What clutch do you use?
Turbo Mini Forums

I'm still on the std verto one ATM... but thinking of changing, I doubt slicks and a std clutch are going to work well LOL.

So what do you use?

Alex

AlexF

single grey,
backplate lugs machined to 23.5mm
AP organic road/rally plate

and no problem with thrusts on a grey?

Alex

AlexF

none at all....

i run an orange dia with the same plate as dave i think, AP road/rally item. fine for std boost, might have to change to grey if the boost is turned up alot.

A-series power! 1972|1310|T3 turbo|Omega pistons|Cantre main strap|Orange clutch diaphragm|AP race plate|Comp pressure plate|Lightened steel flywheel|13-row oil cooler|Vernier duplex timing gear|Phase 2 Piper cam|Green air filter|Hi boost carb needle/spring|2"Stainless exhaust|3"Play mini stainless rear box|Jack Knight s/c 4spd gearbox|Jack Knight s/c drop gears|Silicon coolant hoses|Lumenition HT leads|GAZ lowered height shocks all round|Steel flip-front|Rear safety devices cage|Group 5 arches|6x12 deep dish Minilites|Surf blue/Old english white|

Dave, what is the original height of the backplate lugs? Do you increase the pressure of grey diapr.??

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

when I run a grey with a AP organic road/rally plate with the lugs at std hight, I got clutch slip on full boost

Team Racing

Shortening the lugs solved the problem? I had the same problem in a quarter mile run last year; but only when I was using 1,2bar (18psi), and only in 4th gear at 4000rpm for a very short time. (maybe for 2 seconds). Have you ever tried a douple grey dia??

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

what sort of times are you running???

Everyone knows that instructions only have to be read if the thing doesn't work....

quicker than you!!

no bacon butties for you then !!

Everyone knows that instructions only have to be read if the thing doesn't work....

Harry,
Std backplate lugs are 1" (25.4mm).
I did some tests with some fancy machines we have at work and realised that full clamping force is not being attained with a grey, becuase the actual 'body' of the diaphram (cover) is deforming because of the stronger spring used on the grey. (the same basic cover 'body' is used on all covers, except for a few tackwelded pieces of metal). This still happens on the orange of course, but to a much lesser degree.
My test showed that peak clamping force, with a brand new friction plate, with a grey diaphram, was achieved at 23.5mm.
Put it this way - my clutch slipped after only a few thousand miles before (it wasn't even worn down to the 'embossing' in the friction material. After the change, and two further rolling road tunes, it still holds just fine...

* Off to the Lathe *

:) Sounds great Dave. Noone has EVER mentioned this before.

Dave, thanks for this interesting information! Good research!
Harry

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

Whats the pedal feel like with the grey? compared to standard verto as i only have experience of verto :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

bumpio :) i do alot of town driving so realy would like to know the answer to this.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

not sure if you have seen my post just below this one also about clutch but you will see i have a comp AP plate with orange cover and it does not bite very hard and i can slip it and the pedal is hard but very acceptable.
soi guess the grey wouldonly be a little bit heavier

179hp on 12psi 1293cc of pure A series
14.0et @101 mph

I find a grey is fine, although my mrs did complain it was a bit heavy, but she still wanted to drive it all the time

Team Racing

Cheers :) was jsut worried as i spend alot of time wirth my foot on the clutch crawling about the city centre in rush hour :(

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

sure a grey diph isn't the best in town jungle , but you can use neutral instead of staying with your foot on the clutch pedal


fab

welo the trouble with glasgow centre is thers alot of lights on steep hills, so slipping of the clutch is a necesity, besides every time i change to neutral the lights go to green, so its not an option

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

I mounted the Metro clutch master cylinder with a -4 SSbraided pipe frome the master to the slave with a grey dia. - and the pedal effort is much less then with the original Mini setup on my other car with the orange diaphragma! Try it! you will be surprised!
Harry

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

metro master cyl a smaller bore? wil the pipe fittings from the mini setup work?

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

I fiitted a selfmade "bigger bore" -4 SS braided pipe from the master directlly to the slave cylinder. I opened up the outlet/inlet bore of the master and Minislavecylinder to 5mm. Maybe there is a reduction in friction of the moving transfer fluid?!; I never measured the bore of the Metro master! Is it smaller? - maybe the reason?! (Bought the parts from Think Automotive)

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

well the bore of the pipe wont affect the static pressure (when ur sittin with ur foot onthe clutch) mety m-cylinder must b smaller i guess :S

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.