TariqEvo

So, i just installed a 3-port gm ebcs, and I pretty much got 3rd gear nailed down, little work left.
but problem I am facing is that 4th gear pulls get me high knock even shifting 3rd to 4th.
i have checked afrs, load and timing and i dont see what is causing the knock.
I have attached a 3rd gear pull going into 4th gear. and also a 4th gear pull itself.

TariqEvo

Forgot to mention, I am on speed density

TariqEvo

have colored out where the knock is

Abacus

iTrader: (9)

If its stock compression, your timing is a bit high across the board. Even if you have Ethanol/race fuel. Its better to prevent knock then it is to try and stop it once its happening. Look over the "timing" thread and others and gather some more information.
These engines don't need a lot of timing to run well.

TariqEvo

it's knocking at 5* of timing at peak boost. how low of timing should I go before the EGTs go high?

TariqEvo

I managed to fix this, apparently it was both rattles and real knock which contributed,
then also tuned out the afrs and smoothened both fuel and timing maps