Walbro fuel pump q's

[NyQuiL07]

IM gona be ordering a walbro fuel pump pretty soon, just had a few questions before i made my choice.
I was originally going to order the walbro 255, but then saw that theres a low pressure model and high pressure model. Ive heard that the 255lp can handle most things you would throw at it, so what does the hp provide/do? Also Im eventually shooting for 400whp, the largest turbo i might ever go to would probably be the to4b, but for now and a good amount of time to come ill be running either a ported 14b or small 16g, so should i order the 190 instead?
Also can i run either pump with the stock fpr, or is a aftermarket one immediatly needed after getting the pump?

thanks guys.

 

[SRiz]

yeah... i got a T25 at 17psi and i am going to get a fuel pump very very soon! anyone have an explination for the pump sizes... 190..255 ect i see most cars with 255 even on slightly modified should we just get 255 or will it be overkill and hurt our gas milage?

 

[Coup D E'Tat]

Re-wired 190's can take a car to 400whp.

Neither "need" an AFPR off the bat, but it is pretty much recommended for either.

I'd say 255, of either variety, but get an AFPR while you're at it.

190 = 190 liters per hour, 255 = 255 liters per hour, etc.

 

[steve]

Neither "need" an AFPR off the bat, but it is pretty much recommended for either.

Please define what you mean by "need"?
I fail to see how your helping this guy out by telling him it's ok to install a 255 l/h fuel pump without a AFPR to correct the pressure overrun that either the lp or hp versions of the 255 cause. Sure the car will run but it will have fuel metering problems.

I know you said it recommended but it's really a required supporting mod for these larger pumps.

Steve

 

[Coup D E'Tat]

It's like you said - the car will run, but not right. Technically, it isn't "needed." That's all I meant. I "recommended" it, because it really is the best choice.

Sorry for any confusion.

 

[NyQuiL07]

on a esitmated guess how long could i run a 14b with a 255 and no afpr? would it come down to how hard everything is going to be pushed?
can anyone recomend a decent adjustable bolton afpr for a 2g?

 

[Coup D E'Tat]

People have had good luck with Full Throttle Speed AFPR's. Bolt-on, ~150.

I have an Aeromotive and love it.

 

[guitarXgeek]

If you're just going to be running a ported 14b, the stock fuel pump (2g rewired) will suffice. Although the pump will be on it's edge, a good tune (not overly rich) will help tons. I'm running a rewired stock pump with my ported 14b and it's handling the 14b with no problems A 16g or larger, though, will definitely require a larger pump. Anything under ~45 lbs/min worth of airflow (the boost pressure at which you are flowing this amount of air will be a large factor as well) will be good for a 190lph.

 

[SRiz]

i have a T25 at 15psi im gonna rewire it soon... will a 190 help proformance at all with a T25 at 15psi because i was gonna get one eventually when i get my 16g... but if it helps proformance on stock parts ill get it now and do rewire... any help thanx!

 

[Maglin]

The 255 flows more fuel at lower pressure than the 255 HP. The 255HP is for those that are running big turbos at over 30+ PSI of boost. Cause if you have your base fuel pressure set at 43.5 PSI and once you go past 30 PSI of boost you are now pushing 73.5 PSI of fuel pressure and the regular 255 starts to not be able to handle the higher fuel demands at the pressure level. Most all pumps will pump less fluid at high pressures.

 

[TurboSpoolinIns]

I had a 255 low pressure in my car all it's life (because when I was buying a pump, I didn't know I'd make 600+ whp someday). It ran/idled fine, and as stated above, a fuel pressure regulator is not "needed". It finally maxed out when I made my 617 whp pull, so if you want to make more than that, an HP might take you a tad bit further. If you don't want more than that, don't worry about it. It was good enough for a safe ~580-600 whp though on my car. For flow rates of the HP and the low pressure and other common fuel pumps used in dsms, stock wired and rewired, go to RRE's site here:

http://www.roadraceengineering.com/fuelpumpflowrates.htm

Hope that helps.