bob92vr4
(Member +)
01/11/10 05:18 PM
QM twin disc questions

Ok so I bought a used QM twin disc and Im getting ready to install this thing and just curious if anyone with experience with these can tell me if i should install the isuzu slave and a pedal stop. I have search this subject and cant find any info on it also if anyone know's where to find dsm/gvr4 specific install info I.E how much material and where it needs to be removed from the stock clutch fork that would be great too thanks.

4thStroke
(Spence knows tools)
01/11/10 07:26 PM
Re: QM twin disc questions

If I recall correctly, the Isuzu lave and clutch stop are needed for the PTT twin, not the QM.

The 2g accumulator and slave can be used to help out the driveability, and help a ton. As far as trimming the fork, Im not sure how much needs to be trimmed, you may just need to test it out and see.


brisvr4
(Oceania Distict Enforcer for the Galant VR4 Mafia)
01/11/10 10:20 PM
Re: QM twin disc questions

I used the stock slave and no pedal stop with mine.
I set the clutch up on a bench and assembled the fork and throwout bearing then laid the fork on the clutch housing to see where the bolts would hit and ground away that area only.
Took a decent amount of time till I could rotate the fork all the way round the clutch housing without it hitting any of the bolts.
That seemed to be the easiest way to do it without having the motor out so you could test fit everything easily.
I was a bit paranoid about it hitting though!


**DONOTDELETE**
(Unregistered)
01/11/10 10:36 PM
Re: QM twin disc questions

Here are some pics of the fork.









curtis
(Space Blanket from NASA plumbed into the attic)
01/11/10 10:56 PM
Re: QM twin disc questions

Ok since this is used you need to check it first. It may be fine but you don't want to install it and a month later smoke two disks that are about 220 to replace plus the time and effort to pull it again.

first you need a slab of marble or something known to be dead flat. Thick mirror etc. Set the flywheel face down and measure the inside of the friction area and do the outside with a feller gauge do the same to the pressure plate disk friction surface. I can't remember the specs on it but I'm sure a quick call to QM or PTT will get the specs they cup from heat. Its steel under tremendous load and heat and will cup do all the way around it. Now for the disks measure the thickness all around and get an average thickness also get the specs for it. The disks are only allowed like .008 total loss or something like that so It might look perfect and plenty of material left but may be junk. When my thrust went out I was about 70 miles from home and kept trying to adjust the clutch and nothing help so I limped it home. I had worn off like .070 total on both disks and Steve (I think that's his name) at PTT couldn't believe I got home.

As for the isuzu slave. I used it on mine and didn't build a stop because I never slab it to the floor and never over extend it anyway so just a waste for me but a stop would be easy enough to build. I found my slave out in the shop other day and some how one of the new bolt holes I drilled broke off so I'll have to get another or just have a stock one bored out and the piston from the izuzu installed in it. Alot has to be cut off the ears for the mitsubishi bolt holes to line up but a hack saw and a drill will only take a few minutes. Measure and mark 4 times cut once.


turbowop
(Hard Snarker)
01/12/10 12:48 AM
Re: QM twin disc questions

I bought my setup used from a buddy that put maybe 700 miles on it and installed it using the stock slave cylinder and put a bolt in the lower clutch switch location to create a pedal stop. Mine came with a clutch fork that was already clearanced. Works fine, but the clutch is very on/off. I recently purchased a 2gDSM AWD slave and accumulator that I will be installing with a new transmission this spring. I will also be removing the pedal stop. BrianAWD has had good luck using this combo on his setup.

4thStroke
(Spence knows tools)
01/12/10 01:16 AM
Re: QM twin disc questions

I drove Brians car when he had just the accumulator installed. It was very, very manageable, not much more aggressive than my 2600/6 puck setup.

When my QM goes in, Im going to strictly swap the clutches, then later add the accumulator and 2g slave just to see how each piece affects the clutch on my setup.


cobrajetguy
(Doppleganger)
01/12/10 10:26 PM
Re: QM twin disc questions

I have a PTT in my GVR4, I used a bolt in the stock clutch switch location to make a pedal stop and I couldn't ever get the isuzu slave to bleed perfect so I put a stock slave back on it and it was fine. I didn't clearance the clutch fork but it will definitely hit if the stop is not set perfect which makes it pretty close to the floor on engagement. I already chewed through a set of metallic discs street driving the car and am trying a set of organics next and will clearance the fork while it's apart.

Peter


bob92vr4
(Member +)
01/12/10 11:00 PM
Re: QM twin disc questions

good info thanks guys. Any advice on where to pick up the 2g parts jnz or dealer?

curtis
(Space Blanket from NASA plumbed into the attic)
01/12/10 11:11 PM
Re: QM twin disc questions

So whats the bore dia. on the 2nd gen slave and also whats the dia of the master on a second gen. I have one of there masters in the shop somewhere to go on mine because it comes with a remote mount fluid tank. If no one knows right off hand I'll dig it out and measure.

4thStroke
(Spence knows tools)
01/12/10 11:13 PM
Re: QM twin disc questions

Id just go through JNZ. They wont jerk you around like a dealer may.

1941Galant
(Will fight mice for food)
01/13/10 09:27 AM
Re: QM twin disc questions

Quoting cobrajetguy:

I have a PTT in my GVR4, I used a bolt in the stock clutch switch location to make a pedal stop and I couldn't ever get the isuzu slave to bleed perfect so I put a stock slave back on it and it was fine. I didn't clearance the clutch fork but it will definitely hit if the stop is not set perfect which makes it pretty close to the floor on engagement. I already chewed through a set of metallic discs street driving the car and am trying a set of organics next and will clearance the fork while it's apart.

Peter




You don't have to clearance the fork when using the PTT twin disk. I don't use the clutch stop with my twin disk, I make sure the clutch disengages just before the clutch pedal hits the floor, and I test it every time I fire the car up. I also use the 2g fwd slave w/ the clutch line accumulator.


bob92vr4
(Member +)
01/13/10 06:57 PM
Re: QM twin disc questions

ok so i went to jnz they dont have a accumulator listed does anybody have the part #'s? and are both the slave and accumulator from the fwd and not awd?

1941Galant
(Will fight mice for food)
01/13/10 07:44 PM
Re: QM twin disc questions

Here are the part #'s that were posted in another thread, they were apparently taken off of the link forums. I believe the accumulators came on both FWD and AWD 2g DSMs.

Accumulator - 2ga - MD746400
Accumulator - 2gb - MD749915
Long hard line - MD746084
Short hard line - MD745644


1qkfwd
(Member)
01/21/10 07:40 PM
Re: QM twin disc questions

I run the QM on my talon. I love it. I have the 2G slave and accumalator, I can slowly the pedal out and inch the car forward as needed. I probably couldnt do that without the accumalator. No stop yet I run the pedal a little low. I talk to shep about the stop he said over time it can over extend the fingers on the pressure plate, and cause some stuff to warp. I like the idea of installing a stop where the switch is. I looked right over that.

GSTwithPSI
(A hole)
02/06/20 11:19 PM
Re: QM twin disc questions

Bringing this back thanks to Andrew's suggestion. Ordered the accumulator to try and further tame my QM clutch, so I'll report back in 2 years when I actually feel like wrenching on the car.

slugsgomoo
(god hates stupid people)
02/07/20 01:16 AM
Re: QM twin disc questions

by then maybe mine will be back together too!

GSTwithPSI
(A hole)
02/07/20 07:28 PM
Re: QM twin disc questions

Scratch that. Dealer just emailed me:




turbowop
(Hard Snarker)
02/09/20 03:11 AM
Re: QM twin disc questions

I had to find mine at a junkyard. Of course I never got around to installing it and went back to a single disk because I don't give a shit about racing anymore. Sold it to somebody. Don't remember who.

thecman02
(too lazy to look)
02/12/20 05:52 PM
Re: QM twin disc questions

You sold the QM to me. I ended up putting "street" friction disks with Tim Zimmer's Gear Drive setup. It worked great. You also sent me the accumulator and I didn't want/need it. I ended up selling it for a case of top shelf beer haha.


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