View Single Post
gavinc69 gavinc69 is offline
Registered User
gavinc69's Avatar
Join Date: Jul 2008
Location: Bournemouth UK
Posts: 1,012
Rebuild of 915....recommended upgrades

Winters nearly here and its time for another project...gearbox!

The box has never been particularly great and is now slowly getting worse.
I've added a few small uprades along the way including Fidanza lightweight flywheel, Wevo PSJ, new shifter bush's and Wevo engine + trans mounts.

For a short while now I have been able to feel a slight vibration with clutch up or down and just recently if I give it full throttle as I pass around 80mph there is a vibration through the car. But its fine if I ease passed 80 on part throttle.
I would say it was possibly drive shafts and will check them out also but a few people have said possibly a clutch issue.

Its a 1980 SC and the engine has been turbocharged, so its maybe around 280 to 300hp at present. I don't envisage going much further with HP so as I've read over the years the 915 should be OK as long as I don't drag race from the lights, which is fine by me.
The box maybe getting worse now due to it being tired anyway plus its now got more HP/torque to handle. if the gearbox is rebuilt.

What upgrades would be recommend whilst its being done?
I have seen the Wevo bearing retainer plate and transmission side covers, they seem to help strengthen things up a bit.
Also what clutch would be recommended and lightweight flywheel?
I went for Fidanza mainly due to low cost but being Ally I wonder if now its a turbo it has warped or something causing the vibration!!

1980 SC Flatnose, Euro 3.0, LW Flywheel, 993 Cams, Port & Polish Heads, RS Cut Valves, Magnacor Leads, Boxster Brakes, WEVO Mounts, TRG Roll Bars, Rollcage, RSR rear fenders, WEVO Shifter, K27 7200 Turbo, OBX Headers, Tial Wastegate, Omex 710 ECU, 3.2 Intake, Full Bay Intercooler.....400HP
Old 09-30-2014, 01:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)