Time to address this issue I'm having with exhaust backfiring.
I'm running 5lbs of boost on my little 289 with a Pro-Flo Efi system. I'm running the stock paxton FMU 12:1. After doing the calculations I should be running a 8:1 FMU. I believe here lies my problem. It's definitely running rich with the 12:1 FMU.
It only backfires at high rpm's (near the rev limiter) as soon as I push the clutch in she lets out a hell of a boom out the exhaust. My buddy behind me said blue flames went shooting out my tail pipes. Sounds way to rich to me. Now this only happens at high rpm, when i press the clutch in.
My timing is right on as per Edelbrock recomendations, my plugs look good. so i'm thinking it's my FMU. Do you all Agree I'm going in the right direction?
Thanks
I'm running 5lbs of boost on my little 289 with a Pro-Flo Efi system. I'm running the stock paxton FMU 12:1. After doing the calculations I should be running a 8:1 FMU. I believe here lies my problem. It's definitely running rich with the 12:1 FMU.
It only backfires at high rpm's (near the rev limiter) as soon as I push the clutch in she lets out a hell of a boom out the exhaust. My buddy behind me said blue flames went shooting out my tail pipes. Sounds way to rich to me. Now this only happens at high rpm, when i press the clutch in.
My timing is right on as per Edelbrock recomendations, my plugs look good. so i'm thinking it's my FMU. Do you all Agree I'm going in the right direction?
Thanks