|
Tracking / Autocross / HPDE / Drifting What these cars were built for! |
|
Thread Tools | Search this Thread |
08-08-2020, 09:10 PM | #1 |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Hoosier A7 lap times vs first 3 heat cycles?
I ran A7s for one session at Palmer today, set decent time. Tomorrow there will be 2 practice sessions followed by time trials. Wonder what to expect in terms of potential lap time degradation. Would like to at least run a partial practice session on the a7s before TT, but wonder if the additional heat cycle might cost me a few tenths to half a second...
|
08-08-2020, 09:15 PM | #2 |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Other tires are Conti ECS, 4.5-5 seconds slower and different diameter, so not best practice tires for TTing on the A7s!
|
08-08-2020, 09:17 PM | #3 |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Basically I'm wondering if I might lose more time by putting another heat cycle on them than I'd gain from having the additional practice on them...
|
08-08-2020, 10:08 PM | #4 |
Senior Member
Join Date: Nov 2018
Drives: 2013 FRS
Location: Seattle, WA
Posts: 106
Thanks: 0
Thanked 51 Times in 29 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Degradation from heat cycles is minimal for A7s. My advice is to ignore heat cycles and drive them until they cord. If you'd like to do your own analysis you can search for my transponder number in Race Hero, 1562231. I've used the same set of A7s in 2020 for every session except one where I went out on the Federal FZ201s I use to transport my car. After 12 heat cycles I can still set the fastest race time in T4 and the other people racing T4 around here are not slouches.
__________________
2013 FRS - SCCA T4/ICSCC CT4 | Instagram: Totemo_Hayai
|
The Following 2 Users Say Thank You to Totemo_Hayai For This Useful Post: | strat61caster (08-09-2020), ZDan (08-09-2020) |
08-09-2020, 01:06 PM | #5 |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Ran 2nd session this AM, which others say was slow due to heat. Did 1:48.6 vs 1:48.7 yesterday. Top competition did 1:48.5 1st session but was a second slower 2nd session, he's in a nodded E36 M3 on A052s.
Also in class another BRZ on Pirelli slicks, 981 Cayman S on RE71Rs, they're low 1:50s (though I did a 48.2 in the Cayman yesterday!) Interesting group! |
The Following User Says Thank You to ZDan For This Useful Post: | rice_classic (08-09-2020) |
08-10-2020, 12:04 PM | #6 |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Won TT with a 1:48.1 vs. M3 at 1:48.5
|
The Following 4 Users Say Thank You to ZDan For This Useful Post: | CSG Mike (08-10-2020), Jdmjunkie (08-10-2020), Racecomp Engineering (08-10-2020), strat61caster (08-10-2020) |
08-10-2020, 06:43 PM | #8 | |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Quote:
It was a great fun event with stiff competition from the M3. My bud's gambit with used Pirelli slicks on his BRZ emphatically did not pay off. He has gone faster on A052s! Pirellis musta been fossilized, durometer was 60 vs. 45 for the A7s... |
|
The Following User Says Thank You to ZDan For This Useful Post: | CSG Mike (08-10-2020) |
08-10-2020, 07:05 PM | #9 |
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Oh yeah, funny story about the 981 Cayman S driven by friend and co-worker. I kinda talked him into that car after driving a student's at the Glen last year. Anyway he was not finding the fast way around on Saturday and asked me to take it out while taking data and video (couldn't take him out with me due to club Covid restriction). After running a 1:48.2 I got into ice mode (apparently) going into T4. Foot hard on the brakes but it only gave me like 75% max braking and pedal was hard as a rock :O Went off and found the tire barrier with the front left corner, tires went flyin everywhere! I thought the front would be destroyed, but lo they use circle-track slicks for tire barrier for the motorcycles, they weigh like 8-10 lb. and are flimsy as hell! We 90% "fixed" it with that spray that cleans track rubber off, and looks like it'll be 98% fixed by peeling off and replacing the clear protective film he had put on the car. Whew!
Last edited by ZDan; 08-10-2020 at 07:25 PM. |
08-10-2020, 07:20 PM | #10 | |
Join Date: Jul 2012
Drives: S2000 CR
Location: Orange County
Posts: 14,522
Thanks: 8,911
Thanked 14,166 Times in 6,828 Posts
Mentioned: 966 Post(s)
Tagged: 14 Thread(s)
|
Quote:
I'd love to see a video with a data overlay showing brake driver input vs system pressure vs wheel speeds. Glad both you and the car escaped relatively unscathed. |
|
The Following User Says Thank You to CSG Mike For This Useful Post: | ZDan (08-10-2020) |
08-10-2020, 08:41 PM | #11 |
Senior Member
Join Date: Apr 2015
Drives: GR86 2022
Location: Boston MA
Posts: 295
Thanks: 10
Thanked 197 Times in 72 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
I will add a data point for ice mode. Mine was a Cayman S 978. Happened at turn 1 going CCW. Solved the issue with stiffer spring rates all around.
S and I was talking about the take offs last week, too bad the turn out was not as good. I was driving the new v730 at the glen over the weekend and was pretty confident it can go as fast as the fz201s but driver side wheel bearing when and had to end the event early. And speaking of wheel bearings...its the 3rd one I had to change out. Thinking about just changing them all out on a yearly basis as a safety maintenance. |
08-11-2020, 08:22 AM | #12 | |
Senior Member
Join Date: Apr 2019
Drives: 86, 981S, RX8, 2500HD, GenesisV8
Location: Palmer Motorsports
Posts: 119
Thanks: 82
Thanked 70 Times in 43 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Nice work Dan! |
|
The Following User Says Thank You to TunaNoCrust For This Useful Post: | ZDan (08-11-2020) |
08-11-2020, 08:44 AM | #13 |
Senior Member
Join Date: Apr 2015
Drives: GR86 2022
Location: Boston MA
Posts: 295
Thanks: 10
Thanked 197 Times in 72 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
|
The Following User Says Thank You to dreamwonder For This Useful Post: | TunaNoCrust (08-11-2020) |
08-11-2020, 12:53 PM | #14 | |||
Senior Member
Join Date: May 2011
Drives: '23 BRZ
Location: Providence, RI
Posts: 4,577
Thanks: 1,373
Thanked 3,883 Times in 2,027 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Weird, I ran a 2011 non-S Cayman last year, on PASM springs (~30% stiffer vs. non-PASM), I never had this problem with braking. The 981 Cayman S I drove at Watkins Glen and at NHMS was on Ohlins coilovers, and it would "hunt around" under hard braking and actually it gave me the "ICE mode" thing going into 3 at NHMS, I had to take the exscape road. For some reason I forgot about that when I was driving 981 at Palmer the other day! Quote:
It was worth it tho Quote:
Last edited by ZDan; 08-11-2020 at 01:12 PM. |
|||
|
|
Thread Tools | Search this Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
FS:[WA] Hoosier R7 tire set 245/40/17 (like new) | glamcem | Wheels and Tires | 5 | 04-30-2020 12:09 AM |
New Hoosier R7 245/40/17 | airindia33 | Wheels and Tires | 1 | 01-14-2019 11:46 AM |
Like new FR-S wheels with Hoosier R-7s 600.00 | Mgrand34 | Wheels and Tires | 5 | 12-25-2015 08:50 AM |
Hoosier R7 ????? | Deep Six | Tracking / Autocross / HPDE / Drifting | 6 | 01-04-2015 09:21 PM |
Hoosier R-6s | Lunatic | Wheels and Tires | 2 | 11-02-2014 12:28 AM |