LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Walbro 255 Lph fuel pump

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Old Apr 8, 2016 | 06:45 AM
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Default Walbro 255 Lph fuel pump

Can the pump feed a 700+hp motor? Any suggestions is greatly appreciated. Thanks.
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Old Apr 8, 2016 | 06:56 AM
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Single or twin? Pump gas or e85? Boosted? Meth or alky added?
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Old Apr 8, 2016 | 07:23 AM
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A single in tank. Race gas,naturally aspirated. Thanks
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Old Apr 8, 2016 | 07:50 AM
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I was suggested to run a 340 at an estimated ~625 NA, even though my 255 had the upgraded hotwire kit.

No point cheaping out on the fuel pump on the type of build you are talking. You'd already be over 10k into the motor anyway .
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Old Apr 8, 2016 | 02:09 PM
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I would not risk it. I think ~600chp is about the max I would be willing to go with a 255 340 pump. I would do a Weldon with some -10an feed lines with a sump and be done with it. If you were going to drive it on the street a a lot I would suggestion the double intank setup as those weldons are loud and can heat up under continuous duty without lower the voltage.
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Old Apr 8, 2016 | 03:23 PM
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Originally Posted by BOLO
Can the pump feed a 700+hp motor?
Pretty sure the answer is "no".

Maybe you could try dual 255's? Think a guy on the Impala SS Forum went that route.....

KW
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Old Apr 8, 2016 | 05:10 PM
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The answer you are looking for is "yes". The correct answer is "no".

A single 255 lph pump would "safely" support 450-500 at the tires. Adding just a second pump will increase that to over 1,000 at the tires. Or there are larger single pumps that will support 700 HP.
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Old Apr 8, 2016 | 07:06 PM
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Walrbo 450lph isn't much bigger and should handle gas NA power you want.

What size injectors?
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Old Apr 8, 2016 | 08:22 PM
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Originally Posted by Nostang
I would not risk it. I think ~600chp is about the max I would be willing to go with a 255 340 pump. I would do a Weldon with some -10an feed lines with a sump and be done with it. If you were going to drive it on the street a a lot I would suggestion the double intank setup as those weldons are loud and can heat up under continuous duty without lower the voltage.
Thanks for the suggestions


Originally Posted by KW Baraka
Pretty sure the answer is "no".

Maybe you could try dual 255's? Think a guy on the Impala SS Forum went that route.....

KW
I'll look into it, thanks

Originally Posted by CALL911
The answer you are looking for is "yes". The correct answer is "no".

A single 255 lph pump would "safely" support 450-500 at the tires. Adding just a second pump will increase that to over 1,000 at the tires. Or there are larger single pumps that will support 700 HP.
Some say that a single 255 will feed a NA motor up too 600rwhp

Originally Posted by Shownomercy
Walrbo 450lph isn't much bigger and should handle gas NA power you want.

What size injectors?
I run 60# injectors.
Will the Walbro 450 fit in the LT1 bucket?

Originally Posted by Puck
I was suggested to run a 340 at an estimated ~625 NA, even though my 255 had the upgraded hotwire kit.

No point cheaping out on the fuel pump on the type of build you are talking. You'd already be over 10k into the motor anyway .
Of course not, not with this build. I'm already at the least 10K
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