Dont know why, and dont know where but i've heard that I should go with the 190lph instead.

Thing is, I just found the 255lph HP for $98 shipped overnight. Now I really want to have the pump in for next weekend, so that might be my only option for the price.

I dont have any fuel mods done the the car yet, and I am running 16-17lbs. of boost on my AGPT28. Will the 255lph HP be too much? Should I wait and get the 190, or will I be ok?

(ps- I do plan on getting the sAFC and 550s within a month or two, but i need a pump now!).

Thanks in advance

most likely your stock fpr will be overrun. It can't flow enough fuel at idle at stock base pressure level. your base pressure will rise accordingly (the fuel will be forced through) and will be hard on the pump.

I am in this same situation, I want to buy the big t28 and just a fuel pump for now, save money and buy more mods later. I would love to know if there is a fuel pump that will work from 15psi and a basically stock fuel system minus the re-wire, to around 20psi with new injectors and some sort of management system. If there is not, should we be using the 255 with just a fpr? Would that solve the problem?

Thanks,
Greg

I am going to be using the 190lph to 23 psi (with either 100+ octane or water injection) with the stevetek upgrade from the filter location to the fuel rail.

Buy the regular 255lph pump (not the hi flow unit) and you will be fine. I ran one on my stock 2G FPR before I replaced it with the cosmo pump and didnt have any problems. It was a little rich at idle but gas mileage didnt suffer and I had no problems with tuning.

jeff

Isnt the only diffrence between the 255 hp and regualr is that the high pressure one flows better at high boost? But they are both still flowing 255 liters an hour. Why would the high pressure one overun the fpr and the regular one not?

I have the HP 255. The main reason people say to use the 190 is because it is cheaper and you can do the rewire. I am running my 255 hp with no rewire and my fuel is working fine. I am running way rich right now but that is what I bought the S-AFC for. Another reason most don't like the walbro 255 is because YES it is noisy. If you go with the supra fuel pump mod you are going to have to "rig" it to make it work while the 255 hp is a direct bolt in. I paid to have mine put in and I'll never do that again after seeing how easy it was to do.

Originally posted by DSMNightmare
I have the HP 255. The main reason people say to use the 190 is because it is cheaper and you can do the rewire. I am running my 255 hp with no rewire and my fuel is working fine. I am running way rich right now but that is what I bought the S-AFC for. Another reason most don't like the walbro 255 is because YES it is noisy. If you go with the supra fuel pump mod you are going to have to "rig" it to make it work while the 255 hp is a direct bolt in. I paid to have mine put in and I'll never do that again after seeing how easy it was to do.

Click to expand...

so you are running the 255 HP with stock injectors, no rewire and no safc?

damn... and its working fine? and how rich ? .. did u feel a difference from stock to 255 HP

I have just bought my 255 hp and i love the sound of walbro thats it is for i hate having to rewire stuff if it was meant to be there you shouldnt have to rewire it. I am to lazy but i am having a lil bit of trouble retuning my safc. if anyone has any settings that i can try just let me know?

I do have an AFC but I do not have it adjusted. I am waiting until spring to adjust it. I run pig rich right now but I manage to squeak a 14.2@15psi@101mph with a fwd automatic 2G. I hit like 1.1 volts under WOT which I know is super rich. I am hoping once I get the mixture leaned out a little that times will be better and so will mileage. As far as daily drivablility goes I don't have any problems with that at all.

Wal-Mart 255HP or a Supra pump will over run your stock 2G regulator. It's not a question of "if". Your car will "run fine" but fuel pressure will not raise with boost properly, and the driveability and tuning of your car will suffer.

what about for 1gs?

i dont want to get an AFPR since i want my system to be as simple as possible...would a 190LPH be good enough for a big16g @ 18 psi ? at what point would i need to install 550s?

sorry to hijack the thread bro......

I have a 90 with a Wal-mart 255. With the stock regulator the FP rose to 39-40 psi with the hose on. Not a HUGE jump but............ I noticed that I would only gain roughly 4 or 5 psi going from 18 inches of vacuum to 0 vacuum. And then I would gain no more FP till roughly 5 psi manifold pressure. It made part throttle, throttle tip in, and boost response real poor. It affects the CURVE in which the fuel is delivered. I put on a Vortech regulator and turned the fuel pressure back DOWN. The throttle tip in is GREAT. The car is MUCH easier to tune now. The 190lph pump should be GOSPEL for any car designed to run 12's. If its a daily driver, gonna see 12's, get the 190lph. You can go high 11's on it, but you get my drift.

Stock Josh

I have to been doing a little research on this too, I'm goin with the 190 for my T28. an from what Ive heard the order of upgrading your fuel system is AFC(or some fuel management system)- then Injectors- then the pump.

wouldn't be better to run upgraded injectors on stock pump
than ungrading the pump forcing the fuel through stock 450s?

I'm running the 190 rewired, SAFC, 660's with a Ported FP Green and running fine. My neighbor with a GSX runs a Denso 150, SAFC, 660's and 60-1 and is running fine as well. My other bud runs a Denso 190, 680's, Haltech, Ported FP Green and no problems as well.

Originally posted by onegee
what about for 1gs?

i dont want to get an AFPR since i want my system to be as simple as possible...would a 190LPH be good enough for a big16g @ 18 psi ? at what point would i need to install 550s?

Click to expand...

Yes. Before you install the turbo.

Remember: supporting mods first.

First off, the biggest reason people run a 255 vs. 190 is because over running the FPR. I belive it more expensive to run a 255 because you need to buy a AFPR and get that set up. That could cost you up to 350 and more dollars with the right stuff. Second, Most people aren't planing to run 11 low on there street car or will not have the money to do it for years, Like me So they will not need a 255 unless they are in 10's

So a 190 is fine for an FP Green? Sweet Would a 190 and 660's be ok for a stock 14B until I can get my FP Green?

would be rich, have any sort of fuel management in your car? I dont think so according to your profile

Well, no not yet, but Ill have that. I meant would the 190 and 660's be ok for a 14B WITH supporting mods.

If you get a AFC then you might run very rich but it will run fine.

I would suggest rewireing the pump after the turbo. But You should be fine with the walbro 190 rewired.

If you have the cash go with the AEM stand alone.. Then you can run any injector size. I think??

ok, i've decided to go with the regular 255lph, not the HP.
found it for $98.

sound good?

I run 190 rewired 550's and SAFC. I run 17 psi on pump gas and 21 psi on race gas. I have no problems with my 16g.

Originally posted by FourG63 97GST
I have to been doing a little research on this too, I'm goin with the 190 for my T28. an from what Ive heard the order of upgrading your fuel system is AFC(or some fuel management system)- then Injectors- then the pump.

wouldn't be better to run upgraded injectors on stock pump
than ungrading the pump forcing the fuel through stock 450s?

Click to expand...

What are you saying that it is better to get the injectors first?

It seems like most people get the pump first?

The 255 should work fine, but if it overruns your regulator, and causes tuning problems, like it did for Stock Josh, don't say you were not warned.

I'm in your same situation, I also have a T28. Upgrading from my stock fuel system to 550s & a 190lph pump would probably have worked just fine. However, I may want to run a big turbo in the future, so I'm going all out, with a Supra pump, 850 injectors and a AFPR.

It's going to cost me over $800 for this setup. The 550s+190lph option would have cost less than half that. But I don't want to buy twice. So the amount of money you have to spend factors into the decision, too.

Tell us how the 255 works for you. I plan on reporting how much the Supra overflows the stock FPR before I install the AFPR. All in the name of science.