Hondata

Dear Hondata and spunkster and all users,

I would like to know relationship between knock control value and knock ignition limit table.

For my car i m try to do custum tune and i got some issues.

around 5500 rpm knock value increase so quickly. top i saw 0.80 and there time car cut down the power.
i check the knock ignition table, there is very low ignition in exactly 5500 rpm. So i moved down the value there actually i made same as 4000rpm, then i log it and saw 0.68 max.

So i would like to know the point which is knock ignition table affects knock control values. Am i right?
Which point do i have to carefully lookafter?
Whats the normal and high value of knock control?

I am interested in knowing this too...

Lowering the knock ignition limit values will lower the ignition timing. So if you have knock it will lower the knock control value. There is a limit to the effect of the knock ignition limit table if you raise it, which timing will not go over MBT values for that load/rpm.

BTW it is common for the knock control to go up sharply at 5500 rpm from exhaust back pressure. The CRV/Si turbo helps a little bit.

Hondata wrote: Tue Jun 30, 2020 3:33 pm Lowering the knock ignition limit values will lower the ignition timing. So if you have knock it will lower the knock control value. There is a limit to the effect of the knock ignition limit table if you raise it, which timing will not go over MBT values for that load/rpm.

BTW it is common for the knock control to go up sharply at 5500 rpm from exhaust back pressure. The CRV/Si turbo helps a little bit.

Thank you. I have notice Knock control going up from 55 to high 60's when going 5K RPM's
So is it ok to think that lowering ignition limit table values will help knock count and help knock control stay lower?

If you lower the knock ignition limit table where the knock control increases, then the ignition timing is going to end up the same but the knock control will be lower, so that will be better when you shift to lower rpm.