How to determine optimum shift points?
Thread Starter
11 Second Truck Club
iTrader: (2)
Joined: Jan 2002
Posts: 1,412
Likes: 0
From: Missouri
Ok, I have installed the Precision 74GTS off my Blazer on this truck. I put a .96 housing on the 74mm (the 67mm had a .81) I am now running it at 10 psi vs 6ish with the smaller turbo. Going to the dyno tomorrow-anyone care to make a guess what it should make?
Thread Starter
11 Second Truck Club
iTrader: (2)
Joined: Jan 2002
Posts: 1,412
Likes: 0
From: Missouri
Well, it made 422 horsepower and 451 torque. Graph is even shakier now and it still nosedives way before it should. Dyno operator thinks the valvesprings are weak. I think its a combination of valvesprings, the "all terrain" tires, and the tune.
The next step is to put some 317 heads on to lower the compression a bit. I will do some good springs at that time. In the meantime I am planning on getting the tune in better shape....
The next step is to put some 317 heads on to lower the compression a bit. I will do some good springs at that time. In the meantime I am planning on getting the tune in better shape....
