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Video of the first shakedown. Completely stock engine/exhaust. On 245/35-20 and 305/30-20 Cup 2's. Fun to watch the mingling with Cup cars at the end. Driver: Mike Skeen. https://youtu.be/1k8IIHw1cQk
stock PDK, correct? what’s the noise that sounds like (straight cut) transmission whine?
Interesting, so you can use the RWS with cup hubs and uprights. That's the answer I am trying to figure out.
We didn't use Cup uprights on this build. We kept them all stock and the RWS.
The RWS mechanism won't bolt on to Cup uprights. It'd require modifications and geometry testing. Where there's a will there's a way...
Amazing build. Sub'ed. For the folks who go this far, what's your logic vs. just buying a low-hour Cup car? Service intervals and associated cost on the cup car is nothing to laugh at (engine in particular), but I always figured it would still make sense "at some point" vs. continuing to chase Cup car performance in my street car. Around here we see some RWS motor overheating with slicks on hot days, but that seems to be pretty addressable just with some air ducting. Thanks for sharing!
For the folks who go this far, what's your logic vs. just buying a low-hour Cup car? Service intervals and associated cost on the cup car is nothing to laugh at (engine in particular), but I always figured it would still make sense "at some point" vs. continuing to chase Cup car performance in my street car.
Using hourly average over 100 hours, the scheduled rebuild for Cup engine + transmission comes to ~$950/hour.
To buy a factory GT3 street car replacement engine + PDK transmission from a Porsche dealer divided by 100 hours is ~$560/hour, that's assuming replacing the engine + transmission at 100 hours, which usually can go well beyond 100 hours(50 track days @ 2 hours a day).
The yearly tire cost, brake pads, rotors, wheel bearings, suspension joints is dependent on the tire compound choice. These numbers will be higher using slicks vs. r-comps.
This car will race on r-comps(against other cars on r-comps) so the consumable cost isn't at Cup level.
Using hourly average over 100 hours, the scheduled rebuild for Cup engine + transmission comes to ~$950/hour.
To buy a factory GT3 street car replacement engine + PDK transmission from a Porsche dealer divided by 100 hours is ~$560/hour, that's assuming replacing the engine + transmission at 100 hours, which usually can go well beyond 100 hours(50 track days @ 2 hours a day).
The yearly tire cost, brake pads, rotors, wheel bearings, suspension joints is dependent on the tire compound choice. These numbers will be higher using slicks vs. r-comps.
This car will race on r-comps(against other cars on r-comps) so the consumable cost isn't at Cup level.
Tom, thanks for breaking the costs down, I was wondering the same thing. Very nice build as usual from TPC.
Thanks for the info Tom. Makes sense. It really is all about that drivetrain.
This is Bruce from BRracing (Los Gatos, California).
We are a DSC dealer as well. We have almost the same build here currently on the West Coast.
The idea is along the lines of building a GT3 Clubsport.
Now that there are GT4 Clubsports, GT2RS Clubsports, the same lines / objectives / costs / benefits of a "Clubsport" vs the full Cup are applied.
We have a 991.1 GT3 w Cup front bumper, Cup front flares, Cup rear decklid, Cup rear wing, Cup brake ducts, custom BBS E88 wheels that allow F = 295, R = 345 tires, GiroDisc upgraded 2-piece rotors, stock red Porsche GT3 calipers. Endless brake pads, Endless brake fluid.
Novelli full Cup control arms / thrust arms. Solid / adj thrust arm bushings, all other bushings solid. Stock dynamic eng mounts. Stock PDK. Stock RWS. Tractive coil-overs w custom spring rates.
Car is very close to a CUP in terms of driving feel, but a little softer, easier to drive.
This is Bruce from BRracing (Los Gatos, California).
We are a DSC dealer as well. We have almost the same build here currently on the West Coast.
The idea is along the lines of building a GT3 Clubsport.
Now that there are GT4 Clubsports, GT2RS Clubsports, the same lines / objectives / costs / benefits of a "Clubsport" vs the full Cup are applied.
Hi Bruce! Our sentiments exactly!
We're are going do more builds to fill the need for this level of modern-car performance and safety less the Cup operating budget.
Appropriately, we dub this build as TPC Clubsport # 001.
was on track with this car today at Rd atl. this thing rips!!! going to be fun racing with it this weekend. (i should say flying by us all weekend hah)
SJS Motorsports entered car #308 GT3 Clubsport Build by TPC Racing in AER(American Endurance Racing) double 8-hour race at Michelin Raceway Road Atlanta with drivers Trevor Andrusko and Scott Schmidt. During Friday practice #308 was running 1:29's on Michelin Cup 2 tires! Even though this car is very quick, the competition is stiff among Porsche 991 Cup, BMW M4 GT4, and Ford Boss 302R (all competitors on DOT-approved, 180 or higher tread wear rating street tires). On Saturday, the team experienced a bit of bad luck with contaminated fuel from an outside gas station. The team replaced the fuel pump and flush out the bad fuel. The team's hard work paid off, Sunday was back in business! The engine, PDK, DSC Sport Tractive suspension, and PFC brakes performed flawlessly throughout the Sunday's 8-hour race in wet and dry conditions. Andrusko and Schmidt drove brilliantly the entire race against fierce competition to take #308 and SJS Motorsports' to a strong 3rd place overall finish! Despite of Saturday's misfortune, the maiden voyage race ended on a high note. Congratulations to the drivers and the team!
#308 and SJS Motorsport will return for the next AER race...with increased fuel tank capacity from the standard 16.9 gallons to reduce the number of fuel stops. This will narrow the competitor's advantage.
02-07-2020, 10:04 PM
