need help with to much knock on my 2008 vettte running r08

[carmos]

hi all,i am getting to much knock i think with the latest predator tune.i am running the 91 oct tune using chevron premium...i have taken 3 degrees off the low setting and mid setting in the spark table and 1 degree from the high table...i am attaching my latest log with hopes that some one can help...i am running the newest r08 crom the predator.this log is from stand still to redline in 1st and 2nd gear...

[carmos]

[mikel]

Have you tried fuel from an entirely different station?

[06MonteSS]

ewww...

yeah, your WOT is ugly from 3700 rpm to 6000....

have anything underneath the car rattling/clanging, like the exhaust hitting/tapping something, or heat shields??

bad gas maybe??


try adding in a little extra fuel at WOT in that rpm range...

go to the Power Enrichment menu and adjust the fueling for the rpm range that covers the 3700rpm - 6000rpm area, and add +1% fueling to it...

press the center button to save the change, press ESC a few times till it asks you to "Install tune?"...

select YES to install the modified tune...

put on some miles, then do a new WOT log and see how things look..

[carmos]

Have you tried fuel from an entirely different station?

hi mikel,yes i have to differnt chevrons and one mobil all with similar results.

[carmos]

ewww...

yeah, your WOT is ugly from 3700 rpm to 6000....

have anything underneath the car rattling/clanging, like the exhaust hitting/tapping something, or heat shields??

bad gas maybe??


try adding in a little extra fuel at WOT in that rpm range...

go to the Power Enrichment menu and adjust the fueling for the rpm range that covers the 3700rpm - 6000rpm area, and add +1% fueling to it...

press the center button to save the change, press ESC a few times till it asks you to "Install tune?"...

select YES to install the modified tune...

put on some miles, then do a new WOT log and see how things look..

hi monte no,the exhaust seems soild.i will give ur suggestion a try in a few minutes and get back with u.thanks

[mikel]

Try adding about 5% fuel at WOT across the rpm ranges and re log to see if that helps.