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Tom, have you had any of your builds have issues with heating issues between the engine and PDK, we seem to have issues in the west with our desert tracks?
Thanks, Mike
We have not had heating issues running east coast and central tracks in the Summer with ambient temp in the 90's F. We do remove the front bumper to clean out the radiators during service like we do on Cup cars.
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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
The signal and power are from OEM 3rd brake light.
How did you mount that rain light? custom made bracket? I can't tell from the pics but if I were to design a bracket, it probably would use the license plate mounting holes.
I didn't look that close to how it was mounted when I was in New Jersey but it appears to be mounted by a bracket to the license plate light location. This makes sense to as it would make it easier and cleaner to run the power wires for the LifeLine rain light.
How did you mount that rain light? custom made bracket? I can't tell from the pics but if I were to design a bracket, it probably would use the license plate mounting holes.
It is mounted by a simple L-shaped bracket made from sheet metal.
Tom, what has your experience been with engine failures in the 991.1 GT3 cars? The replacement engine in my car failed after about 8K miles, and I'm getting the next replacement engine installed this week.
Tom, what has your experience been with engine failures in the 991.1 GT3 cars? The replacement engine in my car failed after about 8K miles, and I'm getting the next replacement engine installed this week.
Experience has been good with G engine. We change oil on this car after each race. For HPDE cars we change oil every 5-6 track days.
Thanks for the quick response on the PDK, both my GT3's have had the PDK replaced under warranty both tracked a lot. Dealer says about 1K to do this service Does that sound right?
Experience has been good with G engine. We change oil on this car after each race. For HPDE cars we change oil every 5-6 track days.
Originally Posted by Tom@TPC Racing
PDK fluid and differential oil after each race weekend. For HPDE cars we do every other oil engine, 10-12 HPDE days.
Those fluid changes are much more frequent (and costly) than what's recommended in the Porsche maintenance schedule for track use. Do you have any data which supports the conclusion that doing more frequent fluid changes extends the engine and PDK life?
Thanks for the quick response on the PDK, both my GT3's have had the PDK replaced under warranty both tracked a lot. Dealer says about 1K to do this service Does that sound right?
Those fluid changes are much more frequent (and costly) than what's recommended in the Porsche maintenance schedule for track use. Do you have any data which supports the conclusion that doing more frequent fluid changes extends the engine and PDK life?
Nop. Just going with what we know to work for us. For the decades we've been in business and racing cars we have never went by what Porsche and Motorsport says for maintenance schedule. We do maintenance more frequently. It is a personal choice to do more than what is necessary to potentially be in a more favorable position. I am sure we aren't the only race team/shop that feel this way. IMHO, there's just no free lunch in running a 8500+rpm engine that produces 125hp per litre paired with a transmission that works equal to(or better than) a full racing gearbox of recent past. This is getting too personal but I even feel guilty and have empathy for the equipment when running towards the end of each maintenance cycle.
Last edited by Tom@TPC Racing; 12-01-2020 at 04:50 PM.
Nop. Just going with what we know to work for us. For the decades we've been in business and racing cars we have never went by what Porsche and Motorsport says for maintenance schedule. We do maintenance more frequently. It is a personal choice to do more than what is necessary to potentially be in a more favorable position. I am sure we aren't the only race team/shop that feel this way. IMHO, there's just no free lunch in running a 8500+rpm engine that produces 125hp per litre paired with a transmission that works equal to(or better than) a full racing gearbox of recent past. This is getting too personal but I even feel guilty and have empathy for the equipment when running towards the end of each maintenance cycle.
During my last track day this season, I kept thinking - how can the car handle all these screaming revs? - and I was bragging about how durable the car is for track use. Then, last session of the day, the engine blew. So I know the feeling.
Tom, care to disclose which oil you're using? Clearly you guys are doing something right.
M1 0w-40 on street cars and Cup cars. I know that there are other brands of motor oil that are advertised to have higher Zinc and Phosphorus but at the frequency of our service interval I don't think it matters. About that, I sort of have a silly theory that I discussed with someone yesterday in a casual convo. That is, what ifthe OEM recommended oil change interval is based on engine load per mile with average of a spectrum driver skill level? i.e., an intermediate skill level driver will typically have less full throttle time per lap or per mile of track use compared to an advanced skill level driver. This changes the load to the engine and the load to the additive package in the motor oil. I have absolute no fact to support my theory so changing the oil more frequently is better than not. Plus during the more frequent oil changes presents more frequent opportunities to inspect the oil filters to look for signs of possible future issues.