915 Tranny Conversion Options Options

[Coloradocurt]

I've already done a good bit of searching and have yet to find what I'm looking for, so here goes-
Is there a good, comprehensive thread which explores/discusses the tradeoffs (functional performance, prices, availability) of the various options for converting a 915 tranny for adaptation to a 914-6 conversion project.
Thanks.

[larryM]

what everyone says above is on target -

> be less concerned about gross HP, than about torque when you try to peel rubber in 1st or launch at the AX; - i don't use ever 901 1st gear except to get up the hill & out of the driveway

- the 901 has a known weak input shaft when it comes to smoking the tires - which can be "fixed" with a $1200 shaft from a 904 (when yu can find one)
http://www.ebay.com/itm/Porsche-Genuine-90...R-/121057562374

when i upgraded to the torquey 3.2 from a 2.7RS, i bought the Bott kit since i already had a rebuilt 915 left over from an aborted 911 track-car project;
- it is all still on the shelf (maybe for someday, but highly unlikely, since i will never again race the car) - i figure it is just money in the bank at no interest

during the 3,2 upgrade project, i happened to meet a SNR fellow who'd raced a 914 with a V8 chevy in scca - with a 901 - he never had a failure over several seasons; said the 901 would easy handle 250hp & the Chevy torque; so given that my chipped 3.2 makes about 235, i decided to leave the 901 in there & see how it went - was a lot cheaper & easier to get it all installed & on the road

during my deliberations on installing the 915, a friend was doing a 914-3.6 conversion with a wevo kit 915 - a lot of custom work was involved including the shifter, muffler fit, hydraulic clutch, etc -

i have had a 901 sideshift conversion (which shifts tightly & beautifully) with a simple Weltmeister short-shift kit, a custom GPR shift rod & bronze bushings in my car since i started racing it the early '90s, and raced it for 10 yrs behind a 210hp 2.8 - had only one failure where it chewed up intermediate plate & ring gear at Thunderhill - and that was a previously used 901 from a donor junker 914 of unknown history (fwiw: the 901 i'm currently running is from a similar donor with only the 1st-Rev fix done to it)

for that reason - like some others above - i have 2 more known real good 901 sideshifters also in storage; so if i do go track-ing again (PCA DE planned for 2017) & break the 901, the fix will only cost me 2 days time

(that pair of 901s is only worth about 20% of the value of the 915/Bott parts on the shelf) - cheap insurance

some good tips on the 901 here: http://forums.pelicanparts.com/porsche-911...x-how-do-i.html

. and here is a hot-rod thread with a lot of good links & Rennsport Systems transaxles info: http://www.fiero.nl/forum/Archives/Archive...9-2-086306.html

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