MyE28.com

Took the Buzz Bomb to the track on Saturday. I had planned on running more boost but decided against it so the car ran with 16psi. Previous best was 12.99 @ 109.73 with a 3.46LSD.

Car was abt 50lbs lighter. Ambient temps were 10F colder than the last run but we ran into a 15mph headwind all day.

I also installed a 2.93LSD so that I could finish the 1/4 in 3rd gear. I also had M/T 24.5x8x15 slicks.

I was sure the car would hook and I would go at least 12.50s. Well the car hooked all right but I didn't have enough power to keep it from bogging and not enough clutch to slip it out of the hole.

This was a big lesson. With this much grip the car needs a 3.73 or 4.10. I ran 11 times in 2hr 15mins. Motor ran flawlessly. The drivetrain withstood 8 huge clutch drops including abt 5 at 6000rpm. On the last run a strap on the pressure plate broke.

I did gather some interesting data. Check out these times in back to back to back runs.

3:34PM 12.8048 @ 109.26
3:41PM 12.7627 @ 109.26
3:48PM 12.7568 @ 109.53

So much for heat soak!

Todd

Hmmm....that is interesting. I'm assuming that the S2.93 arrived at the shop in acceptable condition? Sorry it didn't turn out as planned

At least now you know how the car reacts to such high gearing.

How about 3.73 gears + traction control with launch and full throttle shift options?

BTW - drove up behind a black E60 M5 coming out of my neigborhood today. He was on his cell phone driving very slow, I was in the Audi. I have found the first E60 M5 to get the full M535ti treatment. More to follow. 8)

T_C_D wrote:the car hooked all right but I didn't have enough power to keep it from bogging and not enough clutch to slip it out of the hole.

Todd

I'm thinking the flywheel is too light to launch the car with those tires…