cheapest way to tune ka-t that reliable

[Mikel]

LOTS of factory turbo applications use an "FMU". In fact, I would suggest it for any car with a turbo, but I wouldn't suggest it alone. IMO you at least need to be able to raise fuel pressure 1psi for every 1psi of manifold pressure.

[orion::S14]

Originally Posted by Mikel

LOTS of factory turbo applications use an "FMU". In fact, I would suggest it for any car with a turbo, but I wouldn't suggest it alone. IMO you at least need to be able to raise fuel pressure 1psi for every 1psi of manifold pressure.

Yeah, the S13/S14 come with a factory FPR with a 1:1 ratio...but that's not typically called an "FMU". (And as you said, they are a MUST for turbocharged cars, to keep the pressure differential across the injector tip constant...).

But I know of NO factory turbocharged apps that use a higher rate (2:1, 6:1, 8:1, whatever), which begins the realm of "FMU" or "RRFPR"...

- Brian