[forensicsteve]

We've had two turbos on this car, first a 67mm...then the present 76mm... and planning on a much larger one The PH turbos produce more torque than horsepower which seems to be typical of a turbo setup.

The 67mm is a good size for a street car. With turbos, you have to size the thing for your specific application. I would not want a 76 on the car if it was still a street car. We were running 22 lbs of boost and the car hit 10 flat at 136 running like krap, shortly before built motor blew. Whole car is being rebuilt and I think we're going for 25+ lbs boost.

One advantage is that you can set different levels of boost at a turn of a switch. I will race the car at the lowest setting, while Lance will go for the gold at the highest setting.

As far as spooling up, sized correctly that is not an issue and I think the PH 67mm is good for about 650 rear wheel.

 

[forensicsteve]

This is a short vid showing a few launches off the transbrake. Setup correctly there is zero lag.

The car was pretty much street/strip at the beginning off the vid, running 10-12 lbs of boost on the 67mm. Middle of vid car is at 16 lbs of boost. Last few launches, car is at 22 lbs of boost on the 76mm and racing against some strip only vehicles.

Now car is being rebuilt and is really not streetable with 2 speed tranny and full spool.

video :: transbrake 11 to 22 lbs boost video by forensicsteve - Photobucket

 

[forensicsteve]

This is not supporting which gear is better, just reporting what we used on the car that had very little street use with last build and now none. Also, car was launching with t-brake and 2 step, on a 4r70w (sold to and enjoyed by 05mustang_kb_charged)

We had 4:10s on our turbo car, only because they were installed when car had a Procharger and hungry for rpms. Over time as trap speed increased, we had to go to a larger and larger tire diameter to offset the 4:10s (running out of rpms). On this present build, car has 3:50s.