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Old 03-10-2015, 11:52 PM   #1
Bugeyeblake
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Default brand new clutch-slipping-help please! 02 wrx

alright guys so I'll start off with the basics about my car
it's an 02 wrx, 147k miles on chassis
I just rebuilt the ej205 3.5k miles ago
full on rebuild new everything exept crank and rods but still oem except for acl race bearings. while the engine was out I had the flywheel resurfaced, it's a lightened flywheel, I don't know the brand or weight (I probably should of weighed it lol) and as the rebuild went on I started getting low on funds
I had a friend who works at a local shop give me a clutch masters stage 2 pressure plate with I believe 5k miles on (it looked brand new) and I purchased an exedy stage 1 clutch disc, non pucked
the car is fully bolted on with a vf48 at 19psi

so I broke in the clutch how I have before with no problems, I took it very easy on the clutch for the first 1k miles, I never launched it or slammed gears or anything, minimal slippage when taking off from a stop

I personally did not notice any slipping but my tuner noticed in my data logs the rpm kind off stalls during a wot pull

the log will show something like this

5230 rpm
5230 rpm
5261 rpm
5311 rpm
5328 rpm
5336 rpm
5336 rpm
5336 rpm
and so on
so basically it goes up some than doesn't change for 2 or 3 cells

I hope that makes sense

I have tried to re-break-in the clutch by basically treating it as an on/off switch and it didn't help anything

any help is appreciated!!
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Old 03-11-2015, 06:57 AM   #2
Max Capacity
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Contact CM and see how thick the clutch was when it was new. Measure it when you get it out.

I just had a Spec 2+ clutch installed in my wagon. 280whp/300ftlbs, I have about 500 miles on it. It has a very light pedal much nicer then the same clutch I had a few years back. I also had OEM SMFW installed at the same time.

The car had a Spec LWFW with a 2+ from 72,000 miles till 154,000 miles. At that time I put Spec 2 clutch in with new friction surface. That lasted 50,000 miles. Now at 203,000 miles.



I'm guessing your CM was more then used...
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Old 03-11-2015, 02:56 PM   #3
Bugeyeblake
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yea ill do that I guess, I really doubt my good friend would screw me over like that though
I could tell the pressure plate was in like new condition
it still had the machining marks and the paint and sticker were brand still shiny lol
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Old 03-11-2015, 03:38 PM   #4
GDR
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So if its slipping wouldn't the rpm's jump up?
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Old 03-11-2015, 04:32 PM   #5
Chapman
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Drive it til you notice it slipping in real life driving.

Is this tuner somebody who knows Subaru?
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Old 03-11-2015, 04:55 PM   #6
anjuna
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something that fine could be drivetrain movement.
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Old 03-11-2015, 09:21 PM   #7
Bugeyeblake
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Default brand new clutch-slipping-help please! 02 wrx

well ya that's the thing is like physically I notice absolutely no slipping, but he is saying that he can't really dial in the tune because when it slips it starts knocking a little
I'm no tuner obviously so I'm not really sure if that is a true thing
and yes he is mainly a subaru tuner
it's an e-tune though so he is just tuning through logs
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Old 03-12-2015, 11:20 AM   #8
Wrxtuner251
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Not trying to be a dick, but if it looks shiny and new that just means someone has cleaned it, a used pressure plate should have some signs of dirt or particulate. You need to drop the tranny, pull the clutch from the flywheel and make sure he didn't install the friction disc backwards this can cause slippage. Also check to see that there isn't any grease or oils on the friction disc this can cause slippage.

Heres a site: that can help diagnose clutch problems

http://tegger.com/hondafaq/clutch/index.html

Good luck

Last edited by Wrxtuner251; 03-12-2015 at 11:35 AM. Reason: Fixing my mistakes
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Old 03-12-2015, 03:29 PM   #9
02WRX2.5
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Check your clutch slave!
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Old 03-12-2015, 03:33 PM   #10
anjuna
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Quote:
Originally Posted by Bugeyeblake View Post
well ya that's the thing is like physically I notice absolutely no slipping, but he is saying that he can't really dial in the tune because when it slips it starts knocking a little
I'm no tuner obviously so I'm not really sure if that is a true thing
and yes he is mainly a subaru tuner
it's an e-tune though so he is just tuning through logs
let me guess. bren?
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Old 03-12-2015, 03:51 PM   #11
Bugeyeblake
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I'm on my phone so I'm not sure how to quote but,

wrxtuner251 :all work was done by me so I'm fairly certain it was installed properly
I brake cleaned all mating surfaces before bolting it all up
and when I said it looked new j didn't really mean like out of the box new
it has been used but I trust my friend and his shop did not pull one over on me
thanks for the link though I will check it out forsure
and thankyou

02wrx2.5 :slave was replaced about 10k ago and when rebuild was done a braided line was also installed

anjuna : what does bren mean lol

if I can't get it to stop slipping I'll be pulling the motor to inspect further
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Old 03-13-2015, 02:10 AM   #12
Bugeyeblake
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any one else?
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Old 03-13-2015, 02:33 AM   #13
ltownsgrimreaper
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I'd try starting out in first or at 20 mph and then put it in 5th a see if the clutch starts slipping or if it holds that's what I have done in the past. My buddy had a issue with there clutch not holding power on his z.
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Old 03-13-2015, 03:44 PM   #14
Bugeyeblake
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I have never put it in 5th at that low of a speed but it does hold at high load
like 5th gear at 2k rpm wot
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Old 03-14-2015, 11:05 AM   #15
LyveWRX
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Quote:
Originally Posted by Bugeyeblake View Post
I have never put it in 5th at that low of a speed but it does hold at high load
like 5th gear at 2k rpm wot
how about 3500rpm WOT? does 5th still hold?
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Old 03-14-2015, 12:53 PM   #16
Bugeyeblake
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yes sir
every hear every rpm holds
that's what's weird
the only reason he thinks it's slipping is by looking at the loga
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Old 03-14-2015, 06:05 PM   #17
Chapman
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Just drive it...
What do you have to lose? A screwed up clutch?

If it starts slipping in real life, get new parts next time.
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Old 03-15-2015, 04:29 AM   #18
Bugeyeblake
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lol, the problem is we can't dial in the tune. so no, I'm not worried about ****ing up the clutch I'm worried about blowing my motor
no need to get sassy
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Old 03-19-2015, 10:52 PM   #19
Bugeyeblake
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anyone else have any ideas?
maybe a technique to "re-break in" the clutch?
or am I **** out of luck
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Old 03-20-2015, 12:57 AM   #20
LyveWRX
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I dont think the clutch is slipping....

Where is the RPM log coming from? The ECU?
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Old 03-20-2015, 11:34 AM   #21
Wrxtuner251
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Quote:
Originally Posted by Bugeyeblake View Post
anyone else have any ideas?
maybe a technique to "re-break in" the clutch?
or am I **** out of luck
Honestly blake, with out pulling the clutch to see if it shows signs slipping you will never truly know."even if it doesn't act like it" But, keep in mind you could just have a slow crankshaft sensor. The RPM delay in the log shouldn't be cause for an alarm. Explain to your E-tuner that you are aware of his input but you wish to continue tuning if he refuses find a new E-tuner.

You could try replacing or cleaning the sensor to see if it helps
--
Take a look at this, it explains how your crankshaft sensor works.

Last edited by Wrxtuner251; 03-20-2015 at 04:57 PM. Reason: New info
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Old 03-20-2015, 12:08 PM   #22
Bugeyeblake
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okay! thankyou! finally a real answer
I think I'll go ahead and swap sensors with a friend and see if that helps
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