STL Mark

I know it's an out there, but 2010 Grand Sport (LS3), M6, vert, bone stock, 3rd owner, 68,000 miles and achieved 426 rwhp on a 2 different dyno pulls. Maybe they make more power they older they get.

MBishop090

Bone stock? That's one of them factory freaks. Haha. Ya 408 was a lot lower than I expected. But I guess the autos usually run about 10 hp less Plus the temp and humidity played a big factor on it that day. I'm goin back this winter to see if there's any difference.

Steve Haefner

haha which dyno, there are a few in the area that read high!

STL Mark

I didn't see any ice packs laying around, or guys giving ******** to sensors. It was just a club day. Cars on an off the dyno all day long. Everyone basically pulled what they expected - except me. I've been to a few tuners here in town. I'd say this shop is better than most, but I'm no expert. Maybe an expert can glean some hidden info off the dyno sheet. It was a perfect spring day weather wise. Like I said, they probably did 15 or 20 cars that day.

All the best.

Suns_PSD

It would be nice to have another data point.

A 'factory freak' as they say is good, for an extra 10-17 rwhp, not 40! Not going to happen.

STL Mark

Agreed. I'm not a dyno chaser these days, one more data point would be excellent. But, I will be going back for baseline and mods with tune at some point - possibly.

As for factory anomaly, I've had this discussion with a number of people. Not to take the thread too far off-topic, but I do agree it's unusually high for what appears to be a bone stock car. I have the dealer service records from new. Every oil change, wiper blade - everything, and done at appropriate intervals. The records indicate 100% dealer serviced as far as I can tell. Visually, the engine compartment is perfect and nearly new looking. I'm not sure how all 68,000 mile 2010 Vettes are - but even things like small factory paint marks on hoses, bolts, etc. appear unmolested.

I even thought that maybe a previous owner had a LS3 crate engine installed. Don't they make over 500hp? The paint is also near perfect IMHO with only very minor road rash. So, I also pondered the idea that the car was wrecked and thus received a new engine and paint. But the Carfax is clean and normal looking for a 7 year old car.

Don't misunderstand though, I'm not bragging and you won't find the car for sale anytime soon. It's just weird, but in a good way I guess. It's a really nice car which is why I bought it.

Like I said, I've had this discussion with a number of people and listened to a number of sceanarios, but it seems (I guess) that the only way to know anything for sure is to tear in to it...and that's not going to happen at this point.

Short version - it's weird, in a good way.

2L8LUZ

I've had better results with cars/trucks modded or not making more hp/tq at 100k than freshly built 0 mile motors as a dyno operator period...