I installed long tubes and high flow cats on my truck a couple of weeks ago. I haven't had time to get the a/f checked. But, it smells like it is running richer. Anyone check their a/f before and after a header install?

 

should be leaner after the install

 

There is a difference between WOT A/F ratios and parked a/f ratios. j/k

Unless.....? your implying that your nose-a-meter is located at the right rear tire area during a WOT blast..

Rich

 

Rich,

With the rear window open. After I let off at WOT, it smells rich. It also smells richer at startup.

 

I was told just the opposite and my truck proved it.

A/f before headers 11.5.

A/f after..........low 10's and complately dropped off the scale in the mid range.

Headers and high flows were the only thing changed

 

My mustang leaned out 1 full point when I installed l/t's that is why I posted that.

 

Every time I've added LT's on a Lightning it richens the A/F; total opposite of what you'd think.

Jody

 

naturally aspirated and forced induction engine have different properties when it comes to headers?

 

Thanks tallimeca and camcojb.

Sal is coming to town the weekend of March 19th, looks like I'll be getting another dyno tune.