Delaminated Dunlops (Sport Maxx Race 2)
#31
Addict
Rennlist Member
Rennlist Member
In case someone is curious, GT2 RS seemed to hit 312 kph:
Last edited by GrantG; 07-03-2019 at 12:12 AM.
#34
Addict
Rennlist Member
Rennlist Member
Oops, my bad...
#35
An engineer at Porsche once confided that one of the most challenging aspects of the modern 911 is the design of the rear tires. They are absolutely critical to making the rear engine layout viable, and thus are engineered to the maximum (or one might say within in an inch of their life). I’ve separately heard that the GT cars such as the GT3 don’t offer a rear seat option because the weight of additional passengers would require up-rating the rear tire load rating, negatively impacting performance.
Given this it’s perhaps surprising that the GT2 RS with an extra 100 lbs over the rear axle plus additional torque and speed potential uses the same tires as the GT3 RS. That car gets a 14% increase in rear tire load capacity over the GT3. Perhaps that’s enough for sufficient margin for the GT2 as well, but the failure noted above does make one wonder.
Given this it’s perhaps surprising that the GT2 RS with an extra 100 lbs over the rear axle plus additional torque and speed potential uses the same tires as the GT3 RS. That car gets a 14% increase in rear tire load capacity over the GT3. Perhaps that’s enough for sufficient margin for the GT2 as well, but the failure noted above does make one wonder.
The following 5 users liked this post by Petevb:
Agent_Orange (07-03-2019),
hellboy_mcqueen (06-03-2020),
I am the Walrus (07-03-2019),
JAhmed (07-09-2019),
TRAKCAR (07-03-2019)
#36
Rennlist Member
Interesting point Pete. With Manthey's bigger aero package you'd think if this was an issue they would either uprate / change the tire spec. I saw them running both Dunlop's and Cup2s on the MR 2RS.
#38
UPDATE
The tyre was sent back to the seller for a complaint examination.
The seller found no technical grounds to accept the complaint but offered a 75% refund (according with the tyre wear) for the single tyre in the name of prioritising customer satisfaction...
The tyre was sent back to the seller for a complaint examination.
The seller found no technical grounds to accept the complaint but offered a 75% refund (according with the tyre wear) for the single tyre in the name of prioritising customer satisfaction...
The following users liked this post:
mdrums (07-10-2019)
#39
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,413 Likes
on
2,516 Posts
And that's how you treat a customer. Good to see.
#40
Race Director
That’s a a very acceptable offer. Thanks for the update...this usually doesn’t happen around here.
#41
Bottom line, it's not really about the money but about the confidence in the essential element of the car.
All of that is lost.
If you track your car, can you still go fast on the autobahn?
I swapped my almost new second set of Dunlops back to Cup2s after seeing this failure.
All of that is lost.
If you track your car, can you still go fast on the autobahn?
I swapped my almost new second set of Dunlops back to Cup2s after seeing this failure.
#42
^^^ All tires can fail - about 18 months ago I had a new/near new Cup 2 N1 let go on track - basically charged hard through a fast double apex and was hitting close to 240 (KMH) on the straight when the TPMS came on showing low pressure in outside rear left. I got the speed off without over hard braking and managed to get through a right hander straight into pits - fortunately not a catastrophic failure but still a close run thing. e.g. flat within 30s and only recognised quickly due to TPMS. Michelin inspected the tire and replaced at no cost (after about 4 weeks). BTW this was delamination starting at the outer edge bottom seam (with leak occurring through the upper sidewall seam).
If you have an unusual failure stand your ground - on these cars Dunlop and Michelin will come to the party if there is a manufacturing defect (which is actually rare).
If you have an unusual failure stand your ground - on these cars Dunlop and Michelin will come to the party if there is a manufacturing defect (which is actually rare).
#43
This happened after only 12 heat cycles at Road Atlanta with my .2 RS. I had read through this thread and this one (https://rennlist.com/forums/991-gt3-gt3rs-and-911r/1154878-disappointed-with-the-new-dunlops-after-all-4.htm). You guys think it's a manufacturing defect? Started 27/28 cold and bled down to 32/34 hot. Stayed off the curbing for the first two laps, but I wonder if I should have stayed off the curbing for the entire first session (per Joe's comment elsewhere).
#44
Nordschleife Master
Originally Posted by bhf_clt
This happened after only 12 heat cycles at Road Atlanta with my .2 RS. I had read through this thread and this one (https://rennlist.com/forums/991-gt3-gt3rs-and-911r/1154878-disappointed-with-the-new-dunlops-after-all-4.htm). You guys think it's a manufacturing defect? Started 27/28 cold and bled down to 32/34 hot. Stayed off the curbing for the first two laps, but I wonder if I should have stayed off the curbing for the entire first session (per Joe's comment elsewhere).
#45
RL Community Team
Rennlist Member
Rennlist Member
This happened after only 12 heat cycles at Road Atlanta with my .2 RS. I had read through this thread and this one (https://rennlist.com/forums/991-gt3-gt3rs-and-911r/1154878-disappointed-with-the-new-dunlops-after-all-4.htm). You guys think it's a manufacturing defect? Started 27/28 cold and bled down to 32/34 hot. Stayed off the curbing for the first two laps, but I wonder if I should have stayed off the curbing for the entire first session (per Joe's comment elsewhere).