So i bought a v-1 s trim i'm going to run 8 to 10psi and a guy at a mustang shop said that if i run 42lb injectors that i don't need the fmu..Has anyone heard of doing this and is it ok to do...Also the guy said i can run 42lb injectors on a stock fuel rail has anyone ran bigger injectors then that on a stock fuel rail?
Just use the fmu setup.
It's works pefectly fine.
The ECU tune is over the top with little benefit.
Most pushrod experts would set your fox up with the Fmu, it's the newer guys work on prodomintely 96+ cars that like to do the tune. Don't forget there are shop owners out there that are also salemen, a tune with a chip is like $750 and up.
I don't disagree that it will run fine with the FMU set up, but an FMU will get you in the ballpark at best. Some will hit it closer than others, but if he want's optimum drivability, economy, emmisions and over all performance, and ECU tune with properly sized injectors is the ONLY way to go. I've seen half a dozen cars (pre-'96 included) pick up as much as 20hp on the dyno with the correct ECU tune, that promote the above listed qualities to boot.
What he's got to ask himself is, are all the above benefits worth the additional cash layout to him.
Either way, you're going to need that 255 fuel pump. I prefer the in-tank, but the in-line works also.
If you have a fuel pressure gauge and the t-rex pump fails can't you tell by looking at the fuel pressure gauge?
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