As some of you know I upgraded my car over the winter. Here are some of the mods
- 3.73's From 3.55's
- Eaton TruTrack From Ford LSD
To start with, the 3.73's and Eaton were spot on when I was at Watkins Glen. Top speed at the Glen approach 140 but only approached it for a short period of time before getting on the brakes. My last track day at Pocono was very different. The set up was perfect when I was going thru the infield. The problem I had was on the super speedway. We were using 2.0 miles of the 2.5 mile tri-oval. I don't believe there were any "stock" cars in my run group. Even a Z4 who I thought I would eat got by me on the straights. I later learned why, like a lot of guys on track had a blower.
So here is how it was on the straights for me. I would get into 4th and my car would pull very strong to 130. 140 would come at about 6,200 RPM. I have my shift light set at 6,100. I just did not feel comfortable keeping my car near the 6,500 redline for so long, so I stayed clear of the rev limiter. On a side note a Z06 (dedicated track car) with a supercharge went by me at the end of the day. He grenaded his engine. I know I am NA but that is exactly what I was worried about.
I know a certain Trak Pak owner that has 3.90's. With 3.90's what would be the top speed? That lead me to think about 5th again. I spoke to the guy that rents out '08 Mustang GTs at the track events I go to. He is one of the head instructors of NASA. He gets the rental Stangs up to 142 with few mods and running 3.55's. I asked him how. His answer was very interesting. He short shifts his car and gets into 5th and lets the car pull in 5th. I did not try it. I did however try dropping my car into 5th at 130. I blipped the throttle, but even with that it felt like some one pulled the ebrake. I am never doing that again. As a side note the rental Stangs did poorly IMO thru thru the twisties.
So hindsite being 20/20 would I go from 3.55's to 3.73's again. Absolutely! The car feels so much better in the turns and under acceleration I am, however, very glad I did not go with 4.10's.
I think I will stay off super-speedways with my car in advanced run groups. The cars in the advanced groups have to much top end for me. To try to make a good showing I would stay on the accelerated and brake very late going into the hair pin. This suprised when M3 that tried to brake as late as me. Good thing there was plenty of run off. I still have not used my 6 pistons to their full potential. Speaking of the StopTechs, I noticed that some of the Z06 guys take off their 6 piston Vette brakes and run the 6 piston StopTechs. I asked one good why. His answer was the StopTechs are just better. I think the pad size is actually the same.
I will be at NJMP on the lighting track on August 3rd. This thread is a moot point. My car is set up perfectly for NJ.
So the bottom line on this thread, what experience do you guys have with different rears running on tracks.