Nitrous jetting help.
Thread Starter
Joined: Jan 2003
Posts: 949
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Nitrous jetting help.
Does anyone have any good links for nitrous jet tables?
I have been playing with my nitrous system for the past two weekends and need help with it.
Started with the 100 shot. Jets 55 NO2 and a 42 Fuel. With those jets my AF gauge just pegs 10.
So I then jetted up to the 150 shot. Jet 70 N02 and a 53 Fuel. Same thing happened with the AF gauge.
Next I tried the 42 fuel with the 70 N02. Still to rich.
Fuel pressure is at 48psi.
Should I just keep leaning it out?
I have been playing with my nitrous system for the past two weekends and need help with it.
Started with the 100 shot. Jets 55 NO2 and a 42 Fuel. With those jets my AF gauge just pegs 10.
So I then jetted up to the 150 shot. Jet 70 N02 and a 53 Fuel. Same thing happened with the AF gauge.
Next I tried the 42 fuel with the 70 N02. Still to rich.
Fuel pressure is at 48psi.
Should I just keep leaning it out?
Senior Member
iTrader: (4)
Joined: Feb 2003
Posts: 713
Likes: 1
From: shawnee, ks
Car: 87 Firebird
Engine: 5.3 76mm
Transmission: Rossler TH400, PTC converter
Axle/Gears: Strange 12bolt, 3.08s
Re: Nitrous jetting help.
Your fuel pressure is the problem. You have WAY to much for that jetting. Those jet sizes are similar to what i run on my carbed set up with 6psi.
http://www.robietherobot.com/NitrousJetCalculator.htm
This site was REAL close for me, and landed me in the mid 11's on A/F.
Are you using a wideband, or narrow band gauge?
http://www.robietherobot.com/NitrousJetCalculator.htm
This site was REAL close for me, and landed me in the mid 11's on A/F.
Are you using a wideband, or narrow band gauge?
Junior Member
Joined: Sep 2007
Posts: 50
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From: indiana
Car: 78 Z28
Engine: 350
Transmission: 3500/th350
Axle/Gears: 5.13
Thread Starter
Joined: Jan 2003
Posts: 949
Likes: 0
From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Nitrous jetting help.
Your fuel pressure is the problem. You have WAY to much for that jetting. Those jet sizes are similar to what i run on my carbed set up with 6psi.
http://www.robietherobot.com/NitrousJetCalculator.htm
This site was REAL close for me, and landed me in the mid 11's on A/F.
Are you using a wideband, or narrow band gauge?
http://www.robietherobot.com/NitrousJetCalculator.htm
This site was REAL close for me, and landed me in the mid 11's on A/F.
Are you using a wideband, or narrow band gauge?
I wonder why NOS wants you to run a .070 and a .055. I will be ordering a .038 fuel jet today.
Senior Member
iTrader: (4)
Joined: Feb 2003
Posts: 713
Likes: 1
From: shawnee, ks
Car: 87 Firebird
Engine: 5.3 76mm
Transmission: Rossler TH400, PTC converter
Axle/Gears: Strange 12bolt, 3.08s
Re: Nitrous jetting help.
My base NOS jetting was also PIG rich, around 9.6 a/f. The car black smoked, and with a "100" shot jet (47n2o i think) the car BARILY picked up. After i leaned it out, you could really tell it picked up when the spray was on.
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Thread Starter
Joined: Jan 2003
Posts: 949
Likes: 0
From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Nitrous jetting help.
Well I picked up a .039 and .038 today. Going to try it out this weekend once I get my breather tank finnished.
Member
Joined: Dec 2007
Posts: 199
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From: mattoon illinois
Car: 92camaro,86 camaro
Engine: 355
Transmission: 700r4
Re: Nitrous jetting help.
im using a edelbrock system on my carb 350 and cant find right jets for it look on ebay and it looks like no one has them can any one help?
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
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