New c5 Dyno Tuned questions

[JoryJohnson23]

Long story short. I've wanted a c5 for a while. Hard to find where I live. Earlier this summer I came across one. Beautiful, clean, fast, and in my price range. So I went and looked at it, the owner started it up and I instantly bought it. Didn't need a test drive because I could tell this was everything the owner described.. I've been extremely happy for the past 2 months and put almost 8k miles on it. I was obviously very excited about the purchase and left a bunch of paperwork for the cars mods at the dude's house. (He lives 700miles away and since I lost his number) but I did screenshot the craigslist add and the add showed the

List of modifications :
315 gears from 273 factory
Ported and polished heads
Vararam intake
SS long tube headers
Muffler delete (straight)
Texas speed cam 212/218
2200 stall converter
Dyno tuned


My question is how do I know it's Dyno tuned? And in everyoe else's opinion what other mods should I go for next?

I got 295/35r18 NT05 on the back and the concrete was damn and she broke the tires loose at 90mph


Also the passenger side air conditioner only slightly works. I was thinking blend door actuator but it will change to heat and back to coldish so it maybe getting hung up? What's best way to check this?

 

[Hib Halverson]

There is no easy way to determine conclusively whether and engine has been "dyno tuned".

One way to tell is to compare the current calibration in the ECM to a stock cal. You'd need HPTuners for that.

That said, if the car as-modified drives nicely, then you can assume that's it's been properly calibrated or "tuned".

As for additional modifications...if you're looking for more significant improvements, it would come from a displacement increase or supercharging. If you are looking for just a reliability/durability improvement, pull the engine and replace the stock nodular iron crankshaft with a forged steel unit and replace the pistons with forged units.

If the car spins the tires at 90-mph, buy new tires.

Can't help on the HVAC problem other than suggesting you research the Factory Service Manual. I don't have experience working on the HVAC because I've never had any trouble with my C5's system so I've never worked on it.