I saw in a thread somewhere you were debating whether or not to use your supercharger for the street because it's actually easier to get traction and accelerate without it than with. That's actually not a bad assessment and can be true more often than not. But have you got suspension upgrades in the rear? If you employ a Spohn torque arm and raise the front mount for the arm 2-inches you should see fantastic gains in traction. Also, you could always get a set of Nitto 555R tires! That's what I've got mounted on the rear of my car.

 

Jon,

I have been considering one of two things. One, taking off the supercharger and or two, putting a smaller pulley on the crank to slow the supercharger down. I raced some guy in a caddy STS, Of course, i ate his lunch, however, i was spinning through 1 and 2nd gear. I don't want to break my rearend or tranny...yet My car seemed a lot faster from 0 -30 mph take offs with out the supercharger, but if i am on the freeway......BAM>>>>neck snap! I have the following mods to the rearend are, rear end diff. cover with main cap supports, Spohn LCA's and sub frame connectors, Lower control arm relocation brackets (complements of BHAAS). I am getting ready for the chip burnning now, but i may slow the sc down a bit?

 

You're running into the same problem I had with my Vette, but at an even greater level since you're likely far more powerful than my Vette and you have an automatic. Supercharged cars are hard to drive on the street... period. The power just comes on harder and harder through your rpm band. If you weren't spinning off at 3000 rpm you will at 5000 rpm. Then once you burn off you just have to lift and start over because it's extremely difficult to throttle the car on boost.

The main problem you're going to have is gear shifts with your auto. With a stick shift you can lift throttle during a shift and blow off the boost to keep from smoking your tires when you hit the next gear. With your auto you won't get a chance to blow off the boost. When you hit the next gear you get a momentary spike in boost because you were pushing enough air for 6000 rpm at 8-psi of boost and all of a sudden you dropped to 3000 rpm. This will spike your torque for an instant and cause your tires to blow off on the shift. Then you have to lift and blah blah blah... you know how it goes. This is exactly why I am using a roots blower now and not a centrifugal. My torque curve was simply bumped up across the board and is far more driveable. I basically have the feel of a naturally aspirated engine on steroids.

I have a friend who once owned a supercharged 5.0 Mustang. It was an auto and he was quite smart about his buildup. Regardless, the car was a smoke fest on the street and was slower than the hills without slicks. You need traction and a ton of it. The reason you're faster without the supercharger is because it's easier to drive. But you already knew that I wouldn't get rid of the supercharger. I would simply start working on your suspension. The cars that are coming out of the factory now have great freeway pull and your supercharger will allow you to leave them in the dust. I'm not so sure you could walk a Z06 Vette on the freeway without the supercharger. It just depends what you want to do with your car.

 

Hey... uh... why don't you buy my Tremec TKO?