[Judd]

I know this is a autoX/road course site but I though some of you might have some insight on this question so I decided to throw this out. I'm thinking about running my car at Maxton N.C. at the E.C.T.A. 1 mile event. I'm putting down around 540RWHP and right now I'm running a 4.10 gear which should max out somewhere around 165 or so. I should get to that which is cool by me since my tech speed should be 175mph. To go over that, I will need a real cage which I'm not willing to do right now.

Later, I would like to replace the gear so I can get some more mph but I'm a bit confused. I've heard that you really should do your best to run 4th gear {1:1} for top speed events because that is the most efficient but my my set-up would really be doggy with something like a 2.73 in the rear. I'm really thinking of running a good dose of nitrous in an effort to get to 200mph {one of my goals} and I think I should have the power to do it but just how much will running 5th gear hurt me? Sure would like to run a 3.42 or 3.73 so I wouldn't have to swap out axles all the time.

Also, I will be carrying a trailer with extra wheels, tools and possibly a bike so I really would like to keep a low gear.

[v7guy]

Are there any driveshafts other than the carbon units you guys would recommend. I know the LT1 shaft isn't good for those speeds but isn't there a cheaper option while still being safe?

[AndyJ]

Are there any driveshafts other than the carbon units you guys would recommend. I know the LT1 shaft isn't good for those speeds but isn't there a cheaper option while still being safe?

Jason,

I ran the aluminum drive shaft for many miles at speeds > 150mph with no problems. I changed to a CF driveshaft because of just a *barely* perceptible vibration at 145 and greater.

[Blainefab]

Are there any driveshafts other than the carbon units you guys would recommend. I know the LT1 shaft isn't good for those speeds but isn't there a cheaper option while still being safe?

Jason,

I ran the aluminum drive shaft for many miles at speeds > 150mph with no problems. I changed to a CF driveshaft because of just a *barely* perceptible vibration at 145 and greater.

My 1LE aluminum shaft started howling around 150, and was a deafening shriek by 170. Changed to the ACPT CF shaft and it was smooth past 190.

There are others that sell CF shafts, some don't have the protective layer of fiberglass that ACPT uses.