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> Neo914 powerplant mates!!!!, Audi V6 twin turbo likes Boxster tranny
ajracer
post May 29 2005, 09:39 PM
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Photo # 2 Rear View

(The mounts have been fabricated and installated since this photo)

PS Even seems like enough room to add a Large muffler across the back !


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neo914-6
post May 29 2005, 09:47 PM
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Allan,

The photos are a bolted Boxster 5 speed to an Audi V6. I'm working in parallel with my V8 914 and 901 tall geared tranny, pictured.


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Brett W
post May 29 2005, 09:49 PM
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The Boxster tranny is not that great. The way I understand it the early trannies were not dealer servicable. The dealer threw the bad one away and got a new one. Here are the torque ratings on the Boxster tranny.

http://www.en.getrag.de/180/180
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neo914-6
post May 29 2005, 09:52 PM
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Allan,
BTW, have you addressed the axles? My 75 911 axles and CV's mated perfectly to an Audi 1.8t transaxle and were the correct length. They are too large, however for the boxster transaxle. I'm guessing the output flanges may be interchangeable.

Are you positioning the Boxster transaxle in line with the wheels or behind them for engine clearance as with all the V8 conversions?
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campbellcj
post May 29 2005, 10:12 PM
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Some of the parts I've had to replace are the throttle-body boot ("TBB"), diverter valves, and one that IIRC is fondly called the Y-pipe (but is really a hose). Apparently the stock hoses and clamps are not up to added boost. Also I had a water pump and a temp sensor fail early.

Check out the B5 S4 forum at www.audiworld.com for lots of info on these issues.

I am still debating whether to hang onto this car and maybe mod it further, or sell it and get something else (an RS6 is one possibility) as it's over 60K miles and could start getting expensive real quick as stuff starts going out. The suspension is already feeling mushy.
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Andyrew
post May 29 2005, 10:15 PM
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Felix.. what kind of headers are those?

I dont like how my car sounds (actually I do because I blew out my header gasket and now its loud (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)) and I want to put something with more flow and bigger pipes.

Andrew
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Dman
post May 29 2005, 10:50 PM
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Chris, if your front end is feeling loose you better take it in. There is a recall on the ball joints, while mine was in for that they also found the upper control arms were shot also. 60k miles on my car also.

This is a great thread! How heavy is the 2.7 compared to a flat 6?
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neo914-6
post May 29 2005, 10:57 PM
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QUOTE (Andyrew @ May 29 2005, 08:15 PM)
Felix.. what kind of headers are those?

Andrew

Hooker Competition, ceramic coated...
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neo914-6
post May 29 2005, 10:59 PM
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QUOTE (campbellcj @ May 29 2005, 08:12 PM)
Some of the parts I've had to replace are the throttle-body boot ("TBB"), diverter valves, and one that IIRC is fondly called the Y-pipe (but is really a hose). Apparently the stock hoses and clamps are not up to added boost. Also I had a water pump and a temp sensor fail early.

Check out the B5 S4 forum at www.audiworld.com for lots of info on these issues.

I am still debating whether to hang onto this car and maybe mod it further, or sell it and get something else (an RS6 is one possibility) as it's over 60K miles and could start getting expensive real quick as stuff starts going out. The suspension is already feeling mushy.

Chris,

I know about this weak part and would like the one-piece cast aluminum y-pipe... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)

It's toast after 60k? (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)
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Dman
post May 29 2005, 11:06 PM
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I think it is ~OK for a stock boost car but they say as soon as you chip this motor the Y pipe will
much more likely to go.
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Dman
post May 29 2005, 11:10 PM
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Although the site is down tonight, another good site for info is biturbo.com.
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neo914-6
post May 29 2005, 11:18 PM
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QUOTE (Dman @ May 29 2005, 09:10 PM)
Although the site is down tonight, another good site for info is biturbo.com.

Duane,

Thanks, always looking...

Here are a few:
http://www.audizine.com/
http://www.dynospotracing.com/
http://www.awe-tuning.com/
http://www.giacusa.com/
http://www.streetwerke.com/
http://www.newdimensions.com/
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MecGen
post May 30 2005, 05:02 AM
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Shit I am late for work...
Hey Neo, just curious...why not use the Audi trans?
Thats what I am leaning to, yours for sale ?
Later
Joe

(IMG:http://www.914world.com/bbs2/html/emoticons/burnout.gif)
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ajracer
post May 30 2005, 08:09 AM
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Felix:

The Axle flanges on the tranny and my (911 axles) are the same size, which if I
remember is 100 mm. with 6 bolts 8mm. The actual axles I will be using are likel
going to be VW bus axles which I understand provide a broader range of movement
and are the correct flange size. The length will be handled with axles spacers similar
to the RH (already have a mock up adapter for machining purposes) which will
speed up the process.

The alignment of the tranny output flanges is slightly to the rear with of the axle
flanges, however I have also modified my Front engine bar (DH) and Fabricated my
new tranny mounts to both be adjustable ( +- 1.5") in order to allow for later
installation of a FI trigger wheel off harmonic balancer when
I start phase II of this project and conver everything to the Corvette fuel injection
with MegaSquirt !
In my case the engine clearance look really decent and should not be a problem.

(Attached photo shows the trial fitting of Right side only mount for tranny, which
by the way is a 5 speed unit.)

Talk again soon.


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grantsfo
post May 30 2005, 09:30 AM
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QUOTE (Neo914 @ May 29 2005, 12:00 PM)

QUOTE
There are a growing number of Boxster drivers who have done the 3.4 conversion quite successfully.
Grant,
Did they do the 3.4 conversion with the 5-speed? I really wanted an “S” 6-speed but noticed too many differences on Jason’s tranny to match to the Audi engine. He has the full “S” drivetrain for his 914 and I would have followed this route but didn’t want to modify the engine bay and rear suspension. I never got to the point of creating a template to check bolt patterns when I noticed the starter pocket is on the top.

Yep I followed a guys project using the 5 spd tranny. He converted an older 2.5 to 3.4. I just cant remeber if he did any level of fabrication to get it to mate to the 5 speed. I do remeber it went together pretty quickly. At one point he had a site but it isnt online anymore.

I'd still love to see somone convert a 914 with either the 986 S 3.2 or the 996 3.4.
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Mueller
post May 30 2005, 09:59 AM
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QUOTE
Hey Neo, just curious...why not use the Audi trans?



Felix will be able to have a bolt-on solution for shifting, no real fabrication needed to get the shifter to work.....

The Audi tranny is more like a tailshifter/930 transmission, no bolt-on shift linkage
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Brett W
post May 30 2005, 10:11 AM
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http://www.lambolounge.com/Chassis/Transmi...udi-Shifter.asp

For all fabricators out there.
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neo914-6
post May 30 2005, 11:14 AM
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QUOTE
I'd still love to see somone convert a 914 with either the 986 S 3.2
Jason and Darren just picked up more parts for their conversions, stay tuned. (mybad, I "thought" the S was a 3.4)
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neo914-6
post May 30 2005, 11:21 AM
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QUOTE (Mueller @ May 30 2005, 07:59 AM)
QUOTE
Hey Neo, just curious...why not use the Audi trans?



Felix will be able to have a bolt-on solution for shifting, no real fabrication needed to get the shifter to work.....

The Audi tranny is more like a tailshifter/930 transmission, no bolt-on shift linkage

That is a less costly alternative and Sonu has most of the linkage designed to the Audi cable shifter (looks identical to the Porsche).

Like Mike said, I like that the Boxster tranny is already engineered for mid-engine...
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neo914-6
post May 30 2005, 11:26 AM
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QUOTE (ajracer @ May 30 2005, 06:09 AM)
Felix:

The Axle flanges on the tranny and my (911 axles) are the same size, which if I
remember is 100 mm. with 6 bolts 8mm.

That's odd, my axle flanges are smaller than the 911 CV's. (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif)

BTW, here's a tranny bracket from a guy who installed a Boxster 6 speed in his 914 (w/4cyl).


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