rrfpr vs afpr

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adz_sportif_turbo

Member +
mmm yea i thought that...just sey u wer running higher boost levels than standard...surley u could just wind the fuel pressure right up for max boost(on adjustable)...and just be running rich under lighter load conditions. so does the rrfpr fuel perfectly for all boost conditions...when not running a re-map??
 
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CMR

Member +
Yeah because the standard isnt adjustable if you want to run more than the max pressure of the stock FPR for more boost.
 
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adz_sportif_turbo

Member +
ahh rite dat makes sense!! but y wudnt u jus buy a normal ajustable fuel pressure regulator and jus wind it up to fuel for max boost?? would it still work?? would jus fuel badly under lighter load conditions??
 
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CMR

Member +
I dont understand what you mean by a normal adjustable fuel pressure reg. The SARD and FSE ones everyone has are the same as the stock reg, but you can adjust the flow rate.

The stock ecu cannot fuel above fuelcut even with a RRFPR, thats why the fuel pressure has to be set on a dyno for the boost you are running, you cannot just set it at 3.0 bar and hope for the best because the ecu cannot see the pressure any higher than stock.
 
adi271087

adi271087

Fresh Recruit
wel ye but y would u .????? rich (i mean mega) till on full boost. it would make less power and the power curve would be hhmmm wel nice word bad
 
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adz_sportif_turbo

Member +
CMR ur confusing me big style lol!! i jus meant the fse ones like u wer seyin...the non rising rate ones!! u sey the ECU cannot fuel above stock levels...but how can u wind up the pressure and it still fuels?? also u said that the stock ones were rising rate u just couldnt adjust them...then u said that ther are the same as the fse ones...jus non adjustable?!?! sorry jus dnt hav a clue wat ur seyin :S
 
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CMR

Member +
No I didnt, read what I put.

ALL fuel pressure reg's are rising rate.

The STOCK fuel pressure IS NOT adjustable above stock (max) pressure

People buy aftermarket ones so you can adjust the max fuel pressure to run more boost, but to determine exactly what pressure to set the regulator to you need to go on a dyno to get it setup.

I cant really say it any clearer.. look on wikipedia at fuel pressure regs or sommat if you still dont understand
 
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adz_sportif_turbo

Member +
ahhh i c wat u mean now!! all regulators are designed 2 keep a 1:1 ratio against intake manifold pressure...and an aftermarket fpr does this as it allows you to adjust it to match the higher boost levels!! if u didnt have this it wouldnt b able to hold the 1:1 ratio.
 
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Sii

Member +
So why do some people run RRFPR (1:7etc) and others a direct FPR (1:1).

There must be some benefit/downfall to each.

I assumed a 1:1 would be best, one fuel pressure off boost and one on.

Yet I see after reading a few threads that the standard one is a rising rate.

I was pointed towards 1:1 by the local rally tuning company.

Can we list why some people run one and some run the other?
 
davehart

davehart

Member +
Possibly because of the fact that some people like to run different boost pressures so a rising rate one would suit the two boost settings.

What CMR said is pretty clear and understandable in my view so I don’t know how your struggling to understand it.
 
S

Sii

Member +
davehart said:
Possibly because of the fact that some people like to run different boost pressures so a rising rate one would suit the two boost settings.

What CMR said is pretty clear and understandable in my view so I don’t know how your struggling to understand it.
Click to expand...

Some people? Everyone runs differing boost pressures, you car doesn't go from 0-1 bar in an instant, it increase as it goes up, so everyone has a slow or fast increase in boost.

I do understand what CMR said but my question is still this...

"why do some people run one and some people run another"

I know the yanks run RRFPR on the big V8's to help with the top end.

What I don't understand (derrr derrr derrr mmonngo mongo) is why some people choose one and others the opposite, it's not like one kills engines and the other makes you shit gold and piss stella.

It appears to be a very 50/50 split and I was just trying to find out/figure out why people choose what they choose.
 
durmz

durmz

Member +
Sii said:
Some people? Everyone runs differing boost pressures, you car doesn't go from 0-1 bar in an instant, it increase as it goes up, so everyone has a slow or fast increase in boost.

.
Click to expand...

no no no, he means some people have 2 boost settings, as in will run a bar in high boost, and 0.7 bar in low boost.
 
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