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Don't know if this helps, but...

I let a "performance shop" install my first cam, and my car had knock everywhere. Some of it was real because the "tuner" dialed in 28deg of WOT advance. Even...

Thanks Bill...I knew it was something stupid.

Here is a log, config, and a tune. The tune might not be the exact one used for the run, but pretty close.

I knew I had too much timing at WOT, and was trying to see where it was knocking so I...

I've removed my MAF, and now when I look at either the Advance or KR Hysto, the Cylinder Airmass axis is showing an incorrect value, roughly half of what it should be. The timing is obviously being...

What version of HPT are you using?

Gerry

I can tell you one thing that doesn't work -- doing a MAF only tune and not setting it to run off MAF only. Not that some moron would charge me $400 to do that to my cammed car:banghead:

I've run...

Anyone know what all these patterns mean or have a suggestion where I can look?

Gerry

You might want to post a log showing the problem and your tune.

You can log many, many PIDs for timing retard and see what system is pulling it. At moderate throttle, your timing shouldn't be...

uncluttered :bigshock:

I remember. You're like Batman...I know you read this forum and I wouldn't have to signal you again. This is just a more appropriate place for my post than a GTO forum.

Here's the stock file. ...

Patterns...Pattern A, B, X, Y, Z. Can someone help me with what these are and if I should care? I'm assuming that at least one of these patters is for when I use "tow mode", but what pattern goes...

PID List > Engine > General

Gerry

ttt

My LS2 has a pressure switch that prevented my A/C from running when it was hot...as in stop & go traffic 95+. If your compressor kicks on then immediately shuts off, that might be the problem. See...

ttt

You're assuming that the trim values are stored in the tune file? You really think they would bother reading those?

Gerry

I'm also sure there are settings we don't have access to.

I'm not interested in settings, but whether these mystery trims exists, what they are, and if they are reset with a tune flash.

Thanks,...

Thanks for the input. I've seen mine reset with a flash.

I'm hoping someone who knows for sure will chime in instead of guessing or repeating heresay, especially about these supposed hidden...

I've heard this same general statement many times, and I'd like to know how many of these mystery "trim tables" the LS2 has. Idle trims??? Startup trims??? Part-throttle trims? lol



First...

Well, that sucks. I don't have any further suggestions -- if the compressor is still engaged, then it just sounds like an efficiency issue.

Gerry

Sounds like you have too much startup airflow.

Are you running a wideband? If so, can you upload your config? Your VE and MAF tables are stock, so I'd start by tuning those. Your AFR can't be...

My guess is that you have TOO MUCH pressure in your A/C system.

My GTO did that, and I found it was overcharged by the guy who installed my cam. It would work fine until I hit stop & go traffic,...

If your knock was reduced with E85, wouldn't that be an indication that it was real knock? I mean if it was false knock, putting in E85, racing gas, or 200 (lol) octane won't reduce it, right
...

I have the same problem with my LS2 GTO. I have had KR on every log for the 1.5 years I've been tuning it. At one point, I set the timing tables back to stock and mixed some racing fuel with Xylene...

I'd ask you what is on their minds, but I'm 45 and probably already know the an$wer. ;)

Gerry