Turbo 408 or 427 EFI system

83gt50 said:

Hey guys I am new to this forum. I would like to know if a stock 92 gt computer could support a Turbo charged 408 or a 427 stroker motor. I have know clue how big of injectors I will need. I want to run 91 pump gas and have like 800rwhp. How can i get 8.0:1 or 8.5:1 compression, does any body sell pistons that will alow me to get those numbers. Can a Stock computer handle injectors that big. The reason I want to know is If not and I have to use like a FAST XFI system I will put it in my 83 gt, but if not I will put it into a 92 gt.

Thanks, Robert.

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Running boost on a 400+ ci engine will almost require a custom tune/chip.

If you were going n/a, then the stock A9* computer could do ok, depending on the setup. But a custom tune would be beneficial in this case as well.

Basically, you will want to get a custome tune or do some tuning yourself.

The factory computer will accept any size injector, but the tune will have to be correct.

Regardless, the combination of boost and large displacement will almost require a custom tune.
Look into the TwEECer, FAST, PMS, and Moates, if you are a do it yourselfer.

If not, take the car to a dyno and let some pros tune it out.

You can find forged dished pistons to run the CR easily enough, but it would be better to get some heads with larger chambers. The dished pistons leave a large gap between the top of the piston and the bottom of the head. This distance is called the Quench Height. If the Quench Height is over about .050", then detonation can occur at low rpm/high load. This is bad for a street car.
If the car will not be loaded below 3k rpm (a track only car) then you should be fine with large dished pistons.

jason

you are crazy to go out and buy the supporting pieces (eng, clutch, trans, rear end, turbo) and not a stand alone. For 1300 you can have your own unit these days. It would be the excel DFI ( ) . The new FAST system is great. All the Big stuff systems work. Find someone around you that tunes these cars, see what he is comfortable with and buy that system. These cars live and die by the tune.

If you go over to Turbomustangs.com there are guys running blow thru carbs but i have no idea how that crazy equipment works.....

Friend of mine is having nothing but trouble with his FAST system.

Stick with stock computer and run Tweecer

Blow thru MAF's are supposed to be better and allow for direct dump of BOV to
outside atmosphere.
You just have to have a min of 6" straight pipe before the meter so the air
hits the sensor smoothly.