Lowering AFR
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Junior Member
Joined: Dec 2006
Posts: 39
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Car: Firebird Formula 350
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.73
Lowering AFR
I have a 89 350 TPI. I keep reading about lowering your air to fuel ratio, especially when running nitrous, to say around 11.5.
I have a wideband 02 sensor so that I can track my AFR. When I try to lower my AFR so that it runs closer to 11, I cant get it away from the 14.6 baseline. I have an adustable fuel pressure regualtor, and I have put in larger fuel jets for my nitorus setup. Yet, even when I hit the nitrous, the AFR is still around 14.
Is this simply because without a chip tune, the AFR really cant be altered? Should I put in even larger fuel jets for the nitrous? I would like to run around 11.5 AFR when hitting nitrous.
Thanks
I have a wideband 02 sensor so that I can track my AFR. When I try to lower my AFR so that it runs closer to 11, I cant get it away from the 14.6 baseline. I have an adustable fuel pressure regualtor, and I have put in larger fuel jets for my nitorus setup. Yet, even when I hit the nitrous, the AFR is still around 14.
Is this simply because without a chip tune, the AFR really cant be altered? Should I put in even larger fuel jets for the nitrous? I would like to run around 11.5 AFR when hitting nitrous.
Thanks
Supreme Member
iTrader: (7)
Joined: Jul 2000
Posts: 2,047
Likes: 2
From: Prince George, BC, Canada
Car: 89 GTA
Engine: 5.7L Supercharged
Transmission: T-56
Axle/Gears: Moser 9" 3.70
Re: Lowering AFR
Probably just need bigger jets, I don't see the computer affecting anything when your at WOT.
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