CLUTCH INFO for the Street driven Supra

[andy@sbc]

What most Supra owner’s want in a clutch system is high torque with low pedal effort.
Too much clamp load in the pressure plate is counter-productive. It will slow down shift time. It will cause premature wear to crank bearings, tranny mounts, motor mounts and clutch release bearing. It will accelerate movement in the crankshaft a.k.a. crank walk. And in general, it is not easy to drive.

SBC has developed a clutch kit using a medium clamp load pressure plate with a Sindered Iron (FE) full-face friction disc. This friction material is high torque and has a high coefficient of friction, static .75 on steel mating material GG25 (in the same range as ceramic puck clutches). The result is a smooth engaging high torque clutch, geared toward the street driven car that is occasionally driven at the track.

The key to this system is our full face clutch facing. The clutch industry has mainly used puck style clutches for high torque applications. Puck clutches still have their place in the performance industry but can be greatly improved upon with the Full Face design when a car is street driven. The Full Face disc utilizes waffle shaped sprung steel between the two clutch facings to cushion the engagement whereas puck clutches have no cushion at all. Cushion between the facings is patterned after the O.E. design and is what gives the clutch a stock feel, without sacrificing torque.

Romoved website... Reign

 

[Doward]

:ttiwwp:

 

[andy@sbc]

:ttiwwp:

:icon_bigg

 

[Justin727]

stock pressureplate? Also has this been succesfully tested on a 7MGTE and if so how much hp and trq was it pushing?

 

[cnewingham]

need a lot more info than that to get my attn.

 

[andy@sbc]

stock pressureplate? Also has this been succesfully tested on a 7MGTE and if so how much hp and trq was it pushing?

The PP used is stock modified by tempering the spring and a geometrical change to the fulcrum.

The modified clamp load is 2190 +- 10 for the MK3. Stock is 1700

This Feramic material has been used succesfully on all Supras at many different HP levels.

Feramic is a sindered iron product and is widely used in the performance industry. I have had it manufactured to fit the MK4 and MK3.

Feramic clutch kits are offered in a dual friction Stage 3 (OFE ) and stage 4 (FE) designs for all models of Supra. There is also a Feramic/ Kevlar combination available for those that like the wear characteristics of Kevlar.

OFE Organic and Feramic combo. MK3 = 520 TQ MK4 = 750 TQ
FE two Feramic linings MK3 = 540 TQ MK4 = 775 TQ
FETZ Kevlar and Feramic combo MK3 = 520 TQ MK4 = 750 TQ

 

[Justin727]

will your feramic material WELD itself to lightened flywheels such as fidanza for example and/or stock?

 

[becauseican]

I have a sindered Iron 6 puck spung disk that I got from Competition clutch, about a year and a half ago. I wonder if it is the same as the one you use?. The clutch doesnt like to be slipped, like when trying to slowly drive up a steep driveway or something, it starts to make an amost grinding/ whirring type sound when slipping it. I actually had it stick to my flywheel once while trying to do a donut, I couldnt get the trans in gear with the car running, the pedal was moving but not doing anything. I was able to seperate it by turning off the car starting the car when it was in gear. I wonder if my flywheel is all chewed up.

So in short I am looking for a clutch that can hold 500+ tq and still be slipable. Would the full face disk make it better?

 

[Reign_Maker]

This sounds interesting... I already picked upa clutch for my set up, but who knows how long it'll last with the power I'll be making...

Justin made a valuable point... I was planning on going with a faramic disc, but didnt want the worry of welding it to my fly wheel... How is yours effective against that?

BTW: Andy, if you want to advertise your website, or your products, we have a procedure that we ask be followed... If you are interested in becoming a misc vendor here, feel free to PM me or any of the other mods/admin on the site... You'll recognize mods as having thier screen names in orange and the admins will be in red... Welcome to SM...

 

[Justin727]

So in short I am looking for a clutch that can hold 500+ tq and still be slipable. Would the full face disk make it better?

from what I have been told from others that the full face would be alot better for high hp depending on the material used and its just a tad bit more slippable

 

[IJ.]

from what I have been told from others that the full face would be alot better for high hp depending on the material used and its just a tad bit more slippable

With increased clamp force maybe Justin.

I don't see any mention of a heavier diaphram in the PP just the moddified pivot rings.

Pucks work by concentrating the force over a smaller area so you get more clamp pressure, the full face works by an increase in friction area but without extra clamp pressure a healthy GTE will slip it.

 

[andy@sbc]

I have a sindered Iron 6 puck spung disk that I got from Competition clutch, about a year and a half ago. I wonder if it is the same as the one you use?. The clutch doesnt like to be slipped, like when trying to slowly drive up a steep driveway or something, it starts to make an amost grinding/ whirring type sound when slipping it. I actually had it stick to my flywheel once while trying to do a donut, I couldnt get the trans in gear with the car running, the pedal was moving but not doing anything. I was able to seperate it by turning off the car starting the car when it was in gear. I wonder if my flywheel is all chewed up.

So in short I am looking for a clutch that can hold 500+ tq and still be slipable. Would the full face disk make it better?

Feramic is a Sindered iron product designed to slip upon engagement. This is what makes it superior to Ceramics that have a tendency to be on or off. All friction materials will have adverse affects if they are slipped too long. High rpm slipping for more the 4-5 sec will cause the point of contact temps to reach 1000+ degree. At that temp Organic materials will unravel, Ceramic will flake apart and Feramic will fuse to the mating surfaces. I see most of these problems occur in drag racing situations. NHRA uses Sindered Iron friction material and the clutch is designed to slip when launching but for only a couple of seconds. If it slipped all the way down the track the clutch would weld itself together.

I hope this clears up some questions about the product

 

[IJ.]

Sintered maybe?

 

[andy@sbc]

With increased clamp force maybe Justin.

I don't see any mention of a heavier diaphram in the PP just the moddified pivot rings.

Pucks work by concentrating the force over a smaller area so you get more clamp pressure, the full face works by an increase in friction area but without extra clamp pressure a healthy GTE will slip it.

The pressure plates are 2170 lbs which is aprox 500 lbs increase over stock.

 

[Reign_Maker]

Man, my RPS must be ferocious, its a 3200 pound pp... Get yur clamp on, its yur birfday, you go pp, get yur clamp on, its muh birfday...

 

[andy@sbc]

Sintered maybe?

Thanks for correcting me.

 

[Inygknok]

Man, my RPS must be ferocious, its a 3200 pound pp... Get yur clamp on, its yur birfday, you go pp, get yur clamp on, its muh birfday...

Don't those damn RPS clutches cause problems? I remember it was either those or the Spec models.

 

[born2drv]

i got the 3200lb one too with the hpf full face feramic, got to drive it the other day after the 5spd swap and damn that thing is freaking stiff, nothing like my 5-spd honda LOL. i'm really gonna get a workout driving this car now.

(i know the hpf full face welds to aftermarket flywheels but i'm running a stock one)

anyhow i'm glad to see there are more products for our cars, i hope someone uses it so we can start seeing how well they perform....

andy - if you have a lot of confidence in your products maybe ship 1 or 2 out 1/2 price to a couple of the guys on here making the most power who post a lot.... quick way to get some cheap publicity on here, i bought my hpf setup because of good reviews from fellow members.

if i had to pick 2 people i'd like to see an honest review from it would be IJ and upgradedsupra...

 

[tissimo]

i need something that can take some heat / slipping.. looks like a multi disc carbon is probably the only way to go

 

[yaitsme]

I chose SBC for my build. Went with the DXD (type SS Stage 4 - I believe); I probably woulda gone for the clutch Andy's pushin' here - but I don't remember seeing it at the time. The owner before me had an ACT put in, and I wasn't particularly fond of it.

Of course - I have no idea when my build will be complete ... so I can't be of any real use here, but that's never stopped me from posting before. :biglaugh:

One of my considerations is that the wife will be driving fairly often, and while I love a set of well toned legs on a woman ... I don't want her left leg lookin' like Schwartzagoverner's! We were making 350whp before & the wife was lovin' it - and she's one who'll never own an automatic. I think this build will put us near the 500whp neighborhood, which may be a little more than she needs - but hey ... I've gotta drive it too - and I can't have any Honda's or Mustang's outrunning me, now can I? :naughty:

So anywho ... I'm ready to give this new SBC clutch a try: how much can I get back on an unopened DXD SS4 in exchange?