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High transmission temperature after several hard laps

DetailTunerCommunity StarterJun 28, 20262006 Mazda RX-8 SportRaleigh
2006 Mazda RX-8 Sport, about 78,000 miles. After several laps the transmission temp rises enough that shifting behavior changes. Car cools down and works normally again. Looking for data points on cooling upgrades versus simply shortening sessions. If I fix it I'll come back and update the thread.
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13 replies

SmoothWrench26Community StarterCommunity StarterJun 28, 2026permalink
Write down what you already tried. A second data point from another 2006 Mazda RX-8 owner helps more than a generic diagnosis. Then you'll know the next fork. The universe charges extra for guessing. This is the version I'd tell a friend.
JDMHunterCommunity StarterCommunity StarterJun 28, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2006 Mazda RX-8, a specialist hour can be cheaper than another round of parts. That's where I'd start. Write the result down so the next test isn't a repeat of the last one. I'm in no rush to be a hero on it.
ColdStartDaily13Community StarterCommunity StarterJun 28, 2026permalink
Owner notes beat generic advice here. On the 2006 Mazda RX-8 in Raleigh, I'd fix the thing you'll notice every day before chasing spec-sheet extras. Then you'll know the next fork. On “high transmission temperature after several hard laps,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Climate here is different, so treat that as a local data point. That's my plan before I call anyone.
ColdStartDaily13Community StarterCommunity StarterJun 28, 2026permalink
Owner notes beat generic advice here. On the 2006 Mazda RX-8 in Raleigh, I'd fix the thing you'll notice every day before chasing spec-sheet extras. I'd do that before spending real money. On “high transmission temperature after several hard laps,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. I'd rather look cautious in this thread than stuck later.
TrackWeekend48Community StarterCommunity StarterJun 28, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 2006 Mazda RX-8 before a big repair or a big spend. I'd do that before spending real money. This is from a 2006 Mazda RX-8 in Raleigh with 78,000 miles. Just my two cents from doing this recently. Your commute and mine probably aren't the same, but the test still applies. I'll update if anything new shows up.
JDMHunterCommunity StarterCommunity StarterJun 28, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 2006 Mazda RX-8 before a big repair or a big spend. That's where I'd start. Keep sale price, fees, and rate as three different conversations. Doing the boring step first on purpose.
JDMHunterCommunity StarterCommunity StarterJun 28, 2026permalink
Write down what you already tried. A second data point from another 2006 Mazda RX-8 owner helps more than a generic diagnosis. Then you'll know the next fork. Keep sale price, fees, and rate as three different conversations. If this is nothing, great. I want that in data.
DetailTunerCommunity StarterCommunity StarterJun 30, 2026permalink
I parked the 2006 Mazda RX-8 and wrote down what I already tested so I'm not repeating myself. If the story changes I'll post the new data.
SmoothWrench26Community StarterCommunity StarterJun 29, 2026permalink
Write down what you already tried. A second data point from another 2006 Mazda RX-8 owner helps more than a generic diagnosis. That's where I'd start. The universe charges extra for guessing. Might be overthinking it, but I'd rather overthink than overspend.
TrackWeekend48Community StarterCommunity StarterJun 29, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2006 Mazda RX-8, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. Not gospel, but it saved me a headache. I'm in no rush to be a hero on it.
SmoothWrench26Community StarterCommunity StarterJun 29, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2006 Mazda RX-8, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. Parts cannon is a personality type I try to avoid. If the story changes I'll post the new data.
ColdStartDaily13Community StarterCommunity StarterJun 29, 2026permalink
Owner notes beat generic advice here. On the 2006 Mazda RX-8 in Raleigh, I'd fix the thing you'll notice every day before chasing spec-sheet extras. That's where I'd start. On “high transmission temperature after several hard laps,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Wrote this up on my lunch break.
ColdStartDaily13Community StarterCommunity StarterJun 29, 2026permalink
Owner notes beat generic advice here. On the 2006 Mazda RX-8 in Raleigh, I'd fix the thing you'll notice every day before chasing spec-sheet extras. That's where I'd start. On “high transmission temperature after several hard laps,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Climate here is different, so treat that as a local data point. Wrote this up on my lunch break.
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