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Originally Posted by jlfx car audio
(Post 15063585)
I know this complicates this thread a little more but I tend to set our cars up with more rear weight bias by a few %. Car just feels to rotate better
*all measured cars by me. I calculate wheel rate and all current and old cars by extension derive from the same design (rear shocks closer to wheel). I have some cars that spring balance was achieved by reversing the recommended spring setup front to rear. |
So I started round 1 with the same settings as the previous Friday nights racing. The rear was a little loose on power again so this time I increased the front droop without making any other changes. I went from 8.8mm to 7mm on the front downstop setting. For round 2 the car felt better on power but I noticed the rear was still struggling for grip going through the chicane after the main straight.
After more careful attention and really focusing on when it felt loose I felt the rear was braking loose mid corner rather than corner exit and it felt like lazy over-steer. I shortened the wheelbase for round 3 and the car felt much better but still had a tendency to loose the rear through the chicane. For the Final I added a little more rear droop to avoid lifting a rear wheel during the fast direction changes and it seemed to do the trick. I went from 8.5mm to 8.0mm and the car felt the best it had all night. During the final I also increased the -VE steering expo and that further helped, so much so I could turn up the dual rate a little to gain some slow corner steering lock. I think overall droop behaves the way theory explains but when a wheel lifts due to the downstops it reduces grip at that end so can sometimes reduce grip at the end you decreased the droop, the opposite of the theory. Like a lot of people have mentioned, by changing one setting you impact many more and it is finding that balance that works. At least now I think I can see how droop affects the handling and droop is better used to fine tune over-steer/under-steer, relying more on spring rate and roll bars in the first instance. |
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