MasterPower GT45 rated at 1000FWHP by MasterPower

I have some results on running a GT45 turbo. I did not dyno the car. So you can use the MPH and E.T. to guestimate. I tuned the car myself. I will start by telling you about my set-up.

Car weight 3500
Engine 383
compression 8.5 to 1
Heads A.F.R. 190
Cam 530 lift 230-232dur. 114 plus 1.6 rockers
Transmission 4L80E
Rear gear 3.70
tire height 26"
Fuel injection Controlled by FAST
A/F ratio 11.5-11.8
Timing 23 degrees
Fuel 114
injectors 72lb.
Air to water intercooler




I started with a used wastegate and thought it might be bad...Maybe diaphram. Changed to a new TIAL 38.
Wastegate spring was 17psi with a manual controller plumbed to cut all boost off the lower port on the wastegate. 17psi spring + 14psi from turbo.

Boost comes in at around 3200-3400 rpm's. I could only get 15psi out of the turbo. I have made 6 runs and boost stayed at 14psi with one spike to 15psi. I did everything except use a block-off plate to get full boost. I ask Jose to do the math and it looks like with my cubic inches 15 psi is all it will make.

My best time is below

1/8 mile 6.60
MPH 103

I made two 1/4 mile runs in Bowling Green when I went to the Drag Week with 93 octane and 19 degrees timing.... But I had power brakes then so 1/8 mile times were off because not being able to hold the car at the line to make boost quicker.

1/8 7.04
1/4 10.97
mph 125

Looks to me about 630 fwhp... maybe a few more and 520 or so at the wheel.

I am changing turbos now to a percision T76 and will post the differences hopefully this weekend. They are both rated at the same HP. I will run same boost to get an idea of times and then hope I get more max. boost from this turbo.

 

That's a hell of a lot of gear for that short of tire. Isn't it?


There was a car on Turbomustangs with a GT45 that would run high 8's or low 9's. Maybe something else is wrong???

I have a GT45 sitting here and was hoping for more than that out of it.

Good luck.

Tim

 

I guess my question now is what would make people think this turbo would make 1000hp with a 68 wheel?? What does a T70 turbo make for HP. I assume it has a 70mm wheel. Sorta makes since to me now that I look at it. Jose did the math and said 15 psi max on my engine. Jose has the wheels now to make this turbo 1200hp now. Contact him about it.

 

Yes we have the new wheels, they will bring the unit up to 1200hp. For some reason MP did rate them at 1000hp, so cars have made close to that at the crank, but it all depends on efficiency and cubic inches guys. This has been gone over on this board many times.

The upgrade for the GT45 is $599. Includes wheel, machining, re-sleeving and balancing.

Jose