GalantVR4.org The Mitsubishi Galant VR-4 Forum
Galant VR-4 Forums » Galant VR-4 » Technical Discussions » ACT not keeping up
Previous thread Next thread

ACT not keeping up


4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825413 posted 08/31/09 01:35 PM     Remind Me!  Send Private Message   Edit Post      
Anyone else pushing high(er) HP numbers with a single disc clutch and having clutch issues?

My car dynod 557hp/455tq on a fresh (after properly broken in) ACT 2600/sprung 6 puck. This was maybe a thousand miles ago. It did ok, but when it was brought up to 9k RPMs, the clutch wouldnt disengage until the RPMs dropped below 7k. I never did cruise around with it cranked up this high. I had no intention on wringing out the motor to 9k on the street so I figured it should be fine for a while. Nope!

I was driving around the street with about 530whp and things have quickly been going down hill. My boost is now down to 25psi (from 31ish, well under the 500hp mark) and the clutch wont disengage with I bring it just past 7k RPM, it takes a while for it to pull out of gear after that. The clutch instantly goes soft at this point, too.

I knew I was taxing the clutch, but I really didnt think it would go downhill so quickly.

I really should start paying more attention to what Ive been told by respected members of the DSM/VR4 community...

The search for a twin disc begins.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (24.21.74.182) | Report this post to a Moderator

mac515
Unregistered


Galant VR-4 org Post #: 825420 posted 08/31/09 02:20 PM     Remind Me!  Send Private Message   Edit Post      
Can't really post on the clutch issue cas I have never had a 557WHP car with a clutch was on an auto . But man that much out of you GVR4 congrast

| | | IP: (204.136.26.41) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825428 posted 08/31/09 02:57 PM     Remind Me!  Send Private Message   Edit Post      
I wonder how the 2900/unsprung 6 puck would do. Just thinking out loud.

Thanks man, its a lot of fun. There is more to go, I just need a few more grand for L19s, Fel-Pro head gasket, 1650s, and the twin disc.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (24.21.74.182) | Report this post to a Moderator

belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 825434 posted 08/31/09 03:31 PM     Remind Me!  Send Private Message   Edit Post      
It may be that the clutch is only part of the problem. What kind of transmission do you have that you expect it to shift at 9k?



Roger B. Scott
'91 Belize Green

Posts: 3313 | From: Dundee, Scotland, UK | Member Since: 11/18/03 | IP: (153.90.194.247) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825454 posted 08/31/09 04:43 PM     Remind Me!  Send Private Message   Edit Post      
The tranny is a fresh full rebuild by English racing, double cone 2nd, 3rd, and 4th.

On the dyno, he was bringing it to 9k for tuning purposes. On the street, its seen 9k maybe 3 times, but I have no reason to bring it that far. The car doesnt start dropping power until just after 8000rpm.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (71.214.93.138) | Report this post to a Moderator

turbowop
Hard Snarker
1051/2000



Galant VR-4 org Post #: 825522 posted 08/31/09 07:59 PM     Remind Me!  Send Private Message   Edit Post      
Quoting 4thStroke:



The search for a twin disc begins.




Are all the vendors out of stock or something? Hurry up and buy!!

Or are you trying to find a used one?



-Mark

A face only a grocery shopper could love.
1051

Posts: 11965 | From: Yakima, WA | Member Since: 04/29/01 | IP: (97.90.49.2) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825523 posted 08/31/09 08:00 PM     Remind Me!  Send Private Message   Edit Post      
Waiting for a good deal to pop up, used (would have to be in good shape), or not. I will probably just end up buying from Lucas.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (71.214.93.138) | Report this post to a Moderator

BOOSTIN HARD
Unregistered


Galant VR-4 org Post #: 825525 posted 08/31/09 08:04 PM     Remind Me!  Send Private Message   Edit Post      
Why do you need L-19's???

| | | IP: (75.204.2.243) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825536 posted 08/31/09 08:22 PM     Remind Me!  Send Private Message   Edit Post      
Added security when running 32+ psi. I dont want the head to be lifting on me, especially since its my daily driver. We even held off on timing down low to help keep the head down.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (71.214.93.138) | Report this post to a Moderator

Brianawd
Higher Launch RPM
439/1000


Galant VR-4 org Post #: 825541 posted 08/31/09 08:43 PM     Remind Me!  Send Private Message   Edit Post      
Quote:

Why do you need L-19's???




Because the regular 8740 head studs suck ass. I know I know, People have made 700+ with them but that is short lived. Why not just put them in with a good head gasket and forget about it.

On my 95/90 motor I was lifting the head with the 8740 studs. So I replaced the head gasket with a fel-pro mls had the head surfaced and then check and hand lapped the block. I again used 8740 studs. Motor was good for a few more months then started lifting the head again. It was after that I choose to never use the 8740 studs. Why spend $85 for a set of throw away studs when you can spend a little more and get something that you can use over and over and don't have to think about. Thats just me.



1992 Gaylant vr4 #439/1000
11.1at131 562awhp/484awtq
E85 FP3052 parted out
05 EB EVO SSL 11.48at124mph
450awhp/400awtq New 2.3 e85 hks 7460r
05 JEEP liberty CRD DD/ski slut
200hp/385tq


Posts: 2117 | From: Portland OR, | Member Since: 04/18/05 | IP: (166.187.81.20) | Report this post to a Moderator

BOOSTIN HARD
Unregistered


Galant VR-4 org Post #: 825821 posted 09/01/09 06:22 PM     Remind Me!  Send Private Message   Edit Post      
To tell you the truth, I have been running the standard stud forever and have never had a problem(35psi) but it may be the way we o-ring the block. Mike Reichen still runs the standard head studs with 45+psi. We were having an issue but we ended up milling the head out and welding it up solid under the exhaust port were it was blowing out and we haven't had any issues since. I've also done an evo 8 head like that also.



| | | IP: (70.195.158.0) | Report this post to a Moderator

Brianawd
Higher Launch RPM
439/1000


Galant VR-4 org Post #: 825839 posted 09/01/09 07:16 PM     Remind Me!  Send Private Message   Edit Post      
Quote:

To tell you the truth, I have been running the standard stud forever and have never had a problem(35psi) but it may be the way we o-ring the block. Mike Reichen still runs the standard head studs with 45+psi. We were having an issue but we ended up milling the head out and welding it up solid under the exhaust port were it was blowing out and we haven't had any issues since. I've also done an evo 8 head like that also.




No o-rings here. I thought about doing on this build but for some reason did not. Maybe next time.



1992 Gaylant vr4 #439/1000
11.1at131 562awhp/484awtq
E85 FP3052 parted out
05 EB EVO SSL 11.48at124mph
450awhp/400awtq New 2.3 e85 hks 7460r
05 JEEP liberty CRD DD/ski slut
200hp/385tq


Posts: 2117 | From: Portland OR, | Member Since: 04/18/05 | IP: (166.129.62.47) | Report this post to a Moderator

BOOSTIN HARD
Unregistered


Galant VR-4 org Post #: 825841 posted 09/01/09 07:20 PM     Remind Me!  Send Private Message   Edit Post      
We press the o-rings into the block and then mill the tops off so they stick up about .005. It seems to work the best and then copper coat everything real good.

| | | IP: (70.195.158.0) | Report this post to a Moderator

chvtec33
Junior Member


Galant VR-4 org Post #: 825889 posted 09/01/09 10:05 PM     Remind Me!  Send Private Message   Edit Post      
I have seen clutches not hold up well before from spinning so fast that centrifugal force on the clutch is so great that the pressure plate wont release completely. Ive seen it on our dyno when the clutch was under rated for the power of the engine, but that was on a drag race engine pushing 950hp and spinning 9k or so. Just a thought.

Posts: 29 | From: Tolland, Ct | Member Since: 05/21/09 | IP: (71.235.146.229) | Report this post to a Moderator

iLLeffeKt vr-4
Hertz pulverized mine
1759/2000


Galant VR-4 org Post #: 825894 posted 09/01/09 10:11 PM     Remind Me!  Send Private Message   Edit Post      
How much torque is your clutch setup rated for?



Adrian
1759/2000 Summit White Sold
1991 Eclipse GS-X Sold
2013 EVO X MR - Daily

Posts: 2153 | From: NYC | Member Since: 07/26/04 | IP: (208.54.87.54) | Report this post to a Moderator

1badgvr4
not even the right model
1299/2000


Galant VR-4 org Post #: 825901 posted 09/01/09 10:38 PM     Remind Me!  Send Private Message   Edit Post      
What setup are you running. I don't know if it just me, but my twin disc is VERY harsh. On decel it feels as if im breaking something. I love the way it sounds tho

Posts: 1242 | From: georgia | Member Since: 07/02/06 | IP: (76.4.129.157) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825911 posted 09/01/09 11:39 PM     Remind Me!  Send Private Message   Edit Post      
The 2600/6 puck setups are rated at 513ftlbs per ACT. So I must be really pushing that number, but I would think that it would do a little better. I am under 450ftlbs at the wheels.

Setup as far as what? Power mods? Drivetrain mods?

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (67.42.152.234) | Report this post to a Moderator

1badgvr4
not even the right model
1299/2000


Galant VR-4 org Post #: 825912 posted 09/01/09 11:45 PM     Remind Me!  Send Private Message   Edit Post      
I was asking about power. I had a 2900 6 puck with LW Flywheel and it was great. If my trans ever comes back out ill put that setup back in it.

Posts: 1242 | From: georgia | Member Since: 07/02/06 | IP: (76.4.129.157) | Report this post to a Moderator

turbowop
Hard Snarker
1051/2000



Galant VR-4 org Post #: 825913 posted 09/01/09 11:59 PM     Remind Me!  Send Private Message   Edit Post      
Power output is mentioned in the first post of this thread.



-Mark

A face only a grocery shopper could love.
1051

Posts: 11965 | From: Yakima, WA | Member Since: 04/29/01 | IP: (97.90.49.2) | Report this post to a Moderator

Brianawd
Higher Launch RPM
439/1000


Galant VR-4 org Post #: 825918 posted 09/02/09 12:15 AM     Remind Me!  Send Private Message   Edit Post      
Go twin or go home



1992 Gaylant vr4 #439/1000
11.1at131 562awhp/484awtq
E85 FP3052 parted out
05 EB EVO SSL 11.48at124mph
450awhp/400awtq New 2.3 e85 hks 7460r
05 JEEP liberty CRD DD/ski slut
200hp/385tq


Posts: 2117 | From: Portland OR, | Member Since: 04/18/05 | IP: (32.177.204.37) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 825930 posted 09/02/09 02:51 AM     Remind Me!  Send Private Message   Edit Post      
Im working on it.

Brian... this is all your fault.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (71.214.93.138) | Report this post to a Moderator

curtis Galant VR4.org Moderator
Space Blanket from NASA plumbed into the attic
475/1000


Galant VR-4 org Post #: 825933 posted 09/02/09 03:08 AM     Remind Me!  Send Private Message   Edit Post      
Quoting Brianawd:

Go twin or go home





I agree with Brian....I'll never have a stick car again without one.

Someone has one for sale in the for sale pages. Its new and has a new price but you want new, wheather your wallet says so or not. The pp can cup and other things as well just better off getting a new one and not worry. Before I bought my PTT Chris mailed me his just to look at and inspect to prove a point. I ordered one the same day. There worth every penny.

Steve at PTT designed the QM unit and has made upgrades since he started his own business. Get a PTT and never look back except to see where the tires are dusting in every gear.



92 GVR4 0475/1000
Greenhouse Effect Green
Exceeds Mechanical Limits
"Put the dawg to work.
Ass, Gas or Milkbones. Nobody rides for free" Jon AKA Toybreaker

Posts: 11892 | From: Clarksville TN | Member Since: 05/04/03 | IP: (208.95.177.60) | Report this post to a Moderator

1badgvr4
not even the right model
1299/2000


Galant VR-4 org Post #: 825937 posted 09/02/09 05:36 AM     Remind Me!  Send Private Message   Edit Post      
Quoting turbowop:

Power output is mentioned in the first post of this thread.


Power mods not power output.

Posts: 1242 | From: georgia | Member Since: 07/02/06 | IP: (76.4.129.157) | Report this post to a Moderator

4thStroke
Spence knows tools
786/2000


Galant VR-4 org Post #: 826044 posted 09/02/09 12:42 PM     Remind Me!  Send Private Message   Edit Post      
I have the FP DSM76 (GT3076R HTA), Comp 272s, full 3" exhaust, forged 9:1 motor, built and ported head, E85, and the rest of the supporting mods.

There is more left in this setup, I just need to take care of fuel delivery and the stuff mentioned before and we'll be set for a while.

Posts: 1864 | From: Vancouver, WA | Member Since: 10/22/07 | IP: (24.21.74.182) | Report this post to a Moderator

vr4underboost
Unregistered


Galant VR-4 org Post #: 826069 posted 09/02/09 02:06 PM     Remind Me!  Send Private Message   Edit Post   
Quoting 4thStroke:

The 2600/6 puck setups are rated at 513ftlbs per ACT. So I must be really pushing that number, but I would think that it would do a little better. I am under 450ftlbs at the wheels.






Just for the sake of clarification that rating of 513 ft. lbs. is at the flywheel not the wheels. Using a 15% correction factor for drivetrain loss that puts the capacity at 436 ft. lbs. at the wheels.

Daryl

| | | IP: (216.73.210.203) | Report this post to a Moderator


Pages: 1 | 2
Previous thread Next thread

Extra information
0 registered and 24 anonymous users are browsing this forum.

Galant VR4.org Moderator:  curtis, steve, atc250r, jcgalntvr4-244, cheekychimp, jepherz, Rausch, toybreaker, iceman69510, pot, FlyingEagle 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Thread views: 2612

Rate this thread


News & Events: News | Events
Galant VR-4: Newbies | General VR4 Discussions | Technical Discussions | How To and Info Archive
Marketplace: Parts For Sale | Cars For Sale | Good Guys | Bad Guys
Community: Members' Showcase

Contact Us | Privacy statement GalantVR-4.org

Generated in 0.151 seconds in which 0.088 seconds were spent on a total of 14 queries. Turbo powered.


Hertz's Galant VR-4 Page