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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 06-19-2005, 04:52 AM   #1 (permalink)
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I just bought this from a friend for 1500
160000 miles
1990 bmw 325i
It has an H&R suspension kit, exhaust, 3" clearance, Performance chip and 190hp.
I just sold my 2001 corolla s and i have $7000 left.

My friend recommended that I get the engine bored to a 3.3 liter and get a supercharger. I was also considering getting new headers, cams, coney yellow shocks, and raising the car up half an inch. I might also want to get an M3 transmission off ebay, because when i drop from 4th to 3rd i have to double clutch and match my rpm to the speed of the car. I think the transmission is starting to go bad.

I don't really know all that much about cars, so if you guys could give me some suggestions it would be greatly apprecaited.
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Old 06-19-2005, 02:30 PM   #2 (permalink)
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you cant bore the m20b25 to 3.3L.

the max you can overbore the engine is .5mm recommended by bmw at least.. biggest conversion kit ive ever seen is 3.0L stroker kit which uses a modified s50 crank and custom pistons. Ive heard of people getting to 3.1L using m40 or m42 pistons but its just heresay and no one has yet to do it.

you arent going to be able to stroker and supercharge your engine for 7k unless you do all the labor yourself. its probably going to be one, or the other.

considering it has performance mods it was probably driven hard.. might as well go stroker since that way you at least know you basically have a new motor in the vehicle.
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Old 06-19-2005, 07:57 PM   #3 (permalink)
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Might want to take care of all the maintenance stuff first especially the timing belt,
then plan out the performance mods.
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Old 06-22-2005, 12:56 PM   #4 (permalink)
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Ill have a shop look at it to see if the engine can be bored to a 3L. Do they even make superchargers for the e30?

Any idea of how much it will cost to bore the engine out?

Thanks for the help!
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Old 06-22-2005, 06:36 PM   #5 (permalink)
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Welcome to the forums,

like nukeduster said, it isnt recommended that you overbore more than .5mm (which would result in about a .5L increase, i think), but 3.0L is achieveable with a modified s50 crank from ireland engineering. i think you should do more research to decide if you even want to stick with the m20
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Old 06-22-2005, 06:38 PM   #6 (permalink)
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Korman, Metric Mechanic and Ireland Engineering offer 2.8, 2.9, 3.0 stroker setups for the e30.
The m20 motor responds better to a turbo setup although SEAMBMW has an eaton supercharger project car in the works.
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