Walbro 405 install in 8.1L truck bucket?
11-03-2017, 07:53 AM
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Walbro 405 install in 8.1L truck bucket? Hi everyone, tomorrow I plan on swapping out my Walbro 255 for a Walbro 450. I'm already using the 8.1L bucket with my 255 and was wondering what exactly I'll need to do/modify in order to install the 450. This is going in a 2005 GTO with a non-return fuel system, with goals of 700-750 RWHP on 93 octane and no methanol.
I hear some people say the bucket will need to be drilled, and others say it won't. If it does need to be drilled, what size hole do I need to drill, how many, and where in the bucket (bottom?? side?)? Thanks everyone!
-Andrew
I hear some people say the bucket will need to be drilled, and others say it won't. If it does need to be drilled, what size hole do I need to drill, how many, and where in the bucket (bottom?? side?)? Thanks everyone!
-Andrew
11-03-2017, 10:18 AM
#2
Depends on the bucket which I've never seen.
The non-return systems you have must have a return it's just not at the rail. My 98 was just after the filter with a regulator just in the tank. When I put my 450lph in the idle pressure went from 58 to 68psi, so you might have a similar jump in pressure with it. Just thought I'd warn you that it could happen.
The non-return systems you have must have a return it's just not at the rail. My 98 was just after the filter with a regulator just in the tank. When I put my 450lph in the idle pressure went from 58 to 68psi, so you might have a similar jump in pressure with it. Just thought I'd warn you that it could happen.
11-03-2017, 11:25 AM
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Thanks for the info! Yeah, my apologies, I'm pretty ignorant about things after the pump and before the rails. I guess I should have said it's not a full-return system-- it's just whatever it has from the factory.
I appreciate the warning. Are there any complications from the 10 PSI or so increase in idle pressure? If so, what can be done to correct it??
I appreciate the warning. Are there any complications from the 10 PSI or so increase in idle pressure? If so, what can be done to correct it??
11-03-2017, 04:55 PM
#4
No need for apologies. I forget to add things or say things wrong in posts all the time.
A tuner can make adjustments as long as the injectors can open a short enough time to fuel it at idle. That time depends on the injector, but most can't go below 1ms and still be consistent, some are 1.5ms and there may be some that need 2ms.
A tuner can make adjustments as long as the injectors can open a short enough time to fuel it at idle. That time depends on the injector, but most can't go below 1ms and still be consistent, some are 1.5ms and there may be some that need 2ms.
