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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 04-12-2004, 04:32 PM   #1 (permalink)
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Hi
In two week i will put a 325i 90 engine on my 325es 86 body. After this engine swap, what is the better upgrade i have to do for have more accelaration power (i dont do top speed, i'm from quebec and the road are very scrap so, acceleration is the fun way :-)
So, does is better to buy a headers set i change my cam or change the differentiels?
What size of differentials is better to buy?
Did you have good suggestion where to buy? I have seach headers on ebay and for E30 it are very hard to find it. the best price i have find is on this web site:
https://secure7.nexternal.com/shared/StoreF...sp&CategoryID=3
Note: i dont whant to paid more that 700us$, and if some body know can i find use part just said it :-). I know that chips do big upgrade but i does'nt trust that for the moment, i prefere do old school modification


Thx a lot for your suggestion
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Old 04-12-2004, 06:55 PM   #2 (permalink)
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I think the 3.25 manual 325is differential is the better one for accelertion.
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Old 04-12-2004, 09:39 PM   #3 (permalink)
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4.10 is the way to go. The greater the ratio is the quicker your car will accelerate. The 3.25 is good for top speed, not acceleration.
'87 325is has a 3.75 lsd, and the E30 M3 has a 4.10, not much diference but enough for th M3 to leave the 325is almost 0.5 seconds behind. If you put the same diferential on ths 325is and a chip to bring the revs up to match the M3, then M3 will be left behind, if not berely matching the 325is.
Given the same power, rpm and weight ratio a 4.10 LSD will give you acceleration quicker than 3.75 and even more than 3.25.
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Old 04-12-2004, 09:48 PM   #4 (permalink)
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Definitly I think 4.10 is the way to go for acceleration.
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Old 04-12-2004, 10:07 PM   #5 (permalink)
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why do you want headers for a stock engine?
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Old 04-13-2004, 10:26 AM   #6 (permalink)
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Does is just the M3 that have 4.10:1 ratio or Z3, 328 or oder bmw have it? If yes, what can fit on my car? (M3 are very hard to find at quebec)

For the headers, i think that if i put a performance cam on my engine i need a headers for better performance.

thx for your help
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Old 04-14-2004, 04:45 AM   #7 (permalink)
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I'm guessing you don't care about gas mileage
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Old 04-14-2004, 11:44 AM   #8 (permalink)
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Umm if we whant power...we have to paid the gaz....
Witch car have a 4.10:1 differential ratio other that M3?

Does i change all the differentials or juste the rear gear and seal?

Thx
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Old 04-14-2004, 03:26 PM   #9 (permalink)
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you just replace the differential as a unit, which isnt complicated since its just a big case your dealing with. Automatic E30 325i/is/iC came with 4.10 diffs, but not all had LS since it was a option. the 325iX had a 4.10 LSD but it uses viscous coupling which ive heard isnt very helpful for performance on a RWD car but it may still work. the later 318i/is/iC had optional 4.10 LSD's, but used a small case diff which would not work on a 6cyl car
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Old 04-14-2004, 11:20 PM   #10 (permalink)
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Indeed, as MrM3 has stated, a 4.10 is the diferential on most if not all automatic E30 came with. About that not all had LS since it was a option, I'm glad to have learned it today. Thanks MrM3!
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Old 04-15-2004, 10:44 AM   #11 (permalink)
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Oki Thx, i will seach a automatic differential it will be more easy, else i will put de 3.73:1.
Did you have a web page that explain all step to do to change this part?

Thx
Alex
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Old 04-21-2004, 09:23 AM   #12 (permalink)
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I own a 1988 318i Auto running on a 4.1 diff.

I am thinking of getting a 4.1 LSD.

Can I get a 4.1 LSD off any E30 or must it have come from a 318i Auto like mine.

By the way how much would it cost?

Thanks.
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Old 04-21-2004, 10:41 AM   #13 (permalink)
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4.1 Differential E30

I own a 1988 318i M40 auto( not sold in US).(RHD)

I want to buy a 4.1 diff(non LSD) from a 1991 318i M42.(LHD)

My question is will it fit?

Thanks.

By the way how much would a 4.1 LSD cost?
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Old 04-24-2004, 09:51 AM   #14 (permalink)
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I'm not sure, i seaching the same information (525 diff.)
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Old 04-28-2004, 05:59 AM   #15 (permalink)
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