Hi Volker,

I am trying to build a Cup setup for IRP (PWF version), and the information I have been working off is as follows.

Thiago Moya suggested that Richmond is a good base and I started with your Richmond setup with different diff / gearing (IRP is shorter 0.69mi).

In determining what other changes to make I have compared Andy Wilkes Richmond and IRP setups to see what type of changes he has made in the hope that I can gain some clues.

It seems like he has tried to loosen the car a little compared with Richmond, and his changes are as follows:
* 50lb more springs on the rear
* 50lb more RF spring (RF now 50lb stiffer than LF)
* More rear sway bar 0.25 inch (cf 0)
* Trackbar higher by 1.00 inch
* 0.3 deg less RF negative camber (-3.00 cf -3.30)
* Couple of other minor things like tire pressure down 0.5psi on RHS

In looking at it in light of advice you have previously given, I don't really want to add more rear springs (the car is not bottoming out), nor add more RF spring (as RF then greater than LF), and I can't recall ever seeing you use the rear swaybar. Hence, I am a little confused.

My intuition tells me to use less negative RF camber than Richmond as Andy has done, maybe make a similar trackbar adjustment and adjust the weight back to try to achieve a looser car (which is what I think Andy was trying to do). However, Andy didn't adjust weight at all between the two, so I could be going off in the wrong direction.

Any suggestions as I don't seem to get weight adjustments correct on the short track chassis (much easier on chassis 2 where you just put it back as far as you can with the car drivable) and am a little unsure as to whether I am going in the right direction. I know I am asking about a track you don't run, but hoping you may still have some pointers.

Relevant track.ini info from Richmond and IRP_PWF is below.

Any help appreciated.

Thanks

Brad


Richmond Track.ini Info (14 degree banking)
track_tire_heat = 1.08
track_tire_wear = 0.51
track_asphalt_grip = 1.10
track_concrete_grip = 1.08

IRP_PWF Track.ini Info (11 degree Banking)
track_tire_heat = 1.15
track_tire_wear = 0.53
track_asphalt_grip = 1.10
track_concrete_grip = 1.14