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Twin Walbro 255 question

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Old 03-02-2013, 03:44 PM
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Default 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....
Old 03-02-2013, 03:55 PM
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SUre it was pumps and not injectors? WHat is your full setup
Old 03-02-2013, 05:23 PM
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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
Old 03-02-2013, 05:44 PM
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I need a gauge for that
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https://ls1tech.com/forums/fueling-i...pump-flow.html
Old 03-02-2013, 06:50 PM
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Originally Posted by buick_lsx
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
will a 044 bosch fit in the factory bucket with the walbro?
Old 03-02-2013, 07:05 PM
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Feed line size? Regulator? What rails? Lots of variables.
Old 03-02-2013, 07:09 PM
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Add another 255? You can get the twin intake manifold fitting thing and add one pretty easily.

MM has a write up for it.
Old 03-02-2013, 07:51 PM
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Intank and 1 inline 255? Set-up in series?

Put them in Parallel and you'll get what you want.
Old 03-02-2013, 11:49 PM
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Running Bosch 130lb injectors, -8 feed, -6 return, SPEED Inc rails, A1000 regulator
Old 03-02-2013, 11:50 PM
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Lookin at aeromotive 340s... Running 1 in my Z06
Old 03-03-2013, 01:16 AM
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We've done the same on a few cars, twin 255's on e85 running out right at 800rwhp.
Old 03-03-2013, 01:17 AM
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I have had 2 Aeromotives fail on me. Won't run them ever again.
Old 03-03-2013, 01:19 AM
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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.
Old 03-03-2013, 01:36 AM
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Damn, missed where he said pump. Yeah that should do 1000rwhp on pump, something isn't right.
Old 03-03-2013, 02:27 AM
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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.
Old 03-03-2013, 03:16 AM
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Triple manifold fitting***
Old 03-03-2013, 03:22 AM
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I upgraded pumps from the 255's to the new e85 400/450/460 lph pumps in the same surge tank !!!!did the job nicely !!!
Old 03-03-2013, 04:20 AM
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What about Walbro 300 or DW pumps??

Congrats on the new numbers man I just saw the dyno vids sounds sick
Old 03-03-2013, 08:07 AM
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Thanks Venom... Atomic im running around 43 bfp...could jack it up but my tuner doesnt like that idea
Old 03-03-2013, 08:08 AM
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Venom are the walbro 300s same size physically as the 255s?


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