had a quick question...so far i have the 5/16th spacer, JWT popcharger, and ture dual exhaust. Lately I have been hearing a little quiet "thump" in the exhaust when idling. It will just idle and thump...idle...and then 5 or 6 seconds later...thump again.

Is this a sign that my AFR is off after all the breathing mods? In need a of a tune?


thanks!

 

What kind of thump? Is it the sound of 2 parts physically hitting each other? Or is it a 'miss' that you hear coming from the exhaust?

Video would help.

 

your probably running lean.

 

You are probably just hearing compression waves colliding in the chambers, ports, and collectors. These sounds are "tuned out" in a factory exhaust (as are decel popping, etc). The more you open up an exhaust, and the fewer restrictions and sound deadening points you have, the more of these natural engine sounds will come through.

Probably normal. But maybe have a tuner listen to it just to be sure.

 

Hey man where you been lately??? Good to see you bro....

I am FI Finally..

To the OP, my bad for spamming your thread

 

I been around. Busy with work mostly, and also in the middle of selling a house and trying to move. I just haven't had time for the forums lately. Whatchoo been up to?

 

thanks for the info guys

 

it's prolly just a backfire or sum'n.