316i M50B25 6 speed conversion

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bmwe30chic
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Post Sun Jul 21, 2013 9:56 pm

My 316i M50B25 conversion :)
Hello, I have a G reg 316i in Lachssilber Metallic. It's a lovely solid shell with just a few bubbly bits (boot lid, one rear arch and a scab on the sunroof). I've been driving it for about 9 months with the 316 lump and its a slow, tappy old girl... So it was time for change! (316i engine has met the scrap :P). I've never done an engine conversion before and this one comes across simple compared to other options. I'm having the help of my boyfriend (Ex Ford fanatic.. But I soon changed his mind when he got to see the luxury of BMW). I bought a donor car which was a F reg 325i which had the M50 and all the ancillaries necessary for the conversion but it was rusty as sh*t!! So me and the Mr trekked up to Cambridgeshire with the trailer and picked it up.... Driving it to the trailer down the road from the house was fun as it has a welded diff which was an experience! But cutting a long story short it has its problems with the distinct 'bodgeness' of the work done to it... (One tranny mount on the Getrag 260 box, 11 blade fan, the worst attempt at an exhaust ever created, wanky grinded wheel spacers and the heater water pipes were blanked off!!) so I've bought a few goodies such as a 6 speed M3 gearbox, lightened flywheel etc.

I'm going after the sleeper look preferably but with a little eye candy !!! I've left this a bit late as the 325i is stripped and the 316i is empty and in the process of tarting the engine bay, but any things better than none .

The donor 325i moredoor

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M50

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The patient 316i :)

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I've done a lot more since these photo's, so I ought to take some more! But this is all I have for now!
jimbom30cab
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Post Mon Jul 22, 2013 8:19 am

It's is going to be a mega thread :D

Don't suppose you have the m10 manual box still?

Nice work
JF008
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Post Mon Jul 22, 2013 9:44 am

Great project :) I have a lach silber 4 door under going the same conversion, minus the m3 gear box, very nice project !!
ross_jsy
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Post Mon Jul 22, 2013 1:27 pm

Wouldn't have bothered with the 6 speed unit, quite easy to lunch compared to the 5 speed and no massive gains to be had. Looking like a cool project though!
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foxie389
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Post Thu Aug 08, 2013 9:07 pm

Why do you say the 6 speed is easy to lunch when it handles far more torque in the diesels than any m50 or 52 produces.?
DanThe
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Post Thu Aug 08, 2013 9:50 pm

M3 gearbox never went anywhere near a diesel, but I do have an E46 diesel 6 speed box on my E30, its a lot of work and I wouldnt do it again TBH, id just pay the extra for an M3 box and have an easy life :D
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ajay
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Post Thu Aug 08, 2013 10:19 pm

5 speed m3 or 328 manual box is v strong and weighs almost half that of the six speed, the ratio's are v similar. The six speed will give better fuel economy on the motorway but you will need to have a fair speed to avoid it bogging down ( too low road speed in 6th gear will bog the engine down). On standing start a friend tells me 5 speed v 6 speed ( both with same engine) the 6 speed requires more shifts to match the 5 speed, and not to bother with the 6 speed box. Sadly i had already fitted it ! For me the jury is still out, but i have a 5 speed n prop just incase im not happy. (btw 6 speed e46 m3 box)