moody engine or clutch slipping ?

saiko21 said:

I am driving a 2019 Civic Si. I have a feeling that my car is not performing well. I drove 5000 mile on my current oil (Mobil 1 extended performance). I have a question about clutch. How can I test a clutch is slipping on a turbo charged car. I have experience with naturally aspirated engines where the RPM jumps if a clutch slips. I wanted to confirm if it's tires or clutch or just engine behavior
Thank you

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joshhjackson2112 said:

From experience: I always thought that feeling of loosing power was possibly from the clutch slipping. I am not sure if there is mild slippage or aggressive slippage. A week or so ago, I really felt my stock clutch slip. You will deff know it when it happens. The engine revs loud like you are mashing the gas while parked and your car doesn't accelerate as expected. I used to have a lot of mild loss in acceleration (before I replaced my clutch) but I think that was possibly heat soak or maybe it was the clutch not quite grabbing the power good enough....? There is a lot of this experience on this so maybe more people will chime in.

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REBELXSi said:

High RPM shifts are a good test.

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saiko21 said:

What do you mean by high rpm shift. Do you mean I should shit at the shift light point and check? What should I check at that point

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REBELXSi said:

I mean you up shift at close to redline and if your RPMs don't drop immediately when you release the clutch pedal, your clutch is slipping.

To rule out traction issues, chose a higher gear to test.

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saiko21 said:

Ok will check on freeway and post update thanks

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REBELXSi said:

I mean you up shift at close to redline and if your RPMs don't drop immediately when you release the clutch pedal, your clutch is slipping.

To rule out traction issues, chose a higher gear to test.

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saiko21 said:

I am driving a 2019 Civic Si. I have a feeling that my car is not performing well. I drove 5000 mile on my current oil (Mobil 1 extended performance). I have a question about clutch. How can I test a clutch is slipping on a turbo charged car. I have experience with naturally aspirated engines where the RPM jumps if a clutch slips. I wanted to confirm if it's tires or clutch or just engine behavior
Thank you

Click to expand...

VooDuuChild said:

It should be pretty obvious if your clutch is slipping. The RPMs will increase and your speed will not, or will climb much slower compared to rpm. Get into 5th or 6th gear at about 1900 to 2000 rpm, then go wide open throttle...all the way to the floor. If your clutch is slipping, your rpms will rise quicker than your speed. You can try it at 3000 rpm too in 5th or 6th, but the car will probably just accelerate which is why I figure 2k rpm would exaggerate slippage.

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Crab said:

Can you run a datalog? If so, just do the math and see if wheel speed = calculated speed.

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ebatr24 said:

What does the car "not performing well" actually mean to you? Could just be that you've gotten use to how it drives so you no longer find it as quick. Hard to determine what is happening but if you don't already maybe you should try getting ktuner. Not only does it wake up the car and really make a huge difference, you have the benefit of being able to see when your car might be heatsoaked, when it is pulling timing, etc....

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