901 transmission temperture Options

[rascobo]

Does anyone know the optimum operating temperature range of the 901, and/or the the temp. at which accelerated wear becomes an issue?

[rascobo]

Having the exhaust coated is definitely on the to-do list. I'm convinced excessive ambient engine compartment temps. are a major bane of conversions, shortening the life of; alternators, starters, batteries etc. I've fab'd heat shields, but aren't convinced of their efficacy.

Which brings up another question that perhaps should be asked in a new topic (if so, tell me).

Any improvements over the 75-90w originally called for? Broader Ranges? Synthetics? Additives?

[ArtechnikA]

Which brings up another question that perhaps should be asked in a new topic (if so, tell me).

Actually it's a question that has already been asked lots of times in other topics ( Search is your friend, hint hint...)

Any improvements over the 75-90w originally called for? Broader Ranges? Synthetics? Additives?

for 901/915 Swepco 201 in 75W90 remains The Hot Setup. I have been known to use 203 but this is controversial, so I mention it but won't go on record as recommending it. Porsche ( i.e. 901/915 ) synchros need friction to work right - but 203 -is- recommended for boxes with ZF LSD's so I think it's not enough MoS2 to matter. (And the boxes I used it in -already- had bad synchros so I really didn't feel too bad about it. It didn't make them worse and I felt better about reducing R&P friction.)

Mobil-1 and its ilk are great for transmissions that specify a GL-5 -- but the 901 predates that stuff. You will find people who use and recommend Mobil-1 and Redline so ultimately you get to make your own choice...