engine and drivetrain M3 Dog Leg Into 02?

[grahamb]

hi all, 

 

after a 9 year gap, ive just bought another 02 to race, sadly i sold my 02 dogleg and as they arnt exactly common, am pondering trying to use a 265 e30 m3 box.

 

if my memory serves correctly its simply too bulky to fit without major tunnel mods, dont mind doing a bit of panel beating to get it in but dont really want to have to cut the tunnel out and weld a bigger one in

 

can anyone shed any light?

 

thanks in adavance

[TobyB]

If you're going to that amount of trouble,

someone here had figured out how to adapt

the E36 gearbox to the M10.  Good ratios,

and a lot cheaper to obtain.  Similar fit issues, though.

 

I ran an E21 5- speed for a while, with a tall (4.27) diff.

That actually worked pretty well.  Not ideal, but better

than the gaps in a stock 4- speed.

 

Oh, and Ken Blasko has gears for the stock box

that will make it a close ratio.  Probably the most

elegant way to do it...

 

t

[grahamb]

thanks,

 

my old 02 ran a 4.37 with dogleg, never needed first gear though other than driving onto the trailer!

 

i know with  machining its possible to put an e21 small six dogleg internals into the front section of an 02 4 speed, but e21 small six dolglegs are also rare so command 02 dogleg money anyway and have slightly inferior ratios.

 

who is Ken Blasko? that sounds an interesting option

Edited September 8, 2013 by grahamb

[TobyB]

Oh, I meant the generic overdrive E21 transmission from the M10.  Still has the standard ratios, but the

OD tightens up the last shift.  Probably not as common if you're not in the US- it's all we got from 80 to 83.

 

Ken is on this board- he'll probably catch us talking about him and chime in.  He's been actively trying to

upgrade the 2002 to keep it relevant in racing, and the gearset was in development last I heard.

 

t

[grahamb]

thanks, yes i did get that you were talking about an 5 speed od box.

 

i shall be running a 336 cam so close ratios really are needed to keep it on the boil.

[MKINNA]

It only needs another inch in height and massaging on the sides from what I've read from a couple guys that done it on the forum.
I just bought one myself, getting ready to put in soon. I'll be using a M10 bellhousing also on the 265/5 cr

Edited September 11, 2013 by MKINNA

[TobyB]

kbmb02

is the guy you want.  KEENNNNNNN where are YoooOOOoo?

(he just posted a racing video)

 

hee

 

t

[MKINNA]

kbmb02

is the guy you want.  KEENNNNNNN where are YoooOOOoo?

(he just posted a racing video)

 

hee

 

t

 

What ken does is use 245 and swap from a 242 I believe 2nd and 4th while deleting 5th to make cr,they do work quite well

Edited September 11, 2013 by MKINNA

[kbmb02]

The short story, Graham: We combine/modify/customize a Getrag 242 4 speed gearbox to get ratios of 3.0, 1.6, 1.3 and 1.0 (not a whole lot of use for 1st gear other than the paddock, but 2-4 work pretty well). At the 3:10 minute mark of this video, you can hear the shift points clearly: http://www.bmw2002faq.com/topic/144989-race-video-bmws-and-porsches/

 

Best to send message to discuss. -KB

[grahamb]

It only needs another inch in height and massaging on the sides from what I've read from a couple guys that done it on the forum.

I just bought one myself, getting ready to put in soon. I'll be using a M10 bellhousing also on the 265/5 crImageUploadedByTapatalk1378868092.933108.jpg

 

 

hmm thats interesting, massaging i can do. i dont really want to cut the tunnel about, as it will limit where i can race the car, but im now thinking if i can get the whole engine and box sitting lower.............

 

from some perspectives the m3 box is a good move, its very very very strong i ran one behind a turbo motor that had 460lbft of torque for years and it never protested, plus they are newer  and much more common so not to hard to find in the first place or get rebuild parts. downside, they are heavier and have the worst ratios of all the doglegs, and technically are not correct for the bodyshell so again it limits slightly where i can race.

 

kens box sound great, although im not sure with it being a 4 speed so having 3 usable gears  the ratios will be close enough to suit a 9,000 rpm motor, i will get the calculator out.

 

thanks for teh replies guys

[NickVyse]

Hi - you have to cut off the top of the tunnel, add height and spread the sides. But hey, easy as no one has to see how rubbish your welding is, just make it strong. Remember the 265 is also a bit heavier than the other options, but it's also pretty bullet-proof. 

 

[Ian]

As mentioned in an earlier post, there are adapter plates out there that let you use e36 trannies with the m10.  The e36 trannies plentiful and cheap, with desirable ratios, and strong.  I know Ernie Bellos at Bello's Motorsports in West Palm Beach, FL has had some plates made up.

Edited September 11, 2013 by Ian

[02G]

Hi guys noob curiosity.

When you're swapping in an e36 tranny what do you do about the 2002 speedo & odo ?

[M3M3M3]

Delete and use electronic setup.

[TobyB]

is racecar.  no speedo.  Unless Mark Spitz.  Then race in speedo.  

 

t