Dual Walbros?

[strictlySupra]

hey i have read that alot of people are using DUAL walbro 255 setups.

im am curious as to how they run the lines? is it a 2-1 -8an feed or dual -6an feed all the way to the rail?

thanks in advance
jeff

 

[conundrum07]

Typically both pumps feed a -8AN line to the front and either the stock feed line is used for return or a -6AN line is ran for return.

Although, you dont really need more than a single until you are north of 500hp.

 

[tomanji84]

is there a post that explains the install for the twins? would 2 TT supra pumps work as well? I heard they were more quiet.

 

[strictlySupra]

Typically both pumps feed a -8AN line to the front and either the stock feed line is used for return or a -6AN line is ran for return.

Although, you dont really need more than a single until you are north of 500hp.

great info.

i will be aiming for about 550 - 600. i already ordered the pumps, just wasnt sure how the lines were run.. thanks!

jeff

 

[IJ.]

Make sure you use something to isolate the magnets in between the pumps.

 

[dbsupra90]

is there a post that explains the install for the twins? would 2 TT supra pumps work as well? I heard they were more quiet.

no, they are too big to fit 2 of them in the tank.

i would also suggest rewiring the power source for twin pumps. use some thick gauge wire to power a relay, then use the stock power wire as a trigger. the stock wiring is way too small to feed 2 walbro pumps.

and yes, most use a Y to make a single feed up to the rail. you could run dual -6, but 32 feet of ss line vs 17 feet is a huge cost difference.

 

[QWIKSTRIKE]

I as a renegade ran 2 -6 lines to each end of the rail. This is because I felt the need to feed the injectors evenly. I machined the return in the middle, and the hose I made -6 all the way to the tank. I used the stock hanger with the fittings drillled out, and bulk head fittings at 90 degrees in their place. I had the pumps rewired to relays, and ran them directly to the battery with the stock ignition as a trigger. I used a shield to separate the magnetic interference, and had to message the tank to get twin walbro pumps to fit

 

[MRSUPRA]

A single Walbro can handle close to 600rwhp. You might be ok with ONE for now.

 

[QWIKSTRIKE]

A single Walbro can handle close to 600rwhp. You might be ok with ONE for now.

Thats pushing it, and If you go in the tank now knowing youll need it later, and not put two pumps in is time consuming and futile. Do it once and forget about it. Same time a little more effort and no more worries until something comes up. Not to mention fuel pumps and injectors usaually are rated @ crank horse power.

 

[IJ.]

LOL @ 600rwhp on 1 walbro........ ummm yeah

 

[QWIKSTRIKE]

LOL @ 600rwhp on 1 walbro........ ummm yeah

Well we know its rated for about 500-550 crank hp and if we get 600rwhp and blow up it still made it....So there Ian.lol:naughty:

 

[MRSUPRA]

"LOL @ 600rwhp on 1 walbro........ ummm yeah"


Ummm, its been done...with some trick wiring...do some research..:icon_conf
And I have seen them do 550rwhp several times safely..Didn't he say 550 was his goal?

 

[jdub]

^^^ Might want to take a look at who you're telling to do "some research" MrSupra
http://www.mkiiitech.com/forums/viewtopic.php?t=851&sid=48b8796a946cc1aaaf4cbd8aad8efceb

Sorry dude, but your credibility doesn't hold a candle to our friend down under...not even close.

Got news for ya...a Walbro pump is middle of the road at best. If you're going to trust it to support 550 HP, at near the max capacity of a mediocre pump, well...it's your motor. One little fart and motor go Bye-Bye

 

[QWIKSTRIKE]

dont do it 550-600rwhp on a walbro is asking for trouble. Its rated for crank hp of 500-550 which equates to about 425-475rwhp dude.

 

[dbsupra90]

fuel pressure plays a big part of how much they will support.

dave had a twin setup on his and one crapped on the dyno. it was making in the upper 500rw range and was dangerously lean when the one failed.

could it support it? yeah with gobs of fuel pressure maybe. is it safe? not even close.

im just not a huge fan of twin pumps. a single walbro seems to be pretty reliable. but when running twins the reliability goes way down. it could be contributed to not running the isolator like IJ mentioned, but ive seen them fail even with it.

thats why instead of 2 walbro pumps i opted for the aeromotive external. that pump is not for everyone tho.

 

[strictlySupra]

awesome info. im running a 12 gal. fuel cell, i shouldnt have any issues fitting the pumps in.

so 1 pump will handle 500 hp reliably? i always thought to overkill so that one pump wouldnt be running under maximum load, 2 pumps spreads the load, making it easier on the other? can the isolator be made of anything? any pics on how to position the isolator and pumps?

also could i have more info on the aeromotive pump? And.. what would be a good choice for a fuel pressure regulator. haha, sorry im new to big power engines.

thanks alot!

 

[strictlySupra]

"LOL @ 600rwhp on 1 walbro........ ummm yeah"


Ummm, its been done...with some trick wiring...do some research..:icon_conf
And I have seen them do 550rwhp several times safely..Didn't he say 550 was his goal?

550 my goal yes... tuned down.

but id like the engine to stand up if i call it to say 600 or 650, i hate doing things twice. so when i build... nothing will be at max output. because thats when things break. why not build a 7 or 800 hp engine and run it at 550 all day as hard as u want. my reason being is that i am building a drift car. so everything in the car is going to be under added stress

thanks
jeff

p.s. also if anyone wants to shoot me a PM on some tricks to drop weight they are welcome to! ive done most of the obvious. just lookin for a few tricks

 

[MRSUPRA]

"Sorry dude, but your credibility doesn't hold a candle to our friend down under...not even close."

Oooohh, stop JTUB, I feel so incompetent now.

I'm just trying to give my best advice for Twincam on the situation.. A single Walbro is a simple install that can be used for applications in excess of 550rwhp. From what I have seen, it will usually run out of pressure somewhere between 550-600rwhp. Going with Two Walbro's is a lot more work to install, and I wouldn't do it unless you are definantly planning to going over 550rwhp.

Like I said, I have seen it.. But don't listen to me because I have less than 300 posts and no pictures.:biglaugh:

 

[jdub]

"Sorry dude, but your credibility doesn't hold a candle to our friend down under...not even close."

Oooohh, stop JTUB, I feel so incompetent now.

I'm just trying to give my best advice for Twincam on the situation.. A single Walbro is a simple install that can be used for applications in excess of 550rwhp. From what I have seen, it will usually run out of pressure somewhere between 550-600rwhp. Going with Two Walbro's is a lot more work to install, and I wouldn't do it unless you are definantly planning to going over 550rwhp.

Like I said, I have seen it.. But don't listen to me because I have less than 300 posts and no pictures.:biglaugh:

I'm not listening to you because the "advice" you're giving for a high HP motor is a recipe for blowing up that motor...it's just not credible.
Anyone that does listen to you (at least on this subject) will only have themself to blame if the motor goes lean under boost and melts a piston. Of course myself, IJ, and Qwik have no clue what we are talking about...compared to your all knowing experience that is.

If you would have even bothered to look at IJ's build-up thread (85 pages) you would have seen everything he does with this car shows a level of attention to detail that's amazing. Qwik is no slouch either...he can take a 7M apart with his eyes closed.

And, judging from the way you just reacted (like an immature kid)...that credibility just went to zero.
"Mr Supra"...you're not

BTW - it's Jdub

 

[tomanji84]

whats the differance to just go with a in line pump instead of the in tank ones? I would think that the aermotive (sp?) would be a better idea.. I know with our mustangs all we did was inline pumps... but as ive come to learn these toyotas are always backwards compared to fords lol.