Explanation about RRFPR

[stan1221]

So the question is, what is difference between RRFPR and FPR? only in an adjustability? and what it does?

[rob_e30]

A Raising Rate Fuel Pressure Regulator provides a variable amount of Fuel Pressure Regulation depending on the boost generated.  More boost equals higher fuel pressure.  A Fuel Pressure Regulator typically provides two levels of fuel pressure... one under vacuum and another under ambient pressure.

[bmwconnect]

a RRFPR is also a bad bad idea for boost

[rob_e30]

a RRFPR is also a bad bad idea for boost

It really depends on the ECU and how you plan to tune it.  I'm not a fan, but I'm not a fan of piggy back systems either.  Fully programmable with a MAP sensor is your best option, but has the most cost as well.

[bmwconnect]

It really depends on the ECU and how you plan to tune it.  I'm not a fan, but I'm not a fan of piggy back systems either.  Fully programmable with a MAP sensor is your best option, but has the most cost as well.

fuel pump replacements and leaks are no fun

[nuvolarossa]

DASC uses RRFPR. RRFPR is really the minimum.
It's a band aid...
I used it too with custom S/C first time, before PCIII (not recommended) and big injectors.

Well, RRFPR it gets you in the "ballpark" AFR, but:
-poor transitions off-in throttle in a s/c, go figure with turbo. Afr lean spikes here.
- compromises: more fuel here, less fuel there... you can't fine tune.
- find a friend mechanic before, just in case boost spikes over the max pressure of fuel you can have
- high pressure = SUPER attention. You will get 75-90psi of fuel pressure for low boost. That's high. Stock fuel lines aren't engineered for that. You'll need NEW hi-press fuel hoses.
-don't use shitty worm clamps on fuel lines when fitting RRFPR, or you'll figure it hard way.

Sure it could works on low boost. Mandatory Wideband o2 meter and constant check of afr gauge. You'll know the sound of detonation.

If you do half asses jobs and don't care to return home by foot everything COULD work. :p

Put an extinguisher in car, fuel leaks are not a joke. :rolleyes: and have some money to fix damages if your not expert You'll have to "wrench" every week to keep half asses cars together.

Otherwise wait for some more money and from now read everything you can read about fuel tuning/piggybacks/standalones/megasquirt & similars.
Engine Fuel & Ign Tuning is what keep your engine together, excluding mechanical stress.

[bmwconnect]

DASC uses RRFPR. RRFPR is really the minimum.
It's a band aid...
I used it too with custom S/C first time, before PCIII (not recommended) and big injectors.

Well, RRFPR it gets you in the "ballpark" AFR, but:
-poor transitions off-in throttle in a s/c, go figure with turbo. Afr lean spikes here.
- compromises: more fuel here, less fuel there... you can't fine tune.
- find a friend mechanic before, just in case boost spikes over the max pressure of fuel you can have
- high pressure = SUPER attention. You will get 75-90psi of fuel pressure for low boost. That's high. Stock fuel lines aren't engineered for that. You'll need NEW hi-press fuel hoses.
-don't use shitty worm clamps on fuel lines when fitting RRFPR, or you'll figure it hard way.

Sure it could works on low boost. Mandatory Wideband o2 meter and constant check of afr gauge. You'll know the sound of detonation.

Otherwise wait for some more money and from now read everything you can read about fuel tuning/piggybacks/standalones/megasquirt & similars.
Engine Fuel & Ign Tuning is what keep your engine together, excluding mechanical stress.

exactly what needed to be said