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Nitrous jetting help.

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Old Jul 20, 2008 | 12:35 PM
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grover85's Avatar
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Car: 1986 Iroc
Engine: 5.3
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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?
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Old Jul 21, 2008 | 10:54 PM
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From: Manitoba
Car: '91 GTA
Engine: 421sbc
Transmission: Powerglide
Axle/Gears: Ford 9" with 3.89
Re: Nitrous jetting help.

dry or wet kit?

what brand of kit?
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Old Jul 22, 2008 | 11:28 PM
  #3  
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Nitrous jetting help.

Wet kit, NOS plate, NX solenoids and bottle.
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Old Jul 23, 2008 | 08:46 AM
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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?
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Old Jul 23, 2008 | 08:53 AM
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From: indiana
Car: 78 Z28
Engine: 350
Transmission: 3500/th350
Axle/Gears: 5.13
Re: Nitrous jetting help.

http://www.nitroussupply.com/baselines.php
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Old Jul 23, 2008 | 09:13 AM
  #6  
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From: New Germany, MN
Car: 1986 Iroc
Engine: 5.3
Transmission: 4L80E
Axle/Gears: 9 Inch w/ 3.55
Re: Nitrous jetting help.

Originally Posted by MaxxMitchell
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?
I am using a dynojet wide band kit.
I wonder why NOS wants you to run a .070 and a .055. I will be ordering a .038 fuel jet today.
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Old Jul 23, 2008 | 09:42 AM
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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.

Originally Posted by grover85
I am using a dynojet wide band kit.
I wonder why NOS wants you to run a .070 and a .055. I will be ordering a .038 fuel jet today.
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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Old Jul 23, 2008 | 11:42 AM
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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.
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Old Aug 4, 2008 | 07:11 PM
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1986chevycamaro's Avatar
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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?
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Old Aug 5, 2008 | 12:14 AM
  #10  
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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
http://www.edelbrock.com/automotive_...ous_jets.shtml

http://www.edelbrock.com/automotive_...nline-12.shtml
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