Last x Days Posts  1 | 3 | 7 Days  Search  Topics  Tree View  Help

Rate this post by selecting a number. 1 is the worst and 5 is the best.

    (Worst)    1    2    3    4    5     (Best)

Author Message
Ben Lipman
Goo Roo
SA
Soarer TT manual, plus TT track car, plus a spare shell

Posts: 3784
Reg: 04-2006

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0

Monday, July 21, 2014 - 05:41 pm, by:  Ben Lipman (Ben12a)


Andrew McKellar wrote on Monday, July 21, 2014 - 12:01 pm:

Did you have the rear wheel weights arse-about in the first table? It made no sense to me that it would be lighter on the side of the car that you are sitting in.




No. They were correct. I had to adjust the springs on that diagonal to get more weight onto the LF/RR, and get some weight off the other diagonal. The side to side weight doesn't change, neither does the front to rear, but you can change the percentage of it on the diagonal. The only way to change the front/rear or side/side weights is to physically move mass around the car itself. Don't worry, I was sceptical of the theory until I did it myself.

I'll send you the excel spread sheets that shows original, after 1 adjustment, and then after the final adjustment. Apart from the car inexplicably gaining 2.5kg from the first weigh in to the third, the front/rear remains constant as does the left/right percentage.

Basically I was driving a car setup like a three legged chair. Either the left front or right rear leg (wheel) was shorter than the other legs. This explains both the right rear coming off the ground/locking up in the 1/2 braking zone (right hand kink leading into right hander for those playing in other states) and the sensation of the car falling over onto the right rear tyre coming out of the fish hook.

I just calculated your cross weights based on your data. You have a RF/LR of 708kg (50.4%)and a LF/RR of 697kg(49.6%). A difference of 13 kg, meaning your car is pretty nicely balanced, but you could wind some spring into the LF/RR diagonal and make it even if it bothered you. You can also note that your right side of the car is 81kg heavier than the left (L662/47.1% versus R743/52.9%). Like me, you may benefit from moving any mass you can to the passenger side. Alas, like me, you have probably already picked all the low hanging fruit.

  Administration Administration      Log Out Log Out