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fuel press on spray?

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Old 10-03-2008, 12:49 AM
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Just up'd my shot to a 150. I have a in tank walbro 255 and when I hit it I went down to 50psi. Is this still good to spray on? It pretty much dropped 10psi cause it will normally sit about 60 psi when Im driving. A/F was kind of rich at 10.9-11.2ish aswell...
Old 10-03-2008, 08:16 AM
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normal is 58 so ur droppin 8 lbs. do u have the hot wire kit? if not i would recommend do this this.
Old 10-03-2008, 10:17 AM
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no...thats the last thing I need to do. I know normal is 58psi, but thats under no load.
Old 10-03-2008, 10:23 AM
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no, it should NEVER leave 58. when u hit it at first it should drop a few lbs but should come back up..

but it on a dyno to check it. or run a hose up ur cowl of the windshield and put a gauge on the end of it, take it to the streets and hit it.
Old 10-03-2008, 11:24 AM
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What does the pressure do when you are N/A under a load?

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Old 10-03-2008, 04:25 PM
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Originally Posted by 99WS7
Just up'd my shot to a 150. I have a in tank walbro 255 and when I hit it I went down to 50psi. Is this still good to spray on? It pretty much dropped 10psi cause it will normally sit about 60 psi when Im driving. A/F was kind of rich at 10.9-11.2ish aswell...
What's interesting is your a/f despite the pressure drop. Does the pressure recover or does it linger at 50psi throughout? What does the a/f look like N/A? What jet sizes are you using?

Nick
Old 10-03-2008, 08:24 PM
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.25 fuel .46 N20 for the pills Im running from TNT. Under load N/A it will drop to 58psi or so and A/F is at mid 12's to high 12's on the top end. I think it comes up a little under load when I spray. I need to do more logging cause I just put the 150 shot pills in and I really dont spray the car very often. I did do a quick hit on it today to see where it was and the A/F was at low 11's on the juice so that seems ok. I just got retuned recently and were still tweaking the tune, I also just put new 02 sensors in because my right one was intermediate and now with the new ones that may be affecting my tune making it run a little richer since it was intermediate when I got it tuned. Looks like Im gonna have to step up and do the hot wire kit and get the tune tweaked a little...??




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