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Installed a fresh set of GT4RS Rear Axle Cooling ducts, they get beat up from dropping tires at the track apparently.
Swapped on my track wheels with the 71RZ, the front look much more meaty vs the RS, the measurements are really close to the same. Synced the TPMS sensors on my drive to Harbor Freight.
Installed the valve train to my beetle engine refresh, will get the engine ready to install this week.
J-Dub wrote: Sun Aug 30, 2026 7:56 pm
Installed a fresh set of GT4RS Rear Axle Cooling ducts, they get beat up from dropping tires at the track apparently.
Swapped on my track wheels with the 71RZ, the front look much more meaty vs the RS, the measurements are really close to the same. Synced the TPMS sensors on my drive to Harbor Freight.
Installed the valve train to my beetle engine refresh, will get the engine ready to install this week.
Dropping off on the outside of certain curbs? My ducts are still good but I guess I'll keep a closer eye on them.
Curious to hear about the Bridgestone RZ tires. Have you run anything outside of the RS versions for comparison?
I couldn't keep the back end in place last weekend - was horrible actually. It was an ordeal and lap times were horrid too. It was quite hot out which didn't help but it's been hot other times with no issues.
(On a side note, it was a track day sponsored by the venue itself and was the worst weekend for carnage they've had in a dozen years. Crashed was a C-8, a new Mustang, a 2009 GT2, yes a GT2. There were five incidents, none of them light. Not sure why anyone would put a GT2 on track for a track day - nice ones are bringing half a million and up with some reaching the 7-figure mark. His looked new and in fact he had owned it since new and was an experienced driver. Lost the back end coming out of Deception and that was it. He was ok fortunately but the car was destroyed. Very sad.
Anyway, a friend who was an IMSA top-level pro racer once upon a time long ago was visiting with me at the track. He still has contacts at Hoosier, so he called them Monday and their on-track pro rep told him the Track Attack Pros can go 8-12 cycles but that the #3 or #4 cycles are the sweet spot and they degrade gradually from 4 on. (That reminded me of the "two lap wonder" comment that you mentioned others were saying.) Another comment from the Hoosier guy was that as the tires wear and the rubber thickness is reduced, they are less flexible and have less grip.
He also said that the TAPros are very sensitive to heat cycling - they heat up fast and that, unknown to me, regular speed interstate trips to and from the track constitute definite heat cycle events. None of us figured that highway driving would be enough to count as a cycle, but apparently that's the case for the Hoosiers. (The AZ heat for you and the hot summer here apparently adds to the heat cycle events and subsequent deterioration.)
Using that criteria, I now realize that I had about 30 heat cycles on the tires which explains the lack of rear tire grip. The fronts were fine but I feel that's explained somewhat by the fact that the rears in our Caymans build up more heat far faster than the fronts. I'm thinking my back and forth interstate trips to and from the track might have affected the rears but not the fronts. Maybe?
Interestingly, it appears one can drive the Hoosiers to the cords and still have some grip as long as the heat cycles remain below 15 or so. That's not so good for someone who drives back and forth to the track in the track car. (I still have my trailer but I am done trailering to the track. Too old and tired for all the extra work! Lol.)
I've got another set of Hoosiers going on this week but I think I need to go back to the MPSC2s or the new RZs and see how they compare, so looking forward to your feedback. Info such as how many heat cycles and how many track miles you achieve, as well as performance as they wear, etc. would be helpful Jeremy!
Tim Current: '26 911 Carrera S - PTS Verde British Racing Green
'24 Cayenne S - Algarve Blue Metallic
'21 718 Cayman GTS - Black
'22 911 Turbo S - Carmine Red
'21 718 Cayman GT4 - White
'11 GMC 1500 Quad Cab 4x4 - Black Musik-Stadt Region
My baseline is the RS so I will use that to compare to the RZ. Now I wish I switched to them mid season when I could do the same track back to back.
My understanding is that highway does not count as heat cycling as well, dang if that counts that can really explain the fall off. Especially when I run many days at a smaller track that is easy on tires.
I also don't trailer, seems like that takes the simple fun out of things.
J-Dub wrote: Mon Aug 31, 2026 12:06 pm
My baseline is the RS so I will use that to compare to the RZ. Now I wish I switched to them mid season when I could do the same track back to back.
My understanding is that highway does not count as heat cycling as well, dang if that counts that can really explain the fall off. Especially when I run many days at a smaller track that is easy on tires.
I also don't trailer, seems like that takes the simple fun out of things.
To be specific, the highway heat cycle comment from the Hoosier person was only referring to the Track Attack Pros since they heat up easily and almost instantly. My takeaway guess (and what I'm going by for now) was that the Hoosiers are more sensitive to a highway heat cycle than other DOT 200 or similar treadwear tires.
Tim Current: '26 911 Carrera S - PTS Verde British Racing Green
'24 Cayenne S - Algarve Blue Metallic
'21 718 Cayman GTS - Black
'22 911 Turbo S - Carmine Red
'21 718 Cayman GT4 - White
'11 GMC 1500 Quad Cab 4x4 - Black Musik-Stadt Region
Today I took my Boxster S to a motor-sports consignment store.
I temporarily own three 718s, which is one too many, so the BS must go. It's a marvelous vehicle, of course, and still runs and feels like new. The buyer will get a great car. But I never really bonded with it, probably because it was not a Spyder. So off it goes to make room for the Spyder that I was too frugal to buy in the first place.
ReidMcT wrote: Tue Sep 01, 2026 8:08 pm
Today I took my Boxster S to a motor-sports consignment store.
I temporarily own three 718s, which is one too many, so the BS must go. It's a marvelous vehicle, of course, and still runs and feels like new. The buyer will get a great car. But I never really bonded with it, probably because it was not a Spyder. So off it goes to make room for the Spyder that I was too frugal to buy in the first place.
All's well as I'm sure a very good Boxster will get a good new home.
Tim Current: '26 911 Carrera S - PTS Verde British Racing Green
'24 Cayenne S - Algarve Blue Metallic
'21 718 Cayman GTS - Black
'22 911 Turbo S - Carmine Red
'21 718 Cayman GT4 - White
'11 GMC 1500 Quad Cab 4x4 - Black Musik-Stadt Region
As blueline noted some times Porsches can be difficult to see, but since it is even more difficult to find a new2025, your nice used one may pique more interest now and the months ahead.
Then, with my X431, I coded the Auto Stop/Start to remember its last setting (typically OFF) and also enabled Power Steering Plus. I forgot to enable 4-point headlights, but I'll do that soon.
