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Old 11-16-2020, 01:23 AM   #1
jeff6666p
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Member#: 400078
Join Date: Aug 2014
Chapter/Region: South East
Location: hampstead/nc
Vehicle:
1998 2.5rs06wrx swap
black

Default Clutch issues

For the last two months I've had issues with shifting. I was getting some lock out in gears at wot, Sometimes in the morning the clutch pedal would stick. Now I'm noticing the first couple of shifts in the morning are very rough no matter how easy I try to be on it. When I. get on it in 1st and 2nd I get some jerking/bounce(not shifting) and now it's hard to shift in all gears at wot. Shifts fine at 50-70%.

I also felt like the car feels slower in higher gears lately and some times when I get on it in 4th at 3.5-4k the car revs up and goes but then 2 seconds later the car jerks acceleration is almost doubles. I believe my clutch my be slipping at heavy loads and cold starts. Can anyone back me up on this?

98 rs
06 wrx engine running stock turbo 13.5-15.5 psi
06 wrx clutch(unknown miles and brand) rs 5 speed.

gear oil is 4 years old only has about 5k-7k on it I believe it's pennzoil.
Clutch fluid was last flushed 2 years ago.
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Old 11-16-2020, 11:47 AM   #2
Samurai Jack
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Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
Vehicle:
2002 Enemy of Aku

Default

Quote:
Originally Posted by jeff6666p View Post
I also felt like the car feels slower in higher gears lately and some times when I get on it in 4th at 3.5-4k the car revs up and goes but then 2 seconds later the car jerks acceleration is almost doubles. I believe my clutch my be slipping at heavy loads and cold starts. Can anyone back me up on this?
This sounds / acts like your clutch is slipping.

Not sure about the other issues you mentioned but it's very possible that all issues are clutch related.
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Old 11-19-2020, 10:00 PM   #3
jeff6666p
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Join Date: Aug 2014
Chapter/Region: South East
Location: hampstead/nc
Vehicle:
1998 2.5rs06wrx swap
black

Default

Quote:
Originally Posted by Samurai Jack View Post
This sounds / acts like your clutch is slipping.

Not sure about the other issues you mentioned but it's very possible that all issues are clutch related.
Would a southband stage 3 be good for vf48? They seem to get around 330-370 ftlb at the wheels. Southbend says the daily is good for 400 for the daily but doesn't say if at the crank or wheels. or should I get the endurance one instead rated at 450.
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Old 11-20-2020, 12:14 AM   #4
AliBenn
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Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

Default

Hmmmmm
2 things

1-after an autoX in summer I discovered that pedal would stick, difficult to shift bc of the heat. After 20min on hwy, normal operation returned
I replaced clutch master cylinder and scavenged a heat wrap from some Audi S4 and buttoned it around my clutch MC
No issues and that was 13yrs ago

2-if you are cruising in 5th gear.....lets say 2800RPM......stomp on the gas.....if your engine revs like your in neutral, you need a clutch assembly
Disk/plate/throw out bearing/pilot bearing
Resurface the flywheel too($40-$60 at a machine shop)
GL
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Old 11-20-2020, 10:55 AM   #5
Samurai Jack
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2002 Enemy of Aku

Default

Quote:
Originally Posted by jeff6666p View Post
Would a southband stage 3 be good for vf48? They seem to get around 330-370 ftlb at the wheels. Southbend says the daily is good for 400 for the daily but doesn't say if at the crank or wheels. or should I get the endurance one instead rated at 450.
Clutches are rated in TQ at the crank, not the wheels. You have to figure out how much TQ you are making.

I take TQ at the wheels
Add 20% to get TQ at the crank
Add 20% for a buffer

I take that final TQ number and use that to search for an appropriate clutch.

Never used SouthBend
I had an ACT and it worked very well.
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Old 11-20-2020, 11:52 AM   #6
Zak6182
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Member#: 481754
Join Date: Feb 2018
Location: Beaufort, SC
Vehicle:
2017 STi Base
Black

Default

^ what Samurai said.

I can say I do love my SB clutch. I have a STi so its a little different but I'm running a SB stage 2 endurance (rated at 565 ft lbs) and love it. If you drove it you wouldn't know is not the stock clutch. Its quiet, feels factory and had absolutely no issues during break in.

Just got an email from MAPerformance***8230; 30% off ACT clutches

Last edited by Zak6182; 11-20-2020 at 12:07 PM.
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Old 11-20-2020, 12:59 PM   #7
bp05obxt
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Join Date: Dec 2016
Default Clutch issues

Broken clutch fork

Damaged snout and throwout bearing
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Old 11-20-2020, 01:12 PM   #8
noktrnal1
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Member#: 90957
Join Date: Jul 2005
Chapter/Region: SCIC
Location: CA
Vehicle:
2016 WRX
Crystal White Pearl

Default

South Bend Clutch is on point. I have the Daily Stage 3 in and it grips like crazy. Unless you're pushing close to that power that is stated (400) which is rated at the crank, I would go with a Daily Stg2. The guys at SB said they rate their clutches conservatively so it can probably handle a little more than whats printed.

The rev's going up and it not moving is most likely the clutch slipping. My stock clutch did that in all gears after I got a Stg2 tune. I would get on it a little and the rev's would jump but it wouldn't move any faster. Doing that enough times will cook your flywheel up too. I eneded up needing a new one when I had a shop replace the clutch.
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Old 11-20-2020, 01:15 PM   #9
benflynn
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Default

Is HP not tq expressed in a different form
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