My car has only run with leading plugs since the new motor and single turbo were installed.

I get horrible gas milage and lots of smoke, I want to run with all four plugs now.

I tried installing trailings and the car ran like ****. No power, hesitation and it felt like constant detonation.

I removed the trailings until I learn what needs to be adjusted on my LT-8 to run all four plugs.

The builder installed anti-dets, the reasoning was since 90% of detonation occurs in the trailings, so it would be safer to run without them. That was last summer.

So, what do I need to change to safely run all four plugs? I have a wideband and the car is currently tuned alright.

Also is it true I am missing appox. 10% rwhp by not using the trailings?

Thanks for any help

 

Anyone?