OK, Here is my latest effort at Putnam Park. Of course, I need my plethora of excuses.

The setup on the car was wacked. I asked my shop to give me -3.0 camber up front and -2.5 camber rear. The car is limited to -1.3 or -1.4 up front and -3 in the rear so they gave me -1.3 up front and -2.5 rear. This had some undesirable effects. First, with MPSC’s (265 front 315 rear) this now induced pretty serious push in the turns. Worse than that, I could not put the power down on the car and burned the right inside tire in just over 2 days of tracking. So, turn in OK, push in the middle, oversteer on exit. Not a good setup.

Because I did not have time to get my car to the shop to have the camber fixed (and to have the rear fenders rolled even more – they cut the other new MPSC), I decided to head to Putnam with worn PS2’s (outsides worn due to lack of camber), and the 3 days used MPSC’s as an option upfront.

The first session I started with PS2’s all around. The tires were worn on the outside but the excessive negative camber in the back should eat up the insides so I thought no problem. The issue was then the understeer was pretty bad. After 1 session, I changed from 235 PS2’s up front to 265 MPSC’s. This had the expected … and hoped for effect of balancing the car in the turns. It still had throttle induced oversteer on exits so I had to be careful with the throttle.

Now what happened as the sessions went on was interesting. For the first half of the session the car was pretty neutral, maybe a tad loose. As the session progressed when I was driving hard, the rears would go off and the car would get real loose. Ask some of the people who were following me as I wagged my tail around the track trying to control her. Fun … but very demanding. On the slow turn (7) it was great because I could dive-bomb the apex, rotate the car around and squeeze the throttle for real quick turns, but at the high speed turns things got a little dicey. The MPSC’s handle the heat much better than the PS2’s.

Also, take a special note of the little “bob” the car does on the entry to 5. This is a blind entry somewhat high speed sweeper to the right and you can enter it trail braking. When I do this, you will see the nose drop for the trail braking then lurch about 5 feet to the left as the PSM kicked in to stop the very rotation I wanted. It did this before, even stronger, and sent me off twice on that turn. (Yes, I should have learned the first time the car did it.) I plan to have the PSM and ABS (they work or disable together) disabled for my next event.



https://netfiles.uiuc.edu/tmccrthy/P...mv?uniq=9sh0q1


As usual, right click and save as. It's about 80 meg. It is a high definition (1280x720) wmv file and requires no special codec but plays best with a fairly fast PC. Don’t try to stream it. If the server says quota exceeded, try the download again a little later. Hope you enjoy.

I plan to have the car set-up for -2.25 front, -1.75 rear for the Wheel Source event back at Putnam Park at the end of the month and hopefully I can improve on my time and "smooth" things out.

 

link no work for me.

says 404 error

 

Sorry, fixed.

 

Tim wish you were coming to Grattan the 23-25 would have been fun to have you there.

 

Tim - you're getting pretty serious about tracking. Good for you! I wish I had the time to do the same. You're driving skills look awsome. Thanks for posting the track footage.

Mike

 

I love the 2 camera system! Looks like a lot of fun. Thanks.

 

Thanks guys, I am trying to get better. How do you like the video quality? I am getting better at encoding and compressing, but this isn't too bad huh?