RRFPR - advice please

[rich]

the guys at power engineering the other day identified a fuelling problem with my 1985 T16S. they reckoned the pump was on its way out and recommended its replacement with new filter. i will do this soon.

they also said that the RRFPR (a trent one, about 2 years old) was playing up - leaking fuel everso slightly, and ticking a lot (i wondered where the ticking was coming from..)

so what should i do :-??

i don't plan to tweak at the mo - i'm getting a nice 189 bhp on just this, fuel cut-off screwed right in, a JR air filter and a single box standard exhaust. they reckoned a standard FPR would be more reliable - but when the RRFPR was fitted at trent there was a noticeable improvement in pick up...

should i fork out on another RRFPR, should i get a standard T16s one (2.5 bar i think) or an LPT one (is this 3 bar?)

views appreciated...

rich 8)

[nickj633]

I did have a RRFPR on my 93 LPT, it had little or no effect on performance, so i put the 3 bar FPR back on. Interesting you mention the ticking, my whole fuel rail pulses with something going on. I thought it might be the RRFPR, but it still does it with the old FPR back on.
(175bhp by the way, slightly tweaked LPT)

Nick

[rich]

hey nick
is your used RRFPR for sale by the way?
rich

[Matthew]

Originally Posted by rich

they reckoned the pump was on its way out and recommended its replacement with new filter.

I will give the part number for my fuel pump soon Rich... been really busy since returning from PE!

Matthew

[rich]

ah firefox - i know who you are now :wink:

yeah, thanks - no immediate hurry on this BTW

rich

[Johann F]

A lot of people (including me) have had problems with the Malpassi (Trent) unit; it drifts out of tune when new and needs re-adjusting and the bolts can work loose and cause leaks. I did notice a positive improvement in throttle response and a smoothing out of power delivey over my stock 3 bar unit(lucas FI) and I wouldn't go back. For the early bosch LH system a cheap uograde would be a S/H 2.8 or 3.0 bar fixed unit but I do like the RRFPR's as they are adjustable. You can also buy fixed rate units (webber) which are adjustable.

[Matthew]

Quite a few people have found that the RRFPR's bolts become loose, resulting in fuel leakage. This can be prevented by purchasing longer bolts with nylok nuts. Screw the bolts all the way through the unit, fastening the nyloks onn the underside - you might need spacers on the bolts so that the nuts can fit. Alternatively, remove the existing bolts, thoroughly clean the threads and use some thread locking compound. Personally I'd use nyloks!

[Paco]

Isn't the FSE "Boost" Valve an RRFPR by any other name?

Are they any good?

[Matthew]

Originally Posted by Paco

Isn't the FSE "Boost" Valve an RRFPR by any other name? Are they any good?

Yup, they're one and the same. As to whether they're any good depends on whom you ask. Brad at George's Imports views them as a crude band-aid alternative to getting fuelling sorted properly. Others swear by them.

They're good for improving throttle response over the standard FPR, but if you have lean fuel issues then a RRFPR isn't really a properly solution - look at bigger injectors, fuel ECU upgrade (take others' advice here - I'm no expert).

Plenty of people run fixed 3bar FPRs and high-boost levels, so it seems that a RRFPR isn't mandatory if you're tweaking up boost levels.

If you get one, then be sure to fit a decent fuel pressure gauge. The Malpassi units drift alarmingly out of adjustment, and you'll need to check them regularly during the first three or four months of usage. HTH

[Johann F]

FSE = RRFPR = poweboost valve - all the same.
Are they any good? - with a properly setup (reprogramed/rechipped) FI ECU - i.e one that is mapped perfectly for the particular engine and takes into acount all your mods and your requirements for a sporty engine response - you would not need one. However if you want a quicker throttle response, a smoother power delivery and a bit more fuel when you put your foot down - they are the next best thing.

[Paco]

Cool, thanks

[mattfaulks]

I just run a fixed 3 bar FPR on mine. Even with the Apexi turned off it still does the job fine, just overfuels a bit at low RPM cause of the 30# injectors.

Matt

[rich]

thanks for all your help & advice guys. i think i'm gonna do this:

test the pump (as in bentleys) to see if ok - replace if not
replace fuel filter anyway
fit in line fuel guage
bolt down malpassi with nylocks
see how it goes.........

rich

[Matthew]

Rich,

Can't remember if you said you'd be at Kodak or not.....?

[rich]

firefox - no, sorry, won't be going to kodak...
rich

[Matthew]

Swapped the bolts on my RRFPR to longer bolts plus Nyloks the other evening - the existing bolts certainly weren't very tight! The unit hadn't been leaking fuel, but I reckon it wasn't far off!

Damn thing's bolted shut now... grrr no leaking fuel for me :wink:

[saabstar]

does any one know where i could find info on how to do the AMM mod(soldering in a 300ohm resistor in the output signal of the air mass meter) brad said to do this and use #30 injectors because as of right now i plan to put a volvo intercooler and then the check engin light came up and said i am running lean. did any one solder in a resistor in the amm?

[87SPGIN]

So with an 87 turbo spg pushing reaching for power gains, I am going to put the red series injectors on the car. Does anyone have the Swed Dyn RRFPR, I was told that i need that in conjunction with the stock 2.5 bar reg. Is the 2.5 bar one necessary, is this to control idle fuel level? Should i even go with a RRFPR with these injectors or just throw like a 3.5 or 4.0 Bar FPR on it and say the heck with a rising rate one?

[Widde]

I'm going for a 3.0 Bar static FPR together with a custom LH 2.2 chip optimized for my Bosch -431 (395cc @ 3.9Bar) injectors. No resistor mod for me.
/Widde

[saabstar]

does any one have the resistor mod or does any one know how to do it and also how much do #30 injectors coast and where do i get them becasue i whant to but in a volvo intercooler do you think this set up is the best to cope with the all of the new found air with the intercooler?