Author Topic: Fuel pump choices (Read 792 times)

1984 s-12 · « **on:** 07:56:31 PM / 14-Apr-12 »

I have a 84 et, since my fuel pump whent bad I was wondering if I can use a vg30e fuel pump or a Walbro 255 without a tune.

turbokid · « **Reply #1 on:** 10:27:31 AM / 17-Apr-12 »

of course you can run a walboro without a tune just get a nice ajustable regulator

Arro · « **Reply #2 on:** 12:35:15 PM / 17-Apr-12 »

You don't need a 255, get the 190. It won't overrun your factory regulator, and it has enough fuel flow to support ~350hp. You will need a lot more parts and $$$$$ before you need something larger than the Walbro 190. The only people who need a 255 are professional drag racers, pro drifters, pro rally racers, pro road racers, .... etc etc. Oh and people who wanna look cool because they bought "the best"

Buy the 190.

sideways_s12 · « **Reply #3 on:** 12:30:03 AM / 18-Apr-12 »

Hey I have a 255 & im none of the above lol....

Draconis · « **Reply #4 on:** 12:36:32 AM / 18-Apr-12 »

Could go with an Aeromotive Stealth. I want to swap out my 255 for one.

Arro · « **Reply #5 on:** 12:51:06 PM / 18-Apr-12 »

Quote from: sideways_s12 on 12:30:03 AM / 18-Apr-12

Hey I have a 255 & im none of the above lol....

No offense, but a number of us thin you are washing out your cylinders with too much fuel. You have only ever defined "no problems" as "I don't see any yet". It's known that the regulator's stock spring is too weak for a 255.

Quote from: Draconis on 12:36:32 AM / 18-Apr-12

Could go with an Aeromotive Stealth. I want to swap out my 255 for one.

This guy... the OP... do.... not.... need....

Unless he's going for BIIIIG power numbers, he doesn't need the 255. Period. So he also saves money and time because he also doesn't need an aftermarket FPR.

No offense to Jason (sideways) or to Colin (Draconis), but neither of you represent the average modestly tuned setup. Jason, you just throw in a buttload of fuel and don't really fine tune, so you're never sure what's really going inside the engine... and over time that could have bad results. Colin, your beast needs a lot of things that a modestly tuned (boosted) four cylinder doesn't.

The Walbro pumps were a favorite in the DSM world, long before most people here were even out of high school. We used to laugh at the noobs who would wanna go "big" and buy the 255, and then when they had their cat-cons clog, saw detonation, and were unable to control their fuel flow reliably (stabilly) because they ran too big a pump on a stock reg... when there were guys running the 190lph model, pushing 17psi on pump gas, putting own ~275hp.... while the people with 255's carelessly thrown in were busy sorting out their unpredictable fuel (or buying more parts like the FPR) the 190 guys were actually moving on to well-controlled tunes.

Yeah, we laughed. Sometimes we even tried to educate them. Some of them listened, a lot of them didn't.

Just depends on what you want out of your engine I suppose, but really unless he's gonna be going for some respectable power limits, the 255 is overkill and will need an adjustable FPR (which will be another variable to tune) if he doesn't want to wear out his cylinder walls and rings in the not too distant future.

190 means it bolts right in, you change NOTHING else, so you don't have to spend extra $$$, and you don't have to tune anything (like an adjustable FPR).

sideways_s12 · « **Reply #6 on:** 04:08:15 PM / 18-Apr-12 »

How am I washing out my cylinders I have a fuel pressure reg and an safc which I fined tuned down so im not running rich that was before the ecu took a shit on me.....what I said about dont see any problems yet were the injectors with the way I modded them...

Arro · « **Reply #7 on:** 05:51:01 PM / 18-Apr-12 »

Then you fall under Colin's category where I pointed out that a 190 won't need all that fancy stuff.

Just a 190 pump. Installed. No special additional support mods required.

sideways_s12 · « **Reply #8 on:** 10:00:42 PM / 18-Apr-12 »

Yeah true I got the fpr with all the bartco stuff so 255 is fine although it might have been easier to tune with the 190 but on the other hand I was planning on running more than 8 psi out of the evo3 16g...

Jay · « **Reply #9 on:** 10:54:45 PM / 18-Apr-12 »

I have a 190 on my KA.

Zero issues, and way overkill for it's (current) requirements.

1984 s-12 · « **Reply #10 on:** 10:12:57 AM / 19-Apr-12 »

Thanks for the help.

turbokid · « **Reply #11 on:** 07:13:28 PM / 29-Apr-12 »

my stock pump runs 60 lbs

200srdrift · « **Reply #12 on:** 07:22:42 PM / 29-Apr-12 »

Quote from: Arro on 12:51:06 PM / 18-Apr-12

No offense, but a number of us thin you are washing out your cylinders with too much fuel. You have only ever defined "no problems" as "I don't see any yet". It's known that the regulator's stock spring is too weak for a 255.

This guy... the OP... do.... not.... need....

Unless he's going for BIIIIG power numbers, he doesn't need the 255. Period. So he also saves money and time because he also doesn't need an aftermarket FPR.

No offense to Jason (sideways) or to Colin (Draconis), but neither of you represent the average modestly tuned setup. Jason, you just throw in a buttload of fuel and don't really fine tune, so you're never sure what's really going inside the engine... and over time that could have bad results. Colin, your beast needs a lot of things that a modestly tuned (boosted) four cylinder doesn't.

The Walbro pumps were a favorite in the DSM world, long before most people here were even out of high school. We used to laugh at the noobs who would wanna go "big" and buy the 255, and then when they had their cat-cons clog, saw detonation, and were unable to control their fuel flow reliably (stabilly) because they ran too big a pump on a stock reg... when there were guys running the 190lph model, pushing 17psi on pump gas, putting own ~275hp.... while the people with 255's carelessly thrown in were busy sorting out their unpredictable fuel (or buying more parts like the FPR) the 190 guys were actually moving on to well-controlled tunes.

Yeah, we laughed. Sometimes we even tried to educate them. Some of them listened, a lot of them didn't.

Just depends on what you want out of your engine I suppose, but really unless he's gonna be going for some respectable power limits, the 255 is overkill and will need an adjustable FPR (which will be another variable to tune) if he doesn't want to wear out his cylinder walls and rings in the not too distant future.

190 means it bolts right in, you change NOTHING else, so you don't have to spend extra $$$, and you don't have to tune anything (like an adjustable FPR).

fuel regulation is controlled by the ecu. so does not matter what pump is in/out the tank your motor will run fine. Ive had a 255 walbro on a stock 150 hp ka24de and also now with my stock SR with FMIC

sideways_s12 · « **Reply #13 on:** 09:04:18 PM / 29-Apr-12 »

Then your car is special because I tried to install the 255 I have on my ca18det without an fpr and it would run hell it didnt want to start it would start idle for a couple secs then die because the pressure overran my stock fpr

200srdrift · « **Reply #14 on:** 09:10:14 PM / 29-Apr-12 »

yup i got that special special edition rare jdm s12.......... only had my 255 on my SR20 and its fine. pulled the CA out the day I got my 200.

Arro · « **Reply #15 on:** 09:33:00 PM / 29-Apr-12 »

No way the ECU controls fuel pressure. There is a sprung fuel pressure regulator on the middle of a CA18ET and CA20E fuel rail. And that regulator sports too weak a spring. And I have a KA24DE in my S12, and it also has a sprung FPR. So does the SR. So does the CA18DET, the RB, a VH, a 2JZ-GTE, a Honda B-series... and on and on and on. There is no wire going to anything other than the injectors. Injector pulse width is NOT the same thing as fuel pressure.

ECU controls injector pulse width. Fuel pressure is a vacuum-dependent process. This is the case with nearly all fuel injected cars, and no offense but if you don't understand that then you need to return to the basics. Like I said I mean no offense, it's a common misunderstanding to confuse pulse width control (the squirt timing and duration of the injectors) for fuel pressure regulation.

There are lots of guys who run a 255 on a factory regulator and get by, but their tunes are rough. They might think their car is tuned well, but it isn't. And on cars with aging factory FPR's, the spring is weakened and that contributes to an even less controllable tune.

Cajun1guy · « **Reply #16 on:** 07:46:56 AM / 01-May-12 »

I went with a Walbro 190 and had to replace the OEM FRP as it ran way rich when under any boost. I got an egay aftermarket one, didn't work right. I got a Nismo adjustable FPR and now I am happier. It still goes rich when under boost, but the cloud of black smoke is gone and it recovers much quicker.

Arro · « **Reply #17 on:** 12:18:34 PM / 01-May-12 »

Yeah the NISMO one is a nice part. Most of the time a 190 is fine, your original FPR's spring was probably weaker than normal or the diaphragm was screwed up a bit, and it was never working right in the first place.

sideways_s12 · « **Reply #18 on:** 07:55:47 PM / 02-May-12 »

where did you get the nismo part from in case i need to replace my egay one...

Cajun1guy · « **Reply #19 on:** 08:38:37 AM / 07-May-12 »

I found it on egay. I just did a search for Nismo fpr and it comes up. I shopped for a bit, and found some place selling it for $130, so I got it. The instructions were in Japanese just like the HKS BOV I found on there. It's a little funny to mount, but I worked it in there and I am happy with the results.