Join Date: Aug 2001
Location: San Diego
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how much better can a fuel return system be? what would the benefits be with an aftermarket system? It's just sending fuel back...right.
Teck, correct me if I'm wrong, but how much of a difference did you have to tune around going from a 40psi constant fuel pressure to a variable fuel pressure dependent on vacuum?
Hypothetically speaking I would think the injector pulse width time for one tune on the same engine but with 40psi constant fuel pressure would be slightly different than an ECU for the same engine that uses an FPR that uses a vacuum reference. IMO it would be simpler to tune from scratch (injector pulse width wise) with a car that has the vacuum FPR setup than a constant fuel pressure setup (were you would have to tune around 40psi at the injector squirting out more or less fuel dependent on what pressure is in the cylinder). So IMO the FPR does some of the tuning for you, but if using an OE ECU already tuned for 40psi constant, there must have been some tuning all around the spectrum to work with the variable of now introducing an FPR to the system. (and this would be why the TE S1 kits would need a one way valve so that their FPR could not see vacuum, but only boost).
If all this is true, I would have thought tuning with a piggy around the OE ECUs maps would have been tricky at the least with an FPR system. Was this a task you had to do or was it hardly a problem, did you install a one way valve or do I have it all wrong completely?
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