Basically i wondered if i can run a walbro 255 inline pump on my fb TII. I am running a TO4b .96 a/r, .60 compressor on a stock port (about 10 psi of boost) with a FMIC, Haltech, and a custom full 3" exhaust. Also, do i need a rising rate fuel pressure regulator, or will a good quality adj. fpr supply enough fuel at full boost and throttle??

 

I think I need a rising rate fpr (FMU), but still not sure about the pump

 

http://www.sdsefi.com/techsurge.htm

Check the link. This is what I did, just a bit differant.

http://groups.msn.com/ChucksRX7/1983...oto&PhotoID=96

I ran two pumps on this system. works great. I tried to run a EFI pump in place of the stock 5psi pump with bad results. The EFI pump needs atleast 7/16 fuel line from the tank to the pump. 1st gen carb fuel tanks have 3/8 fuel line from tank to pump. Useing the stock turboII FPR, one FPR per pump.
chuck

 

thanks chuck, ill try it. Are you using any filter besides the stock one in the back?

 

rotorizit
Used three 1st gen stock fuel filters. One after the fuel tank, one right before the surge tank and one on the return line from the surge tank to the fuel tank. The two filters at the surge tank surved as my fuel surge tank sight glass, just to visually see fuel moving to and from.
I should have run a EFI filter after the EFI fuel pumps but did not. I used the Airtech E8246 external fuel pumps. Rated at 60-70gph at 70psi, max was 125psi. cost was around 125-150 from a local part store. RacingMazda.com suggested the fuel pump.
chuck

 

chuck
what kind of fuel pressure regulator did you use? Was it a FMU, which allows for more fuel pressure when you are under a load(via vaccum line). Or will a good quality adjustable regulator work, say one that adjusts from 30-80 Psi?

 

I used the stock TurboII FPR. The stock turboII FPR will increase your fuel pressure under boost. 1-1 ratio. AT 20psi of boost my fuell pressure was 60psi. Pump on, engine off fuel pressure was 40psi.


chuck

 

You already have a programmable ECU; the RRFPR would add useless variability and should thus be avoided.

The stock TII FPR should be fine, so long as:
a) You hook up the manifold reference line
b) Your injectors are large enough to flow the fuel you need at less than 100% (pref. < 80%) injector duty cycle at the pressure the TII FPR wants (probably 38psi-ish)

I made a web page to help figure out how much HP various fuel system components will support:
http://www.maxcooper.com/rx7/how-to/...tem/calcs.html

Otherwise, an adjustable FPR (which is different from a RRFPR) from Aeromotive, SX, etc. should work fine.

-Max

 

You really don't want an FMU for this; that's why you have a haltech.

ALL EFI fpr's will raise fuel pressure with boost, and all EFI FPR's will drop fuel pressure under vacuum.

A rising rate FPR (or FMU) changes the rate at which fuel pressure increases when referencing boost. A typical 12:1 FMU (common with centrifugal supercharger kits) just means for every psi of boost, it raises the fuel pressure 12 psi. Its an easy way to add more fuel, but when you get into higher boost levels, rail pressures start to exceed 100 psi, which lowers fuel pump flow.

With a haltech you can simply alter the injector pulsewdiths to comopensate for added fuel under boost.

 

Thanx for the info guys. I will probably buy a good adjustable fpr, or maybe the stock TII.

 

I tried to tell ya Mach!!!.....Rising rates are usually used for Blow through setups. You have a Haltech, all ya have to say is "let there be fuel"....given your pump and injectors can handle it........thanks for the added support guys.