what's up with your fruity pie signature ?

 

I can't believe that I didn't look at the dates people had posted in this thread. I did think that it was odd that Howard would be asking for fuel pump recommendations now, but I posted anyway. Don't I feel stupid now.

Zach

 

Any pros and cons on the Walbro 255? for the same 500rwhp set up......

George

 

wow, my 2003 thread arises from the dead.

'might as well add a postscript.

i decided to go w SR's Cosmo pump, Aeromotive FPR and a Kenne Bell Boost A Pump (BAP).

i have run my 850/1600 injectors to 86% duty cycle at one bar and do digitally log fuel pressure. i run 40 psi static and i show 55 psi at one bar.

my BAP is set at only 20% voltage gain once i go positive boost. i have around 8500 miles on the setup and am delighted w it.

howard coleman

 

So what horsepower will the walbro 255 pump support?

 

thanks howard!

You got any feed back on the walbro?

George

 

I have heard 350-400rwhp. That is partly why I went with the aeromotive a1000. However I have also seen some high hp setups with 2 walbros as well. But for $89 more why not go with something that is more simple.

The a1000 is good up until 800hp. I am assuming that aeromotive is claiming this to be flywheel hp. So roughly around 640rwhp. I don't plan on making that much.

 

Eh... I use the Supra TT aka Nippon Denso aka Cosmo fuel pump.

I've seen 500hp with it, AT THE WHEELS, on my old setup. 850/1600cc injectors. This was pump gas, without methanol, T78 and 24psi. Wish I had a dyno to prove it... but I wouldn't take it much past that... I don't think it would hold.

I now run the same pump but I use methanol for high boost, making it easier just to learn out the fuel from the pump, so I can push 600hp without having to worry about the fuel pump. I know this is of no use to you, but I made 500hp with the pump and it was as easy as pie to install.

-Darren-

 

im gonna run dual walbros. ill make a writeup on how it goes, havnt seen too many people using this setup

 

FYI: Walbro 255hp (model#341) with direct battery voltage (13.5-14v) been in the car for over 2 years, managed over 450rwh on the dyno and 128-130mph traps on pump 94 octane.
With a T67 turbo fuel pressuere is hitting 62psi and dropping to ~56psi @7.5krpm/ 20psi of boost....time to upgrade:-)

The MKIV pump is also a good choice and will supply 500fwh with no problem.

Voltage to the pump is critical...and hot wiring a pump will make a hell of a difference.

JD

 

Thanks, As stated I had no personal experience just this person says type of situation.

Dual walbros should be more than enough fuel for almost any rotary application. I would be interested in seeing a write-up. However I do remember seeing a picture of the setup quite a while back.

 

I'm running dual walbros (rewired). On stock wiring.. it didn't work out so well. Car had a really bad stumble when it would switch the pumps from 9v (idle) to 12v (cruise).

 

Interesting...... So If you run a pump like the bosch 044, one must have some voltage controler for it no? I am not sure if the wolf 3D vers 4 (plugnplay) actually uses the fuel pump resistor on the fd. i must check it out.... otherwise a voltage controller must be set up.

therefore, i gather that 255 LPH is only good for 400- 450 rwhp... being safe.....right?

I also heard of problem with the dual pump set up, like stumbles and pickup problems....

 

https://www.rx7club.com/forum/showthread.php?t=496894

 

Well, after I rewired them (two wire runs straight from the battery, to two relays, and then using the stock wiring to fire the relays) I've had no problems. On stock wiring it was a nightmare.

Also, I was told one walbro maxes out around 350-400wheel, and I have more than that and don't want fuel pressure problems.

 

ok... this may sound stupid. But the stock pump FD is said to support 300-350 rwhp...

How about two FD pumps, one on pri and one on sec. that should support 550 bhp right?

I was going to use the vent line for a main. That is, stock supply secondary rail, purge line to primary rail, stock return line. Then, ore Y the two pipes to a single feel, or, each pump to each line..... anyone tried this?

Whats with 2 fd pumps on stock wireing......

 

I don't know about stock fd pumps supporting 350rwhp. A walbro is cheap insurance, I mean what do they cost $80-$90 now? And I know the "correct" way to do duals is to use two feeds. Use the stock feed to feed the primary rail, use the stock return to feed the secondary rail, and then use the vent line as the return. I just did it this way because it's a lot easier and seems to be working fine.

 

I'd be scared to push 400-420 with a Walbro 255, as z-beater's experience has indicated.

The Bosch 044 can push a little bit more, but I would still worry pushing over 450.

(Yeah, call me conservative!)

I've been trying to collect data on most of the easily available fuel pumps out there...
http://fc3spro.com/TECH/MODS/FUEL/fpump.htm

The Aeromotive A1000 / Eliminator have both proven to handle 500hp at the wheels no problem; these things are noisy though.

I've seen too many SX fuel pumps fail, and I would never run one myself.

If I were to do my car, I would run dual Bosch 044's myself.


-Ted

 

You can rewire them for a constant 13vdc. This was done to my cosmo so there wasn;t a stumble.

 

if you buy a warlboro, make sure you get the right one!!

lots of ebay stores will sell you the low pressure version. (see attachments)

i use these guys: http://www.autoperformanceengineering.com/
they're like $20 more than most ebay stores, but you KNOW what you're getting. small price to pay for piece of mind.

 

Yeah.. I know.. did you read my post?

 

No, someone done learn me how to spoke.

I caught it after the fact =)

 

well, so I will be going to rwin walbro it seams! snd use to lines! It should support the 1680cc/1000cc with that set up!

Thanks for the insights......

George

 

I was just going to run a denso pump. Is there any added benifit of running both the stock pump and the denso or should i just stick with the single denso?? I will be running a 850cc/1600cc setup.

 

How noisy? louder then idel? cruise?