how much fuel pressure can i run with a walbro 255 pump?
- Thread starter sy445
- Start date
Re: how much fuel pressure can i run with a walbro 255 pump?
I might be topped out w my injectors. Not sure. I have 50# and a walbro. From what i read 500-550 horsepower is around max for that power. I know im approaching that if not close. I dont plan on trying to push any more fuel cause ill be spraying alky but it could be alittle bit richer at full boost for pump gas tune. Just seeing if I can get away with that safely before upgrading the fuel system or injectors
I might be topped out w my injectors. Not sure. I have 50# and a walbro. From what i read 500-550 horsepower is around max for that power. I know im approaching that if not close. I dont plan on trying to push any more fuel cause ill be spraying alky but it could be alittle bit richer at full boost for pump gas tune. Just seeing if I can get away with that safely before upgrading the fuel system or injectors
JSM
Active member
Re: how much fuel pressure can i run with a walbro 255 pump?
depends how much boost your running also, remember it will add 1psi for every pound. So if your base is 40 and 20psi boost, you have 60psi spraying.
I would say you can run up to 60psi base. Try 50 first. At some point you may need another pump though. Your getting real close on a single walbro HP wise.
depends how much boost your running also, remember it will add 1psi for every pound. So if your base is 40 and 20psi boost, you have 60psi spraying.
I would say you can run up to 60psi base. Try 50 first. At some point you may need another pump though. Your getting real close on a single walbro HP wise.
James Thomas
"NO CLASS"
Re: how much fuel pressure can i run with a walbro 255 pump?
Don't forget that as pressure goes up (so does heat and amp draw)..... flow goes down. Saw a Mustang guy one time with 70+ psi base on a boost referenced Vortec regulator install. His rail pressure was over a 100psi under boost and just couldn't figure out why he was still lean and popping head gaskets like my daughters PEZ dispenser :rotf: .
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James
Don't forget that as pressure goes up (so does heat and amp draw)..... flow goes down. Saw a Mustang guy one time with 70+ psi base on a boost referenced Vortec regulator install. His rail pressure was over a 100psi under boost and just couldn't figure out why he was still lean and popping head gaskets like my daughters PEZ dispenser :rotf: .
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James
Tooky
Serious about performance
Re: how much fuel pressure can i run with a walbro 255 pump?
How fast is your truck? I think some Syclones have gone at least 11.0s with the single Walbro. With alky you can go further. You can tell if you're out of fuel when you keep raising the fuel in the chip and the wideband continues to read lean at high boost.
How fast is your truck? I think some Syclones have gone at least 11.0s with the single Walbro. With alky you can go further. You can tell if you're out of fuel when you keep raising the fuel in the chip and the wideband continues to read lean at high boost.