Ugh!!! My poor tj =( - JeepForum.com
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post #1 of 18 Old 08-19-2011, 06:23 PM Thread Starter
someschoolkid
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Ugh!!! My poor tj =(

Driving to a friends house, shift to 3rd going 35, press the gas, change lanes, the clutch slips and goes up about 200rpm (needs a new one)
Then the engine dies as if I just turned the key off. No amount of cranking would start it.

It has a half tank of gas and ALL other fluids are topped off. Has 45k miles

And a second rant to go with: For the 2 hours I was sitting on the side of i405, I saw MANY fellow wranglers go by, and none of them stopped to help . The only people who helped were some friendly russian folks in a ford f150. They lent me their phone and I was able to call a ride.

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post #2 of 18 Old 08-19-2011, 08:12 PM
JealousDad
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How did you burn up a clutch in 45000 miles?
And 35 mph in 2nd? Thats got to be almost 4000 rpms!
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post #3 of 18 Old 08-19-2011, 08:27 PM
ohtenwillys
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wrangler drivers weed out the weak
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post #4 of 18 Old 08-19-2011, 08:28 PM
Jtrux
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Whats the big deal with reving to 4k??


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post #5 of 18 Old 08-19-2011, 08:32 PM
JealousDad
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Nothing wrong with 4k rpms, unless your clutch is already going out
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post #6 of 18 Old 08-19-2011, 08:37 PM
B52dude
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Uh, dude. Your profile says you have a JK. Not a TJ.

Quote:
Originally Posted by Ripper3494 View Post
i think we should chase him around with yjs, its like being chased by zombies, slow, crippled but for some reason still scary as heck lol
Red Jeep Club #614
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post #7 of 18 Old 08-19-2011, 08:43 PM
Jtrux
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Some people have more than one jeep.


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post #8 of 18 Old 08-19-2011, 08:44 PM
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Quote:
Originally Posted by Jtrux View Post
Some people have more than one jeep.
Well, not anymore


I'm sorry, I couldn't resist. Sorry to hear about the TJ man, hope you get it worked out.


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post #9 of 18 Old 08-19-2011, 11:33 PM
joeyk803c
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Does it crank over? Just saying it doesn't start doesn't help. Tell us what it doesn't do in detail.
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post #10 of 18 Old 08-20-2011, 12:47 AM Thread Starter
someschoolkid
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I got it towed to a shop, who then told me that the crankshaft positioning sensor was bad. It would have been back of the road this evening, but a company shipped in the wrong part and it will be until Monday.

JealousDad: it was in 3rd with 32s and stock gearing. It was about 2.5k rpms. As for the clutch: higher rpms and not slipping seems better than low rpms and having the engine be required to push more torque - slipping the clutch. As for how it is going out so soon: no clue, I am the second owner. It was on its way out when I got it.

B52Dude: I do have more than 1 jeep. The jk is my daily driver since it has a better ride to it. The tj is my weekend warrior

Joey: thanks for the offer for help, I appreciate it. it cranks, but does nothing else. The shop found the problem though, so no big deal.
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post #11 of 18 Old 08-20-2011, 01:12 AM
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Quote:
Originally Posted by someschoolkid View Post
As for the clutch: higher rpms and not slipping seems better than low rpms and having the engine be required to push more torque - slipping the clutch.
Higher rpm applies more torque to the clutch as opposed to the lower rpm torque band...

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post #12 of 18 Old 08-20-2011, 10:20 PM Thread Starter
someschoolkid
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I respectfully disagree. Tell me if I go wrong in my reasoning.

Rpm and torque together form horsepower, but are in no way dependent on each other, so higher rpm wont apply any more torque than low rpm - ignoring any sort of torque curve. (big container ship engine might put out about 90k hp at 100 rpm making ~4.7 million ftlbs of torque. An F1 car on the other hand could make 740 hp at 19000 rpm making ~200 ftlbs of torque).

As a clutch wears and starts to slip, it does so because it is unable to hold the engine and transmission together with sufficient torque.

In it's most basic form (ignoring longevity, drivability, etc) horsepower is how fast a car goes, and how hard it accelerates.

Using T = Torque, H = Horsepower, R = RPM
H=T*R/5252
T=H*5252/R

If I need say... 50 bhp to accelerate at 1500rpm
T = 50hp * 5252 / 1500rpm
T = 175.1 ftlbs. Which would basically be nearly, if not floored (the engine is no longer in vacuum; the air pressure going into the cylinders is 1 bar).

If I downshift a couple gears and bring the rpms to 2750
T = 50hp * 5252 / 2750
T = 95.5ftlbs. Which would be a bit less than half of the engines maximum torque output.

This being said, if a clutch was to slip once 160 ftlbs of torque or more was applied to it, it should slip at 1500 rpm, not 2750 rpm as per the scenario above.

I have also observed that if I am going up a hill trying to maintain my speed, the clutch might slip in 3rd, but not in 2nd.
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post #13 of 18 Old 08-20-2011, 10:59 PM
alex211
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I shift at around 2500-3000 and end up around 1500-2000 in the next gear. I usually shift so it hits 1500 into the next gear because with the straight pipe it sounds cool.

95 xj bone stock for now
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post #14 of 18 Old 08-20-2011, 11:11 PM
wolfcreek
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Quote:
Originally Posted by someschoolkid View Post
I respectfully disagree. Tell me if I go wrong in my reasoning.

Rpm and torque together form horsepower, but are in no way dependent on each other, so higher rpm wont apply any more torque than low rpm - ignoring any sort of torque curve. (big container ship engine might put out about 90k hp at 100 rpm making ~4.7 million ftlbs of torque. An F1 car on the other hand could make 740 hp at 19000 rpm making ~200 ftlbs of torque).

As a clutch wears and starts to slip, it does so because it is unable to hold the engine and transmission together with sufficient torque.

In it's most basic form (ignoring longevity, drivability, etc) horsepower is how fast a car goes, and how hard it accelerates.

Using T = Torque, H = Horsepower, R = RPM
H=T*R/5252
T=H*5252/R

If I need say... 50 bhp to accelerate at 1500rpm
T = 50hp * 5252 / 1500rpm
T = 175.1 ftlbs. Which would basically be nearly, if not floored (the engine is no longer in vacuum; the air pressure going into the cylinders is 1 bar).

If I downshift a couple gears and bring the rpms to 2750
T = 50hp * 5252 / 2750
T = 95.5ftlbs. Which would be a bit less than half of the engines maximum torque output.

This being said, if a clutch was to slip once 160 ftlbs of torque or more was applied to it, it should slip at 1500 rpm, not 2750 rpm as per the scenario above.

I have also observed that if I am going up a hill trying to maintain my speed, the clutch might slip in 3rd, but not in 2nd.
Another Redmond nerd, eh? See you on the road
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post #15 of 18 Old 08-21-2011, 12:43 AM
dcope17
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I didn't read all the book but is the ending something like this?
His clutch went south and a piece of the clutch took out the crank position sensor?

Who cares when and howoften you shift and how much torque or anything. Drive like you want to drive...

.

Life with Christ can be explained like a Jeep...
Being in the Word... grows your tire size.
Prayer... gains more ground clearance.
Fellowship... Is like having a good spotter.

The more of these you have... the easier it is to get over obstacles in your path.
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