Nitrous jetting question
Thread Starter
Instructor
Joined: Aug 2000
Posts: 177
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From: Toledo,Ohio,USA
Nitrous jetting question
I am running a little fuel rich when the nitrous is engaged. Rather than going smaller on the fuel jet, wouldn't I make more power by increasing the nitrous jetting. I'm using the Edelbrock 70002 q-jet performer kit(100hp max) at the 100 hp jetting 59 no2 and 65 fuel. I see that Edelbrock shows the solenoids that come in this kit will support 150hp. Is it possible to put to much nitrous to the (preformer)plate?
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I am running a little fuel rich when the nitrous is engaged. Rather than going smaller on the fuel jet, wouldn't I make more power by increasing the nitrous jetting. I'm using the Edelbrock 70002 q-jet performer kit(100hp max) at the 100 hp jetting 59 no2 and 65 fuel. I see that Edelbrock shows the solenoids that come in this kit will support 150hp. Is it possible to put to much nitrous to the (preformer)plate?
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Factory jet settings are ridiculously rich. Most guys who know anything about nitrous run the jets square (both jets the same size) in a plate at 5.5-6.5 lbs of FLOWING fuel pressure.
I would suggest either reducing the fuel jet or increasing the nitrous jet until the plugs look good. Remember if you are making more power to pull more timing out of the motor. Also make sure your gas is high enough octane to support the extra power.
Make small steps and keep an eye on the plugs.
I would suggest either reducing the fuel jet or increasing the nitrous jet until the plugs look good. Remember if you are making more power to pull more timing out of the motor. Also make sure your gas is high enough octane to support the extra power.
Make small steps and keep an eye on the plugs.
Last edited by 69 N.O.X. RATT; Jun 9, 2007 at 10:49 AM.
Thread Starter
Instructor
Joined: Aug 2000
Posts: 177
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From: Toledo,Ohio,USA
With the nitrous in, I'm reading about 10.2 to 1 air fuel ratio, I'm shooting for 11.5 to 1 which I feel still should be very safe. From what I've read on the internet, they talk about reducing the fuel, which would get me to the right mixture. I just thought increasing the nitrous jetting to the correct mixture would result in more horse power, than reducing the fuel.Thanks for the replys.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
With the nitrous in, I'm reading about 10.2 to 1 air fuel ratio, I'm shooting for 11.5 to 1 which I feel still should be very safe. From what I've read on the internet, they talk about reducing the fuel, which would get me to the right mixture. I just thought increasing the nitrous jetting to the correct mixture would result in more horse power, than reducing the fuel.Thanks for the replys.
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
DO NOT TUNE A NITROUS MOTOR WITH A/F RATIO METERS.......PERIOD !!!
On a lot of the those A/F ratio systems nitrous skewers the readings. The ONLY way to safely tune a nitrous engine is to READ THE PLUGS !!.
I don't mean to be so opinionated on this; but I have heard too many people blame nitrous for an engine failure when it was lack of understanding or attention to detail that caused the problem.
I ran over 500 lbs of nitrous through my 454 last year and never nipped a plug....most of it a 250 hit and above. I am not trying to brag only pointing out that nitrous can be run safely in large doses for extended periods of time.
If you do not know how to read a nitrous plug do a search and you will find lots of info.
On a lot of the those A/F ratio systems nitrous skewers the readings. The ONLY way to safely tune a nitrous engine is to READ THE PLUGS !!.
I don't mean to be so opinionated on this; but I have heard too many people blame nitrous for an engine failure when it was lack of understanding or attention to detail that caused the problem.
I ran over 500 lbs of nitrous through my 454 last year and never nipped a plug....most of it a 250 hit and above. I am not trying to brag only pointing out that nitrous can be run safely in large doses for extended periods of time.
If you do not know how to read a nitrous plug do a search and you will find lots of info.
Thread Starter
Instructor
Joined: Aug 2000
Posts: 177
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From: Toledo,Ohio,USA
Thanks for the information guys. 69 NOX RATT you were right about not trusting a air fuel meter when using nitrous, here is a quote from a article I just read.
"If tuning with a wideband O2, ZEX cautions that the higher the ratio of nitrous power to engine power, the less accurate the O2 sensor will be. That's why most hard-core guys look at the plugs and exhaust-gas temperatures. Plugs don't lie."
Now they did say the higher level of nitrous you use the less accurate the meters become, Since I'm only using a 100hp shot hopefully its not way off. I did read several good articles on nitrous plug reading that I will be using. Rich or lean will be hard to call because my plugs are not easy to pull and finding somewhere I shut the motor off after a full throttle run, and coasting to somewhere I can pull the plugs will be tough, plus I'm still using unleaded which appears to make the plugs a little harder to read.
I'm really just want another tenth and a half, the last time at the track I ran 12.15 at 115 with street tires and full exhaust, I just want to break into the 11s and tweeking the nitrous seems the easiest way to get there.
"If tuning with a wideband O2, ZEX cautions that the higher the ratio of nitrous power to engine power, the less accurate the O2 sensor will be. That's why most hard-core guys look at the plugs and exhaust-gas temperatures. Plugs don't lie."
Now they did say the higher level of nitrous you use the less accurate the meters become, Since I'm only using a 100hp shot hopefully its not way off. I did read several good articles on nitrous plug reading that I will be using. Rich or lean will be hard to call because my plugs are not easy to pull and finding somewhere I shut the motor off after a full throttle run, and coasting to somewhere I can pull the plugs will be tough, plus I'm still using unleaded which appears to make the plugs a little harder to read.
I'm really just want another tenth and a half, the last time at the track I ran 12.15 at 115 with street tires and full exhaust, I just want to break into the 11s and tweeking the nitrous seems the easiest way to get there.
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
At a minimum make your run and pull at least one plug to look at; then maybe go up the next size nitrous jet....make another run and take a look at the plug (must a be brand new plug)
Reading nitrous plugs for the average sportman guy who is not trying to squeeze every last bit of e.t. out of his set up is easy to do. Since you are running crap gas the biggest fear is running into detonation, you would have to be really far off of your tune to hurt it by being too rich or lean at the 150 hp level. A lot of guys think that running lean is the big killer of a nitrous motor, and it is not good, but running too fat is just as bad. The fuel will get under the top ring under the intake valve and when ignited it will peel the top of the piston off.
Reading nitrous plugs for the average sportman guy who is not trying to squeeze every last bit of e.t. out of his set up is easy to do. Since you are running crap gas the biggest fear is running into detonation, you would have to be really far off of your tune to hurt it by being too rich or lean at the 150 hp level. A lot of guys think that running lean is the big killer of a nitrous motor, and it is not good, but running too fat is just as bad. The fuel will get under the top ring under the intake valve and when ignited it will peel the top of the piston off.
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