In Ca 91 is the highest oct available but all ca gas is just crap compared to the rest of the country. This is the Wife's ride so she'll be running the regular grade anyhow.

Keep me posted.

 

I wish I had a log on 87 octane, but I know that my KR is about identical. I will play with those modifiers and hopefully we can get some KR tables and then I could play with the decay rates some. HO HO HO I see A LOT of Santa's up this morning!!!!

 

Good morning and Merry Christmas!

As far as the kr goes, NONE of it is audible at all.

 

I am chiming in late. I logged our TB awhile back, thread is here GM tuning somewhere. Good ole rhino chimed in then too. My wifey's TB was kr on when ever you touched the freakin gas pedal. I have never messed with hers as I don't have a license to do so and she would never KNOWINGLY let me anyway. LOL

BUT since Bill is diving right in, KILL that decay like shannon points out. It is impossible to troubleshoot real kr with a slow decay rate. Since ALL TB/Envoy owners suffer kr, it leads me to believe alot of it is fake. I am not famiiar with newer pcm's either. Has GM snuck in burst as readable kr now? LOL You'd think so with that much kr. There has to be a flaw in the settings or sensor sensitvity. If that kr was TRUELY that bad, your piston tops would fall apart around 75K. Wifey's TB is at 110K. (2000 TB) Not saying we aren';t dealing with true kr, but I think the real is hidden by junk.

How many miles on the TB bill? I seafoamed Theresa's a month ago and it drives alot better, more responsive. I have wanted to scan it since the seafoam, I am willing to bet that responsiveness is less kr or less timing being taken away. Still too much kr though.

 

She only has about 25k on the odometer.
I haven't found the decay rate option yet....there are not very many areas to modify on the envoy, compared to the sierra it is empty.

 

OH SHNAP! I am looking at the tune now. UGH. The more and more I look at tunes I will always try to own pre-2004. LOL

 

Yeah In EFILive I don't have any knock tables to mess with, but I will say that GM may have done a good job with the timing in PE mode cause with 93 I have reletively none. I drove about 160 miles today and put 89 in it instead of 87, and I swear I could tell a difference in driving, definetly feels better with better gas. I STILL run stock timing tables and I did change a couple of those modifiers I was talking about today, but did not get to log any data. I did however run a Titan 4x4 from about 75-115 and actually pulled him about a car length! I might get back out a bit later to go to the store, I'll try to log some data and post some results.

 

I did a search and came up with this thread. I also just recently picked up HPT. I've been doing more scanning than any changes. Here's an 03 TB with the I6 with 75K miles on it and running 87. Anyone else playing with it, or figure out the high KR?

Here's an almost dead stop to 75 run.

 

my mother just got a envoy denali with the 5.3, will tuning help this alot more than the I6

 

just like tuning a regular silverado truck