6 speed conversion

[M400DPC]

Dear All

Next on the list of mods could potentially be an e46 6 speed conversion and shorter diff ratio.

I'm talking to a BMW tuner who have a quote from quarry motors of £700 for an s54 box from an e46 m3. I'm told the propshaft will need to be custom made for £180 or an alternatve prop from the e36 range could be a possibility.

As regards the diff, to rebuild my diff with a 3.91 ratio, I've been quoted £450 for the rebuild which will include new seals, bearings, and clutches and an upgrade to 40% lock.

Fitting wise, I've been quoted 10 hours at £30 per hour in case there is any fabrication needed of linkages etc. £300.

Flywheel and clutch wise, I've been recommended a lightweight S54 flywheel which weighs 5.5kgs over the standard 15kgs, an uprated clutch with sprung hub plate and 30% uprated cover and bearing.
Been quoted £305 for the flywheel, clutch £230 for the cover, £195 for the plate and £70 for the bearing, all plus vat. Also need new flywheel bolts which are £30 and new clutch bolts are supplied.

I wasn't banking on over £2k for the conversion!

Any thoughts on the above prices and possible alternatives would be welcomed from all.

Cheers

Dan

[indy]

if you want the best shortcut, contact ragerover on this forum.

he has plenty experience and can have this sorted for you

[M400DPC]

Cheers Indy

Rr - you have pm

[c_w]

A common clutch change is to use the E34 M5 setup, think the early ones had a single mass flywheel and the sprung clutch plate (that's probably what you'll be using) but not sure how much the flywheel weighs.

[Dave P]

E46 M3 gearbox swap details,

http://www.z3mcoupe.com/forum/showthread.php?t=15622

[ragerover]

Dear All

Next on the list of mods could potentially be an e46 6 speed conversion and shorter diff ratio.

I'm talking to a BMW tuner who have a quote from quarry motors of £700a bit steep but would depend on milage and guarantee for an s54 box from an e46 m3. I'm told the propshaft will need to be custom made for £180 or an alternatve prop from the e36 range could be a possibility.get your own prop shortened its cheaper

As regards the diff, to rebuild my diff with a 3.91 ratio, I've been quoted £450 sounds fairfor the rebuild which will include new seals, bearings, and clutches and an upgrade to 40% lock.

Fitting wise, I've been quoted 10 hours at £30 per hour in case there is any fabrication needed of linkages etc. £300.you will need the linkage shortened and re welded

Flywheel and clutch wise, I've been recommended a lightweight S54 flywheel which weighs 5.5kgs over the standard 15kgs, an uprated clutch with sprung hub plate and 30% uprated cover and bearing.
Been quoted £305 for the flywheelsounds too cheap mine was about £900 but a great mod well worth it, clutch £230 for the cover, £195 for the plate and £70 for the bearing, all plus vat. Also need new flywheel bolts which are £30 and new clutch bolts are supplied.you may need to change the donut too


I wasn't banking on over £2k for the conversion!you will need to figure for gearbox oil and a master cylender,fluid and you may as well do the Goodrich clutch hose too

Any thoughts on the above prices and possible alternatives would be welcomed from all.its not too bad a job and easier the 2nd time round

Cheers

Dan

God luck a well worth mod

[c_w]

So just to clarify the E46 M3 gearbox can be used and just bolts on?

[Dave P]

So just to clarify the E46 M3 gearbox can be used and just bolts on?

have a read of this

http://www.eatsleeptinker.com/2013/0...-e368-m-coupe/

[M400DPC]

After further thought, I might delay gratification on this particular mod until next year and just get the diff done for starters. Does £450 to rebuild my diff to a 3.91 ratio with 40% like a decent enough deal? If so I might go ahead with what appears to be a fully reconditioned diff....what is lock anyway? And what does 40% offer as opposed to 60% etc...?
Cheers

[M400DPC]

have a read of this

http://www.eatsleeptinker.com/2013/0...-e368-m-coupe/

Cheers by way Dave, really intriguing read

[c_w]

After further thought, I might delay gratification on this particular mod until next year and just get the diff done for starters. Does £450 to rebuild my diff to a 3.91 ratio with 40% like a decent enough deal? If so I might go ahead with what appears to be a fully reconditioned diff....what is lock anyway? And what does 40% offer as opposed to 60% etc...?
Cheers

It's a figure people talk of When I was looking in to this there isn't a clear answer, but it's generally speaking it's how tight the diff is, 100% would be locked for example. The difficult in saying a specific lock is because it's actually variable depending on stuff like the ramp angles, stiffness of the spring washers, number of clutches, tightness of preload etc

I "uprated" my diff last year using a 3 clutch and "dog-ring" pack. In our diffs there is a 4mm thick metal spacer which can be removed and an extra clutch and dog ring fitted in it's place. It feels a bit tighter now, but my diff was an old e30 one so was worn anyway.

£450 sounds about right, they do seem to charge a lot to rebuild these, the tools and expertise to do it properly is beyond most DIY and garages - I would only be happy paying to have it done if they warranted the work though as it won't be until a certain thousand miles later you will be able to tell if it was all put back together with the right clearnces.