Diagnosing Clutch Slip - Mustang Evolution

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Old 08-07-2015, 08:56 PM   #1
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Diagnosing Clutch Slip

Team I learnt how to drive manual on my car ('14 Gt) after a couple hours of practice on my girls mini.

Can you give me some telltale signs of clutch slip and how to diagnose?

I did put it into 2nd and slowly let go of the clutch and it didn't seem to kill the engine (I went forward too). Etc

Any other smart ideas?


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Old 08-07-2015, 09:36 PM   #2
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Try putting the emergency brake on, put it in second and let out the clutch and give it a little gas. If the motor dies instantly go on to the next.
Take it on a road where the speed limit is 45mph or above. Go through the first 3 gears quickly and get up to 40mph.....then shift into 5th and give it gas. Does the motor lug, or does the rpm go up without moving forward as fast as normal.
How many miles does your car have on the odometer? As you let out the clutch to take off where is the clutch pedal in relation to the floor when the clutch engages?
Let us know.
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Old 08-07-2015, 09:37 PM   #3
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Your car has a lot of torque so you should try it in fourth gear. Rev the engine a little higher than you normally would, while slowly letting out the clutch.
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Old 08-07-2015, 09:38 PM   #4
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I'll do the things you said tonight/tomorrow.

Car is just 10,000km so ~7,000 miles.

Clutch engages around 70% up the way. So as I'm letting go 70% of the way to fully let go.


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Old 08-07-2015, 09:52 PM   #5
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Quote:
Originally Posted by Kustumb View Post
I'll do the things you said tonight/tomorrow.

Car is just 10,000km so ~7,000 miles.

Clutch engages around 70% up the way. So as I'm letting go 70% of the way to fully let go.


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If you mean 70% up from the floor I'd say you have an issue.
When was the last time you checked your brake fluid in the master cylinder or do you notice any leaks under the car.
I would assume your car is still under warranty.......right?
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Old 08-07-2015, 09:53 PM   #6
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Diagnosing Clutch Slip

Yeah I mean 70% up from the floor.

Last time the car got a full service done was around 5-6k km's.

What % from floor is clutch supposed to bite?

Yes car under warranty.

Thanks for the help btw.


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Old 08-07-2015, 09:56 PM   #7
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Your car has a lot of torque so you should try it in fourth gear. Rev the engine a little higher than you normally would, while slowly letting out the clutch.
I guess it's going to take time for me to call 390lbft of torque a lot. I'm used to a lot more from a SBF.
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Old 08-07-2015, 09:58 PM   #8
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My 14 TrakPak only has 8900 miles and when I let out the clutch it's only about 3" to 4" from the floor.
I should have asked you how many inches/cm from the floor before it engages, that is the way the Ford dealer would test it......or one of the ways.
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Old 08-07-2015, 10:13 PM   #9
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Diagnosing Clutch Slip

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Second picture is with the clutch fully pressed for reference.


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Old 08-07-2015, 10:16 PM   #10
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Attachment 188846Attachment 188847

Second picture is with the clutch fully pressed for reference.


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It's hard to say because it's so dark, but it kind of looks normal.........if the first picture is where the clutch is starting to grab.
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Old 08-07-2015, 10:26 PM   #11
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Yeah that's right. It's almost aligned with that dead pedal there. It clutch engages when the foot is around that high.

I'll do that on-road test when I'm out in an hour or so.


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Old 08-08-2015, 12:00 AM   #12
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Ok so.

Emergency break and 2nd gear. Slowly let out and revs dropped to 700 then climbed back to 1000 and then dropped again and killed it. By the time it killed the engine I was around 70% off the clutch (where the picture shows).

45 miles 5th gear. It didn't bog the engine down. It just very slowly gained speed in line with the revs. It didn't seem to slip there. I tried a bit of gas at one time and full wot at another, no change - slowly climbed.

Ideas?


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Old 08-08-2015, 02:06 PM   #13
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So why do you think your clutch is slipping?

All the indications point to a normal clutch.............if the Mustang and Cooper are the only sticks you've driven...............drive another 1000 miles in the Mustang and then make an evaluation just like you did yesterday/today.
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Old 08-08-2015, 02:16 PM   #14
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There doesn't seem to be anything wrong with your clutch.

Happy motoring Kustumb!
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Old 08-09-2015, 01:11 AM   #15
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Main reason was that I'd feel revs jump up at 1-2 when I'm wot and not feel the same "push" as before.

Might be something psychological though as I can't replicate it.

Thanks guys!

Omer


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