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awesome job this weekend! pointing you guys by and hearing her sing was lovely. also an awesome thing about this car/build is rocking out on the Sirius XM during the black flag. hah (we were next to you in the chrome wrapped E36 during that delay.
Does this car have the original motor or the latest Porsche G replacement motor. You mentioned the car had 29K miles when you started the project and the owner wanted to keep the motor stock but I didn't see anything else mentioned about that.
Good question. I contacted our local Porsche dealer this morning to request a VIN search on repair history. This car does have the G replacement engine in it for about 2 years. G engine is holding up great.
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PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
Congrats guys. I love following this build. How often did you have to perform a tire change, and what tools did you use to get it done quickly with the factory centerlocks?
Thanks! This car is a lot of fun to build and drive. We run the same one set of Cup 2 tires for the entire 8-hour race with five mandatory 3-minute pit stops(for fueling, driver change, checking over the car, cleaning the windshield, etc.). A tire change during the race would only occurs when there's an unexpected tire issue, or switching from dry to rain tires. The same type of impact gun for Cup cars is used for the factory street car CL. We don't recommend impact gun on street cars that wants to keep the CL nut looking fresh, but for racing its okay. The CL nuts are replaced when needed.
Thanks! This car is a lot of fun to build and drive. We run the same one set of Cup 2 tires for the entire 8-hour race with five mandatory 3-minute pit stops(for fueling, driver change, checking over the car, cleaning the windshield, etc.). A tire change during the race would only occurs when there's an unexpected tire issue, or switching from dry to rain tires. The same type of impact gun for Cup cars is used for the factory street car CL. We don't recommend impact gun on street cars that wants to keep the CL nut looking fresh, but for racing its okay. The CL nuts are replaced when needed.
wow, so the cup 2 tire pics posted earlier were after a 8 hour race? That’s impressive wearing
characteristics.
SJS Motorsports 991 GT3 Clubsport swept the podium at AER PittRace this weekend with drivers Trevor Andruko and Mike Skeen. This is the 4th consecutive AER 8-hour race wins for 991 GT3 Clubsport built and supported by TPC Racing. Congratulations to Scott Schmidt, Trevor Andrusko, Mike Skeen, and the entire team!
Between the four 8-hour endurance races, 4-hour qualifying races, and practice sessions the only services required were fluid changes and consumables. The G engine continues to run strong. The DSC Sport active suspension and PFC brakes has proven to be a winning combination.
Next race is AER @ Lime Rock.
Last edited by Tom@TPC Racing; 07-20-2020 at 08:59 AM.
Reason: 991 GT3 Clubsport Dominates @ PittRace
We find the wear rate of everything to be different versus when the total time is spread out in 20-30 minute session with time in between for cool down. Depending on type of car and setup, there are teams that requires changing tires. Also in fender to fender competition the wear rate of consumable is different from constantly making moves that's not often made in HPDE type events.
We find the wear rate of everything to be different versus when the total time is spread out in 20-30 minute session with time in between for cool down. Depending on type of car and setup, there are teams that requires changing tires. Also in fender to fender competition the wear rate of consumable is different from constantly making moves that's not often made in HPDE type events.
So net effect, do the tires have more hours of life in racing or in DE?
From my experience, tires generally last longer in DE than in competition. Which frankly is expected.
That's what I figured, but I was wondering if DE heat cycles might reduce longevity of the tires. My experience with Cup 2 on the 991 GT3 has been that front tires are done when the rubber is gone, rear tires will heat-cycle out long before the rubber is gone. Others have reported the same experience. Any idea why that happens? Does that happen with your race build car?
That's what I figured, but I was wondering if DE heat cycles might reduce longevity of the tires. My experience with Cup 2 on the 991 GT3 has been that front tires are done when the rubber is gone, rear tires will heat-cycle out long before the rubber is gone. Others have reported the same experience. Any idea why that happens? Does that happen with your race build car?
I think an OE Tire Engineer is going to provide the most comprehensive and accurate answer for your question. As a Mechanic, my best common sense guess is because the front tires are subjected to more dynamic load for it relative size than the rear tires as a result of braking and cornering. The material wear of the rear tires should be less than the front tires due the rear tires much larger mass, nonetheless the remaining material is still affected by heat cycling. The situation would be different if lets say two turbos were added to the engine. On top of the dynamic load to mass ratio, these modern long-wheel base cars tend to push so the front tires can wear like coarse sandpaper on wood, thus, the likelihood of wearing down the front tire material before heat cycling out is high. Other factors to consider are tire construction/compound between front to rear, and external factors such as track layout, track conditions, the car's setup, and of course the driver.
Here's an exciting video from last weekend with Trevor Andrusko wheeling the #308 SJS Motorsports/TPC Racing 991.1 GT3 Clubsport battling the #36 BRZ06 (Yes, you read it correctly, a race-prepped BRZ with Z06 motor, ~2200 lbs). Good clean racing by both drivers. If you like this video, subscribe to @Tandrusko , @Mike Skeen , @TPC Racing on youtube to see other exciting racing videos.
06-29-2020, 07:21 PM
