First off he said he had NO PULLEY.
Second Owning a SuperFlow Chassis Dyno and Running it every day except Sunday, I question some of the numbers that are posted, I don't question anyones integrity but the Dyno they are using.
I had a Cobalt Dyno Day this past Spring we dynoed 16 SS balts all of which were modded varying degrees all of which thought they had more power than they really did.
I don't think there was one car over 245 hp, Seems like the more parts they had the less power they made anywhere from 202 to 225 was the average.
Now you might say My Dyno is Low, It's NOT, It is Just Accurate!
Every car that rolls off my Dyno can back up the power at the track with Power to Weight Math for MPH in the Quarter.
Third even if you can lay down big numbers on a Short Dyno Pull the car Wont carry the Power to the finish line and Won't run the numbers at the track, has to do with heat soak from overspinning the Tiny supercharger.
The only shot you have of making more than 250 whp consistantly with that little blower is Nitrous
If you think you make 266 go to the track and lay down some 106 mph runs.
My Cobalt has 240 wheel and goes 13.8 103-104 MPH
I built Cobalts for Customers that means they have to be Reliable under all conditions, What you do with your car is Your Business and Your Money.
We have 400 WHP cobalts rolling out the door.
If you going to call me a Liar you better bring bigger guns.
Ted.