Clutch Selection!

[Mr Gears]

Does using a clutch with 3000lb clamp pressure require much more pedal effort?
Has anyone measured this?
How does this effect the crankshaft? (crankwalk)

Ive used the 2400lb 3 puck race exeedy clutch.. i find it to be total crap.. it hasnt lasted in my car and i know of other high hp applications that it died very quickly in.

Died? Please elaborate? There are many ways that a clutch can fail.

ps The clutch disc in the picture looks nice (exactly the same as the CI item that we stock).
Has anyone heard of damaged hubs with that type of plate.
Do they hold together better than the XCD sports (4 spring hub)?

SO if we were selling the exact same disc and a second hand pressure plate thats been ground and upgraded to over 3000lbs (and then painted)
JSTYLE would then be recommending our clutches.

I will look into it today. What colour would you guys like it to be painted?

 

[runuts]

From personal experience, the flaws associated with the name brand clutches are almost idental, especially the multi plate variety.

Multi plate problems - OS GIKEN, Exedy etc

* They look pretty, which is prob the selling point.
* Now, when they clamp up, they distort and rarely use more than 60% of the available clutch disc surface. This i've witnessed on everything from nissan, mitsusbishi and toyota.
* The biggest issue i've found, especially on a mitsubishi 4g63 setup, is that they are incredibly heavy. Which pretty well guarantees you wont be changing gears at high rpm. For those who arent aware, the weight of the clutch assembly, adds an inertial weight to the gearbox input shaft. Now unless you are running dog engagement synchro's, it takes alot longer to increase/decrease the speed, and thus gearchanges at high rpm become a problem.

Now back to custom clutches.

Simply, Jim Berry's name is brought up every time a performance clutch is mentioned. Simple reason is, he knows his stuff. While he isnt the cheapest around, he will give you something that does everything you require perfectly. He certainly knows what works with evo's. For those who dont know, make a quick call to Steve Bell of Ralliart australia, and i'll put money on him recommending Jim Berry.

For anyone considering a multiplate clutch, personally I see no reason at all for any evo/vr4 with under 850hp. Off evo's a bit, but even some of the fastest street/gtr's, some into the 8's are running single plate clutches.

 

[JSTYLE]

Does using a clutch with 3000lb clamp pressure require much more pedal effort?
Has anyone measured this?
How does this effect the crankshaft? (crankwalk)

Ive used the 2400lb 3 puck race exeedy clutch.. i find it to be total crap.. it hasnt lasted in my car and i know of other high hp applications that it died very quickly in.

Died? Please elaborate? There are many ways that a clutch can fail.

ps The clutch disc in the picture looks nice (exactly the same as the CI item that we stock).
Has anyone heard of damaged hubs with that type of plate.
Do they hold together better than the XCD sports (4 spring hub)?

SO if we were selling the exact same disc and a second hand pressure plate thats been ground and upgraded to over 3000lbs (and then painted)
JSTYLE would then be recommending our clutches.

I will look into it today. What colour would you guys like it to be painted?

It failed in terms of it started to slip.. and no.. no crankwalk at all.
How does your clutch builder strengthen the pressure plate?
I have supplied about 5-6 clutches to guys on this forum and galantvr4 and they all say pedal feel is like stock.. actually better then stock.. its not firm at all.. its cos we modify the pressure plate in a different way to what exceedy do to theirs.

How can you say its the same disc? you dont know what composite material it has etc.. but id be interested to know.

If you want an honest opinion send one down to me and ill do some R&D for ya See how long it lasts lol..

Also what price are yours selling at? Mine are around $550.

Jon

 

[JSTYLE]

For anyone considering a multiplate clutch, personally I see no reason at all for any evo/vr4 with under 850hp. Off evo's a bit, but even some of the fastest street/gtr's, some into the 8's are running single plate clutches.

Please fill me in on why Rob Barac in his 'under 850hp' evo is using a twin plate clutch cos he only has 550kw ATW ~780hp

Im very interested to know this.. Also Cemal, who builds this twin plates also has less then 850hp and runs 10.4 on street tyres.. why does he use a twin when he can opt for a single? Im very intrigued by your comments on clutch setup.

Jon

 

[runuts]

For anyone considering a multiplate clutch, personally I see no reason at all for any evo/vr4 with under 850hp. Off evo's a bit, but even some of the fastest street/gtr's, some into the 8's are running single plate clutches.

Please fill me in on why Rob Barac in his 'under 850hp' evo is using a twin plate clutch cos he only has 550kw ATW ~780hp

Im very interested to know this.. Also Cemal, who builds this twin plates also has less then 850hp and runs 10.4 on street tyres.. why does he use a twin when he can opt for a single? Im very intrigued by your comments on clutch setup.

Jon

Well Jon, I think you will find Rob's car makes more than 850hp.

Cemal's car also, I dare say its his personal choice to run the twin plate in his car. Not sure, as I dont know him or have ever spoken to him about it. Alot of people opt for multi plate clutches as they are led to believe these are the best option. In some instances it may very well be, but you must factor everything in, such as gearbox choice, hp, tyre choice etc before that.

You can certainly run 10.4's on street rubber with a single plate. I stand by my lack of need for anything other than a single plate til you go past 850hp(engine).

 

[JSTYLE]

ok.. well i know that Adrian (3diamonds) fried a single clutch running mid 11s.. and Joey (boostlover) fried a clutch running 10.9s.. and they are both running twins now for the fact that the singles couldnt hold the power for long enuff..

anyways id be interested to see your car run and see what times/power and what sort of setup you'll b having.

Jon

 

[runuts]

ok.. well i know that Adrian (3diamonds) fried a single clutch running mid 11s.. and Joey (boostlover) fried a clutch running 10.9s.. and they are both running twins now for the fact that the singles couldnt hold the power for long enuff..

anyways id be interested to see your car run and see what times/power and what sort of setup you'll b having.

Jon

Well the same clutch I'm running, has proven to be reliable with 10 second passes and friendly for street driving. Can certainly go a beefier single plate than what I have, but my vehicle is predominantly a street car, and that had to be factored into the clutch design.

Well you wont have long to wait to see what my car runs, or the full power potential of it either.

What details do you want to know about my setup? there are no secrets with it, mind you alot is different now to what is listed in the readers ride section. I prob should update that actually.

 

[Entaran]

I'm actually going to put my hand up and stand by jon's clutches.

I had one in the last vr4 and it withstood a full year and a bit of abuse, endless hard launches, hillclimbs and LIGHT rally work. It never gave me any hassles and NEVER EVER slipped or even showed signs of slipping. It was still going strong when I sold the car on. Pedal feel was firm but not heavy by any standards, although my mother used to complain.

As for crankwalk, I could care less. Unlike quite a few of you, I run a 6 bolt motor which isn't vulnerable to it.

This is my own real world opinion. I don't know anything about clutches to debate the finer point.

 

[kayarubin]

just a twin plate and u never worry about it again! :?

what is the diff between twin and single plates? is it just the clamping area or is there anything else thats better/worse with the twins??

cheers!

kaya.

 

[Entaran]

Twinplates aren't streetable. Well they are, but you'll get frustrated of them within 24 hours.

 

[bazeng]

im also using one of jstyle's clutch

i haven't had the car on the road for long enough to tell me if it will last, but it has so far withstood 10 hours on the dyno and is going strong...

but the 3 broken driveshafts was the downside, the engagement is a bit harsh... snapped 2 from a stop, doing a turn and broke one launching (although it wasn't really a launch, more like hopping)..

 

[Entaran]

Yeah, the engagement is definately harsh, but you learn to get around that. You can actually slip jon's clutch at the very start a TINY bit before it bites down.

I think your driveshaft problems were more related to the huge amount of power you're pushing rather than the clutch being evil incarnate however. And the fact that you were running in FWD, not AWD.

 

[kayarubin]

ive got a twin plate OS giken clutch and its not that bad....cept for the hard pedal!....it feels like a normal clutch bite wise but its just a heavy pedal compared to the stock one! i am using the cable type clutch too!, not hydraulic like everyone else!....that makes a difference with hardness of the pedal aswell!

im just waiting for the cable to go BINK! and slap me in the leg when it breaks touch wood i doesnt tho!

cheers

 

[3diamonds]

Please fill me in on why Rob Barac in his 'under 850hp' evo is using a twin plate clutch cos he only has 550kw ATW ~780hp

Im very interested to know this.. Also Cemal, who builds this twin plates also has less then 850hp and runs 10.4 on street tyres.. why does he use a twin when he can opt for a single? Im very intrigued by your comments on clutch setup.

Jon

you need a twin plate when pushing big power. using a big pressure single plate won't hold for very long, it's also not as forgiving on the driveline, and having big pressure on the crank can wear out the crank thrust.