Lean spike at shifts
#32
If a cutoff were to raise it's ugly head, you would see the IPW drop and rise back up quickly, within a frame. Did you post up your tune file, I would like to look at it. I am agreeing, it is fuel/pressure related.
#33
Originally Posted by 12secSS
If a cutoff were to raise it's ugly head, you would see the IPW drop and rise back up quickly, within a frame. Did you post up your tune file, I would like to look at it. I am agreeing, it is fuel/pressure related.
I went thru a **** load of old scans when I had the 43#'s and did 1/4 mile runs and other WOT runs. I never really caught on for some reason but there was always a "bump" to lean in the 2/3 shift. I just replaced the inline so it has to be a dead stocker or partial stocker or the system just can't handle the pooooooower. And I don't believe the last one. I am gonna pull the stocker and mod a walbro 255 into it. So I'll have 2 255's, one inline and the other in the tank. I guess that should do it.
Josh, emailing a fedex label to you in a few minutes.
#34
Notorious BIG
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got the label, i'll have the pump out to you on monday
edit: i would ship it tomorrow but i have a crazy busy day so i won't have time to drive to the fedex drop off place. sorry....
edit: i would ship it tomorrow but i have a crazy busy day so i won't have time to drive to the fedex drop off place. sorry....
Last edited by Holty; 06-15-2007 at 09:24 PM.
#35
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Originally Posted by dewmanshu
So I'll have 2 255's, one inline and the other in the tank. I guess that should do it.
#36
Hello Dave
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Originally Posted by Holty
as you already know that setup is what fixed my problem completely although i did go one step further and replaced the fpr and added a magnavolt. the most important thing though is that you found the problem.
Justin
#37
Originally Posted by dc_justin
Magnavolt on an 03... Not sure if that's a good thing there josh. Watch your fuel pressure in boost, if it rises more than 1psi per 1psi of boost, then your pressure is increasing too much. Gotta keep that pressure differential constant.
Justin
Justin
#38
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the magnavolt has absolutely no affect at all on fuel pressure. it was exactly the same before and after i installed it. as far as fuel pressure increase related to boost, it is about .5 psi of fuel pressure per 1 psi of boost on my truck. my MAX fuel pressure is 62psi.
#40
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Originally Posted by dewmanshu
FIXED!!!
Put the walbro 255 in the tank, 2-3 shift goes to 10:1 if not 9.5:1AFR. It's so rich cause I had the VE inflated to bandaid the issue before.
Holty...my pressure gets to 68psi.
Put the walbro 255 in the tank, 2-3 shift goes to 10:1 if not 9.5:1AFR. It's so rich cause I had the VE inflated to bandaid the issue before.
Holty...my pressure gets to 68psi.
but am i remembering correctly that at one point you adjusted your FPR to make your psi a little higher? could that be why you have much higher psi than most?