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Old September 15th, 2010, 07:23 PM   #1
ChrisZang
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A track day riddle ...

... I am interested in any good advise etc ...

So last Sunday was - most likely - my last track day of the year with CDS in Laguna Seca.
My best lap so far (from last year) in Laguna is a 1:49 flat and I was very much hoping that I would be doing one or two seconds better this year with upgraded suspension and stickier tires.

So Sunday morning is very cool and foggy and the first session is in damp conditions (breaking after the crest in the corkscrew was "a challenge" )

But my best lap in these conditions was a 1:50 - not bad
Now all the following sessions were in ideal conditions:
Sunny, dry, warm asphalt, tire pressure is correct and the best I could do was a 1:52

So now I will be agonizing the whole winter over this unless someone has a good explanation....

Chris a.k.a. "Captain Slow"
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Old September 15th, 2010, 09:38 PM   #2
Docdanracy
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Chris,
what tires and how many heat cycles on them...
What tires and how many heat cycles on them when you did the 1:49
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Old September 16th, 2010, 03:47 AM   #3
ChrisZang
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Greetings from Boston

Hmmmmmm,

good question. I had bought used Sport Cups from a guy who said he had two track days on them. Let's make that 8 heat cycles.
Before I went to Laguna I put 13 more heat cycles on them
So that means I arrived in Laguna with around 21 heat cycles on them. (side note: but there is still so much thread left on them )
That means my damp run was heat cycle #22 and I guess, Dan you think that this was it. This would make sense as the car was a bit of a handful in turns 3 and 5...

How many heat cycles should I get out of a Sport Cup?

The 1:49 was done on relatively new Dunlop Direzza Start Spec Z1 (the ones where I had trashed the right front in T'Hill - if you remember my little understeer problem when I got the tire pressure completely wrong last year)

Cheers
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Last edited by ChrisZang; September 16th, 2010 at 04:18 AM. Reason: forgot something
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Old September 16th, 2010, 07:49 AM   #4
Docdanracy
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Chris,
this is just my personal opinion, but I have never liked the Michelins...don't like the feel. They always seem to take a set and then mid corner take a second set...maybe it is just my driving style...anyway.
I have a new set of the Dunny Direzzas on my 914 and they really stick for a street tire....I really like them.
I think your Michelins may be on the downhill slope in the stick department.
Also since you bought the Michelins used, you never really know how many heat cycles they had on them or how old they really are or how they had been stored before you got them...

With your new suspension stuff, I would expect with a new set of DOT Rs you should be at a ~1:47.
Years ago when we had just built BillPs spec Box and took it to Laguna for it's maiden voyage we had all the suspension set at the mid settings and we were doing 1:46s right out of the box with two on board and lots left to adjust.
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Old September 16th, 2010, 03:55 PM   #5
ChrisZang
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Thanks Dan,

I had used two sets of DOT-R this season:
used BFG-R (from Grant) and the mentioned Sport Cups.
The BFG are on 17" rims and the Sport Cups on 18"
Don't know why (maybe it's my driving style or the rim size) but I preferred (and was also faster on) the Sport Cups.

But if all the difference between the Star Specs and the DOT-R is ~2 secs, then *maybe* the right thing for next season is to save some money (and the trouble of driving DOT-R to the track) and run on my street tires again...
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Old March 10th, 2015, 06:13 AM   #6
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Racing of cars costing no more than $500....your chance to see
these beauties up close and 'on track' ???
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