SCCAForums.com

Does anyone have numbers for g's pulled at Heartland park?  I think that sustained g's for a variety of cars and with comparisons to other surfaces would be interesting.  Watching cars and talking to some people it sounds like the street tires were doing OK, but based on my experience and talking to other people, slicks had problems.  Probably it was better this year, but still not very good.  Did anyone else notice how fast CSP was?  They looked great too.  It just didn't seem like people could charge the course like that on slicks.

Do the numbers agree?

Peter Raymond

My STS car was pulling steady state in the 1.15 range, uncorrected for roll, but my car doesn't roll much to begin with. I watched the HART EP Civic go up on two on the west course, DSP BMW's up on two, an HS Civic up on two... I think the grip is there, IF the surface is warm and you aren't out in the sand.

---

Nate Whipple
NER
188/88 DSP ITR

The PAX results show the highest placing "Car" with slicks was Jeff Kiesel's EM Sprite (80th) . Several F125 and FM cars were higher.

IMO: the 2007 EM Pax was a little soft and that would leave NO "Cars" with slicks in the top 100. A person "could" think that indicated slicks might not be the answer.

DM, and maybe others did get scewed by the wet cold surface 1st heat Tuesday, just as EM did in 2006.

Del Long

almost no "cars" on slicks..   Tunnell was 23rd, I was 52nd and Steve Hoelscher was 62nd.    We all ran second heat Thursday Friday.

---

Keith
'90 Miata with a really big roll bar
www.chaserace.com
www.tightntidyracing.com
www.vorschlag.com

I also had a very bad 1st day double coning my first run (was .9 faster than what I stood on) and coned my second run (.3 faster)...  If I had my first run clean would have put me about 30th overall instead of 80th overall.  There was plenty of grip, my car just had a bad push with the unmatched tires (A compound in front and B compound in rear)....  I think I would have been much faster with B compound all around and a little faster with A compound all around..  Not sure on G's I have not downloaded my data from the logger yet.

FYI I think the PAX for EM is just right for that surface (the higher the grip from HPT the softer the PAX becomes)

 Jeff Kiesel

My EP Civic on Avon Slicks was getting 1.3 to 1.4g steady state, corrected for roll.  This is pretty typical for the worst surfaces I can find to run on during the year.  On a hot day on a nice asphalt, I've seen up to 1.7 in the car, with 1.5 to 1.6 being pretty common.  I think the peak grip is reasonable, it's the drastic change from on line to off line that is so hard to deal with.  I have a good example logged from my 2nd run ont he West course.  I tried really attacking the tight offset (keyhole) that was right before the fast right that led to the S turn at the finish.  As I transitioned back to the left after going through the opening, I ran out of clean surface and hit some of the sand.  On line, I was over 1.5g in this transition.  As soon as it got off line, the grip dropped to 0.5g.  That's a pretty dramatic dropoff - WAY more of a change than I see anywhere else I can run at.  It's that huge variation in grip that makes this surface so different.  Hopefully they will put forth some effort in 08 to address the sand issue.

-Chris