Diablosport Forums

I've installed all the correct update, logged, calibrated and finally got "no changes needed" note from the DS logredux!!! (yeah me!) but I always get engine knock at rpm's above 5000-6000 redline! It's running 91 octane (California gas). I've read many posts that when Long term values are dialed in right, there is no need to change PE value, right? With this knocking, maybe I should??? Please advise! and Thanks!

what tune do you have installed ???

you may need to pull out a couple degrees of timing in the upper rpm range for the PE fueling....

"I've read many posts that when Long term values are dialed in right, there is no need to change PE value, right?"
In some cases... But you should check/verify just the same! You want the WOT AF ratio to fall within 12.6 - 12.8, any changes you do make in the PE fueling are instant and there is no relearn required.

the "no changes needed" is true for my car, impala ss's, and gxp's... our tunes are good at WOT....

but for you, for your truck, those run rich... so, WOT/PE fueling adjustments can be made... but, if you're getting knock already, then I wouldn't touch it...

you need to do a good WOT log... then post it up and I'll have a look....

I'll do it tomorrow, hopefully tp 100 mph on the freeway.

Now that I set the spark to -6 like you suggested, the knock is gone!!!!! I'm still not getting throttle response I'd like to see, though off the line. It revs up very nicely, but a big lagger off the line that costs alot of time. Suggestions??

if your fuel trims are in the 0 to -2 range already... not much more you can do about that....

next step up is a custom tune....