Datalog is Weird, Any Ideas?
03-19-2009, 02:15 PM
#1
Datalog is Weird, Any Ideas? I have HPT and I followed their instructions in the help files about setting up an SD tune (I'm not really wanting to go SD but trying to get the fuel tables down before messing with the MAF). So I change those settings and take the car out for a datalogging session. I get back and every cell except for some in the low MAP range have LTFTs of 2, EVERY one of them. Now I've tuned a couple GM cars before and I know that this just doesn't happen, especially with a bolt on car. I mean I'm looking at a histogram with 2s all the way across the board.
I just took my stock flash, changed the settings HPTs SD tune help article told me to and this is what I've got. Anyone have an idea as to what's causing this?
I just took my stock flash, changed the settings HPTs SD tune help article told me to and this is what I've got. Anyone have an idea as to what's causing this?
Last edited by Golf&GM; 03-19-2009 at 06:25 PM.
03-20-2009, 11:40 AM
#4
It's not the O2s, they're good. I went back to my stock tune, reread the stickies, and this time the only change I made was to copy the high octane spark table to the low octane spark table. Bingo, the O2 are switching and I'm getting a variety of lean cells in the histogram for LTFTs.
In the tune that I was having trouble with I took a stock scan, opened the HPT VCM Editor, went to the Help menu, searched for SD tune, clicked on the only result I got and followed their directions. Anyone have any idea what might have caused the LTFTs to be off?
In the tune that I was having trouble with I took a stock scan, opened the HPT VCM Editor, went to the Help menu, searched for SD tune, clicked on the only result I got and followed their directions. Anyone have any idea what might have caused the LTFTs to be off?