lbp
09-25-2009, 04:06 PM
Hello all,
I've been running an '89 Porsche 951 in PCA GT3 category, recently re-classified to GT2 (rule changes).
I'm considering moving, with an SBC conversion, to NASA's SU (Super Unlimited) class which allows just about any vehicle setup.
To be competitive there I would need a minimum of about 600+- up to 750hp with a total vehicle weight of around 2250lbs.
The vehicle weight is OK at 2250 as currently setup with a dry sumped 951 package.
Here are some questions for all Hybrid Guys, particularly if you run a competition-prepared 944/SBC (anyone out there?):
1. Any opinions as to a kit, which is suitable for track competition, to accommodate the LS-7 SBC?
2. Currently run a 6 spd LSD 968 transaxle (with cooling) which has been OK at 550hp.
- Will this transaxle be OK at 600 - 750hp?
- Where is the (HP/TQ)limitation on this setup?
- Also, how about the torque tube with regard to power capacity/reliability?
3. Currently run no power steering/no ABS (although looking into Bosche Motorsport ABS this winter) & floor mount AP pedal box which will be retained. SBC will be run without flywheel, i.e., starter ring on clutch.
- Will any existing kits accommodate this setup without (or with) modification?
5. Any weight comparison information on the 951 vs. LS-7? (both being dry sumped, not sure yet if I would run a FI or carbed unit).
6. Current setup includes Tarret F/R sway bars & Moton Club Sport/HR springs. Torsion tube is gone (rear section now boxed), transaxle (& engine) solid mounted, charlie arms, raised front perches, etc.
- Are there any fitment or structural stress/load considerations given the suspension setup/power requirements? (The car already has a highly engineered roll cage).
- Are there areas on the (1989) 944 tub (or other areas) that anyone would specifically recommend be looked at for further reinforced with consideration to the SBC conversion for competition use?
9. Would like to replace the aging GT Racing wide-body kit with something else. Tire sizes are F 305x18, R 315x18 (rear is tubbed). Any body kit recommendations with (this is important) good aero characteristics?
- Any other considerations?
- Anyone out there running a similar (or not) competition setup?
Many thanks for any and all response. - I was really pleased to discover this forum & hope it will be a source of information for this (potential) project.
I've been running an '89 Porsche 951 in PCA GT3 category, recently re-classified to GT2 (rule changes).
I'm considering moving, with an SBC conversion, to NASA's SU (Super Unlimited) class which allows just about any vehicle setup.
To be competitive there I would need a minimum of about 600+- up to 750hp with a total vehicle weight of around 2250lbs.
The vehicle weight is OK at 2250 as currently setup with a dry sumped 951 package.
Here are some questions for all Hybrid Guys, particularly if you run a competition-prepared 944/SBC (anyone out there?):
1. Any opinions as to a kit, which is suitable for track competition, to accommodate the LS-7 SBC?
2. Currently run a 6 spd LSD 968 transaxle (with cooling) which has been OK at 550hp.
- Will this transaxle be OK at 600 - 750hp?
- Where is the (HP/TQ)limitation on this setup?
- Also, how about the torque tube with regard to power capacity/reliability?
3. Currently run no power steering/no ABS (although looking into Bosche Motorsport ABS this winter) & floor mount AP pedal box which will be retained. SBC will be run without flywheel, i.e., starter ring on clutch.
- Will any existing kits accommodate this setup without (or with) modification?
5. Any weight comparison information on the 951 vs. LS-7? (both being dry sumped, not sure yet if I would run a FI or carbed unit).
6. Current setup includes Tarret F/R sway bars & Moton Club Sport/HR springs. Torsion tube is gone (rear section now boxed), transaxle (& engine) solid mounted, charlie arms, raised front perches, etc.
- Are there any fitment or structural stress/load considerations given the suspension setup/power requirements? (The car already has a highly engineered roll cage).
- Are there areas on the (1989) 944 tub (or other areas) that anyone would specifically recommend be looked at for further reinforced with consideration to the SBC conversion for competition use?
9. Would like to replace the aging GT Racing wide-body kit with something else. Tire sizes are F 305x18, R 315x18 (rear is tubbed). Any body kit recommendations with (this is important) good aero characteristics?
- Any other considerations?
- Anyone out there running a similar (or not) competition setup?
Many thanks for any and all response. - I was really pleased to discover this forum & hope it will be a source of information for this (potential) project.