Car #: 33
Year : 1994 Posts: 422
Any thoughts, hopefully based upon tests or at least sound logic, on how close the left and right wheelbases must be.....so that handling is not impaired Right vs. Left? The spec book says 2277mm nominal I believe.
Just for reference......the roundy boys purposely shorten their left side wheelbase by around an inch to make the car turn left better. Note: JD's Setup Guide V2 apparently is mute on this point so I'm guessing he feels it is irrelevant so long as everything else is setup properly.
-------------------- "In our sport if you go out of bounds you're most likely not coming back" Michael Waltrip
Region: WDCR - 042
Car #: 75
Year : 93 & 95 & 99 Posts: 3727
At a neutral position they should be the same or your car is bent.
-------------------- Mike Collins MEATHEAD Racing http://www.SHEETZ.com The MEATHEAD Racing 2010 Calendar is up!!!! www.MEATHEADRacing.com SMAC Member WDCR-SCCA SM Drivers Rep. ALL OPINIONS ON RULES OR SPECIFICATIONS ARE JUST THAT, MY OPINIONS!
Region: NWR / Oregon
Car #: 88
Year : 95 Posts: 2000
I think JD just assumes they're equal.
For roundy round, it works to have them different. All other things being equal, shorter WB = tighter turning radius. The inside wheels track a tighter line than the outside so having the side with a tighter turning radius take a tighter arc is good. Turn the other direction and the tighter turning radius has to take the longer arc which can't be good and vise versa.
I'd guess a roundy round setup turning right = lots of slidey slide.
-------------------- Keith Novak (Will work for tires)
Year : 90 Posts: 180
Depends upon how well you're measuring caster. If caster is dead nuts equal side to side, wheelbase should be too I think. If estimating caster loosely (I do, no plates) no more than 1/16" to 1/8" or so.
Did you replace your Subframe after the shunt into the IRP wall mentioned in the other post? If not, I would. You may have to "slot" your new subframe for it fit onto the rails.
Car #: 12
Year : 1990 Posts: 830
If you have to slot your subframe, your car is probably bent, get it pulled back to shape or it won't handle consistently right to left. Honestly, if I saw someone with a slotted subframe I'd be kinda p***d off, because (in the NE) there are a few tracks that you only care about turning one direction, and that would be an nice (but illegal) advantage.