Torque capacity of a 325i clutch

[Turbo-Brown]

Hello!

Does anyone happen to know how much torque a standard Borg and Beck 325i clutch can transmit?

I'm about half way through turbocharging my dear ol' brown coupe and am looking at about 320Nm of torque but I suspect that the standard clutch might not be too happy.

Cheers!

Alex

[Ant]

been having the same thoughts M8 all I can say is Bexley motorworks used a stock BMW clutch kit in their 240bhp/230 lb/ft monster track car with no issues @ all, still on it to this day I believe.

I have swopped to an allegedly upgraded EBC item but I dont think its much different TBH.

what turbo you using dude ?

with yourself I make that 4 'charged e30s in the making and why not

what boost are you planning to run? , I'm guessing 10psi based on the figure given in your original post

welcome to the site BTW, long time browser or stumbled on us recently ?

not prying, just feeback is a good thing

[H35-IAN]

ant u bad bwoy get on msn we neeed to catch up on a few things lol!!

[Turbo-Brown]

Hi Ant, I'm new here I'm afraid, got sent over from the BMWcarclub thingy.

The turbos are from a skyline with the boost turned down to a puny 6psi. Does mean I can keep the compression standard at 9.5:1 though which is nice.

The other bits going on it are a set of throttle bodies, a pair of intercoolers (overkill with that little boost I know) and an Emerald M3D mappable engine management system which takes care of the fuel and sparks (junking the dizzy too) and can handle positive manifold pressure.

[Ant]

two small intercoolers is far better than one huuuuuge mother dude so that should help bigtime, I have 3 IC units now, still not chosen the final unit to use though

useful link : http://jdturbocharging.com/11701.html the guys done all the hard work for us shame I didn't find that baby until last week

the emerald is a superb bit of kit, truly the best for this application, I have gotta finish the fab work on mine this week, I'll get her running using a FMU with some yellows from a 535 and tweak to about right( ie safe) AFR , then off to see Dave Walker and part with a large wad of Ԛ£Ã”šÃ‚£

I've been keeping a log to help others out with regard to this, maybe once we've all finished tweaking our projects we could collate all the info and add it to the tech articles section ?

keep us posted M8

[Turbo-Brown]

Yeah definately, although I wasn't really planning to do this conversion just yet as I'm almost finished doing a similar thing on a mates car. Comically, it's taken us over a year to get 3/4 of the way through his whereas it's taken me about a month to do 1/2 of mine.

How much boost you planning to run and what turbo you using?

That site's a goldmine! Kinda wish I was only using the one blower now! But then again, I'm fairly sure that most of those not in the know will think that two turbos means twice the power so it has posing factor I guess

Think the main problem I'm gonna have with mine is plumbing up the exhaust system so that it doesn't cook anything like the steering column, still, there's tonnes of room beside the engine so I should be able to make something fit.

What's an FMU by the way? Never heard of one o' them.

[e30_Turbo]

One FMU coming up.....

http://www.cartech.net/fmu2020.htm

[dale325i]

i was looking into getting a better clutch set up last year for my 325i sport and came up with www.centerforce.com who do a dual friction clamping clutch for the e30 with 90% more holding than a stock clutch, i run 125bhp of nitrous through my standard clutch and it seems to be fine, thou who knows it could be slipping with out me really knowing

[Staty]

Cheers guys, it all seems very possable to do! But the thing is i still wouldnt know where to start, and i think turbo charging rather then supercharging will be the way forward for me! If there is anyone out there who would like a fantasick project in the next few months and would also like to make some cash on the side, please come help me make my e30 faster then the sun! I will pay for all the parts, and everything else thats needed, but to be honest i have no idea how to fitt them! Its not that im stupid, just not very tecknicly minded unfortunatly! cheers guys stat

[Turbo-Brown]

I'd be interested to see a supercharger conversion, probably a bit easier than turbo as there's so much room on the inlet side of the engine (at least there is on mine as I don't have PAS)

As a breif run down though, my engine rebuild has cost best part of a grand.

The ECU and associated bits was Ԛ£750.

Turbos Ԛ£200

and the list goes on.

About Ԛ£4000 is what's it's looking like coming out at so it ain't cheap!

[g57yle]

i was running 10 psi and it was slipping all over the place!

[Turbo-Brown]

Something I have considered is machining the flywheel by 1mm or so to increase the preload on the clutch.

[e30_Turbo]

I've heard a few diff opinions on stock or aftermarket clutches, some use the Center force Dual Friction Clutch and others such as listed here:http://www.clutchnet.com/make/prodDesc.html

I'm very interested to know how long a stock clutch will last, as most of the writeups on e30 turbo conversions state they had upgraded to a higher spec.

I'm probably gonna get one ahead of time as although I have faith in BMW stock parts, 170 - 210bhp it may be able to handle easy, what about 250-300?? My own feelings are it will take it for a few runs, but not for too long.
And I'm not doing this conversion to take it easy on the clutch and thats for sure!

And if we are gonna get upgraded ones then a group buy may be in order!

[Turbo-Brown]

I tend to be quite light on clutches (and brakes for that matter) so I'm hoping that it'll last for a while. Obviously not as long as it might otherwise but it only cost Ԛ£40 for a Borg and Beck one so it's no real loss!

[g57yle]

if you are taking off the gearbox or take the engine out which gives you nice accesebility to the clutch then order one from clutchnet! i have one and its beutiful, No more slip! however if your not going to have easy acces to it, then just modify you engine and later you can always buy one,

good luck!

[diegom6]

Mine is almost new( disc and plate) OEM, and about 14 PSI with the T4 started to slip.

[lentec]

Ive got an oem clutch altho its a later type with holes round the outside i presume they are for cooling as the original didnt have them!
When i first fitted the PHASE1 2.7etc i left the 316i diff in it! it would easly lift the front wheels in first and second!!
Problem was it only had a top speed of 95mph @ 6500rpm
but the clutch handled it no problems at all!

[Turbo-Brown]

Sweet, standard (cheap) is the way!

Also good is that my new clutch is nice and light (what little pedal I have without having bled it).

Fitted a Helix organic disc and uprated pressure plate to the Mi16 and it's heeeeeeavy. Still, not my problem!

[Karan]

can i just add i have a stock bmw clutch in my 2.7 with 220lb torque which is a fair bit less than u guys will have..... and if ure doing monkey antics like doughnits etc...... for a period of time it does eventually go soft.

and it will put up woth about 6/7 consecutive standing starts before i start to feel that its gettin soft... on inspection when the gbox was out i was gonna change the clutch and had a new one to go on,,,, but didnt bother cos there was still loadsa materialleft on the friction plate......
so im guessing u guys will need a better than stock clutch if u wanna really piss around... otherwise in normal mature/grown up driving stock will be ok

[e30_Turbo]

otherwise in normal mature/grown up driving stock will be ok

Whats that then?