opinions please

 

just get the walbro and you will be set for anything in the future!!!
The afc is something dif than just a fuel pump. You will prob be best with both but fuel pump before afc in most cases

 

if u get the walbro...make sure u get the FPR (fuel press regulator)

but yea i would get the pump and safc...they will help out alot, and u can tune better with the safc so u can get alot out of it.

 

neither......

 

how is the walbro going to help out on an "all motor setup"!?!? come on guys.. yes, it would be most beneficial if not a must if you were going with any forced induction setup.. but for all motor i dont really see the point, youre just wasting your money.. the apexi safc would help out though.. with your air/fuel curves.. to help you better tune your car.. but the only way that you are going to see real gains is by going and getting it dyno'd.. that way they can fine tune to get the most hp.. but hey its your money do what you want.. if it were me i wouldnt worry about the fuel pump youll be fine with the factory one with a all motor setup..

 

If you get the fuel pump you dont need a fpr.

 

Well fck it, you dont need anything really. All motor will be just fine. I was just saying that the fuel pump would be a good addition.

 

What the hell are you talking about?? Even boosted guys that are using the Walbro 255 LPH fuel pump need an adjustable FPR to bring down the base fuel pressure. That pump without a FPR on an N/A car will cause the engine to run rediculously rich, killing power and MPG. Not a good idea. The Walbro 255 is overkill for any N/A application. OEM is fine.

And don't use the S-AFC to tune too much. The S-AFC intercepts and alters the MAF signal to the ECU, we all know that. But the ECU also uses the MAF signal (as well as RPM) to determine which ignition timing map it is going to use. Adjust too much A/F with the S-AFC and you could cause the ignition timing to be outta whack. Use a tuned ECU as a base then make small adjustments with the S-AFC if you need to.

 

Then how about the emanage w/stock ECU instead of the SAFC? Esp with a 98 or 99 ECU who have few other options.

 

98 has always been able to use a 95/96 JWT or TS ECU.
99s just recently have the option of I think both.

 

Interesting because I have the Walbro fuel pump in my N/A car. I got the Walbro because of the SC I used to have. I just didn't bother to take it out. I don't have a FPR. Never had one, even when I had the SC. Somebody told me I should leave it in because it's not going to make a difference. Guess he's wrong? I still got the stock one, should I put it back in?

 

Depends on your future modding plans. You planning to stay N/A??

 

yes u do...unless u wanna throw ur money away on gas then u don't


u'll be running 2 rich

 

Actually I don't plan to do any more mods. However, I want to get the most of what I have now. So that will mean I'm going to stay NA.

 

If i were you I'd stick the OEM'er back in there and just sell the walbro. If you kept the walbro you would have to buy an adjustable FPR to bring the base fuel pressure way down. Even then, the ECU is tuned for a particular fuel pressure/volume. That would be a band-aid fix. Unnecessary headache IMO. Even the 190 LPH lo-pressure pump without a FPR causes an N/A car to run rich, so imagine how much power you're missing out on right now with the 255.

 

99 still can't use the JWT

 

you can run with the walbro in with out mods. It might raise fuel pressure by 3psi maybe but your car is not going to explode or suddenly stop working...but if your not going to use it you might make $ from it

 

what if i'm running 70 shot of nitrous? 99% of the time I'll be running N/A

 

You should get a Walbro 190 LPH lo-pressure fuel pump with an adjustable FPR if you don't want to run too rich off spray.

 

Of course the car will run. You're still wasting gas and missing out on some HP though.

 

Just an update. I put the stock fuel pump back in today. Don't know if it will make any difference in performance. If all it does is give me better fuel economy, then it's going to worth putting the stock one back in. I don't know if the Walbro took away performance, but I noticed that I had to fill up more often than before the Walbro. I'll update you guys.

 

Drove around a bit today. Result? Not a bit of difference in performance. Still feel the same. However, like I said, if all it does is give me some mpg back, then it's good enough.

 

Sorry bro, not true....if he goes with the 255lph FP and no adjustable FPR, his fuel pressure will go up by more than just 3psi! Regardless, if you plan on staying NA, there is no need for such a large fuel pump....the stock unit is more than adaquate for NA purposes and if you truely think you need a better FP, then go with the 190lph.

 

Without a fmu you wont be runnig too rich. Pressure will just build up and the extra gas will just flow right pass the injectors. I dont see the issue you guys are seeing.

 

Man you really don't have a clue. Even if he had an FMU it wouldn't do anything because there's no BOOST!!!

Moreover, the 255 LPH pump WILL raise base fuel pressure higher than stock. His questions have already been answered by people that know better.

 

The Walbro will raise fuel pressure about 7 psi above normal. This will cause it to deliver about 10% more fuel at idle and 8% more fuel at WOT (fuel flow is proportional to the square root of the pressure increase), but only during open loop operation, i.e. during cold start and whenever you exceed a certain throttle position (about 40%). It will not affect idle once the engine is warmed up and it won't affect normal driving in closed loop because the increase in fuel pressure is not enough to exceed the ecu's capability to achieve stoichiometric afr.

I installed a Walbro 255 lph pump about two months before I installed an adjustable fpr, and didn't see any noticeable change in driveability.

 

The amount of fuel an injector delivers is proportional to both the pulse width and the pressure drop through the injector. So, yes, increasing fuel pressure will increase flow through the injector.

 

Ok, 7psi. Why do not think what I say is credible here. A fuel pump, I been boosted since the 20th century

Same for you nismology

 

Who the fu(k cares that you're boosted?? The person that started the thread is N/A.

 

Don't we have a fuel return line? If not, then I'd have to agree that a 255lph fuel pump is overkill on our engines. Anyone have more info on the 190?
-Cyrus

 

Yes, we do. Why do you ask?

 

Then wouldn't any excess fuel in the fuel rail be sent back to the tank, regardless of what lph is being pumped in?

 

Yes, but the injectors still see the additional 7 psi of fuel pressure since the fpr is after the injectors in the fuel system. Or are you talking about something else?