Jdm_Rice_Monster

I what like to now what all the boosted crx's are running for there fuel pump. Also does walbro make one for a crx and is it the same as the teg fuel pump. also what is a good flow rate for up to 15lbs. thanks

ImportHatch

I'm also lookin for a pump, just to run between 7-10 psi and run wtih a fmu.


Yager-

reXem

I have 255lph FI Walbro in my Rex....I believe it was gss341, same for the 92-95 civic I think. There isnt one made specific for a crx so you have to custom mount on the bracketing in the tank.

D16A6Turbo

http://www.autoperformanceengineerin.../fuelpump.html

people on HT have talked highly about getting walbros from here...they have EF applications...

reXem

I got mine from Viren, I would recommend him...

0project dc2

iTrader: (1)

whats the procedure ?

reXem

Nothing special, you just have to a filter for your crx and then you have to attach the pump to the bracket, I used a pipe clamp.

Jdm_Rice_Monster

I didnt understand exactly what you were saying, please clarify. , (you just have to a filter for your crx) .

Thanks

Arturbo

I think he was talking about installing an inline pump. What is your fuel set up that you want to go with a intank?

art

Jdm_Rice_Monster

I dont have much of a fuel setup. I got a fmu, and a fuel rail, thats about it. I got stock injectors, pump, and ecu. I am tring to find out what would be the best fuel pump for me, and I want some 450s. I am in the process of doing my obd1 conversion I got everything but a damn p75. I am going to get a hondata soon too. I just need some much I dont know where to start but I definatly need a good fuel pump first, what do you recomend arturbo.

Arturbo

If you have the FMU, stay with the inline pump. Its a must!! If you go hondata or the AFC hack you can go with the intank.

art

Jdm_Rice_Monster

I dont use an inline, someone told me you cant because crx injectors are low impedence. I just sold my afc so I can start saving for s200 w/boost. Will my car not run right with an intank?

Arturbo

I dont know who told you that, but they are wrong. impedance has nothing to do on how the inline and fmu work together. An inanke can not flow anything above 100psi of fuel pressure. Even at 90psi it cant flow enough fuel at that high of a pressure.

yellowsub

http://www.lightningmotorsports.com has good prices on walbros.

Jdm_Rice_Monster

Someone else with a 4th gen told me that an inline didnt work with there fmu, said it would rev past 4k. Ran way too rich or something, But I dont know.

Arturbo

Stop listening.

Doodoo

I have been running a Walbro from APE for about a year. It comes with everything you need, bolts right in. The only problem I had and others have too is fuse 14 pops. I went up 5 amps and its been fine ever since. I only have the regular flow pump not the Hi Flow. I didn't feel its necessary to get it, I don't plan to run over 75psi(I think).

reXem

I want talking about an inline pump. My Walbro came with a 92-95 strainer (couldt think of the proper name last time) so you need a crx strainer (for in the tank) or elxe the pickup is all in the wrong direction

jdmtegxsi

The intank wont hurt anything but I have also heard that the inline messes with the fuel injectors around 4k as well. Maybe I need to stop listening to other as well and try a inline. try the inline and let me know.

reXem

if you are going to use a n inline make sure to buy some ear plugs! they a fuking LOUD, my walbro is noticeably louder but I have a buddy with an inline on his probe and you can hear that thing a block a way!

Jdm_Rice_Monster

Yeah, i have heard them, not exactly something I was looking foward to either.

Arturbo

The FMU was one of the greatest things in the early 80's when EFI and turbocharging where somewhat in their prime. But with todays technology and stand alones, a fmu isnt needed. But the FMU is a cost effective way to fuel your turbo set up when running low amounts of boost. First let me explain how a FMU works.

A FMU is a boost dependant fuel pressure regulator. FMUs are either adjustable(Cartech) or come with a set ratio from the factory(Vortech). Its basic purpose is to increase the fuel pressure "X" amount for every 1psi of boost. Lets look at the Vortech FMU that comes with most of the popular turbo kits like drag or rev-hard that has a 12:1 ratio. What this ratio means is that for every 1psi your turbo compresses, the fmu will raise fule pressure 12psi from what you idle fuel pressure is.

Lets do the math:
-Your turbo is compressing 7psi of boost.
-you have a 12:1 ratio fmu
- your idle fuel pressure is around 35-40psi(lets just say its 35psi).

Because we have a 12:1 fmu, and we are running 7psi of boost from the turbo:

12 X 7 = 84
This means that the FMU has raised fuel pressure 84psi more than stock idle pressure.

Now, you add that to your idle fuel pressure and we said it was 35psi, so:

84psi + 35psi = 119psi!! This means you have a total of 119psi of fuel pressure!! That is alot of fuel pressure.

Now ask yourself, should I run an inline fuel pump? Well lets look at the specs of a walbro 255lp/hr. Keep in mind, this is there "high pressure" fuel pump.
By looking at the specs of the Walbro here, http://www.autoperformanceengineerin.../fuelpump.html , and look at the specs of it at 119psi. Oh wait, they dont show it that high. It does show that it will flow 1gal/hr at 110psi which will allow your motor to run lean and blow it up. Not to mention you can damage an injector by over driving it to its extreme with the high pressure.

Please dont get confused with pressure and flow. Alot of people get those two mixed up. With the specs I just showed you it says that at walbro intank pump will flow 1gal/hr at 110psi. Just like turbos, fuel pumps flow a certain amout of fuel at a given pressure.

Inline pumps are the only pumps that can flow fuel at extreme high pressure. So the next time someone says, "I use an intak pump with my fmu and it works fine for me." you can prove to them wrong using math and specs given from the manufactor that it will work or not. And the "it works fine for me" wont cut it!

art

Sleepin'

Very informative post Art!!!!