Thread: Clutch getting stuck at high RPM shifts.

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2011-11-05 23:52:59

#11

92SentraSE-R Online/offline status of 92SentraSE-R is unknown

b14+p11=<3

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How many inches is that spring, rough estimate? I want to do this on my b14

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2011-11-05 23:54:14

#12

D-Unit121

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Originally Posted by Scrildo

True very true but I needed a quick fix before I went to the track and it worked so well I got lazy and never looked back lol. Also it had a fresh clutch cable and I was running an ACT clutch and pressure plate combo.

good shit man...thx for the pics

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2011-11-05 23:58:45

#13

Scrildo

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Originally Posted by 92SentraSE-R

How many inches is that spring, rough estimate? I want to do this on my b14

If you want I can run into autozone and pull a part number for you its in the help aisle though man you can't miss it

Originally Posted by D-Unit121

good shit man...thx for the pics

LOL no problem man it works awesome trust me. I dont know what causes the tranny to do this but trust me after I did this it was a night and day difference it works awesome lol.

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Once you go turbo you'll never go back!!!

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2011-11-06 00:07:15

#14

92SentraSE-R Online/offline status of 92SentraSE-R is unknown

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Originally Posted by Scrildo

If you want I can run into autozone and pull a part number for you its in the help aisle though man you can't miss it

LOL no problem man it works awesome trust me. I dont know what causes the tranny to do this but trust me after I did this it was a night and day difference it works awesome lol.

thanks, I'll just go today and look at whats similar

Thanks!

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2011-11-06 00:09:36

#15

Scrildo

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Originally Posted by 92SentraSE-R

thanks, I'll just go today and look at whats similar Thanks!

no problem dude

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2011-11-06 01:52:10

#16

Will

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Originally Posted by 92SentraSE-R

It is possible that when the engine speed is greater than 6000 RPM and the clutch pedal is depressed, centrifugal loads on the clutch diaphragm spring may be greater than the clutch return load from the diaphragm spring. This force created by RPM would be directionally opposite to the clutch bearing force, causing a near net zero or less than zero return force. As a consequence, the clutch pedal may be stuck at the bottom of travel at the floor. Once the engine speed reduces to less than 6000 RPM, spring return load dominates and the clutch pedal returns to normal function

This seems like the answer to WHAT the problem is, but now the question is WHY is this happening?

I can see only 2 possibilities:

1) This seems unlikely since it is happening with different clutches, but there could be something wrong with the design or manufacturing of the pressure plate.

2) Too large of a step machined into the flywheel which means the pressure plate has to be pushed further than it should to disengage the disk. I am more than willing to be that this is the issue.

The factory spec step in a stock sr20 flywheel is very small. From this picture I found of an F1-Racing flywheel on google, the step looks WAY too large:

You guys need to either ditch that flywheel or get it machined down closer to factory specs.

You could also probably fix the issue by making a spacer out of aluminum sheet to fit between the pressure plate the the mounting surface of the flywheel. This may be the best option since the spacer could be swapped for a thinner one or removed completely as the friction surface of the flywheel wears down, adding to the life of the flywheel.

Last edited by Will on 2011-11-06 at 01-55-53.

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White '92 NX2000 - JWT PP & B15 Disk, Hypercoil Gen2 damped by Koni Yellow Sports NX Thread

Black '95 200sx SE-R T28 Turbo Lowport 286whp/245wtq 12.306 @ 113.55 200sx Thread

Originally Posted by wnwright
I'm sorry I'm an engineer. I'm looking at the math.

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2011-11-06 02:00:17

#17

D-Unit121

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this looks like the one i installed in my car

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2011-11-06 02:07:44

#18

Will

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Hmmmm, that step does look smaller than the one I found. The problem has to be with the flywheel though, it's the only commonality. I wonder if the quality control is off and these flywheels have varying step sizes. The only way to know for sure that this is the problem is to take off the tranny/pp and measure the step.

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White '92 NX2000 - JWT PP & B15 Disk, Hypercoil Gen2 damped by Koni Yellow Sports NX Thread

Black '95 200sx SE-R T28 Turbo Lowport 286whp/245wtq 12.306 @ 113.55 200sx Thread

Originally Posted by wnwright
I'm sorry I'm an engineer. I'm looking at the math.

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2011-11-06 02:13:09

#19

Will

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The step looks pretty big in this one I found in a thread on this forum:

http://www.sr20-forum.com/southwest/12381-9lbs-flywheel-clutch-sr20.html

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White '92 NX2000 - JWT PP & B15 Disk, Hypercoil Gen2 damped by Koni Yellow Sports NX Thread

Black '95 200sx SE-R T28 Turbo Lowport 286whp/245wtq 12.306 @ 113.55 200sx Thread

Originally Posted by wnwright
I'm sorry I'm an engineer. I'm looking at the math.

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2011-11-06 02:16:46

#20

Will

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I found a thread of a guy building a KA24 on another forum, he has resurfaced his flywheel to what looks very similar to the stock sr20 specs:

1995 wannabe kouki S14 Ka-t N. Doces' Build thread

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White '92 NX2000 - JWT PP & B15 Disk, Hypercoil Gen2 damped by Koni Yellow Sports NX Thread

Black '95 200sx SE-R T28 Turbo Lowport 286whp/245wtq 12.306 @ 113.55 200sx Thread

Originally Posted by wnwright
I'm sorry I'm an engineer. I'm looking at the math.

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