Fuel Pressure Reg essential for VAFC2 tuning?

[Coupe-R]

When tuning a vafc2 will more power be obtained from usuing a FPR and then taking fuel out

I heard its hard to add fuel with a VAFC2

Anyone have any good power increase experiences using a VAFC2 without using a FPR?
P.S this is on a Type R (which runs a higher pressure than b16a2 etc)
runs about 50psi WOT compared to 42PSI

[EVLTEK FBI AKL]

what mods do you have??

i am still running completley standard fuel system in my car with plenty of margin to add more fuel and not need any upgrades....

I would think the VAFC will do nicely for what you need it.

[tarmac-]

if you add fuel, your retarding your timing, so it could be of use in this case by way of upping the pressure and not needing to use the vafc as much to compensate.

subtracting fuel advances timing so only time youll need it is if you wanna drop the pressure abit to keep the timing similar to what it was without subtracting a whole lot on the vafc.

it could be of use depending on your setup, but the vafc itself will be fine alone if its a near stock setup.

[Genkei]

we had a problem with injector maxed out


even doh it was turnd up all the way to the top



it didnt make a difference, check engine came out doh haha

[Coupe-R]

98 headers 2.5 mandrel exhaust with tanabe muffler, intake thats about it
so stock really

just wanted to know before i dyno if better numbers/curve could be obtained from a FPR and VAFC2

VAFC2 i have read is good at subtracting fuel but not adding it because of limitations of stock FPR etc. however i feel a near stock setup won't need much fuel adding and most tuning Im guessing will take fuel away on my setup.

correct

[EVLTEK FBI AKL]

yeah I would doubt much fuel will be added.....

[Coupe-R]

sweet ill see what we get out of it, should be able to do most tuning in only a few runs. Pretty simple these things 8) ill be pissed off if it isn't putting out 130-140WKW

[Genkei]

good luck

[Bl4ckt0p]

Sorry to hijack the thread but I have some h22a injectors (not installed) and have been offered a fpr for a cheap price but i have done some research to find that the standard b16a injectors are better than the h22a ones and from this thread it seems that a fpr doesnt make much difference. Is this true?If so I will sell the h22a injectors and get something that is more worth while.

[Horny_Devil]

Originally Posted by Bl4ckt0p

Sorry to hijack the thread but I have some h22a injectors (not installed) and have been offered a fpr for a cheap price but i have done some research to find that the standard b16a injectors are better than the h22a ones and from this thread it seems that a fpr doesnt make much difference. Is this true?If so I will sell the h22a injectors and get something that is more worth while.

FPR does make a difference but it depends on the setup. it menas u can get more fuel for each duty cycle of the injectors. if ur car isnt heavly modded then all ull end up doing is making it run rich thats y u need something, like a vafc to remove fuel as needed

[Bl4ckt0p]

Originally Posted by Horny_Devil

if ur car isnt heavly modded then all ull end up doing is making it run rich thats y u need something, like a vafc to remove fuel as needed

Ive got i/h/e, re ground cams, adj cam gears, 62mm tb and h22a injectors to go into my car.Im planning on getting a Gizzmo chip installed/tuned which should sort out the fuel. With only those mods should I get FPR?And will the standard injectors have better flow once I get it tuned?Or should I put the h22a ones in?

[Horny_Devil]

stay with the stock injectors they will be fine. and yes a FPR for u would be good

[tarmac-]

Originally Posted by Bl4ckt0p

Ive got i/h/e, re ground cams, adj cam gears, 62mm tb and h22a injectors to go into my car.Im planning on getting a Gizzmo chip installed/tuned which should sort out the fuel. With only those mods should I get FPR?And will the standard injectors have better flow once I get it tuned?Or should I put the h22a ones in?

IF YOUR GUNA SPEND THE CASH ON GETIN IT TUNED WITH THOSE MODS, THE STOCK FPR WILL BE FINE. HOWEVER IF YOU CANT GET ENOUGH FUEL, WHICH I DOUBT WILL BE THE CASE, A FPR WOULD HELP BY INCREASING THE PRESSURE IN THE RAIL= MORE FUEL PER CYCLE WITHOUT THE NEED OF BIGGER INJECTORS; THEN TUNE FOR THAT.