you have instead of changing the car all the time. Seat time will let you learn how to make the car faster. Later on you can improve the car to how you want it to drive.
If you watch Chris and Jason they both drive very smooth and effortless and don't seem to be going fast at all until the time is posted! They beat alot of 911 with twice the hp all the time.
I'll be there this Saturday even if it rains.....probably will too!

Geoff
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ChrisReale
post Mar 16 2003, 07:02 PM
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Yup, its Chris. He is actually my girlfriends parents neighbor. Small world...well at least in West Seattle
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Bleyseng
post Mar 16 2003, 08:08 PM
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Ahh the blue car is nice, very fast too. The story he tells is his grandfather setup/built it.
What size tires are you running?
Geoff
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ChrisReale
post Mar 16 2003, 08:28 PM
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This season Im just gonna beat the shit out of the Yoko's I have on. 195-60-15. Id like to find a set of Mahle's so I could mount dome 205'50's on. Prolly Kuhmo Victo's. Yea, his grandfather was the one who had it, and I believe he and his dad rebuilt the engine
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Brad Roberts
post Mar 16 2003, 08:36 PM
Post #26


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I have a wicked Excel gearchart that shows shift points and lists all the 901 available gearsets. If anybody would like me to put it on the server..I would be more than happy too. You can plug in any RPM and any ratio to "achieve" what you want.

B
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TimT
post Mar 16 2003, 09:11 PM
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Brad do you have the excel sheet from Stomski? or another one? I have 2 different excell apps for 901 gears, and was going to offer them up to the site.

( I developed neither, just would have to credit the authors)
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Brad Roberts
post Mar 16 2003, 09:17 PM
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The one I have is from a friend of mine who raced a GT2 914 in SCCA. He is a computer engineer (David Ferguson) I was getting tired of doing all the math on my own and voiced this to him.. he told me he had a sheet and that I could share it since he sold the car and all the parts.

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TimT
post Mar 16 2003, 09:23 PM
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Yea ferguson wrote the excel app I got from stomskis site. a link to a gear calculator would be cool.... it doesnt take up much server space either..

Brad get me a icon or gif I can use from my site.. Ill post a link to here
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campbellcj
post Mar 16 2003, 10:01 PM
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Count me in for the spreadsheet (IMG:style_emoticons/default/clap56.gif)

If my budget ever recovers from all the brutality in the last year, I will dive into the trans (LSD, 904 mainshaft, gears, cooling mods)
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Brad Roberts
post Mar 16 2003, 10:07 PM
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Chris,

I' have a 901 I can sell you. I'm going to a WEVO 915 before summer. Its the one I built last year for the tube car using a new Guard LSD (80%) It has 4 races on it with a mild 3.0 in front of it.

Tim,

You can use the logo on the front page of the website:
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Brad Roberts
post Mar 16 2003, 10:11 PM
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Oh.. email me the Ferguson gearcal... I have it on a computer at the shop that is turned off right now.

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campbellcj
post Mar 16 2003, 10:15 PM
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QUOTE(Brad Roberts @ Mar 16 2003, 08:07 PM)
I have a 901 I can sell you. I'm going to a WEVO 915 before summer. Its the one I built last year for the tube car using a new Guard LSD (80%) It has 4 races on it with a mild 3.0 in front of it.

Let me know when it becomes available. I still haven't gotten the six in the car and the trans is not gonna happen until after that. Too many friggen bills in my life lately. Damn job and finances always get in the way of the important stuff... (IMG:style_emoticons/default/pain30.gif)
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Brad Roberts
post Mar 16 2003, 10:21 PM
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I didnt figure you where in a hurry. I'll even gear it for your engine. It should be close right now.

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campbellcj
post Mar 17 2003, 12:28 AM
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Yeah but the big question is, will I keep driving the car mainly at the "short" tracks like Streets of Willow or partial Buttonwillow, or the longer/faster ones like Willow? Seems like gearing would be pretty different. I don't even know about the NorCal tracks yet; haven't ventured up there (soon though.)
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Mike T
post Mar 17 2003, 08:53 PM
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Here's my setup in my green car.
weight =1776 lbs
engine = Chevy 2.8 V6 approx 190 hp, 180 torque
tires = 23" Goodyear slicks
transaxle is internally stock except for 3rd gear, it's a close ratio(shorter) 1.41:1 I got by using a stock .071 5th gear set and switching their positions on the shafts where the drive becomes the driven gear. I've been using it this way for 3 seasons and it works great. Speeds in 2nd and 3rd at 7k 58mph and 77mph Good for most local autocrosses. It's actually like having a gearbox with a choice of two 2nd gears.

I can launch in 2nd and if the course warrants it, shift up to 3rd and just leave it. You don't want to shift too much on course, wastes time.


I learned about this trick on the old dgi.net Renegade forum. I remember some of you from there. I think. Did one of you tell me about this 5th/3rd gear switch?

Mike T
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Brad Roberts
post Mar 17 2003, 10:27 PM
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I didnt tell you, but we call this gear flip "KA" in the industry since they never actually made that ratio. This is THE cheapest way to get a shorter third.

I'll start a new thread.... for the downloadable gears stuff I have.


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Lawrence
post Mar 18 2003, 09:17 AM
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Yeah.. post it, please. I'd certainly be interested.

-Rusty
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porsche735
post Mar 18 2003, 07:19 PM
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The trick is thus:

Stock trans is:
1st 3.09=A
2nd 1.89=F 39% delta from 1st
3rd 1.26=N 33% delta from 2nd
4th 0.93=V 27% delta from 3rd
5th 0.71=ZD 23% delta from 4th

Do this:
1st 3.09=A
2nd 1.89=F 39% delta from 1st
3rd 1.41=KA 25% delta from 2nd (swapped 5th)
4th 1.08=R 23% delta from 3rd (swap 4th around)
5th 0.79=Z 26% delta from 4th (swapped 3rd)

This gives you a beautifully spaced gearbox (once you get out of 1st)

Do it, it's great....

Chris Kolstad
1973 914 2.0L (bummer stock ratios in my class, BP)
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Brad Roberts
post Mar 18 2003, 07:46 PM
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Chris,

how did the time trial go ??

B
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