90Rexx

my tuner says i need a 1 to 1 fuel pressure regulator. what exactly is the difference between stock, and can someone show me examples of which ones are 1 to 1

boostedcivicsir

how much power do you plan on making? difference is, a 1:1 reg will increase 1 psi per pound of boost.

i cant remember if a stock honda reg will or not. if you have access to a hand held vac pump, you can put pressure to it and see if it increases.

any decent aftermarket fuel regulator will step up 1:1

hybrdthry911

a stock honda fuel pressure regulator is 1:1.

he might not tuned hondas a lot if hes telling you to get something aftermarket. they are right you need to use a 1:1 regulator but he should know that already.

dpetro1

yup, oem fpr is 1:1.

what is your setup and what are you tuning with?

90Rexx

tuning with S300

setup is GT30R in a gsr stock block.
walbro 255
id1000's

looking for 400 whp

dpetro1

stock fpr should work just fine. many people, including myself, have made 400whp with oem fpr.

maybe you can ask the tuner why he suggested an aftermarket fpr. only reason i can really think of would be to increase the base fuel pressure.

0dancing_ninja

Are they telling you to buy a regulator to bump fuel pressure? That would be the difference between stock and aftermarket.

90Rexx

i questioned whether or not i needed to buy a fuel pressure regulator, and he said i need a 1:1 regulator. thats as far as the conversation went.

dpetro1

well hopefully he was making the point that you dont need an FMU (rising rate regulator). but since you already have a 1:1 regulator then you should be all set

redflaredcrx90

you stock fuel system is good for at least 500 hp -fuel pump that you will have to change

0dancing_ninja

I just now say you are running ID's
The sheet that comes with the injectors has injector scaling that is based on fuel pressure. Increasing base pressure increases the hp capability on the ID's. I believe what he meant to say is you need an adjustable fuel pressure regulator that is 1:1. This way he can be sure that the scaling is dead perfect for the injectors assuring you the best idle, drive-ability, and linearity throughout the powerband.