E30 diffs

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Hello all, 

First of all, lovely looking site, i've been a member before but have forgotten my login and password.

either way, it looks like things have not changed too much.

Just looking for a bit of advice regarding diffs on E30s.

I thought that 

318i had a 3.65:1 in manual form 

and 3.9:1 in auto format. 

i also thought that as the engines got bigger in the range the diff rattings went down. 

I'm asking as there is some question about it for the Miltech e30 challenge.

cheers for you help in advance

James

Edited by jamesgray

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jamesgray Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05-December-2005 Location: kent Status: Offline Points: 1	Topic: E30 diffs Posted: 05-December-2005 at 17:17
	Hello all, First of all, lovely looking site, i've been a member before but have forgotten my login and password. either way, it looks like things have not changed too much. Just looking for a bit of advice regarding diffs on E30s. I thought that 318i had a 3.65:1 in manual form and 3.9:1 in auto format. i also thought that as the engines got bigger in the range the diff rattings went down. I'm asking as there is some question about it for the Miltech e30 challenge. cheers for you help in advance James Edited by jamesgray

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Simon325i sport Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II Joined: 13-November-2003 Location: South Wales Status: Offline Points: 1022	Posted: 06-December-2005 at 10:45
	Generally, yes, the diff ratio does drop with engine size, but some cars had different ratios for the same model. Not sure about 318i auto, but manual should have had 4.45 or 4.27. My 320i touring had a 4.10, late sports had 3.91 LSD, and early sports had 3.64 LSD.


SHEPSM3 Members Profile Send Private Message Find Members Posts Add to Buddy List Bavarian-Board Contributor UK Sport Evolution. Joined: 26-December-2004 Location: Bristol, UK. Status: Offline Points: 1934	Posted: 06-December-2005 at 18:41
	Now Simon, what did the 325ix have? Front and back please?
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b318isp Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Moderator Group Joined: 10-October-2002 Location: Ireland Status: Offline Points: 2057	Posted: 07-December-2005 at 09:42
	The 318is used a 4.10. The 325ix would probably have the same ratio diffs!
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Simon325i sport Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II Joined: 13-November-2003 Location: South Wales Status: Offline Points: 1022	Posted: 07-December-2005 at 16:51
	Hi Paul, not sure about front, but the rear would have varied slightly from normal, it seems there was quite a variation in what ratios were used too, must be for different countries. 325ix saloon could have had 3.91 3.73 or 3.64 and the touring 4.10 or 3.91


Sohlman Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Really Senior Member II Coupe Chairman Joined: 19-August-2003 Location: Surrey Status: Offline Points: 1259	Posted: 18-December-2005 at 18:38
	What is the highest ratio diff i can get for a 325 and what is the top speed it would allow as i am building a track car and getting the right diff is important. Cheers in advance James
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