Question about open headers/exhaust

[DJCarbine]

I put a cutout on my car after the y-pipe right behind the transmisison. I was on the highway and there was no one around so I opened it up for a little bit to have some fun. I noticed when I let off the gas, there is a LOT of popping. It sounds like someone is shooting an m1 garand off under my car. With stock manifolds, is a lot of popping to be expected? Or is this a sign that I am running a bit rich.


At least im not shooting blue nawwssss flames, right?

 

[302 coupe]

thats what exhaust leaks do, they pop. Get used to it or ditch the cutout.

As a side note, advancing the timing will reduce the popping, but you may already be at the max timing for your setup.

 

[DJCarbine]

Oh, I love the popping. I just wanted to make sure I wasnt running rich or anything. On a side note, I went through a dark tunnel and my buddy said that some of the popping spat some really brief flame. This means fun time at night

 

[mfp4073]

Yeah, its just bits of unburt fuel/air that needs a little more air to burn. When it gets to the air it pops. Can happen with a leak or with open pipes like that.

 

[Spoofty]

This happened on my car once. In my case it was the float level in the rear that was too high and gas would spill over when I backed off. I set the level lower and it stopped.
Alot of FI motors do it also without a full exaust.

Mine would shoot blue flames. I had side pipe back then and I would catch it at night.