trans

The trans was the hardest part of the whole conversion. Mechanically it was easy but figuring out what all of the options were took some time.

I started out with what I did know :

915's don't shift well - I have owned a number of them

915's are weak - I have killed a few

915's gear ratios are all wrong for V8's

So It was going to be a 930 or Pantera trans - I decided on 930

Next Question : Long or Short?

Well at first it was going to be short and this would fit within the dimensions of the 911 engine / trans bay but.... I got kind of out of control with the engine build and exceeded the streatable clutches that would fit in the short bell housing.

If I wanted to go with a non-slip able racing clutch I could have used the short bell housing but I wanted to drive this car on the street and not fear hills and intersections. So it looks like I needed the room for the long bell housing (+ 1.200" longer).

This leads up to what clutch to use ?

I did a lot of asking in the high power world and everyone came back with Tilton for street / track / drag if you are close to 1000ftlb.

I spent about an hour on the phone with Tilton tech and they came to the conclusion that I needed a Triple Plate Carbon/Carbon for up to 1450ftlb and good street manors.

This is a $3500 clutch and it is a push type clutch so the Porsche throw out bearing release arm would not work (pull type).

This meant that I would also need a hydraulic throw out bearing to go inside the trans and a corresponding hydraulic clutch pedal in the drivers foot well.

Also there would need to be a custom flywheel made because the Tilton clutch pack required a special groove for the disk cage to ride in.

Hmmmm. Well the good news is it is easily rebuildable by just replacing disks and it is probably the last clutch I will ever need..

O' and now the engine and trans will no longer fit in the provided room - there is a solution to that thanks to my friends who are 935 owners..

So - Long Bellhousing 930, Tilton Triple Carbon/Carbon, Tilton Hydraulic Throwout... What next???

Trans Goodies:

Add spray bars on all four gears and the ring and pinion - this enables you to run a Tilton external oil pump 2GPM @ 50PSI through an Permacool aluminum external oil cooler and spray cool oil on the highest friction surfaces in the trans = MUCH LONGER LIFE of trans - About $700

Add Limited Slip or Torque Biasing Diff - After speaking with Paul Gaurd a number of times and receiving his info pack by mail, I decided on the GT LSD set at 40% - 60%. The LSD also locks up on deceleration and for what I am doing makes a big difference - About $1700

Billet Side Cover: This is a custom side cover that is stronger and provides more support for the diff and bearings, also made by Paul - About $400

930 Short Shifter + complete assemble = Ebay $100

930 Trans mount ( like new ) = Ebay $45

I will also need some small things like ARP bolts, Swepco 212HD, etc..

I called around to some of the bigger racing groups that I deal with and asked who builds trannys and who builds junk - I got very few good references.. but of those few I did contact I received detailed quotes that seemed to be all over the place on the price range.

Some of the listed charges were almost comical but luckily this is not the first 930 I have bought, nor is it the first I have built so I have a good idea for what is fair.

QUOTE #1 : PATRIC MOTORSPORTS 5/12/04