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Running lean on a 150 shot wet

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Old Mar 7, 2009 | 01:22 PM
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From: colorado springs Elevation: 6035 ft
Default Running lean on a 150 shot wet

I was at the dyno yesterday and my car had a 13/1 afr on motor and went to 16/1 on the 150 shot. Im running a nitrous outlet plate kit. the car made 318 rwhp and 461 rwhp on the bottle. Why would me car lean out like that? Could it be air in the fuel line and noid? This is the first time ive sprayed the kit.
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Old Mar 7, 2009 | 01:46 PM
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you sure you got the right fuel jet?
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Old Mar 7, 2009 | 02:29 PM
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it will have a quick lean spike but should have dropped back quickly after that. have you got a fuel pressure gauge ? it may be the pump.
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Old Mar 7, 2009 | 08:02 PM
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From: colorado springs Elevation: 6035 ft
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Yup right fuel jet. 62N 38F It has a brand new walbro 255 in it. Ill put a gauge on it.
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Old Mar 8, 2009 | 09:54 AM
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Maybe someone pissed on your LT1 ? haha

Was it a 16/1 spike or did it run out across the graph like that ?

Spikes are common in the beginning of a dyno run .

I would look into your fuel supply for sure .
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Old Mar 8, 2009 | 10:06 AM
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Originally Posted by pyro719
I was at the dyno yesterday and my car had a 13/1 afr on motor and went to 16/1 on the 150 shot. Im running a nitrous outlet plate kit. the car made 318 rwhp and 461 rwhp on the bottle. Why would me car lean out like that? Could it be air in the fuel line and noid? This is the first time ive sprayed the kit.
No idea whats up with your A/F. Mine was right on the money, and there was no lean spike to speak of with Daves plate kit. I gained what you did, as far as the increase of rwhp with the 150 jets.
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Old Mar 8, 2009 | 04:02 PM
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From: colorado springs Elevation: 6035 ft
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I put a gauge on it today and it has 40psi and with the regulator unplugged it has 45psi. But whn I spray the fuel noid pressure drop to 35psi Think a hotwire kit will help this?
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Old Mar 8, 2009 | 05:31 PM
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Originally Posted by pyro719
I put a gauge on it today and it has 40psi and with the regulator unplugged it has 45psi. But whn I spray the fuel noid pressure drop to 35psi Think a hotwire kit will help this?
I'm not sure, but my quess is, it can't hurt. Normally when you see the pump in someones sig, you take it for granted they used the hotwire kit.
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Old Mar 8, 2009 | 05:40 PM
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From: colorado springs Elevation: 6035 ft
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I just ordered a ractronix hotwire kit. Hopefully this will give me enought fuel. Im only making 460rwhp I think it might make 480 with fuel lol
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Old Mar 10, 2009 | 12:41 AM
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Have you varified the fuel solenoid is firing and flowing strong?
Dave
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Old Mar 10, 2009 | 09:55 PM
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Yup pulled the line off the plate and sprayed it into a beer bottle. alot of air came out at first but then a solid spray of fuel came out.
Filled the bottle about 1/4 up with just three quick sprays from a 38 jet. while bogging the engine.
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Old Mar 10, 2009 | 10:52 PM
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Originally Posted by pyro719
Yup pulled the line off the plate and sprayed it into a beer bottle. alot of air came out at first but then a solid spray of fuel came out.
Filled the bottle about 1/4 up with just three quick sprays from a 38 jet. while bogging the engine.
Why would it bog the engine?...my understanding is that a wet kit adds the fuel....so when u spray it ur injectors shouldnt spray extra fuel therefor no bog.
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Old Mar 10, 2009 | 11:02 PM
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From: colorado springs Elevation: 6035 ft
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It bogged when I sprayed the fuel noid into a beer bottle with the car idleing. Because pressure dropped to 35psi
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Old Mar 10, 2009 | 11:20 PM
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Pressure should not drop. Your pump is not sufficient.
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Old Mar 11, 2009 | 12:05 AM
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From: colorado springs Elevation: 6035 ft
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3 month old walbro 255, I got the hot wire kit to keep voltage up at the pump. The stock wiring is only 18 gauge cant be good
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Old Mar 11, 2009 | 07:40 AM
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From: GB MD
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do you have an aftermarket regulator?
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Old Mar 11, 2009 | 07:52 AM
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From: colorado springs Elevation: 6035 ft
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Nope. Put a new stock tegulator in it 3 m onths ago as well.
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Old Mar 11, 2009 | 08:20 AM
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From: GB MD
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the 255 on a good regulator should feed 700 fwhp easy. if you emptying the lines on that small shot something is not right either the regulator or pump. did you change the fuel filter? also try blocking off the fuel noid so its not actually flowing fuel just clicking . If it still drops it could be a voltage issue instead of a fuel flow issue.
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Old Mar 11, 2009 | 08:59 AM
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Originally Posted by pyro719
It bogged when I sprayed the fuel noid into a beer bottle with the car idleing. Because pressure dropped to 35psi
Its going to drop when you have the line venting into the bottle. Just think of it as a giant leak. You need to verify that a) you're not seeing a huge pressure drop while spraying b) the plunger isn't swollen (keep in mind plungers lift off the seal mere fractions of an inch) c) you're line isn't too long. Start with the basics first.

Nick
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Old Mar 11, 2009 | 06:54 PM
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From: colorado springs Elevation: 6035 ft
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I didnt just spray the open line into a bottle. I conected the fule line to a nossle with the 38 jet in it.
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