did I overheat tires?, rubber migration on A7 |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
did I overheat tires?, rubber migration on A7 |
mskala |
Oct 13 2016, 06:42 PM
Post
#1
|
R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
This is what both my rears looked like after last weekend auto-x. It wasn't
even hot outside. Is this an indicator of anything particular I'm doing wrong? About the only abnormal thing on the course was a long 180 that was not quite a hairpin but I had the gas pedal to the floor for the whole last half of it. Basically with a 2.3 and limited slip and my setup, no possible way to spin with foot on the floor. |
mskala |
Oct 26 2016, 12:39 PM
Post
#2
|
R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Yeah, I actually found that the 'adhesive remover' blade for the vibrating saw tool
thing gets the excess rubber off pretty easily. So, my tires aren't blue or ridiculously worn after 5 events (8-9 runs avg). However, at the last event we did 6 in the morning and 6 again in the afternoon. By the 5th and 6th runs the car felt really sloppy and even though I was driving a better line it was slower. Not 'overheating' but out of the good grip temp range of the 'A' compound. So, IMO the A7 is inferior to the A6 where I never noticed this. Either I should go to the R7 or find something else maybe. Anybody looking for a good deal on used 205-45-16? |
ChrisFoley |
Oct 27 2016, 01:20 PM
Post
#3
|
I am Tangerine Racing Group: Members Posts: 7,926 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
|
6freak |
Oct 27 2016, 03:20 PM
Post
#4
|
MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
By the 5th and 6th runs the car felt really sloppy and even though I was driving a better line it was slower. Not 'overheating' but out of the good grip temp range of the 'A' compound. Tire pressure. yep building heat/pressure fast with AX tires and not checking pressures after every run will make basketballs outta them! even on a cool day.... |
mskala |
Oct 27 2016, 04:20 PM
Post
#5
|
R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
I check pressure after every run and reduce back to my 'target'.
By the 5th and 6th runs the car felt really sloppy and even though I was driving a better line it was slower. Not 'overheating' but out of the good grip temp range of the 'A' compound. Tire pressure. yep building heat/pressure fast with AX tires and not checking pressures after every run will make basketballs outta them! even on a cool day.... |
6freak |
Oct 27 2016, 09:06 PM
Post
#6
|
MR.C Group: Members Posts: 4,740 Joined: 19-March 08 From: Tacoma WA Member No.: 8,829 Region Association: Pacific Northwest |
I check pressure after every run and reduce back to my 'target'. By the 5th and 6th runs the car felt really sloppy and even though I was driving a better line it was slower. Not 'overheating' but out of the good grip temp range of the 'A' compound. Tire pressure. yep building heat/pressure fast with AX tires and not checking pressures after every run will make basketballs outta them! even on a cool day.... OK check and check what are they set at and whats normal ambient temp and how long are your course`s its all i can think might do what your describing those are very very good DOT AX tires and they all (Slicks)gather marbles when there hot with the Kumho 205 -50-15 tire i run 22-24 in front 24 26 in back, colder days (PNW) its more to the lower PSI.but i like my car a little on the loose side and i can feel the car going away with lower PSIs ..our course`s are very tight in the 56 second time range and i like to slide the back end around the tight turns 0 over heat just normal build up...another 914 guy here runs same tires as you (slight flared fenders) and ive heard him say up to 32 PSI WOW! I would run those probable not at that PSI but they dont fit under my car not even the 205 50 15`s too wide .....so IMO its not the tires, its YOU (IMG:style_emoticons/default/biggrin.gif) getting faster and overcome grip factor in the way your driving! dont upset the car so much..Smooth but a little bit loose in the corners is good if you can keep the ass end hanging out there a foot or so and drive through it with the pedal to the metal Smooth = fast even if your cars not going strait and you have to counter a bit...yes strait with no slide is fastest but when you can help but slide because of your speed you then must become smooth to go faster....ask me how i know (IMG:style_emoticons/default/first.gif) I love those things Play with the PSI`s.. have fun and drive the wheels off that bitch (IMG:style_emoticons/default/driving.gif) |
Lo-Fi Version | Time is now: 18th May 2024 - 07:40 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |