My 1987 GN is a full-weight car with a mild build-up (see below). I'm currently running a TA-49 with a Precision .85 turbine housing. With my combo, this turbo spools like crazy - I can easily reach 0 psi at less than half throttle against the converter. Last time I checked, there was some play in the bearings, so I'm thinking it's time for a rebuild or replacement.
Best 1/4-mile on this combo was 11.42 @ 119, which I did with 100-octane unleaded. I was running about 25 psi and 23-deg. of timing on those passes. My goal would be to run a similar ET (don't have a cage), but a little more mph (would like to break the 120-mph barrier). At the same time, I would like to maintain as much of the streetability as I can.
My options, I'm thinking, would be as follows:
1. Rebuild the TA-49 - cheapest option, assuming no wheel damage.
2. TA60 - bigger compressor wheel than TA-49, but same exhaust wheel
3. TA51 - same compressor wheel as the TA49, but larger exhaust wheel
4. TA52 - bigger compressor wheel and exhaust wheel than TA-49
5. Something from the new technology (GT wheels, CEA, etc.) - most expensive option
Combo is below:
Air Intake: Tin-Man CAI, CAS-V2, Ported throttle body and plenum, Power Plate
Engine: Completely stock internals (heads are not ported, stock cam)
Fuel: 57-lb injectors, upgraded/hot-wired fuel pump
Exhaust: 3" THDP, test pipe, ATR 2.5" duals
Torque Converter: Mike Ridings lock-up unit, would guess about 2800 RPM stall at 0 psi (give or take a bit). Like I said, spooling the current TA-49 with Precision .85 exhaust housing is no problem at all.
If you propose something from the "new technology", I would appreciate if you can provide a compressor map. I like to look at the data rather than rely on blind faith.
Opinions?
Thanks,
Best 1/4-mile on this combo was 11.42 @ 119, which I did with 100-octane unleaded. I was running about 25 psi and 23-deg. of timing on those passes. My goal would be to run a similar ET (don't have a cage), but a little more mph (would like to break the 120-mph barrier). At the same time, I would like to maintain as much of the streetability as I can.
My options, I'm thinking, would be as follows:
1. Rebuild the TA-49 - cheapest option, assuming no wheel damage.
2. TA60 - bigger compressor wheel than TA-49, but same exhaust wheel
3. TA51 - same compressor wheel as the TA49, but larger exhaust wheel
4. TA52 - bigger compressor wheel and exhaust wheel than TA-49
5. Something from the new technology (GT wheels, CEA, etc.) - most expensive option
Combo is below:
Air Intake: Tin-Man CAI, CAS-V2, Ported throttle body and plenum, Power Plate
Engine: Completely stock internals (heads are not ported, stock cam)
Fuel: 57-lb injectors, upgraded/hot-wired fuel pump
Exhaust: 3" THDP, test pipe, ATR 2.5" duals
Torque Converter: Mike Ridings lock-up unit, would guess about 2800 RPM stall at 0 psi (give or take a bit). Like I said, spooling the current TA-49 with Precision .85 exhaust housing is no problem at all.
If you propose something from the "new technology", I would appreciate if you can provide a compressor map. I like to look at the data rather than rely on blind faith.
Opinions?
Thanks,