How much can the Walbro push?
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How much can the Walbro push? Mods in the sig, single in-tank Walbro 255L, stock lines, Speed Inc rails w/ -8 rails and crossover and 42# injectors. Using available calculators, I estimate about 420rwhp NA. I sprayed a jetless single 5177 Solenoid (1st Stage). Didnt have the WB working, and no FP Gauge, but looking at the log I have plenty fuel remaining. I will be attempting to add another 120 or so shot. In the end I want to nail a 200/100 staggered stage dry.
Do you have a hotwire kit on there? Usually a Walbro W/ hotwire kit (or Racetronix kit) can support right around 600 rwhp on a F-Body. Relocate the regulator to the fuel rails and run a return and you can support another 50 hp or so. The add a boost a pump (Racetronix harness has a provision for them) and pick up another 50 - 75 hp or so.
Matt
Matt
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Sorry, forgot I do have the hotwire kit. Guess I need to research getting a Boost-a-pump, never actually seen one or thought about it before.
Rail mounted regulator sounds nice, but such a PITA to run another line front to back. I have heard other benefits include more stabil fuel pressure (less chance of lean spikes) as well, any comments on that?
Rail mounted regulator sounds nice, but such a PITA to run another line front to back. I have heard other benefits include more stabil fuel pressure (less chance of lean spikes) as well, any comments on that?
It isn't that bad doing a FRM FPR. You can either run a 6an Teflon hose back as a return or you could use the vapor line that goes to the purge solenoid on the intake. You are correct, the main benefit of the FRM FPR is the FP stability.
Originally Posted by CAT3
Sorry, forgot I do have the hotwire kit. Guess I need to research getting a Boost-a-pump, never actually seen one or thought about it before.
Rail mounted regulator sounds nice, but such a PITA to run another line front to back. I have heard other benefits include more stabil fuel pressure (less chance of lean spikes) as well, any comments on that?
Rail mounted regulator sounds nice, but such a PITA to run another line front to back. I have heard other benefits include more stabil fuel pressure (less chance of lean spikes) as well, any comments on that?
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Hmmmm -6 AN line running back.. Now, I could simply put a bulkhead fitting anywhere on the tank, preferable the top, and call it good correct? I wouldn't need to have it enter any specific place to avoid swirling etc... Might be checking into this.
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Originally Posted by CAT3
Hmmmm -6 AN line running back.. Now, I could simply put a bulkhead fitting anywhere on the tank, preferable the top, and call it good correct? I wouldn't need to have it enter any specific place to avoid swirling etc... Might be checking into this.
The F99 module requires the return port be used AND the internal regulator be bypassed but NOT removed. If you simply remove the regulator it will create problems.
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Originally Posted by CAT3
Mods in the sig, single in-tank Walbro 255L, stock lines, Speed Inc rails w/ -8 rails and crossover and 42# injectors. Using available calculators, I estimate about 420rwhp NA. I sprayed a jetless single 5177 Solenoid (1st Stage). Didnt have the WB working, and no FP Gauge, but looking at the log I have plenty fuel remaining. I will be attempting to add another 120 or so shot. In the end I want to nail a 200/100 staggered stage dry.
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Matt, the FPR is the small rectangular piece vicinity of the rearend well area, where the main fuel line goes in, and then one line outputs to feed the engine, the other returns to the tank correct?
Racetronix, is there a dual in-tank setup, or larger output single?
Devon, was that your old setup or did this happen recently? I thought you were running good lately. I think with the 28" tires, some weight reduction (already have the parts, jus need to install) and maybe another 100shot I can be where I want it to be w/o messing with anything else. We'll see.
Racetronix, is there a dual in-tank setup, or larger output single?
Devon, was that your old setup or did this happen recently? I thought you were running good lately. I think with the 28" tires, some weight reduction (already have the parts, jus need to install) and maybe another 100shot I can be where I want it to be w/o messing with anything else. We'll see.
Originally Posted by CAT3
Matt, the FPR is the small rectangular piece vicinity of the rearend well area, where the main fuel line goes in, and then one line outputs to feed the engine, the other returns to the tank correct?
Racetronix, is there a dual in-tank setup, or larger output single?
Devon, was that your old setup or did this happen recently? I thought you were running good lately. I think with the 28" tires, some weight reduction (already have the parts, jus need to install) and maybe another 100shot I can be where I want it to be w/o messing with anything else. We'll see.
Racetronix, is there a dual in-tank setup, or larger output single?
Devon, was that your old setup or did this happen recently? I thought you were running good lately. I think with the 28" tires, some weight reduction (already have the parts, jus need to install) and maybe another 100shot I can be where I want it to be w/o messing with anything else. We'll see.
I can't wait to get a standalone and make a good full pass on both stages if everything is ok! 
Sounds like you are talking about the "T" fitting. The regulator is in the fuel pump module, it sits above the pump. The "T" fitting is the return that goes to the regulator.
Matt
Matt
Originally Posted by CAT3
Matt, the FPR is the small rectangular piece vicinity of the rearend well area, where the main fuel line goes in, and then one line outputs to feed the engine, the other returns to the tank correct?
Last edited by Matt@HSW; Feb 2, 2006 at 08:01 AM.
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Matt, yes I was referring to the T fitting part. So, if I run a line, and plumb it like 227Hawk mentioned, into the filler neck...Do I need to pull the fuel pump module, remove the regulator or ?
Racetronics, or Matt, when is the return at rails and reg kit for the vettes going to be ready for shipping. I need one, or I'll have to go to '97/98 rails, help. Sorry for hogging your thread Cat, but i have to catch your time before you get to far away.
Robert
Robert
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Originally Posted by Robert56
Racetronics, or Matt, when is the return at rails and reg kit for the vettes going to be ready for shipping. I need one, or I'll have to go to '97/98 rails, help. Sorry for hogging your thread Cat, but i have to catch your time before you get to far away.
Robert
Robert
I'd much rather run while I can, then sit back and watch you play catch-up! 