What southbend clutch disk is this??

[jordan122345]

I bought this used off a forum member and I am curious what actual clutch disk this is. The seller said southbend told him it would hold 600tq. So hoping it will be good for.my tial 770's. Any help is appreciated as always. Thanks ron

[waB5S4]

A full face disk for 600wtq out of 770s? That seems like a stretch.

[zillarob]

I wouldnt call that full face, but I agree 600tq is prob pushing it.
Is that all you got or is there a pp too?

[waB5S4]

I wouldnt call that full face, but I agree 600tq is prob pushing it.

It looks just like a "full face" FX400 to me. Agreed, not full faced like an OEM/OEM+ replacement though.

[jordan122345]

We should be around 550 to the wheels tq and hp in Denver. And yeah came with a sachs pressure plate and lightened flywheel also

[jordan122345]

https://s3.amazonaws.com/pandlmotors...ineclutch2.jpg

So the guy I got it from had a stage 3 endurance and on his first dyno pull after installing it slipped and southbend sent him the disk pictured above and said that it could handle up to 600tq

[zillarob]

It looks just like a "full face" FX400 to me. Agreed, not full faced like an OEM/OEM+ replacement though.

I wonder how different the 8puck and 6puck disks really are.
I think when it comes to how much they hold, it is about the clamp of the pp and surface area of the friction material on the disk. Basically psi.
Prob same pp and surface area looks similar between the two. Would be interesting to drive them back to back to see if there was any difference in engagement or holding.

[happy2B5]

Have you contacted southbend? Shown them this picture and asked. They will know before most

[jordan122345]

I tried to look for fx400's and this looks close but not quite. I asked Scott at advanced automation and he thought maybe a southbend stage 4 dxd clutch but I don't think that's it but I could be wrong

[jordan122345]

Not yet that is the next step

[happy2B5]

They'll set you straight. Wonder if its the "extreme" street? The extreme drag is a 6 puck but it looks like the extreme street is a "full face"

[MileMan402]

Has 770's. Buy's used 'unknown' clutch. I'm willing to bet that's not a SB friction plate.

[zillarob]

My guess is it is a sb.
I just put an fx400 8puck in, looked very similar, but oem center.

[jordan122345]

The guy sold it to me as an extreme stage 4 southbend so I am just making sure that it will hold I did check with my mechanic first I was just making sure

[MileMan402]

The guy sold it to me as an extreme stage 4 southbend so I am just making sure that it will hold I did check with my mechanic first I was just making sure

You're right, I was wrong. Hope it holds for you.

[happy2B5]

My guess is it will have better luck than that endurance that likely glazed after one pull. Kevlar :thumbdown:

That extreme is advertised as 600 tq. Not sure if that's same for both the full face and 6 puck?

[zillarob]

Id concede full circle, but that disk is def not full faced.

[happy2B5]

True. That's why "full faced". Forgot to carry that over to last post...see #11 :p

[zillarob]

True. That's why "full faced". Forgot to carry that over to last post...see #11 :p

Interesting.
So if it had 6 pucks (ala fx400) riveted to it instead of 8, you would still consider it full faced?
Do you think it would perform any differently if the backing plate had the star shape?

[happy2B5]

???

[zillarob]

Wait, I think Im understanding the quotes now

[happy2B5]

I'm not challenging anything really.

I am curious and want to know if the ability to hold power is as much a product of the friction material itself as the disc design? Or all of the above?

[zillarob]

Lol ya, I didnt catch the quotes.

[happy2B5]

I did "know" what clutch it was though. Hahahaha :sly:

[zillarob]

I am curious and want to know if the ability to hold power is as much a product of the friction material itself as the disc design? Or all of the above?

My guess is the star shaped backing ones are just to lighten up the disk a bit and wont affect engagement or holding.
Weight prob has an effect on shifting at different rpms.

I do wonder what the difference would be between two disks with the same surface area and friction material, but say 4 larger pucks instead of 8 smaller.

[jordan122345]

Okay so it sounds like it really is a stage 4 extreme so are we thinking it will hold with 550tq or no

[zillarob]

The only thing I can add is maybe call Jon up at Southbend and see what you need to do to get that clutch setup as new.
They can do it for you, but he is a good dude and prob give you the numbers if you want to tackle it yourselves.

[jordan122345]

So are you saying buy a new setup or send in mine to get reworked

[happy2B5]

Yep. I'd call up SB. Like I said, it is advertised up to 600 tq. I'd still want to share the pics you have with them and get their take. Only way to know for sure at that point is slap her on and go! Should make for a fun ride.

[zillarob]

I cant tell from the pics how worn it is, but say .005 is worn off of each of the 4 surfaces in there for .020 total.
You could knock .020 off the step and be back to new, or maybe even better because it has already gone through the high wear break in.

[jordan122345]

Okay I emailed Jon at southbend. And the guy I got it from said he had only 400 miles on this disk

[julex]

Okay I emailed Jon at southbend. And the guy I got it from said he had only 400 miles on this disk

put the PP against this fw+cluthc disc without putting any bolts in and measure the gap between PP and FW. This will give you an idea about life of clutch left. Brand new (before break in) measures ~ 0.1" on these set ups. As said above, if you grind FW's step up a bit, you will get more spacing between PP and FW and therefore more life out of the disc. But that is dependant on how much friction pad's thickness is (clutch disc surface to top of pad times two, or measure thickness of disc at pad and then at the disc itself and subtract one from another), measure that too.

[zillarob]

CM was a hair over .080 brand new (and confirmed correct by CM), but the SB should be quite a bit more.
I think this is the reason for so many posts on short lived CM fx400 setups.
Wouldnt surprise me if your SB lasts more than twice as long as its CM counterpart.

[jordan122345]

CM was a hair over .080 brand new (and confirmed correct by CM), but the SB should be quite a bit more.
I think this is the reason for so many posts on short lived CM fx400 setups.
Wouldnt surprise me if your SB lasts more than twice as long as its CM counterpart.

well I really hope you are right so another question on this clutch is how close or far off is it gonna drive compared to stock driveability. And what do you think a ballpark figure $$ on resurfacing it would be

[nynoah]

That is most likely an FX300 or FX350. Difference being material (fiber tough) and not obvious to the eye. I have an FX350 in 240mm and love it. I can take off like a stock car. It is not jerky like an on off switch. I don't think it would hold the power you are wanting to make. At that level you need a FX850 Super Single or more.

[ALE81]

The closest comparable clutch is the stage 3 drag, rated at 550 ft.lbs. I would change disks. Call SB on Monday and ask for Dave. Tell him Drew sent you.

[zillarob]

You prob dont need to have the whole thing done, maybe just cut the step a tad bit. Wouldnt surprise me if a machine shop would do it for 40ish.
Do like julex said and get us a number. If it only has 400mi on it you prob dont need to touch it.

[Scotty@Advanced]

That's a regular stage IV. The Stage IV extreem has an X by the SS tag.

That looks like a very worn ceramic disc too..

[jordan122345]

That's a regular stage IV. The Stage IV extreem has an X by the SS tag.

That looks like a very worn ceramic disc too..

So the pressure plate was from a stage 3 endurance and the original clutch disk was too till it slipped on the first dyno pull so he sent the disk in and they sent him the disk I have pictured. So will that pressure plate work out or no

[PinoyS4]

So the pressure plate was from a stage 3 endurance and the original clutch disk was too till it slipped on the first dyno pull so he sent the disk in and they sent him the disk I have pictured. So will that pressure plate work out or no

I would not risk the clamping force of that pressure plate for tial 770's