Fuel pressure regulator
 

Last engine mod I need. Uprated fuel pressure regulator. For sti 2002. Going to be running 650cc injectors and walbro fuel pump.

Currently top of my list is a race version on the temple tuning site. £98.

Got an sx reg here £95 delivered

Anymore details? Will look up when home

whats you mods mate

im running md321t / headers/ full decat / fmic / lateral modded injectors / avcr (im not running a fpr)

more important question is - what are you expecting your injector duty cycle to be running at on 650's

mines running 73% on lateral modded 858's

my meth map might push that upto 85 - 90 % but still not maxxing them out

if your going 20g etc i wouldnt worry about it

hope this helps :thumb:

steve

I was starting to think that I might have under specced the injectors. And added benefit is larger one don't need fpr.

Mods are
Injectors 660
Fmic
255 fuel pump
Induction
Decat
Turbo

hi mate few questions first

what turbo are you going for?
is it a newage STI (with avcs)?

you might want to think about an apexi avcr & clutch / flywheel upgrade

also if goiin over 400 tubular headers with harveys special uppipe (better spool of turbo) heat wrapped

under 400 ported sti headers (harvey does this in exchange)

650's would be fine if your going 20g / md321h

i believe dunx maxed his pinks out on an md321h

if going bigger i.e md321t i would seriously consider lateral modded 858's

they do an exchage process (buy marks modded injectors with discount if you give him your old ones back)

then you are quite safe if you ever want to turn up the power (then you might want to think about an fpr (i.e > 475 bhp)

some people might say different but this is what ive done and my injectors are sitting at 70 ish % (nowhere near max)

hope this helps

steve

Hi mate

Thanks for the info.

Not quite decided on the turbo yet. Probably a T equivalent
Yes newage sti.
Clutch/flywheel upgrade is on the list.

Had not thought of headers... What do they give, just the spool?

hi mate

the headers are a requirement as the standard (even ported cannot cope with over 400 bhp)

do a search on which ones would be best

harvey does them gt spec 2 (his custom fabbed uppipe give earlier spool)

but the tubular headers are to do with power and heat etc

steve

Will do some reading on that this evening! Sounding like more for the list!!

yeah mate a hell of a lot more

ill pm you a list of what ive had to do

steve

Unless you need to extend the range of your injectors, chances are you don't need a fuel pressure regulator so you can save money.

hmmm... was told I needed to with those injectors, might be wrong, but thats what I thought.

650cc injectors probably cost the same as 800cc injectors or whatever so getting the right injectors for 450 bhp and you can avoid the cost of an FPR. However, from first hand experience we know that 650cc injectors can max out an MD321T on a particular installation we did recently.
Looking at it another way, with a quality FPR there won't be any doubt that a set of 650cc can run the MD321 power level regardless so it could be an insurance policy.

Sticking with the 660 injectors I have so FPR is still on my list