2015 Porsche 911 GT3 Cup
Presentation
This 2015 Porsche 911 GT3 Cup is a 991.1-generation factory race car that has been used primarily for Club-style events. Power is provided by a 3.8-liter flat-six linked with a six-speed sequential transaxle and a limited-slip differential, and equipment includes the Accessory Package, an air-jack system, a rear wing, tow hooks, xenon headlights, 18″ center-lock wheels, a Sabelt racing harness, a roll cage, a fuel cell, and a fire-suppression system along with a Bosch Motorsport anti-lock system and a ChillOut driver-cooling system, and the engine and gearbox were reportedly rebuilt at 11,300 kilometers along with installation of a replacement clutch. Acquired by the current owner in 2022, and this 991.1 GT3 Cup is now offered in Southbury, Connecticut, with service records, spare parts, an extra set of wheels, and a bill of sale.
Compared to the 997, the 991-generation GT3 Cup featured a 100mm-extended wheelbase and aluminum-steel hybrid construction. The doors, engine cover, and rescue hatch in the roof are all composed of carbon-reinforced plastic (CFRP), and polycarbonate windows were fitted in place of the side and rear glass. The front bodywork was revised for the Cup, and a roll bar was integrated along with tow points and roof-mounted connectors for recovery eye bolts. The bodywork of this example is finished in white beneath a red, black, and gray camouflage-style vinyl livery. Blemishes are noted on the bodywork, and scuffs are visible on the driver side. The right-side lower rocker panel was replaced in September 2021.
Silver-finished 18″ center-lock forged alloy wheels are mounted with Pirelli P Zero tires measuring 27/65-18 up front and 31/71-18 at the rear. The front axle design is a MacPherson strut-type axle with aluminum transverse control arms, and the rear axle uses a multi-link setup, and adjustable coilovers, uniball joints, and adjustable double-blade-style roll bars. Single-piece 380mm steel rotors are matched with six-piston front and four-piston rear aluminum calipers, and the system has two main hydraulic cylinders, adjustable brake balance, and a Bosch Motorsports anti-lock system. The car also features air jacks and hydraulic power steering, and a control arm was replaced in 2025.
Seller Video
Bids & Comments
AuthenticAuctions (The Seller) 4
Sep 25, 2026 · 20:04
*Caveat here on the hours.. the 43 stated earlier was based on average speed from chassis logs.. using the motor DME snapshot we get lower average speeds, thus higher hours... and thus the variance here. The easy to reference known quantity here is 5k KM's since last rebuild. That is what we can most confidently sight. Hope that seems reasonable.
AuthenticAuctions (The Seller)
Sep 25, 2026 · 19:57
@TVr-851 Yeah its all a bit confusing... we know the motor KM's and hours where not cleared out when it was rebuilt in 2021. And this is why Daniel Jacobs suspects this was the second rebuild... he suspects at the first rebuild they replaced or reset the ECU. The 2021 rebuild was done with 11,304 KM's logged, this is a motor KM reading, not the chassis. The DME for the motors KM's now shows 16,777. With this we know the motor and trans have about 5,473 KM's since the rebuild.
This is our second 991 Cup and the first one was a crash course in expected maintenance scheduling for these cars. Yes, Porsche tech guides say these motors should be rebuilt every 100 hours... but that is based on them being campaigned and raced hard. It's not based on them running track day weekend warrior events... which is what this car has been used for at least since the last rebuild. Daniel Jacob's stance is that these motors are incredibly versatile and as long as you maintain them properly, driving them on normal track days well over 100 hours is totally fine. I know this is much debated, but as a prior GT3 owner, it checks with my logic and experiences with these motors.
To summarize, it is our understanding that the car has roughly 215 hours logged on the motor DME, with two rebuilds happening during that span, one being at zero hours on the time span, and the other happening at roughly 145-155 hours... it just happens to be that we only have one of them fully documented.
@HedrickHSS Anybody is welcome to contact Autometrics on this car. Not sure what they will be able to provide in addition to the info here, but feel free.
We'll do whatever we can to ease doubt or concern here on the car.. everything we have seen tells us the car has been really well cared for and is ready to rock for many hours without anything beyond standard track car maintenance.
This is our second 991 Cup and the first one was a crash course in expected maintenance scheduling for these cars. Yes, Porsche tech guides say these motors should be rebuilt every 100 hours... but that is based on them being campaigned and raced hard. It's not based on them running track day weekend warrior events... which is what this car has been used for at least since the last rebuild. Daniel Jacob's stance is that these motors are incredibly versatile and as long as you maintain them properly, driving them on normal track days well over 100 hours is totally fine. I know this is much debated, but as a prior GT3 owner, it checks with my logic and experiences with these motors.
To summarize, it is our understanding that the car has roughly 215 hours logged on the motor DME, with two rebuilds happening during that span, one being at zero hours on the time span, and the other happening at roughly 145-155 hours... it just happens to be that we only have one of them fully documented.
@HedrickHSS Anybody is welcome to contact Autometrics on this car. Not sure what they will be able to provide in addition to the info here, but feel free.
We'll do whatever we can to ease doubt or concern here on the car.. everything we have seen tells us the car has been really well cared for and is ready to rock for many hours without anything beyond standard track car maintenance.
Sep 25, 2026 · 19:43
I'd recommend calling Autometrics. I'm sure they would have the records on the rebuild. Nice looking car for sure! Somebody buy this and bring it to HSR at Daytona in November!!
Sep 25, 2026 · 18:52
Nicely prepared ad, well done - can you please clarify hrs / kms since last rebuild?
Based on the reciepts, Autometrics rebuild was done in 2021 @ 11k km, at which point I’m anssuming the DME was reset.
The engine hours on a reciept from Jacobs in mid 2025 say 210hrs / 16777kms on the engine, which I’m reading as hours since the Autometrics rebuild.
Was there another rebuilt done recently that ties to 40ish hours of use? Maybe the DME wasn’t reset again?
Thanks in advance
Based on the reciepts, Autometrics rebuild was done in 2021 @ 11k km, at which point I’m anssuming the DME was reset.
The engine hours on a reciept from Jacobs in mid 2025 say 210hrs / 16777kms on the engine, which I’m reading as hours since the Autometrics rebuild.
Was there another rebuilt done recently that ties to 40ish hours of use? Maybe the DME wasn’t reset again?
Thanks in advance
Sep 25, 2026 · 18:50
Nicely prepared ad, well done - can you please clarify hrs / kms since last rebuild?
Based on the reciepts, Autometrics rebuild was done in 2021 @ 11k km, at which point I’m anssuming the DME was reset.
The engine hours on a reciept from Jacobs in mid 2025 say 210hrs / 16777kms on the engine.
Was there another rebuilt done recently that ties to 40ish hours of use? Maybe the DME wasn’t reset again?
Based on the reciepts, Autometrics rebuild was done in 2021 @ 11k km, at which point I’m anssuming the DME was reset.
The engine hours on a reciept from Jacobs in mid 2025 say 210hrs / 16777kms on the engine.
Was there another rebuilt done recently that ties to 40ish hours of use? Maybe the DME wasn’t reset again?
AuthenticAuctions (The Seller)
Sep 25, 2026 · 18:49
Welcome to the auction for this 991 GT3 Cup. It is well setup and looks the part... and yes, these car are absolute track weapons... but the biggest stand-out feature with this car is the $63k full rebuild done by Autometrics Motorsports. The car has logged 43 hours of club driving since. It is believed there was likely another rebuild in this car's history based on how it was used and the hours on it, but we only have invoices for the most recent one. For the past few years this car has been maintained by Daniel Jacobs LLC, a Porsche specialty shop in CT. They change all the fluids after a track weekend, and they monitor motor health, performing regular leak-down testing. This is car is fully sorted and ready to go for club events. As mentioned, it comes with a complete second set of wheels and tires.
@gregoryindiana Seller is saying that drivers side hit to the rocker happened about 2 years ago.. he believes another car may contact with a tire while racing. Like you said, nothing too crazy to get fixed if somebody wanted to. The seller loves this car but my understanding is that they ran into some health issues that are taking them out of track driving.
Keep the questions coming... we'll get everything addressed.
Happy bidding!
@gregoryindiana Seller is saying that drivers side hit to the rocker happened about 2 years ago.. he believes another car may contact with a tire while racing. Like you said, nothing too crazy to get fixed if somebody wanted to. The seller loves this car but my understanding is that they ran into some health issues that are taking them out of track driving.
Keep the questions coming... we'll get everything addressed.
Happy bidding!
AuthenticAuctions (The Seller)
Sep 25, 2026 · 18:48
Welcome to the auction for this 991 GT3 Cup. It is well setup and looks the part... and yes, these car are absolute track weapons... but the biggest stand-out feature with this car is the $63k full rebuild done by Autometrics Motorsports. The car has logged 43 hours of club driving since. It is believed there was likely another rebuild in this car's history based on how it was used and the hours on it, but we only have invoices for the most recent one. For the past few years this car has been maintained by Daniel Jacobs LLC, a Porsche specialty shop in CT. They change all the fluids after a track weekend, and they monitor motor health, performing regular leak-down testing. This is car is fully sorted and ready to go for club events. As mentioned, it comes with a complete second set of wheels and tires.
@gregoryindiana Seller is saying that drivers side hit to the rocker happened about 2 years ago.. he believes another car may contact with a tire while racing. Like you said, nothing to crazy to get fixed if somebody wanted to. The seller loves this car but my understanding is that they ran into some health issues that are taking them out of track driving.
Keep the questions coming... we'll get everything addressed.
Happy bidding!
@gregoryindiana Seller is saying that drivers side hit to the rocker happened about 2 years ago.. he believes another car may contact with a tire while racing. Like you said, nothing to crazy to get fixed if somebody wanted to. The seller loves this car but my understanding is that they ran into some health issues that are taking them out of track driving.
Keep the questions coming... we'll get everything addressed.
Happy bidding!
AuthenticAuctions (The Seller)
Sep 25, 2026 · 18:48
Welcome to the auction for this 991 GT3 Cup. It is well setup and looks the part... and yes, these car are absolute track weapons... but this biggest stand-out feature with this car is the $63k full rebuild done by Autometrics Motorsports. The car has logged 43 hours of club driving since. It is believed there was likely another rebuild in this car's history based on how it was used and the hours on it, but we only have invoices for the most recent one. For the past few years this car has been maintained by Daniel Jacobs LLC, a Porsche specialty shop in CT. They change all the fluids after a track weekend, and they monitor motor health, performing regular leak-down testing. This is car is fully sorted and ready to go for club events. As mentioned, it comes with a complete second set of wheels and tires.
@gregoryindiana Seller is saying that drivers side hit to the rocker happened about 2 years ago.. he believes another car may contact with a tire while racing. Like you said, nothing to crazy to get fixed if somebody wanted to. The seller loves this car but my understanding is that they ran into some health issues that are taking them out of track driving.
Keep the questions coming... we'll get everything addressed.
Happy bidding!
@gregoryindiana Seller is saying that drivers side hit to the rocker happened about 2 years ago.. he believes another car may contact with a tire while racing. Like you said, nothing to crazy to get fixed if somebody wanted to. The seller loves this car but my understanding is that they ran into some health issues that are taking them out of track driving.
Keep the questions coming... we'll get everything addressed.
Happy bidding!
Sep 25, 2026 · 18:30
Raced against this car a few times when it was with, what i assume to be its previous owner. Very cool car & well prepped!
Sep 25, 2026 · 18:17
I say this Cup ranks high on the weapons grade scale. I often wonder whether the driver aged out of Club Racing, decided it wasn't for them long term for other reasons, couldn't get insured any longer, or moved up in the racing world to faster or higher profile racing.
Nothing wrong on the surface that should be a hard fix; would be nice to know more about what happened down low on that left side door area, and how long ago.
Good luck on this auction!
Nothing wrong on the surface that should be a hard fix; would be nice to know more about what happened down low on that left side door area, and how long ago.
Good luck on this auction!
redmonkey928
Bid
Sep 25, 2026 · 18:11
Bid in the amount of $55,000
Sign In to Comment
Please sign in or create an account to join the auction discussion.