Olli is dead right. 951 and 951S has a stronger gearbox! You will eventually break yours with hard use - and you would not drive you car soft would you?

 

special tool speaks from experince.
all teh other who say it will break. Do you have FIRST Hand experince with this or you just thnk so? Did you saw one that it was broken because it was in a Turbo car?
I never heard of one that it was broken just the 944 s one but not the S2 one.
so who had one in a Turbo car and had problems with it?

please no gesses just first hand infos ONLY.
Konstantin

 

Yep - I have seen it first hand just last week in my mechnic's work-shop. Customer's car (944TS with an S2 gearbox) started to click in 3rd gear. As they removed the gearbox the 3rd gear's teeth were totaly worn at the top edge and differential gone. OK it hasn't shattered to bits but the gearbox needs a rebuild - $$$$! His car has 75K (20K with the S2 box) miles on the clock - my car has 154K with the original gearbox - no clicking yet - would say not a good idea to mix. (both cars chiped though - maybe standard 250hp would be OK?)

 

Konstantin, the ring and pinion has been in my 86 for approximately 10 years. (Know the previous owners mechanics). Have had no problems at all except losing 15k top speed. Then again maybe I am easy on gearboxes as I have a 968 in the 90 model. The 86 has Guru chips, LBE & shims.

 

if I am not mistaken the 3rd gear is the same in both trannys??? S2 and 951.
it is only the 5th gear an dthe ring and pinion that are different

Konstantin

 

Was the 944S2 transmission available with an oil cooler? Can the cooler from the 951 tranny be fitted to the S2 tranny?
How can the S2 tranny be identified externally?
Thanks,
Gary

 

no oil cooler for the s2
the ID number on the top is different 016 is for the 951
You may fit an oil cooler in the S2 but you need a good shop.
it is possible but if it is worth?

Konstantin

 

I should have my S2 tranny installed shortly and can give feedback on how the gearing works with a larger turbo. I have a Garrett T04E on my '89, which dyno'd at 310rwhp.

I couldn't find a S2 tranny with both a LSD and cooler, so I opted for one with LSD only.

I was told by a somewhat reliable source that the ring/pinion in the S2 tranny is a 9:35, which is not as strong as the similar ratio 8:31 available from Porsche or the 8:27 that is stock in the Turbo tranny.

Any experience with Redline Shockproof gear oil in these transmissions?

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by GaryK:
<strong>I should have my S2 tranny installed shortly and can give feedback on how the gearing works with a larger turbo. I have a Garrett T04E on my '89, which dyno'd at 310rwhp.
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Please do give an update when you are finished, I for one am very interested to get your impressions on this combo. Especially since you're also at a higher elevation.

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica"><strong>
I was told by a somewhat reliable source that the ring/pinion in the S2 tranny is a 9:35, which is not as strong as the similar ratio 8:31 available from Porsche or the 8:27 that is stock in the Turbo tranny.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">According to the factory manuals, the S2 (083F trans) has the 8:31 ring and pinion while the S (083D trans) came with the 9:35 ring and pinion

Rob

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica"> According to the factory manuals, the S2 (083F trans) has the 8:31 ring and pinion while the S (083D trans) came with the 9:35 ring and pinion
</font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Well that's good news. Hopefully, there's no durability issue with this ring and pinion.

If I was at sea level rather than 5000+ feet, or the tracks around here weren't so tight, the shorter gearing probably wouldn't be necessary. I think the boost threshold is about 500-600 rpm higher here than at sea level, which is about the difference in the gearing. Really couldn't give a damn whether or not the car builds full boost in first gear.

I'll keep you posted ...

 

Finally installed the S2 tranny on my '89, which has a T04E, exhaust, chips, MAF and dyno'd at 300rwhp at 15 psi.
The car is much more tractable around town - much smoother off-the-line, quicker on boost, etc. As expected, 1st gear is too short too build full boost - get only 12psi - but 2nd is fine. And 5th is plenty tall.
Will do some track testing shortly, but so far I really like the gearing.