my brother has a 1998 trans am with an air lid and a cut out why does it spin the tires alot more with the cut out closed than it does open?

 

That's an easy answer, LS1's have no torque.


On a serious note, it's been argued that having no backpressure in the exhaust increases your top end power, at the expense of low end torque.

Could also be that you don't hear the tires spinning as much because of the extra noise from the cut-out.

I'm assuming it's an automatic, and you're stomping it from a stop.

 

ever seen a full ls1 dyno graph?

 

Actually, yes I have. I was just playing off the stereotypical LT1 guys response to any and all matters regarding the LS1.

 

I'm going with that one

 

On my LT1 I dyno'd it with the cutout open and closed - gained about 3hp, lost about 3 tq with it open vs closed. I believe due to the same opinion as above, but not sure 3 tq coud make that much difference.