TNT Dyno graph inside, need help...
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TECH Apprentice
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From: Lincoln Nebraska
TNT Dyno graph inside, need help... Ok, guys wondering if anyone know why the car would dip down at 3900 revs like in the pic. I'm stilling sorting the Atap data and will add that later.
Tom
Tom
Re: TNT Dyno graph inside, need help... Looks like that is where your AF ratio starts to get a little lean for nitrous. I would add fuel between 3500 and 4200. You probably pulled a fiew deg. of knock retard in that area from detnation. If tuning dont help i would lean twards checkng your fuel pressure and see if it drops when you hit the nitrous and causes the rise in your AF ratio in that area. You have a stock pump?
Nice #'s BTW! What mods other tan in the sig if you dont mind me asking?
Nice #'s BTW! What mods other tan in the sig if you dont mind me asking?
Thread Starter
TECH Apprentice
iTrader: (5)
Joined: Nov 2001
Posts: 320
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From: Lincoln Nebraska
Re: TNT Dyno graph inside, need help... Graph shows lean Atap data says .930-.945 for O2's. Got 3.6 knock and cut the timing to 17.5. Thats gotta hurt. You think running a 100 octane would of kept it from happening.
Mods, uhh CC 212/218 Cam and LS6 intake...
Tom
Mods, uhh CC 212/218 Cam and LS6 intake...
Tom
TECH Fanatic
Joined: Feb 2002
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From: Friendswood TX
Re: TNT Dyno graph inside, need help... Is it true knock or false? If it still does it with the 100 octane, I think its false. Could your y-pipe be hitting the floor? My in my macs did. Good luck.
TECH Junkie
Joined: Aug 2002
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From: Fort Collins, CO
Re: TNT Dyno graph inside, need help... It looks as though you're running lean at about 3800, so you're having timing pulled. Try to smoothen that A/F curve out with some tuning or add some good octane booster. I was pretty suprised at what a bottle of the NOS Race formula did for my car.
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Re: TNT Dyno graph inside, need help... I would trust the wide band reading (on your chart) Not the o2's and it shows you going lean in that area compared to the rest of the run. And that is where you have a problem. Yes try 100 octane (or higher) if that helps you know it's True knock. I think it is anyhow by looking at your graph. If it doesnt help i would still look at fuel pressure. Dont know what to tell you except that is where i would start. The KR if true just shows you are lean weather it is low fuel pressure or or tuning related. The only reason i think it is true is because if it was false KR you probably would have went a little rich in that area as well as loose timing.
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