Openai/6958bb78-4a08-8010-8f27-a7bc04c43022

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gpt-5-2

User: Would depressing the clutch on a 2024 manual supra cause the rpms to not go up when you're pressing on the gas?

Would depressing the clutch on a 2024 manual supra cause the rpms to not go up when you're pressing on the gas? The car is in neutral and when pressing the gas, the rpms rise, but as soon as you press the clutch pedal, the rpms stop rising. Car drives perfect and doesn't hesitate. Is this normal?

Assistant: Short answer: yes — that behavior is normal on the manual Supra.

Short answer: yes — that behavior is normal on the manual Supra. 👍 What you’re seeing is a factory ECU behavior, not a clutch or engine problem.

Why it happens

On the 2024 manual Supra (BMW B58 + iMT logic), the ECU does a few things when it detects the clutch pedal is pressed:

• Limits or ignores throttle input when the clutch is fully depressed
• Prevents the engine from free-revving unnecessarily
• Helps protect the drivetrain and smooth shifts
• Works in conjunction with rev-matching / anti-rev hang logic

So:

• Neutral, clutch out → RPMs rise normally
• Neutral, clutch in → RPMs stop responding (or rise very slowly / not at all)

That’s exactly what you described.

Why Toyota/BMW programmed it this way

• Reduces shock loads when re-engaging the clutch
• Cuts down on driveline abuse and mis-shifts
• Helps meet emissions and noise regulations
• Makes the car harder to money-shift or over-rev while disengaged

What would not be normal

These would be red flags (which you don’t have):

• RPMs dropping or stalling when clutch is pressed
• Hesitation or lack of power while driving
• Slipping clutch under load
• Check engine light or clutch engagement issues

Since you said:

Car drives perfect and doesn't hesitate

That strongly confirms this is normal ECU behavior, not a mechanical fault.

Extra note (if you're curious)

Many owners notice this more when:

• Car is cold
• iMT (rev-matching) is enabled
• Stock tune (it often changes or disappears with aftermarket tunes)

If you want, I can:

• Explain how this differs from older manual cars
• Tell you how to test clutch health properly
• Explain how aftermarket tunes affect this behavior

But as it sits — your Supra is behaving exactly as designed. ✅