Rising rate FPR. Worth it or not?

[blocke]

Anyone using a rising rate FPR like the one BavAuto sells?
Their site claims:

"Get more power and better throttle response from your BMW. This adjustable rising rate fuel pressure regulator enriches the fuel mixture as you accelerate to increase power and improve mid-range throttle response. Maintains stock fuel mixtures at idle. "

On a mostly stock M20, would this even make any difference?

Is there a better one out there, rising rate or adjustable?

[SpecM]

stock 3.0 bar is fine for mostly stock m20

even a warmed over m20 (like chip + exhaust) don't run lean at high load/rpm places, and if they do you need to clean your injectors

[nando]

RRFPRs in general are a bad idea, especially on an otherwise stock engine. 3 bars is fine, if you want more pressure a static adjustable FRP would be better. At least the computer can compensate for a static .5bar bump in pressure, but not a chance with varying pressure.

[blocke]

Thats what I thought. Wouldnt the computer constantly be adjusting the A/F ratio to try and keep up with the fluctuating FPR?
So youre saying that IF you had to get an aftermarket FPR, one with set adjustments would be better. Would the computer adjust to it over time, or still always be trying to compensate?

[Sagaris]

What is the stock FPR? 2.5 Bar? 3.0 Bar?

[nando]

3 bar on a 325i, 2.5 bar on a 325e

the computer will adjust to it over time, but you can't really get too crazy with it. .5 bar would probably be ok. but why do you want to increase FP? if your engine is stock, you should be getting enough fuel.

[blocke]

It's fairly stock. M50 injectors, miller MAF conversion and a K&N intake with heat-shield. Headers and exhaust are on their way..so I was just looking into the FPR option as I was browsing Bavauto.

Dont really think I need it, which is why the started the post, to ask the question if its worth it.

I think I'd rather save the $200 towards goin S50 :nice:

3 bar on a 325i, 2.5 bar on a 325e

the computer will adjust to it over time, but you can't really get too crazy with it. .5 bar would probably be ok. but why do you want to increase FP? if your engine is stock, you should be getting enough fuel.

[E30QC]

I just wanted to know if this would be a valid option against doing a tank / pump swap on an eta if i was going to go b25 head on it, with injectors, ecu, maf, etc..

[nando]

not really, the tank/pump doesn't really have anything to do with the pressure the engine is intended to run at.

[felix]

The O2 sensor only has a limited adjustment range - the FPR should be matched to the tune of the ECU. A rising rate fuel pressure regulator installed on its own is a waste of money to buy and a waste of fuel to use.