2007 Trailblazer SS
E67 LS2 4l70e AWD
Long Tube Headers with High flow cats
Full exhaust
Ram air intake
unknown Camshaft
93 octane
Hello all. I have been picking away at my tune as time allows and it is really very good from what I can tell.
My question pertains to spark knock and knock retard.
Can some one take a look at my log and tune file I have included?
The log file has a few WOT pulls. one from 1st gear and the rest from 2nd or 3rd.
I am trying to figure out what timing it wants. To keep the knock down in the log, it seems like it only wants about 17 degrees of total advance at peak torque. This seems low to me. It is noticeably quicker with 20 or so, and I don't hear any audible knock from what I can tell. Is 17 degrees about what you all are seeing?
I tried looking for some sort of pattern to explain why i will have different knock retard readings on the same log, but i cant find any consistency.
One thing I am curious about is if its possible to have different spark advance tables for each gear change? The 1-2 shift is quite a big rpm spread and puts a lot of load on engine with the stock converter being so tight.
Thanks guys.
Rich
50 AMBIENT HIGHWAY CITY WOT.hpl Log
2 BAR OS BASE MAP, LARGE DATA INPUT, ADD, SMOOTHED ENTIRE REDUCED SPARK FOR KNOCK.hpt Tune file used to log
2 BAR OS FRESH PULL.hpt tune file with changes after log