14b is only good up to about 20psi....

fpr is needed for the 255. Some say its not, but you should. Some even say that its needed with the 190, but I know people doing that without one just fine.

With stock injectors you dont need the 255.

You should just re-wire your stock pump, xpecially if your cost driven.

Thanks,

I was going to do the re-wire, is that for maintanence or does it improve anything?

190lph without a FPR will be fine. 190lph is enough for a 16g. I would also go with 550's if you want to run that much boost.

AWDfrank said:

Thanks,

I was going to do the re-wire, is that for maintanence or does it improve anything?

Click to expand...

At higher rpm the voltage drops at the fuel pump. The rewire will make sure your pump has a constant 14 volts instead of the 10 volts it usually gets. This makes the pump push more fuel, not lose voltage, and quiets down walboro pumps.

AWDfrank said:

Thanks,

I was going to do the re-wire, is that for maintanence or does it improve anything?

Click to expand...

The stock power wire to the pump is very thin causing the pump to get less than desirable voltage to the pump. Less voltage means less flow. Running a thicker guage power wire to the pump will give you a more constant and greater fuel flow. Getting yourself a re-wire kit (includes thicker wire, relay, etc) will make the job very simple.

Thanks a lot!

I didnt say what boost I wanted but I was going to try to run 17 on pump gas, so I don't know if that's ok with just a 190 and stock injectors.

17psi is achievable with stock injectors, and a stock re-wired fuel pump.

Hes not using the 16g.....

SO theres really no point for a bigger pump to support it....

Id say you be alright.

There is a huge difference between something that "works fine" and something that's done correctly.

The OEM FPR is designed for the stock fuel pump and injectors with a safety factor included on top of that. I surely do not know what the safety factor is; however, if the designers stayed with the more common practice it will only be about a 20% safety factor.

With that in mind the 190 will push the limits of the OEM FPR. Sure some say it works fine; however, I am willing to bet that if those same people actually used a logger that's comparable to the one inside DSMLink they would find out that "working fine" and being correct are 2 different things.

A 255 will definitely need an AFPR.

If you're going to upgrade the pump just get the 255 (since they're basically the same price as a 190) w/re-wire kit and an AFPR and be done with it.


my 0.02 and your call.

PieEyedPiper said:

17psi is achievable with stock injectors, and a stock re-wired fuel pump.

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I doubt he could run 17psi safely (no knock, fuel cut) on 91 octane.
Every car is different but running 17psi on a 14b on a stock fuel setup, even with the pump rewired, caused me to hit fuel cut when I was using 93 octane.
The only time I could run 17psi on stock fuel system was when I used race gas.

FORMANTOYO thanks for the advice.

I think ill go with the 190 re/wired. I know if I don't have the money i should just wait to do anything but since it seems relatively safe to run 17 psi with what I said, ill do that...for now at least.

Make sure that you are monitoring your engine with either an EMS or atleast a pocketlogger. It looks like you have a 1g. If so, the OBDII Pocketloggers are capable of logging knock.

So as you turn up the boost, watch your knock. It's not very safe to run high psi on low octance fuel because it's unstable and vunerable to predetonation.

That being said, it's your call on how high you want to run the boost. Just be careful.

I still reccomend 550's at 17psi on a 14b. On a stock setup my idc's where pretty high on 450's.

Also to the poster saying he had fuel cut with stock fuel system doesnt make sense. You where getting fuel cut because you where over running the maf and boost leaks cause that. Fuel cut has nothing to do with how much fuel you are getting.

I have an obddatalogger uberfastgsx.

And to jayrolla I might be geting some evo 8 injectors (560cc i think). Im still going with a 190 to keep my stock fpr.

AWDfrank said:

I have an obddatalogger uberfastgsx.

And to jayrolla I might be geting some evo 8 injectors (560cc i think). Im still going with a 190 to keep my stock fpr.

Click to expand...

And hopefully some way to tune the larger injectors. Otherwise "you'll be back".

I said in one of my post I have a safc2... I wanted to go with dsmlink for obvious reasons but I got the afc cheap from my friend.

with a logger and safc2, you're golden! rewiring your stock fuel pump and pumping your boost up until you feel comfortable with your injector duty cycle not being too high. I don't recommend 255 fuel pump if you're looking to save, since you will need a different fuel regulator. You can always upgrade your pump and FPR later if you want to get a larger turbo. Keep it simple, don't spend money if you don't *need* to, since you're on a budget.

To jump in,

How about and EVO3 running on a re-wired 190, 650s, AFC, and a pocket logger looking for no more than 300whp?

Eastwood95 said:

I doubt he could run 17psi safely (no knock, fuel cut) on 91 octane.
Every car is different but running 17psi on a 14b on a stock fuel setup, even with the pump rewired, caused me to hit fuel cut when I was using 93 octane.
The only time I could run 17psi on stock fuel system was when I used race gas.

Click to expand...

Hitting fuel cut has nothing to do with your fuel delivery system nor the octane value.

MyÜberFastGSX said:

So as you turn up the boost, watch your knock. It's not very safe to run high psi on low octance fuel because it's unstable and vunerable to predetonation.

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What is predetonation? It's either detenation or pre-ignition, no such thing as pre-detenation.

So why was I able to run 17psi on race gas without fuel cut, but I hit fuel cut @17psi on 93 octane. I understand that it is really "boost cut", and it has nothing to do with fuel delivery. It has everything to do with the MAS seeing too much air.

Eastwood95 said:

So why was I able to run 17psi on race gas without fuel cut, but I hit fuel cut @17psi on 93 octane. I understand that it is really "boost cut", and it has nothing to do with fuel delivery. It has everything to do with the MAS seeing too much air.

Click to expand...

I suspect you didn't hit fuel cut, instead it was stuttering caused by fuel starvation. Lean -> knock -> pulled timing.

well that makes sense then.....

thanks

No problem.

Wouldn't predetonation mean that there is no detonation, isn't that what you want ?