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Car tuning question

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Old May 23, 2013 | 04:41 AM
  #41  
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Yea, you're on the low side now in degrees.

AP2 In Degrees: Total Toe In is 0.33º or the range of or 0.14º - 0.51º degrees

For each rear tire toe-in is 0.16º or the range of 0.07º - 0.26º degrees
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Old May 23, 2013 | 05:26 AM
  #42  
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Drive is at 0.10º, see if it feels better, and go from there. Maybe take some rebound out of the rear shocks to keep the rear tire on the ground.
I'm guessing that when you jack up the car, there is plenty of travel on the rear wheel? If so, I'm betting Nick is right, that there is too much rear rebound in the car and it's keeping the tire in the air. I deff learned something there, never would have though to remove rear rebound.

I'd say you are in the right range for rear toe, I'm running 0.10º, but my car is significantly softer sprung than yours, possibly allowing more toe-in on throttle.
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Old Jun 3, 2013 | 09:17 AM
  #43  
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Just a small update, I didn't do any video from the weekend so I can't post that. I brought out the chicka so didn't really focus on video/data or any of that. I ended up going softer on the rear bar from 3/5 to 1/5 and took out 1 click of low speed compression all the way around and 5 clicks (like half!) of the high speed compression. The car felt much less nervous and a lot more planted and rear felt more stable!

Couple pictures of the body roll of the car and cornering balance. Nick/Rob, looks like I'm looking around the windshield again haha



I'm racing again this coming weekend and will get video. I spent all Saturday at a autox school with Marc P working on smooth inputs and smooth throttle. I swear the throttle pedals feel different from my AP1 to the CR.
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Old Jun 3, 2013 | 09:28 AM
  #44  
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probably the DBW?
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Old Jun 3, 2013 | 09:38 AM
  #45  
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Originally Posted by s2000ellier
probably the DBW?
Obviously the DBW Haha!
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Old Jun 3, 2013 | 10:44 AM
  #46  
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Originally Posted by josh7owens
Just a small update, I didn't do any video from the weekend so I can't post that. I brought out the chicka so didn't really focus on video/data or any of that. I ended up going softer on the rear bar from 3/5 to 1/5 and took out 1 click of low speed compression all the way around and 5 clicks (like half!) of the high speed compression. The car felt much less nervous and a lot more planted and rear felt more stable!

Couple pictures of the body roll of the car and cornering balance. Nick/Rob, looks like I'm looking around the windshield again haha
Good stuff there Josh, all intelligent setup changes given your video and body roll photos, glad it's working well for you now!
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Old Jun 4, 2013 | 03:56 AM
  #47  
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I guess you can learn something new every day. Let me make sure I'm understanding this right because I was thinking it worked the opposite way....

...Backing off the rebound makes the wheel return to it's original position because you're letting the shock do less and it's more of the spring doing work? When you increase the rebound you're making it slower for the spring to react by the shock doing more of the work?

And then compression works in a similar fashion?
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Old Jun 8, 2013 | 02:49 AM
  #48  
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Originally Posted by captain_pants
Someone here referred me to the Smithees/Neil Roberts article some time ago: http://www.ozebiz.com.au/racetech/th...hocktune1.html
While there was some good info there, I found it impossibly disorganized for planning a quick adjustment. I rewrote all the points in what I thought was a more logical order and made a quick reference chart:

Has anyone used this chart and found any errors? I'm looking for feedback. This has helped me immensely so far. My car was an understeering bastard for the first two days at Lincoln, this helped tweak the car to that surface relatively quickly.
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