Orthojoe's track build journal
03-01-2015, 11:54 AM
#541
Three Wheelin'
Are you running with esc or tc off? Since you're only getting 4 days, have you considered switching to trofeo R? It's a shame toyo and Yokohama don't make 20" track tires. They would make a killing with all the current gen 911s and vettes.
03-01-2015, 12:02 PM
#542
Nordschleife Master
Thread Starter
Stability controls are still on. I was hoping to get some really good lap times on stock tires before I switch to trofeo R, but it's very tempting to move over to them at this point since I'm only getting 4 days out of the stock tires.
03-01-2015, 12:11 PM
#543
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NT01 has become my default track tire on the other cars, and I'd love to use them on the GT3. Not too sensitive to alignment or tire pressure, last fairly long, and grip tends to remain good until they cord. Not a pleasant road tire though - quite loud (like R888).
03-01-2015, 12:19 PM
#544
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- In addition to the chunking in the middle, there's evidence of graining. Maybe you're overdriving the tires? Or the tires can't handle being pushed really hard?
- Wear at the shoulders is less that the rest of the tread, which suggests tire pressure might be a little high, but the left middle band is worn a lot, and right middle band is chunking, which suggests tire pressure isn't too high.
03-01-2015, 12:36 PM
#545
Three Wheelin'
Joe, or anyone, when changing brake pads, did you hang the caliper with anything? On the S I would rest it on a bucket while I changed the pads. I'm curious what others do to avoid pulling on the brake line.
03-01-2015, 12:59 PM
#546
Nordschleife Master
Thread Starter
I'm no tire wear expert, but the wear pattern looks a little weird to me. - In addition to the chunking in the middle, there's evidence of graining. Maybe you're overdriving the tires? Or the tires can't handle being pushed really hard? - Wear at the shoulders is less that the rest of the tread, which suggests tire pressure might be a little high, but the left middle band is worn a lot, and right middle band is chunking, which suggests tire pressure isn't too high.
I use a bungee cord to hang the calipers
03-01-2015, 01:01 PM
#547
Three Wheelin'
Like a 2" one? I'm changing them today. Maybe I'll take pictures as I go so others can see what has to be done. I need to go watch Money's CL removal video again. :-) Fun day Sunday, changing to PFC's, then heading up to Lick Observatory and up Mines road.
03-01-2015, 01:06 PM
#548
Instructor
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Joe - you said that the tires only lasted 4 days. Was this with your co-driver driving also, in a different run group? So would that really be 8 days? Maybe to put it another way, how many runs (and heat cycles) did you get, and what was the approximate total track mileage?
03-01-2015, 01:14 PM
#549
Nordschleife Master
Thread Starter
Joe - you said that the tires only lasted 4 days. Was this with your co-driver driving also, in a different run group? So would that really be 8 days? Maybe to put it another way, how many runs (and heat cycles) did you get, and what was the approximate total track mileage?
The tires were subjected to
1) 21 track sessions/heat cyles lasting from 15-40 minutes
2) A total of 562 track miles
Last edited by orthojoe; 03-01-2015 at 01:57 PM.
03-01-2015, 01:51 PM
#550
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I'm no tire wear expert, but the wear pattern looks a little weird to me.
- In addition to the chunking in the middle, there's evidence of graining. Maybe you're overdriving the tires? Or the tires can't handle being pushed really hard?
- Wear at the shoulders is less that the rest of the tread, which suggests tire pressure might be a little high, but the left middle band is worn a lot, and right middle band is chunking, which suggests tire pressure isn't too high.
- In addition to the chunking in the middle, there's evidence of graining. Maybe you're overdriving the tires? Or the tires can't handle being pushed really hard?
- Wear at the shoulders is less that the rest of the tread, which suggests tire pressure might be a little high, but the left middle band is worn a lot, and right middle band is chunking, which suggests tire pressure isn't too high.
The rears though look strange. Mine were wearing like that with -1.4 degrees. I've never seen a tire wear like that with so much negative camber.
03-01-2015, 02:55 PM
#552
Three Wheelin'
Just a different approach...I double up coat hangers together with a shop towel to not scrape calipers, takes all tension off brake line if you bend them right.
03-01-2015, 03:27 PM
#553
Three Wheelin'
I got a wide variety of bungies and a low profile jack, and will be attempting this now. Thanks again to Joe et al for the notes
03-01-2015, 03:29 PM
#554
Nordschleife Master
Thread Starter
03-01-2015, 03:46 PM
#555
more like 12". You hook the caliper with the cord, not the actual hook, so it's looped in a U shape.
Yes and no. We ran in different run groups, but for various reasons they were not full track days. To make things a bit more clear I can tell you this:
The tires were subjected to
1) 21 track sessions/heat cyles lasting from 15-40 minutes
2) A total of 562 track miles
Yes and no. We ran in different run groups, but for various reasons they were not full track days. To make things a bit more clear I can tell you this:
The tires were subjected to
1) 21 track sessions/heat cyles lasting from 15-40 minutes
2) A total of 562 track miles
Oh and check your PM's
