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.
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
__________________ BMW 325IX Black, Build for drift
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.
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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