Heavy spark knock and knock retard just started, Possible causes?

[Fast355]

My stock bin or computer is the BJYL, but I do not remember what the base bin was based on.

My base bin was created by a tuner whos main focus is LT1's. I got it about 4 years ago, it has taken me that long to get time to swap the engine. In that 4 years I have been reading a lot of stuff on gearheads pages and learning.

So if the PWM is not turned on does it let the convertor just go to complete lock up?, thus putting a larger load on the engine to soon?

I will update the base bin and burn it, and to a test log/drive

Thanks for your feedback Dave

PWM TCC is a terrible strategy, I mostly disable it as well.

[Sledhead2]

Again what it the effect on or off?

does convertor go full lock up with it off?

reading on line says with it on, it slowly goes to full lock up?

[dave w]

PWM TCC is a terrible strategy, I mostly disable it as well.

Everyone tunes differently.

Starting over with a stock tune, with the bare minimum of changes ( for example: fuel injector flow for 18 psi fuel pressure regulator) can solve many problems.