Have a Blueprint LS3 - 408 - makes 595HP engine almost 400 at the wheels - running a PSI Harness and a 6L80e trans - full length headers into dual 3'' stainless exhaust with "X" pipe and 3'' BORLA ATAK mufflers. Engine has about 500 miles or so - oil changed since break in also installed new plugs and Scott's Performance wires.

Question that I have - when accelerating at roughly low to mid throttle input the engine wants to pop through the exhaust - this is especially noticeable right before it shifts. Been to the tuner twice and he states it is not running lean and that it is impossible to tune it out 100%

I'm at a lost here - thoughts suggestions.

 

Here is the Blazer

 

My guess is the popping sound is unburnt fuel getting burned in the exhaust. The tune might be a bit rich but that is safer than lean.

 

Find another tuner. He’s dead wrong. Beautiful ride sir!

 

Awesome ride! Sounds like a possible lean spot in the tune to me. I agree let someone else check the tune and make sure they are using a wideband.

 

Here's a pic of a plug I pulled .... not sure if that tells anyone here something

Have begun looking for another tuner

 

It looks like it's been fouled but tried to clean up. I'd put new plugs in it before someone else tunes it.