I just got a Trailblazer and I havent found any dyno numbers on them so I want to get one. Preferably a dynojet for the big numbers, I only know of places with a mustang dyno.

 

There used to be some dyno graphs at Hypertech a couple weeks ago but now they are gone and there is a blank spot where thay used to be at http://www.hypertech.com/dynogmtrk.html
Either Hypertech was off and thats why they are removed. Or GM uderrates the 4.2 because it was putting like 270 to the wheels before Hypertech and I think 302 after. Thats more than a stock camaro

 

it feels strong but no way is it dynoing that high. I would put it at about 250. maybee more if break in helps I only have 500 miles on it. my firebird has 365 at the wheels and the truck doesn't even feel half as fast.

 

They're rating those at 275 at the flywheel, so 270rwhp sounds a little far fetched, but I guess they could always be underrating it. Keep in mind though, those trucks will weigh about 1500 pounds more than a Firebird too.