Is there a rising-rate FPR available?

[wild man]

I am considering a 3bar FPR, but it will make the car consume excess fuel, even when it is not needed. What I would strongly prefer is a rising-rate FPR with adjustable "offset" (the point at which the "rate" starts rising beyond linear, or 1:1). I have seen them for other turbo cars (such as the t-bird turbocoupe), but not for the cars in this forum. Does any1 know if they exist, and who makes them & who sells them?

[ArthurPE]

why would it use more gas?

[wild man]

Originally Posted by ArthurPE

why would it use more gas?

Anytime the engine is running open-loop (like during warmup), where the O2 sensor cannot compensate for the increase in pressure, there will be an increase in flow, at any given pulse width. The only way for it to not use more fuel would be to write new fuel maps that are tailored to the higher pressure.

[ArthurPE]

Originally Posted by wild man

Anytime the engine is running open-loop (like during warmup), where the O2 sensor cannot compensate for the increase in pressure, there will be an increase in flow, at any given pulse width. The only way for it to not use more fuel would be to write new fuel maps that are tailored to the higher pressure.

thanks...I hadn't considered the scenario with the lambda loop not controlling...
during warm-up, and full throttle?


http://www.custom-car.us/efi/fuel-pressure.aspx

[wild man]

[QUOTE=ArthurPE;4865861]thanks...I hadn't considered the scenario with the lambda loop not controlling...
during warm-up, and full throttle?

Yes, also at full throttle, but that's when you want it to use more fuel! That's, ideally, the ONLY time you want it to use more fuel.