Does anyone know if there is a dual fuel pump sending unit in production for the FC's ? I've seen the CJ Motorsports sending unit for the FD. Would the FD sending unit work in an FC ? The shape looks the same in pictures but are the demensions the same ? Sorry for the FD ignorance, haven't spent much time with FD's .

 

FD sending unit won't fit in the FC. The FD has the luxury of having a humongous sending unit unlike the FC.

An FC one will fit a pair of Walbros side-by-side but only barely. The reason I know is because I went through this a few years back when I converted my fuel system to a dual pump, full parallel, w/ -8AN hardline setup.

B

 

run a surge tank setup

 

Thanks for the info Brian. I kinda guessed that they would be different. I have thought about the surge tank idea but I already have 2 walboro 255 pumps. I've got another sending unit out of another car and I'm a pretty decent fabricator, so I'll probably end up fabbing up my own dual pump with parallel line setup. Thanks again guys.

 

pm me if you need an electrical connector for your custom pump setup... i can get you a weld on bung with 6 terminal fuel safe connectors (same connectors from the CJ setup, its indentical but wiht the connector pass-thru being a weld on bung, so you can add 6 wire pass thrus to your setup or weld it over where the stock connector was

 

im running a bosch 044 with a surge tank setup and a intank walbro. i was having the same prob tring to get two walbro intank and just said the hell with it and went external

 

do you really need two fuel pumps?

 

Appreciate that phunk, I might be interested in that. I'll let you know.




Well......I'm upgrading to a 60-1 turbo with much larger AR numbers than the TO4B that's on it now. Along with 1600cc secondaries, 44mm WG, and more than likely a Power FC with the Banzai harness for a FC. Steve Kan tuned my car last spring and after talking with him he recomended more fuel pump for this turbo. Either a Supra TT pump or another walboro pump since I already have one. ( less expensive than the Supra pump even with the additional plumbing involved ). So that's why I planned on running dual pumps. I'm open to suggestions though, nothing is set in stone or done to the car yet.

 

I ran 21psi with that almost exact setup (720/1680 on a T04S 60-1 with Power FC) and a rewired Supra TT pump with race fuel. No fuel pressure issues.



my old walbro on left, supra TT on right . I completely bypassed the resistor relay when wiring. Here's more info on my setup: (disregard the discussion about gasoline's effect on wires in a fuel tank, just look at the wiring diagrams) https://www.rx7club.com/2nd-generation-specific-1986-1992-17/pics-my-overkill-fuel-pump-rewire-732904/

 

I think you may be misunderstanding what Steve was saying. He probably was saying that you would need more fuel injector so that you wont max out your injector duty cycle. It really depends on how much boost you plan on running, but one fuel pump is enough to supply your fuel system with enough pressure.

 

Wow that supra pump puts out more than I thought. Thanks for the link to your write up on that. My rewire is done exactly the way the first diamgram shows. ( from 1300cc ). Maybe I should consider changing to your rewire. Do you think the Walboro pump would suffice with the larger injectors and the Power FC ? Or should the walboro pump make it's way to the wifes TII and drop in a Supra TT pump ? I thought I saw somewhere on this forum that someone ( can't remember who ) was putting down almost 500 RWHP with a single walboro pump and stock fuel plumbing ( not parallel ).



And to Banzai....... I only plan on pushing about the same as before for boost ( about 16 PSI ) so I can stay on pump gas. Maybe I did misunderstand what Steve said, I'll have to call him back and clarify ( plan on him tuning for me again this spring in Denver, at least I hope so ) Maybe I do only need one pump. That would save alot of plumbing hours for me.

 

J-rat claims he did 550rwhp on a single walbro. PM him. IMO Denso made pumps are just better quality (Cosmo pump, Supra pump)

when you switch to a standalone you don't need the resistor relay at all, not when you can tune the idle mixture with more precision than you can on the factory ECU.

 

Good to know. I never thought about that. I think it's time to start looking at Supra TT pumps.

 

check out this guide I made for 2nd gen users of the Power FC. It covers wiring, ECU pinout, electric fan control, and some differences between tuning the FD and the s4 FC TPS. it also has a section in it about deciding whether the PFC is the right standalone for you:

http://www.geocities.com/arghx/PowerFC.FC3S.Tuning.doc

 

That's freakin awesome. Thanks a bunch, I appreciate that. I've read about the first half of it so far. I'll have to sit and read it from top to bottom tomorrow when I'm not so tired.