V8 conversion trans options. Options

[mein_tag]

i know you can use the 901, and an flopped 905. but has anyone used anything differently. moreover is it even possible to use anything else?
srry for the noobish thread but i got the day off and got thinking... (IMG:style_emoticons/default/beer3.gif)

[wbergtho]

I never thought I'd try a 901 behind a 500+ HP V-8 so I had a 915 built with a flipped ring & pinion and a tall 5th gear. As soon as I installed Michelin Pilot Sport tires on my car 2nd gear blew clean off the shaft. It was a sinking feeling to hear the metal clang down inside the box and the resulting $2,000+ to get it fixed. I then sold it fresh to another V-8 guy who only had 400HP and told him it should be fine at that power level. 500hp is just too much for the 2nd gear in a 915 box according to Bobby Hart at CA Motorsports. He would know because all he does is build porsche transaxles for a living down in Lake Havasu, AZ. He tried to talk me into a G50/50 turbo trans with a billet sideshifter kit he developed for that trans (also sold through Patrick Motorsports)....but I don't have the 13-14K needed for such a box. The 930 box he built me has a flipped ring & pinion and a shortened bell housing. He freshened everything up and it wound up costing me about $6,500 just for the trans. Another $1000+ for a clutch and custom flywheel & ring gear. I have tried almost every disc known to man and I'm back running the stock disc due to its soft and buttery takeoff & good manners. Apparently KEP is making a disc that is very similar to the stock sachs disc and has a marcel and continuous material around it's circumfrence. It will hold about 10-15% more TQ than a stock disc. The 4 or 6 puck racing style discs clatter like a paint shaker and work like shit on the street. I'm now planning on a 100HP shot of nitrous so I will have to upgrade my pressure plate to a stage 2 (Kennedy). My box is cable shifted and if done properly, you will like the results better than a mechanical linkage. Just my 2 cents from a guy who has blown up a few thousand dollars worth of "stuff". Tim is right when he says a 930 box can handle 750HP and has great gearing for a healthy V-8. I found that my 1/4 mile times at the track are well over .5-.75 seconds faster because I'm not shifting like a monkey in a Mercury space capsule. You'll find the 4 speed to offer plenty of top end speed. If I can get my car to 7000RPM in 4th it will do 197MPH. However, I think drag will come into play sometime before that happens as the 914 Sheridan body work is rather wide and probably creates a bit of drag above 160 MPH. Anyway, it is my opinion that a 930 box is the best box for the money. If you have 14-16K laying around there are better choices.

Bill