I have had ACT Street strips and unsprung 6 pucks. The street strip is like butter. The 6 puck you pray for no traffic. I want something that engages and drives like the Street/strip but wont slip under 450-500 to the wheels. Drives on the street and will do various track duty. Is the twin Plate the way to go? What kind of experience is it driving with a Twin plate Clutch? I know the price is double but worth it if it holds.

 

i'll buy your old pressure plate

 

Thats gonna be my next clutch. Its supposedly exactly what you are looking for. The Japan guys swear by them.

 

Thats the Money shot. Dee says to go with the Mcloud twin plate.

 

I disagree, most double plate(and triple) clutches are on/off, the advantage is you require less clamping force (do to greater surface area), and therefore have stock pedal pressure. What it sounds like you want is "slippability". You can get this up to a certain amount of HP by using an organic disc(like stock), with a stiffer pressure plate(ACT extreme), or the next step up would be a bronze(or kevlar or ceramic) disc with a more moderate( ACT street/strip) Pressure plate. You basicly have two choices, less pressure(which will allow slipping), with a disc that can take the heat(bronze), or Huge clamping force(with an organic disc) to allow for stock initial engagement, but then hold (due to the extreme clamping force).
All this said, you can spend 3-5k on a Tilton carbon/carbon, get stock drivability, and less than stock pedal pressure, faster spool up, and a clutch that will last a lifetime of ordinary driving. Hope this helps, but to say the Twin discs engage similar to stock really depends on the friction material, not the fact that it is a twin disc. Carl

 

Thanks Carl. What Clutch would you suggest for my application?

 

Carl,
Have you ever driven a multi plate clutch? Just curious.

 

93R1, YES, TRD twin disc, HKS triple, ACT extreme w/stock disc, ACT street strip w/stock disc, ACT S/S w/6 puck. Some on my 7, and some on my, or others Supras.
Zoom, I am assuming you mean 400-500rwhp, so I am assuming < 400ftlbs of torque. I do not know of a reasonably priced clutch that will hold that power for drag racing an RX7, but for a street driven RX7, I would try the Extreme PP, with a stock disc. You will smoke it if you slip it( excessively) by mistake, but it will give you stock engagement, and good holding power, with high pedal pressure(the bad). You can dump it(all the way in to all the way out, one movement), and it will handle drag launches. Otherwise the 6 puck in an organic compound, with an Extreme PP. The Bronze, and the ceramic are very abrupt, the organic disc (or Carbon) is the key to smooth engagement. I have not tried kevlar, but a full faced kevlar disc should stand the heat better than stock, and still engage smoothly. I am currently running an Extreme PP, w/a stock disc, it is great, but if I forget to let the clutch all the way out, I smoke the disc. That is at ~325rwhp. I have a years road racing, ~3000 miles of street, and ~20+ 5000 rpm drag launches on the clutch, and it feels like the day I put it in. Just my opinion. I am putting an ACT Street Strip PP, and a Bronze disc in my Supra next week, to handle ~600ftlbs of torque with "streetable engagement". The bronze full faced unsprung disc with a dual mass flywheel is good for ~800ftlbs, and is slippable, until it stops slipping, and then HOLD ON

 

www.southbendclutch.com their number is 1-800-988-4345 ask for Eddy. I'm not sure if they will have something that fits what you want, but they might, it's worth a call.

 

I have a hks twin palte at the moment and it is all or nothing not ideal for the street at all but you shoot from the line really well. I recently sold one that had a mazdaspeed twin plate clutch which was also the same.
In my experience a twin plate is not too streetable in my opinion.
rgds

 

If you are going to buy a multi plate, then look at the Exeddy units or OS Giken. I have had experience with Exeddy and the clutch felt great. It was ON/OFF, but it wasn't anywhere near "slippable." I think that it's all about how smooth YOU are as a driver. I know guys that can't smooth an ACT S/S clutch setup on a 300rwhp car. Just like I know a few guys that can smooth an OS Giken twin plate with a 500rwhp FD. It's about 35% driver and 65% clutch on streetability. But I personally love the multi plate setup. I know that's what I'll be running as soon as my project FD is finished. That is going to be a 500+rwhp 13B-REW. I hope that my perspective was at least somewhat helpful. If there is anything I can do for you please feel free to PM me. I have a pretty good hookup on the two multi plate clutches I mentioned above. Laterz.

Zach

 

I guess the term streetable is also dependant on where you live and do most of your driving. Mine being in London sitting in alot of traffic makes a twin plate not very streetable for me.

rgds

 

What about the clutch being offered by Pineapple Racing. They claim and as I said they claim it holds upwards of 500 hp or more without slipping and is the type that you can slip more. I have an e-mail from them somewhere I'll look for it and copy it over.
-Nic

 

Ok found it. Not exactly what I remember but they claim that with this puck disk you can slip it more than say the ACT:
You can keep the street/strip HD pressure plate and light flywheel and
simply upgrade the clutch disc without any problems. Going with a puck
clutch will make the light flywheel a bit peskier to drive in traffic, but
at least this clutch you can slip a bit for smoother driving than, say, an
ACT puck

-Nic

 

an interesting and helpful discussion here... i will be installing a double disc this winter and haven't yet done the research. my guess is it will either be a Tilton or Quartermaster product. i ran Quartermaster products in my 12A SCCA GT3 racer. like Tilton, Quartermaster is the real deal. they do race product that have to work. they are generally cheaper than Tilton. while they may not presently offer a double disc for the fd they make double discs and they make rotary clutches. they also answer their phone and give great service and are located conveniently near chicago. i have their catalog and expect they have a website. interested parties should check them out. i know i will.
howard coleman

 

You should be able to buy Quartermaster, and Tilton from Mazda Comp if you are a member. HKS is a Tilton FWIW. HKS, and therefore Tilton, is one of the least Streetable of the group. Organic, or Kevlar discs in a multi-plate might be a good way to go if available. One advantage of the Tilton is Truechoice will rebuild them for a couple hundred dollars. If I were going to buy a multi-plate, I would buy one that is rebuildable in the States, at ~1200-2000.00 I would hate to throw one away. One other advantage to a single plate (high clamp force) set-up, is that it engages smoothly, so it does not have to be slipped as much, this will greatly increase your flywheel life as compared to a bronze or ceramic disc. Again Carbon/Carbon is the ticket (but for price), engages like stock, handles heat like bronze(but won't weld itself to your flywheel), and uses the multiplate design advantages.
I think for most, "streetable" means smooth linear engagement, so either the material engages smoothly(organic), or the material can stand the heat of slipping(bronze). Anyway, it is true that you have to have "touch to drive any race clutch(which all of these are) on the street. If you buy a race clutch, and slip it to get "streetable", it will not last as long as you would hope. Later, Carl

 

On the Pineapple clutch.

I am running one of Rob's disks which is their "special" compound in 6 puck configuration with a sprung hub. I am using the Extreme PP go with that. Rob told me to choose a PP that was inline with the power that I expected to make. I will be tunning in a a few weeks but should be over 400RWHP so I choose the extreme. He following that with this configuration I would have the holding capabiliy and durability of a metal without the harsh engagement.

I can say that this clutch is abrupt, but CAN be slipped. I have a large street port and an AL flywheel, so it takes some getting used to from a stop, but thus far I've been very happy. Engagement is positive and it feels good. I'll report back after I'm tunned and running the boost I intend to run as to it's power durability.

-Chris

 

I use the Spec 4 Puck sprung Hub clutch and love it. Its easy on your leg and holds plenty of power.

Jason

 

i used an act six puck and extreme pp. the thing that made engaging it the easiest was upgrading to the FEED big clutch slave! one of the nicest things i bought for daily driving.

if anyone wants an iron disk i have a used for one sale. caution it will break every drivetrain part if you aren't careful

 

CARL---Neither of these count "TRD twin disc, HKS triple"

BOTH are just exedy, and Exedy IMHO SUCKS the big one, just a other disc added onto a stock clutch

What about OS and ORC?

 

Um HKS is Tilton last time I checked, don't know about the TRD. As for "counting", whatever makes you happy

 

OS Giken and ORC are the two best multi plate companies out there. SpiritR, from what I was told by my local Exedy dealer (who uses those clutches on his track car) the discs that Exedy uses are OS Giken discs. I'm not saying that it's absolutely true, but the dealer has no reason to lie about it either. Plus he could get ORC and OS, but chooses to use Exedy. I just got a good hook up on an ORC clutch for my project FD so that's what I'm going with. But I surely wouldn't use the HKS or TRD multi plate setups. They are the "bargain basement" lineup for multi plates. Just my .02

Zach

 

There are upgraded clutch slaves! How much are those things anyways, and where do you find stuff like that. Could you make a bracket and have 2 stock slaves feeding off the same master? Or would that even work?

 

anyone tried the RPS carbon-carbon single or twin disc?
The supra guys swear by it.

 

RPS?? I'm not familiar with that company. Could you give some more details or a website to look up that product Astro?? I know that we'd all appreciate it. Thanx in advance.

Zach