Walbro 255; stock FPR?

[Eclipse98_RS]

Ok, first off I did a search and couldnt find any of these two linked together and I had a question about it. I am going to be getting a walbro 255 in my car very soon. The question I have is " If I have 550cc Injectors, and a wally 255, will it overpower my stock FPR?"
Any info is welcomed, and like I said I did a search and couldnt come up with anything, so if you find some info please point me towards that.
Thanks,
-Dan

 

[turbosax2]

When you put in the 255, you will need to upgrade the fpr.

 

[1LE]

Wow. This thing has been beaten to death, surprised you couldn't find anything!

Anyways, the short answer is yes and no. You'll be OK for awhile, but eventually the stock FPR will fail from the bigger pump. Lots of people do it and say "it's fine", then they sell the car to somebody else a year later that gets stuck with the hard to diagnose failure!

 

[scottsee]

Wow. This thing has been beaten to death, surprised you couldn't find anything!

 

[EclipseTrbo420A]

Dont do its its never ok....while its no failing completly, it will be constantly over run.

 

[chicagoavenger]

You didn't search very hard

 

[unlmtdndeavor]

it may be overrun. but it will overrun the same amount each time correct? so why not just tune out the overrun. which is what i have done.

 

[gdmbat85]

it may be overrun. but it will overrun the same amount each time correct? so why not just tune out the overrun. which is what i have done.

please explain how you tune out a mechanical problem? once u get off the gas all the fuel pressure is gonna get shot to the regulator. the regulator isnt going to be able to relieve the pressure fast enough and the pressure is gonna build in the fuel lines. think of it as a BOV relieving air pressure, cant relieve pressure fast enough the turbo will surge and get destroyed. the problem really begins because injectors arent designed to hold high pressures and remain closed. the soliniod in the injectors will get damaged and then u can start having big problems. back to the question. no you can not SAFELY run a 255 on the stock fpr. you have 3 choices, from good to best. 1 rewire the stock pump. 2 get the 190lph pump and keep the stock fpr. 3 255 with an aftermarket fpr.

 

[DGajre777]

Dan - Yes, you need an AFPR with a 255. If you have 550cc injectors, you'll be fine with a 190 pump without the need of an AFPR. According to Forced Performance the 190 pump is good for 400whp, if you don't plan on running close to 400whp, stay with a 190 pump.

 

[elfroggo]

I have an afpr but only because I like bling.

And no, an AFPR does not work like a BOV. You won't damage an injector from not running an afpr because of fuel pressure.

This whole issue isn't really cut and dried yet. You might run richer at idle with the overrun without an afpr. Is it possible that you could run into some weird tuning issues. Yes. Does not running an afpr automatically mean your engine will blow? No. Many people have their cars running fine without an afpr

The walbro 190 is supposed to overrun the stock fpr also, just not as badly.

please explain how you tune out a mechanical problem? once u get off the gas all the fuel pressure is gonna get shot to the regulator. the regulator isnt going to be able to relieve the pressure fast enough and the pressure is gonna build in the fuel lines. think of it as a BOV relieving air pressure, cant relieve pressure fast enough the turbo will surge and get destroyed. the problem really begins because injectors arent designed to hold high pressures and remain closed. the soliniod in the injectors will get damaged and then u can start having big problems. back to the question. no you can not SAFELY run a 255 on the stock fpr. you have 3 choices, from good to best. 1 rewire the stock pump. 2 get the 190lph pump and keep the stock fpr. 3 255 with an aftermarket fpr.

 

[Smevans]

Get the AFPR, if you try to compensate it with say, the SAFC, then you're gonna start messing with the timing and all that.

 

[tstkl]

please explain how you tune out a mechanical problem? once u get off the gas all the fuel pressure is gonna get shot to the regulator. the regulator isnt going to be able to relieve the pressure fast enough and the pressure is gonna build in the fuel lines. think of it as a BOV relieving air pressure, cant relieve pressure fast enough the turbo will surge and get destroyed. the problem really begins because injectors arent designed to hold high pressures and remain closed. the soliniod in the injectors will get damaged and then u can start having big problems. back to the question. no you can not SAFELY run a 255 on the stock fpr. you have 3 choices, from good to best. 1 rewire the stock pump. 2 get the 190lph pump and keep the stock fpr. 3 255 with an aftermarket fpr.

wow, your very,... well,... special.

the reason the stock regulator gets "overrun" is that the FLOW RATING OF THE FUEL PUMP (the 255 vs. the 190) is higher and the stock regulator is too restrictive to flow out all the extra fuel coming from the new pump. This will happen at a predictable rate. Fuel pressure will increase at a predictable rate, and your afr will drop at a constant rate. You CAN VERY EASILY tune out the problems created by running a pump that is too large.

Im not even going to touch your comment on injectors getting attacked by high fuel pressures, since we ####ing run turbocharged cars and our fuel pressure rises at a 1:1 ratio with boost, and people run 30+psi all the time.

think about this one long and hard before you respond.

 

[lordnikon_04]

well said tstkl

 

[vr4play]

I was running a 255 w/ no afpr for a while with no problems. I recently went to 880 injectors (I was maxing my 660s) and had a problems tuning. I then went to a afpr, but that didn't fix my tuning problem. Long story short, I had a bad knock sensor. I am not about to start campaigning for or against the afpr, but it didn't change my performance/tuning/gas milage situation and I don't really care for the added "bling" under the hood.

 

[Eclipse98_RS]

I seem to be getting mixed reviews here. I havent actually put the 255 in my car yet, just ordered the parts. (Im getting the fuel pump and a turbo timer installed) How much would a FPR cost to be able to handle the new fuel pump?

 

[Strm Trpr]

Here's a link for ya...
http://www.importevolution.com/prod...=3629&osCsid=38ba9fa5af5a2cc8a1532b8e6bd12b3d

 

[unlmtdndeavor]

get it if you want it. it's not necessary. there are plenty of people that have ran without one and tuned for the overrun. don't listen to gdmbat85, your injectors will not go bad by running high fuel pressure.

 

[dave99gst]

a 2g stock FPR does a better job maintaining f/p then a 1g stock FPR.

a non-rewired 255 LP should be fine on the stock 2g FPR
a rewired and/or 255 HP would need a upgraded FRP on both a 1g and 2g

 

[FlipDsM]

i've had my 255lph fp for more than 3yrs now with stock injector, fpr, and no fuel controller(i have 2G). there hasn't been any major problems other than the occational hard to start after a short trip, which i'm not sure of if this is even related to the stock fpr. i put more than 60k miles with my setting and the car still runs (if not better) great. with my fpbig28 and slipping stock clutch, i was still able to full a 14.3 @ 99.78mph in a 1/4mi. although, i do think sometimes that i've been lucky for not breaking anything with my crappy setup.

 

[DJYoshaBYD]

NO AFPR, NO 255 PUMPIE!!! You will over run it, and like homeboy said, if you try and compensate for the overrun with a SAFC, then you start screwing with your timing... Just spend a little more and get one... You will thank us and yourself later on for doing it

(not going to say "Just my .02" because its hella played)

 

[tsiawd1995]

I have had 255 and 255hp on a stock fpr for over 5 years with no signs of overrun on my 2g. With that being said my 1g did have some overrun issues with a 255hp.

 

[SvarO]

different opinions here, so 2g it good for 255 walbro or not?

 

[Eclipse98_RS]

Ive gotten about 60% saying its bad and about 40% saying it is ok. It would only be about 2 or 3 months that I would be running a stock FPR. After that, I will have enough money saved up to buy that and a few more upgrades.
What im asking, is will it be ok to run my car like this 255 fuel pump with stock FPR for 2-3 months?
Also I saw on one of the posts about the car running rough after short trips when you start it back up again. Like, for example: I drive 8 miles to my buddies place, go in, have a beer and leave. Total time of like 10-15 mins at his house. I start it up and it has a rough idle. What causes this? Is it because I have 550cc injectors on a stock fuel pump? (i dont have the 255 in yet, still waiting to get it installed.)

 

[Strm Trpr]

I ran a Supra TT Fuel Pump on a stock fpr for at least a year.
I just recently rewired it and installed an AFPR much like the setup from Import Evolution.

Just so you know, a Supra TT pump out flows a Wally 255hp.
When one is rewired, it flows approximately 290lph, according to RRE.

Oh and just so everyone knows, I have a white 2gb, and I don't have any soot on my rear bumper at all...

 

[oldman]

I must say I'm rather disappointed, the amount of mis-information on this thread is just rediculous, some are coming from experience members.

1. 255 or 190 (to a lesser degree) will overrun stock fpr's, 1G or 2G. If you're running without an AFPR and you have a gauge to prove you have no overrun, something is wrong with your fuel system. I'll go ahead and say that most of you claiming no overrun doesn't own a fuel pressure gauge.

2. Much like you can't tune out venting a BOV with stock MAFs, you can't tune out FPR overrun. Why? Because the changes are NON-LINEAR and load based, anyone who claims they can tune it out, please provide detail information as to how, it would be the first.

3. No, higher fuel pressure will not make your injectors leak, there are people out there running 60 psi base pressure, the weak link when running higher pressure is the pump, not the injectors.

4. The smaller the injectors you have, the worse and the longer the duration of overrun.

5. An AFPR isn't just for dialing down base pressure and prevent overrun, it's a handy complimentry tuning tool when used properly.

6. The extra gas money you'll spend on overrun will pay for an AFPR in no time.

I'm not here to argue with you guys, these are facts, not opinions. The only reason this thread isn't closed, OP warned for asking a FAQ question and bunch of negative rep points handed out to some is because there are too many mis-information in here that needs to be addressed. Go ahead and ask follow up questions if you're unclear on my post, if you're going to dispute facts, make sure you bring facts of your own other than "I have been running one without any problems". The debate on this subject is long over, much like venting.