HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Actual experience breaking an n/a transmission?

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Actual experience breaking an n/a transmission?

Post by lsporsche on Mon Apr 11, 2016 10:03 am

I'm curious if anyone has actually grenaded an n/a transaxle. I keep seeing people push for turbo transmissions, but haven't read anything about someone actually breaking a non turbo one. If anyone has, do you mind posting and listing what your engine mods are/were? I need a new transmission due to not staying in 3rd gear (issue before the swap) and don't know if spending the extra for a turbo tranny and then having to swap in an n/a 5th gear is necessary

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Re: Actual experience breaking an n/a transmission?

Post by matt889 on Mon Apr 11, 2016 11:07 am

Following for feedback on thèse trannys

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Re: Actual experience breaking an n/a transmission?

Post by FrostedFlakeJake on Mon Apr 11, 2016 12:08 pm

I know you didn't ask for it but just to provide you with some data. My turbo trans was $533 delivered and as long as you are careful during the 5th gear swap ( i was not) you can make ~$150-$200 on the 5th gear trade. Bringing down your total cost into the $300's

If you have a late car with the speedo sensor in the trans make sure you keep your old one or pay attention if the new trans comes with it. They are around $60 so it's worth noting at least.

I almost bought a clean turbo trans for $300 on pelican just to do the gear swap and sell it back for profit, but decided against it. So deals are out there.

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Re: Actual experience breaking an n/a transmission?

Post by sharkey on Tue Apr 12, 2016 2:03 am

im curious on this as well. and for those that have broken the n/a transmission id like to know what they are doing with the car (street, road race, etc), and what the trans id was.

i just put my car on the road and im starting to look for a spare trans. right now my car has a 5s and what i have read puts me on edge a bit. id love an aor but i cant seem to find one.


sharkey

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Re: Actual experience breaking an n/a transmission?

Post by scryfst on Tue Apr 12, 2016 8:56 am

I have. model year '88 5R coded trans. if memory serves.

The pinion gear gave up it's teeth.

How? Spirited driving on the street. Shift from 1st to 2nd during left turn. Drive wheel loaded, CV axle was new, so the pinion decided to give up. I had an issue with CV axles until moving to a solid mount for the trans. (highly recommended)

The car put down 390hp at the wheel and was rolling on street 245's in the rear.

I made the move to an AOR code. The car was then used for AutoX only. The AOR has stood up to the abuse of the TQ coupled with 335's in Hoosier A6 comp.

Based on my experience, an open diff. n/a trans is fine for intelligent drivers on the street with non-modified swaps. If you are racing, get the AOR or at very least a LSD Turbo trans.

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Re: Actual experience breaking an n/a transmission?

Post by racertomtom on Tue Apr 12, 2016 10:57 pm

I think the bulk of the n\a failures are in the differential and not the gearbox. That’s because the 3.88 gear set has a tiny pinion that gets pushed away from the ring gear and it can’t handle a lot of abuse. The 3.37 is a stronger gear set/pinion.

racertomtom

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Re: Actual experience breaking an n/a transmission?

Post by murrayg on Tue Apr 12, 2016 11:48 pm

What about the S2 transaxles? Are they better than the na gearbox, but not as good as a turbo?? How close are they?

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Re: Actual experience breaking an n/a transmission?

Post by sharkey on Wed Apr 13, 2016 12:57 am

im also curious about the s2 transmissions. i read they are similar to the turbo trans, the only difference is the final drive ratio. i see its also a different final; drive from the older n/a transmission

sharkey

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Re: Actual experience breaking an n/a transmission?

Post by superman22x on Wed Apr 13, 2016 7:52 am

From what I've heard, the NA gearbox struggles with the stock engine even. At least the ring and pinion does. My coworker blew his up with the NA 2.5L during autocross.

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Re: Actual experience breaking an n/a transmission?

Post by racertomtom on Thu Apr 14, 2016 6:53 pm

The 944S, 944S2 and turbo are all more or less the same trans with the exception of the AOR which has a few more mods. All have a larger pinion bearing than the n/a. There is some conflict as to which ring and pinion is in the 944S, 3.88 or 3.875 (3.88 is the one that is failing in the n\a). The S2 has 3.875 and turbo 3.375. Whoever “they” are, say the 3.875 is as strong as the 3.375. All I know is a V8 doesn’t really need a 3.88 rear end ratio with a stupid low 1st gear ratio.

I guess it depends on what you can find and what you are willing to pay. My 88 944S has a LSD and I have gathered the parts to install a 3.375 gear, tall n/a fifth and a reinforcing plate. I will replace the friction discs in the LSD, look at the synchronizers and call it a day. This is more economical for me than buying an AOR and rebuilding the LSD.

Some light reading? http://garage.ideola.com/downloads/G31-Transaxles-PeteTinucci.pdf

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Re: Actual experience breaking an n/a transmission?

Post by Arthropraxis on Fri Apr 15, 2016 10:08 pm

My turbo LSD transaxle broke during a DWI, Driving While Idiot. 70's tech transaxles don't like high torque speed shifts like a straight cut jerico. Don't be an idiot.
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Re: Actual experience breaking an n/a transmission?

Post by Sterling Doc on Fri Apr 15, 2016 11:04 pm

I broke two teeth of a a pinion doing a standing start in a race in a 140HP 944 Spec car. No clutch dump just a 4,000RPM launch that did light up the rear tires a bit. It still ran, but was noisy, and handled like it had a spool back there - the fragments locked up the LSD!

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Re: Actual experience breaking an n/a transmission?

Post by phlip on Sat Apr 16, 2016 2:54 pm

Sterling Doc wrote:I broke two teeth of a a pinion doing a standing start in a race in a 140HP 944 Spec car. No clutch dump just a 4,000RPM launch that did light up the rear tires a bit. It still ran, but was noisy, and handled like it had a spool back there - the fragments locked up the LSD!

Was that from the standing starts we did at Hallett back in 2011?
Al really enjoyed bringing in gimmiks from CMC to 944 spec like standing atarts and
inverting the field from qualifying order.
I know the cars arent made for it but I kinda liked the standing starts.
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Re: Actual experience breaking an n/a transmission?

Post by Sterling Doc on Sat Apr 16, 2016 10:48 pm

Sort of. It was a pursuit race at Road America. We were release in reverse order bas on out best lap times, so in theory, we'd all cross the finish line at the same time if we ran at out pace. Some of my favorite races!

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Re: Actual experience breaking an n/a transmission?

Post by Hotrodz of Dallas on Mon Apr 18, 2016 9:52 pm

I broke 3 n/a trannys in my 944 turbo on the track. 3 liter with big turbo and lots of massaging made 400 whp. Also I was running on hoosier slicks. I always managed to strip the teeth off of the pinions. Always happened coming out of a tight second gear uphill turn at my local track. Never broke a turbo or S2 tranny.
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Re: Actual experience breaking an n/a transmission?

Post by haroldk on Fri Jun 23, 2017 11:41 am

I just took mine apart. On the last run of an autocross (3 drivers with 6 runs each basically hot-lapping because of the low entry count), it made a weird noise on the way back to paddock. I decided to trailer it home (the event was 90 miles away) and then I drove it 30 miles on side streets to where I work on it. On the drive to the shop, it didn't make any weird noises or vibrations.

We opened it up to find all the pinion teeth mostly stripped, the right side carrier bearing chowdered, the 5th driven gear missing half a tooth and the diff carrier itself broken at the weld all the way around. I have no idea what the sequence of events was. This is my 4th year autocrossing it with the 5.0 that puts out 220 hp/ 250 lb-ft at the wheels. The last 2 years have been on 245 RE71Rs. The trans itself is an 8Q. I have a 5P to put in, but I was really hoping to use the diff out of the 8Q when I finally blew it up. So much for that.
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Re: Actual experience breaking an n/a transmission?

Post by Jasonscottw on Fri Jun 23, 2017 3:59 pm

Yikes. This season I've been autocrossing a N/A tranny w/350hp and 275 nitto nt05's.
No probs yet, but I cross my fingers every time-
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