Sorry (and I agree) - I wasn't making myself clear; What you stated is a well known phenomenon and I am very familiar with heat soak. I was jumping from subject to subject - I've hit low 5's on Hot humid days as well, although the engine of course performs much consistently better on cool or cold, dry days.

I was trying to draw a comparison between the VQ37 and the LSx engine used in the G8, and how the LSx was less affected by heat soak than the VQ of my G.

 

Al lot of us don't have ready access to a dyno, or a tuner for our car - I'd have to travel to Atlanta or New Orleans area or Houston to go get a dyno tune. And I'd want to be sure they knew what they were doing before I entrusted my engine and money to them. Which means traveling to a large metro area with a well-known tuner.

So for right now, I'll 'settle' for the Hypertech.

 

I'm not saying you should go get a dyno tune done, just go get some pulls done to see how the hypertech is doing. Tuners are hard to find but I'm sure you could find a shop with just a dyno easier than you think. Most the shops around here work on domestic american cars. After searching around the local corvette forums etc. I was able to find several shops that had dynos. Again they were not tuners but I was still able to do some dyno runs.

You say you want to know what a person is doing before you let them tune your car. I'd want the same thing if I were using an out of the box one size fits all tune. I'd want to atleast make sure the car is running correctly and actually know what all the tune is doing. And if anything you get some actual numbers out of it instead of just saying "well the butt dyno feels faster".

Sorry if it seems like I'm bashing the hypertech, I am not trying to do that in any way. They have been around a long time and have a good reputation behind them. I just think it would be nice to see some real data behind the claims. I think it would also benefit the community too.