I like the curb @ T3 a lot!! lol

 

is it faster to jump the kerb there and go right out in Turn 5 then?

I've been to 2 events at road atlanta twice but I only have 5 sessions due to stuff going wrong so I realy haven't figured the track out

 

Dan, I don't have data from the S2000 there but in the ITB Protege it was worth as much as 1.8 seconds depending on how much curb you took (vs essentially staying on the track) at Turn 3. Turn 5 there wasn't a very measurable difference in the protege. But that car you could actually see it loose momentum hitting the exit curb up the hill. 110hp and 2700lbs so that data could be different then what you would find in a faster car.
Rene we ran our car at 4 inches at the jack points. (but that's min ride height from the class rules). But I'm getting some of the lowering from 24.2 inch diameter tires. I was using ALL of the suspension travel at sebring.

 

I drove his car on the 571/571 Saner front bar setup and I'm pretty sure it was at 3.5" ride height which really surprised me. I've never driven/run an S2K that low that worked well. It worked REALLY well and was one of the best handling/balanced S2K's I've ever driven with slight modifications. It might have been the saner bar reducing front roll/travel.

Since then mark increased his spring rates to 628 and i'm not sure if he raised his car or if he left it alone and the higher spring rate resulted in a higher ride height.

Nah.... Your experiences/feedback is also very good and helpful

I don't think 4" would be too low for either curb. At most I would keep your left tires still on the track while the rest of the car is in the air/over the curb in Turn 3. I probably wouldn't have your left tires be on the curb. Depending on your skill set, it might be better (and faster) to keep your left tires on the track on the exit of Turn 5 as well if you're not comfortable going 4-wheels over the curb which can be very upsetting and not definitively faster.

Are you going to run 1/2" of rake? What suspension do you currently have/what spring rate?

 

yes 1/2 rake - is that a bad idea? I thought that was about the same as stock actually

I had KG/mm lowerring springs for ages so the ride height/rake was fixed at @ 3.5" / 4"
and it felt good so I copied that. Now I have Koni sports and 600/500lbs springs.

 

with corner balancing my ride height is different on all corners, I am anywhere between 4.25" back, 3.75" front, right front is the lowest. that's on my ra1 with no tread left.

 

1/8-1/2" of rake is common, but you don't really want more than 1/2" difference in spring perch height Right-Left and preferably less than 1/4" difference. If its more than that it could have been corner-balanced better.


0.02

 

awesome, thanks for the info. I never seem to get an accurate measurement since I always forget to measure before jacking the car up to change pads etc. So when I corner balance again, having less that 1/4" difference between Left Right and Front Rear should be ideal?

 

cornered balanced the car yesterday,

LF 733 RF 686

LR 714 RR 668

Total 2801 49.9% cross 1/4 tank of fuel with me in it.

 

Is having your car too high would affect much on the handling?

I can't lower my car too much due to the design of J's Front Bumper.

I am on 10.7 cm (4.21 inch) and 11.2 cm (4.4 inch) so it has 0.5 cm rake (0.2 inch). The measurement from ground to the fender would be 64.5 cm (Front) and 65.5 cm (Rear).

I want to give your suggestion a go Billy but not sure if I can go down to 9.5 cm and 10.5 cm ride height.