nitrous afr
Apr 3, 2009 | 07:53 PM
#11
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.
Got his AFR around 11.0ish. but i think its too late for the engine.
lemme know if you want a real tune
Apr 3, 2009 | 08:58 PM
#12
Hopefully i'll have hp tuners soon. Can't wait to lean it out a little and see what kind of a difference it makes. It cut's out in the morning when it's cold but has never cut out WOT.
Apr 4, 2009 | 03:33 PM
#15
Sometimes its not when people bring you junk, things are not done right, too small injectors, too small fuel pumps, maf too small and you they expect you tune it when you cant. It gets old after a while then you get to tune stuff like this ( https://www.performancetrucks.net/fo...&highlight=964 ). Tuning cars like this is fun!
Apr 5, 2009 | 06:41 PM
#16
Registered User
Joined: Mar 2009
Posts: 14
Likes: 0
From: Berkeley California
Get that thing down to the 11.2 to 11.7 range and it will make more power and be safer on the engine!!!!
Apr 6, 2009 | 03:20 PM
#18
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 6, 2009 | 07:26 PM
#19
go to yellowbullet.com and do a search of monte smith. or google his name with nitrous. he does classes at $500 a head. On the dyno I used to run ive seen motors lose power going from mid 12s to low 11s on nitrous
Apr 6, 2009 | 10:05 PM
#20
I'd love to go to his seminar (I think it's actually $100 or so less if you make a reservation) and he's coming to Columbus, but my schedule sucks.
I've hit high 12's on the initial hit and it's stayed there for a few seconds until it richens up, and I haven't had any ill effects, still has 170 compression on #7. But this is on 93 and mid/lower 20's timing on a measly 100 shot.