This is for your ? you have duramaxedout. I didn't want a problem with the heading of the old thread like before. Got a new one on it now and still no luck I guess I will have to wait and see if this second one will break in sometime (already have 300 miles on it). Seeing how there is no other products avalible righ now. And yes I know of Mac's Preformance. Was told the first one didn't look broke in yet even though it had been slipped and had 1500 mile on it. (1000 of them high way but there was still shifting involved in it.) I don't know if the kevlar(sp) has to be slipped a lot to get broke in or not. I would not like to think that is what is suppost to be done but maybe with this hard of materal it has to be. Any thoughts????:help2: But this second time I have another new DMF, pp, Clutch, and slave cylinder and still slipping. Peter said he would work with me and that is why I'm going to wait for his new set up cause hes been good to me just wish i would have waited if I knew I would have this much trouble. It's just my luck I guess. Everyone else is haveing great luck with it just not Nathan. I can't understand of my space in my bell housing must be smaller or something. I hate bugging Peter with it but I just don't understand what is wrong. Everything was put together just like it is suppost I just don't know why it don't work. He said he'd work with me but I would like to take it to them to do the next one so they could find why mines different. It seems like we would just be throwing parts at it to put another one in it, there has to be something different about my truck cause there is no way two of them could be bad. I haven't talked to peter yet cause there is nothing more we can do till he gets the new set up up and going. That And I want to wait alittle longer to see if it gets better but I just don't think it should be slipping at all. Do you think that slipping the clutch is what i should do to get it broke in or just keep driving it normal? Thanks for your help and thoughts.

Nathan

So does the new clutch slip with the PPE on or just in stock tune? Does it do it immediately or after you have been driving it for a bit. I with mine when the edge is up it starts slipping after he starts to heat up...but my clutch has to be toast from some hard driving. I definately agree with you that the Kevlar shouldn't need to be slipped to get broke in since basically all that would do is generate heat on the clutch. Peter is a great guy and I am certain he will work with you until this issue gets fixed. Deadeye and I will be doing some experimenting with the hydraulics to see if we can figure this out. My guess is the slave cannot produce enough holding pressure on the clutch.

It can take 3,000 miles for the single SBC Kevlar disc to develop holding strength -- at least it took that long for mine...

I was nice to it for the first 1,500 miles, and then nice to it most of the time with occasional light abuse. It slowly grew strong and stronger.

Over time the clutch went from slipping in 3rd with any tune to holding the Quad 215 all the way through 6th. All told it was around 3,000 miles...

I have it on the 3rd level of 4 on the Hot PPE. It seems to be getting better but I hate slipping it but not to sound stupid as I know this is how it will sound but the more I slip it the better it feels.??????????? The last one at 1500 miles never got any better but this one at 400 miles feels much stronger than the last one and feel a lot better than it did at 300 miles before I thought to let it slip to see if that would make it break in better. I slipped the first one a little and peter said it didn't look like it had been driven any further than down the street and then back to the shop. He said it didn't look like I had slipped it at all and I had but just by a couple hundred RPMs every time about 15 times. Do you have any thoughts on that idea?? By slipping it I mean accelerateing throught clutch a little more than just a couple hundred RPMs on occation.

Also heat makes no differance I don't think. The new slave cylinder made the clutch pedal feel much better. It's as smooth as a hot knife through butter now. Also when the clutch slips the pedal doesn't get hard now.

Everything I read about Kevlar clutches said *not* to slip them during break-in, so I was initially very easy on it. It did seem to get stronger, faster, once I slipped it more, but it would probably be a good idea to get some more miles on it first. You may want to see what Peter has to say on this.

I wouldn't be surprised at all if your clutch's holding capacity increases 300-400% over the next 2,000 miles. I never thought it possible, but it happened to me. As to how or why -- I have no idea...

So does the new clutch slip with the PPE on or just in stock tune? Does it do it immediately or after you have been driving it for a bit. I with mine when the edge is up it starts slipping after he starts to heat up...but my clutch has to be toast from some hard driving. I definately agree with you that the Kevlar shouldn't need to be slipped to get broke in since basically all that would do is generate heat on the clutch. Peter is a great guy and I am certain he will work with you until this issue gets fixed. Deadeye and I will be doing some experimenting with the hydraulics to see if we can figure this out. My guess is the slave cannot produce enough holding pressure on the clutch.

I see you like the juice Michael!!! You comming to the sled pulls in Pueblo?? Give me a call sometime, haven't talked to you in a while.

just to clarify something, the slave doesn't produce any holding pressure at all, it's function is to extend outward to press on the pressure plate fingers to release the pressure on the clutch disk. The clutch pressure plate would be the item your refering to not having enough clamping force.

I would think that since the disk is made of kevlar it requires different break in then your typical clutch setup, from the sounds of it, it's probably extremely resistant to wear since dmaxfarmer was able o slip it on several occations and not do any damage. I think that once the kevlar disks are worn flat and have more surface contact his clutch will work like he wants it.

Just my .02

Cheers, Wade

If it is slipping with the tuner, why not run it stock...until it is broke in??

Have you seen fuel prices?? I get 4 miles per gallon better with the chip on this setting than stock. Thats the main reason. We all know the other. I will call him ans see what he says but last time he said to just keep driving it to see if it breaks in later and that was at the 250 mile marker and at 1500 mile it was still no better but he was like the others that I knew had the clutch set up and didn't think it should have been slipping at all in the first place because theirs didn't hence why I pulled the first one cause he and I didn't think that it was acting right.

MI_joe2 is yours the SBC set up or Macs set up?

I'll back back out of it but 1500 miles it was still weak enought for a sniff of boost to make it slip on the first one and this one was the same way till I slipped it a little more than I would like. Havest is coming on here in a couple 3 weeks maybe (if it stays this dry) and the pulling and fuel mileage will become very critical. Peter just acted I think like even he didn't think that it should take that long to seat in. I'll just have to wait it out and see what happens cause as of now this is the "best" out their for power and everyday driving. I am getting pretty good at this clutch replacement stuff though:rolleyes: . I will say this one engages much much smoother than the old one. It could be that I have slipped it too that makes it that way. I don't know thats why I'm on here.
Thanks for the ideas and I can always use more.
Nathan

MI_joe2 is yours the SBC set up or Macs set up?

Yes. CPMac used the SBC single kevlar disc as part of his setup for my truck.

The custom pressure plate he used is *very* strong, but mine did slip initially as well. Hopefully yours will get stronger as well. If not, you may need a stronger pressure plate. The kevlar clutch is definitely durable, but I still wonder if its holding capacity is all that great.

Initially I wanted to upgrade to a dual disc setup, but I am thinking that a single, feramic disc is probably better for my purposes (drag racing not truck pulling).

Hopefully you'll be able to get your hands on a solid flywheel soon as well -- your going to need it!

Good luck, and keep us posted.

Thanks. I'll give this clutch one more week of break in time 200-300 miles and if it don't get any better then I'll give peter a call and see where we will have to go from there or what I need to do. Thanks all.
Nathan

One of the things I learned about the DMF is that it's setup and the stock PP do some self adjusting after installation. Peter believes that this is the problem that causes the hard pedal problems. After I installed CPMac's kit I never had the same problem again. I did have a constant tough to push pedal but that was due to too many shims which reduced PP pressure, caused more squeal and wear, and made the PP diaphram springs put a lot of pressure on the SC. Once I moded the kit most of the problems reduced significantly and I still have no slippage, tough or hard pedal, and little squealing. I do still have some grabbing at start. However I did have to replace the SC but wow, I had forgotten how a stock clutch felt !! Anyhow, I don't think the clutch plate is the real issue. If you are still using a DMF and stock PP they are likely the problems you will have to deal with for a while.

I am hoping to post some more process status on the SuperDiesel-SBC flywheel/clutch kit development very soon.

Duramax_Farmer: So how is the clutch doing? Any better?

Well I have been easier on it and seems to be doing better but it still slips when I go to pass some one but it just seems to let go real quick and then I think it "bites" back ahold. Don't know if it does cause I let off of it so quick when I feel it let go but the RPMs don't just fly away like it did before so I guess you could say its better but I just don't know why it would let go and then try to bite back in?? Peter said something about the stock PP have a racheting action to it and I don't know if thats why it'll bite back ahold cause thr PP gets tighter or what. I haven taked to him yet about this second one yet just going to give this one some more time before I go bugging him. I don't want him to take time away from our cure he's working on to fix what maybe a sinking ship till I think it is a pretty good chance I'll need to be fixed up with something different. As of now all I can do is wait till he gets a new set up so no use calling him yet till the SMF are ready to install.

Hey Deadeye I would like to offer my services as a test truck. I'm getting pretty good at this clutch swapping thing!):h Anything to get my power to the ground. I'm afraid that I will never know what the power of level 3 is like let alone 4:bawl: and I still have a stock waste gate set up.

D-Farmer;

I appreciate your offer ):h .

However, what I need are seriously interested customers.

If this clutch still is not holding when you guys get done with the new clutches I will be serious as a heart attack about getting one. What do you think that I was just playing around? I need a good clutch and I was hoping you guys were the answer. Do you think that I am posting this for fun cause I'm not I am in dier need of a clutch if this one turns out bad. I am just trying to see what I might do to break this one in to make it work.

Well MI_JOE now that I am being nicer to the clutch it is getting weaker by the day. I don't know what to do other than to call Peter and see how things are coming on the SMF. Its right back to slipping when gently trying to pass someone like when it was new (has 1500 miles of stop and go driving on it now) and the last couple days the peddle has been getting a little hard with any horseing around. Nothing like like the old SC did though. Looks like I'll be dumping some more money into my truck again but what else are trucks and toys for? You have to pay to play I guess. I just wasn't planning on playing or paying this hard.

Sorry to hear about that DF. I sent you a PM, if there is anything I can do to help, let me know.

The new clutch kits WILL eliminate all your current problems, I just hate to see you going through all this right now.

Cheers, Wade