Twin Walbro 255 question

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Mar 2, 2013 | 03:44 PM

SPEEDinjection

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Twin Walbro 255 question

maxed out 2 intank 255s at 800whp yesterday... thought ive seen where guys have supported closer to 1k whp... anyone got any input or advise before i go order some Bosch pumps... setup is a 408ci on an S480 T6, i was on 10psi and pump gas... just thought they could flow more...also recommendations would be appreciated. Right now leaning towards 2 bosch 44s....

Mar 2, 2013 | 03:55 PM

jrpimp00

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From: Fayetteville, NC

SUre it was pumps and not injectors? WHat is your full setup

Mar 2, 2013 | 05:23 PM

buick_lsx

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When I bought my dual 255's I was told that they would maxed out around 800 wheel so that's where I am stopped at now...

You can just replace your 2nd 255 with an 044 Bosch and be good to go for a 1000 wheel

Mar 2, 2013 | 05:44 PM

Atomic

I need a gauge for that

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From: Huntsville, AL

https://ls1tech.com/forums/fueling-i...pump-flow.html

Mar 2, 2013 | 06:50 PM

gpr

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Quote:

Originally Posted by buick_lsx

will a 044 bosch fit in the factory bucket with the walbro?

Mar 2, 2013 | 07:05 PM

Cam72aro

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From: Sugar Land, Tx

Feed line size? Regulator? What rails? Lots of variables.

Mar 2, 2013 | 07:09 PM

lemons12

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From: Winchester, TN

Add another 255? You can get the twin intake manifold fitting thing and add one pretty easily.

MM has a write up for it.

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Mar 2, 2013 | 11:49 PM

SPEEDinjection

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Running Bosch 130lb injectors, -8 feed, -6 return, SPEED Inc rails, A1000 regulator

Mar 2, 2013 | 11:50 PM

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SPEEDinjection

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Lookin at aeromotive 340s... Running 1 in my Z06

Mar 3, 2013 | 01:16 AM

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skinnies

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From: KS

We've done the same on a few cars, twin 255's on e85 running out right at 800rwhp.

Mar 3, 2013 | 01:17 AM

#12

Gringotegra

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I have had 2 Aeromotives fail on me. Won't run them ever again.

Mar 3, 2013 | 01:19 AM

#13

Gringotegra

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Quote:

Originally Posted by skinnies

We've done the same on a few cars, twin 255's on e85 running out right at 800rwhp.

Hes on pump not E85 though..

My car is making 710whp on E100 with twin 255's with a good amount left in it.

Mar 3, 2013 | 01:36 AM

#14

skinnies

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From: KS

Damn, missed where he said pump. Yeah that should do 1000rwhp on pump, something isn't right.

Mar 3, 2013 | 02:27 AM

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Atomic

I need a gauge for that

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From: Huntsville, AL

If you look at my thread (and spreadsheet) you will see those pumps are way too small for your injectors.

With a 58psi base pressure and 10psi of boost you are looking at about 950rwhp.
Lowering your base pressure to 40psi will increase flow a good amount and net you about 1100hp worth of fuel.
Bosch pumps will be a significant improvement but the walbro400s would be even better.