nitrous afr
Apr 2, 2009 | 11:42 PM
#3
This guy is a nitrous tuner for NOS and travels around tuning nitrous cars. He also has nitrous classes. His name is Monte Smith.
" I know the NOS suggested jetting is larger on the fuel and that will be dead rich. Will it run? Sure. Will it hurt anything? Likely not at these low HP levels. Are you getting near what you should from the kit? Absolutely not. It has been preached for years that "rich is safe" and most guys tend to believe it, but that could not be farther from the truth. Excess fuel just beats the crap out of the rings. 99% percent of nitrous related engines failures are from too much fuel, too much timing, or both. It is EXTREMELY rare to burn a motor by getting the nitrous system too lean. Barring a mechanical malfunction or an extremely bonehead tune up change, that is nearly impossible to do.
As far as A/F numbers, for some reason, people seem to think nitrous motors need to run way richer than they do in N/A form...again, not true. As an example, if your motor makes best power N/A at around a 13:1 A/F ratio, a moderate nitrous tune (less than 250 hp) will be fine at that same 13:1 A/F ratio, provided you get the timing correct. Although I would not suggest you go straight to these numbers, I run the 632 in the drag radial car, at about 13:5.1 A/F ratio, with about 600hp worth of spray. The Pro-Mod car also runs over 13:1.1 with over 900hp worth of juice. Anything in the 9,10, or 11 range, on spray, is DEAD RICH."
Heres more off his site http://smotherssupercars.com/nitrousclass.html
" I know the NOS suggested jetting is larger on the fuel and that will be dead rich. Will it run? Sure. Will it hurt anything? Likely not at these low HP levels. Are you getting near what you should from the kit? Absolutely not. It has been preached for years that "rich is safe" and most guys tend to believe it, but that could not be farther from the truth. Excess fuel just beats the crap out of the rings. 99% percent of nitrous related engines failures are from too much fuel, too much timing, or both. It is EXTREMELY rare to burn a motor by getting the nitrous system too lean. Barring a mechanical malfunction or an extremely bonehead tune up change, that is nearly impossible to do.
As far as A/F numbers, for some reason, people seem to think nitrous motors need to run way richer than they do in N/A form...again, not true. As an example, if your motor makes best power N/A at around a 13:1 A/F ratio, a moderate nitrous tune (less than 250 hp) will be fine at that same 13:1 A/F ratio, provided you get the timing correct. Although I would not suggest you go straight to these numbers, I run the 632 in the drag radial car, at about 13:5.1 A/F ratio, with about 600hp worth of spray. The Pro-Mod car also runs over 13:1.1 with over 900hp worth of juice. Anything in the 9,10, or 11 range, on spray, is DEAD RICH."
Heres more off his site http://smotherssupercars.com/nitrousclass.html
Apr 3, 2009 | 08:11 AM
#5
This guy is a nitrous tuner for NOS and travels around tuning nitrous cars. He also has nitrous classes. His name is Monte Smith.
" I know the NOS suggested jetting is larger on the fuel and that will be dead rich. Will it run? Sure. Will it hurt anything? Likely not at these low HP levels. Are you getting near what you should from the kit? Absolutely not. It has been preached for years that "rich is safe" and most guys tend to believe it, but that could not be farther from the truth. Excess fuel just beats the crap out of the rings. 99% percent of nitrous related engines failures are from too much fuel, too much timing, or both. It is EXTREMELY rare to burn a motor by getting the nitrous system too lean. Barring a mechanical malfunction or an extremely bonehead tune up change, that is nearly impossible to do.
As far as A/F numbers, for some reason, people seem to think nitrous motors need to run way richer than they do in N/A form...again, not true. As an example, if your motor makes best power N/A at around a 13:1 A/F ratio, a moderate nitrous tune (less than 250 hp) will be fine at that same 13:1 A/F ratio, provided you get the timing correct. Although I would not suggest you go straight to these numbers, I run the 632 in the drag radial car, at about 13:5.1 A/F ratio, with about 600hp worth of spray. The Pro-Mod car also runs over 13:1.1 with over 900hp worth of juice. Anything in the 9,10, or 11 range, on spray, is DEAD RICH."
Heres more off his site http://smotherssupercars.com/nitrousclass.html
" I know the NOS suggested jetting is larger on the fuel and that will be dead rich. Will it run? Sure. Will it hurt anything? Likely not at these low HP levels. Are you getting near what you should from the kit? Absolutely not. It has been preached for years that "rich is safe" and most guys tend to believe it, but that could not be farther from the truth. Excess fuel just beats the crap out of the rings. 99% percent of nitrous related engines failures are from too much fuel, too much timing, or both. It is EXTREMELY rare to burn a motor by getting the nitrous system too lean. Barring a mechanical malfunction or an extremely bonehead tune up change, that is nearly impossible to do.
As far as A/F numbers, for some reason, people seem to think nitrous motors need to run way richer than they do in N/A form...again, not true. As an example, if your motor makes best power N/A at around a 13:1 A/F ratio, a moderate nitrous tune (less than 250 hp) will be fine at that same 13:1 A/F ratio, provided you get the timing correct. Although I would not suggest you go straight to these numbers, I run the 632 in the drag radial car, at about 13:5.1 A/F ratio, with about 600hp worth of spray. The Pro-Mod car also runs over 13:1.1 with over 900hp worth of juice. Anything in the 9,10, or 11 range, on spray, is DEAD RICH."
Heres more off his site http://smotherssupercars.com/nitrousclass.html
Apr 3, 2009 | 09:42 AM
#7
basically from what i understand is that when spraying a smaller shot, if your running your wot afr at 11.4:1 when not spraying then when spraying you should see similar afrs on the spray. i would think its ok. do not go 13:1 with boost and spray!
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Apr 3, 2009 | 12:46 PM
#8
I just got my wide band in and at WOT it's around 9.5 to 9.8 no spray. I spoke with my friend who I got the truck from and he said the tuner set it rich for nitrous. (Magnacharged LQ9). I can only assume the tuner thought this would be a dry shot but it has an HSW wet plate on the truck. Thoughts??? I plan on running a 50 shot.
Apr 3, 2009 | 04:14 PM
#10
I just got my wide band in and at WOT it's around 9.5 to 9.8 no spray. I spoke with my friend who I got the truck from and he said the tuner set it rich for nitrous. (Magnacharged LQ9). I can only assume the tuner thought this would be a dry shot but it has an HSW wet plate on the truck. Thoughts??? I plan on running a 50 shot.