DIY: "white bunny" clutch setup

[Casey]

So after doing alot of research on clutches and different setups, babowc here told me about white bunny. so i did some research and decided to share the info here.

Flywheel for
Advance auto parts - ~72 dollars
Part number: 50-304

Exedy Oem-Replacement Clutch disc for 1982-1983 Nissan Datsun 280z Turbo
Part number 06032
ebay ~ 120 dollars



Took this from 240sxforums - Member: 240SXAddict
http://www.240sxforums.com/forums/24...tch-setup.html

The "White Bunny Special" was first created and explained on FreshAlloy by member #18, s14turbose, the "white bunny" being his 98 S14 turbo SE. KA24's come stock with a 225mm clutch surface area, but using parts from other nissans allows you to run a 240mm clutch, which by logic gives you more tractable area for the clutch to grab onto thus reducing the chance of slippage.

We used the flywheel of a 1993 D21 Pickup(4 cylinder model), which is the standard flywheel to use because it carries the same crank bolt pattern as our cranks but is a 240mm flywheel. I believe any year will work, 87 being a common year people use but to play it safe use the 93 because I just installed one and it fit fine. There is also talk of lightened 240mm flywheels, but I have yet to see any that arent custom made.

Now the pressure plate and clutch disc are varied. We used the stock setup of the afor-mentioned 93 D21, but common clutches used are off the 280Z Turbo, the 300ZX Turbo, and the RB series clutches. You can use both aftermarket and stock as long as it is 240mm. But one rumor surrounding this special is the truck and 280Z clutch can hold balls of torque, some saying near 400ft/lbs and they still retain stock pedal feel and longer life than aftermarket clutches. I'm still searching for the answer, but I read it went on Mike Lee's T66 KAT, and it had no problems holding 500rwhp.

One very important point is that the 240mm clutch uses 9bolts to hold the pressure plate onto the flwheel, while your stock uses 6. Be sure to pick some up before you attempt this. Also, you'll have to break the small pin on the crank off to bolt up the flywheel, as it has no slot for it.

and of course here are the comparision pictures:

this is both setups(225mm and 240mm) set beside each other



here are the 240 flywheels, notice the O.D. is the exact same, but the surface area and bolt holes are different



the pressure plates... mmmm that just looks good



and of course the clutch discs



disc and plate



beefy!!!



flywheel bolted up



clutch disc on



pressure plate torqued down




And there you have it, the "White Bunny Special". I'll update this if any new information comes up, and of course details after tyler breaks this setup in and gets to go alittle hard on it. Hope this helps!

[babowc]

With the white bunny setup, starter to flywheel engagement can sometimes cause a grind on start, but it'll eventually go away.

I had this setup and just sold it to a member on here and the slight grind that was apparent on startup subsided after many starts.

[Casey]

everyone has said the clutch feel will be like an oem clutch. i think the rotating weight is going to increase. but apparently there is a lightweight version of the flywheel available for 140 dollars to accomodate this. i havent found it.

im going with the steel version from advanced since my bro works there lol.

---------- Post added at 05:30 PM ---------- Previous post was at 05:20 PM ----------

Slip N Slide S14 shared this with me over PM.

I cant pot in the DIY forum for some reason, but I was going to share my experiences with WBC setup.

The truck flywheel is almost 2X the weight as the stock KA flywheel, I actually took mine to a machine shop to have it lightend and they still couldnt get it safely down to the stock KA weight.

Also, the startup issues were terrible. The car would never start on the first turn of the key, the starter alwasy got caught up at least once or twice. It was annoying and shitty in my opinion.

The clutch is pretty heavey as well, it doesnt feel like stock, the pedal has a lot of pressure.

thanks for your input chad, i may not be going this route now.

[babowc]

Another thing I found out about the white bunny setup a couple days ago was that the flywheel touches the trans plate and a small portion of the rear main seal casting.

You'll have to dremel away at the trans plate where it touches and also have to dremel away maybe 1-2mm off the rear main seal.

Where you'll have to dremel is nothing structural. It's where the oilpan would bolt on to. You'll see it.. it's a simple fix.

Also, the flywheel is a bit heavier but there are various lightweight flywheel options and I thought the clutch was quite similar to stock.

It may depend on what setup you go with.
I went with D21 flywheel and clutch setup. I should be getting some response from Joe, however.