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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 06-21-2006, 11:41 AM   #1 (permalink)
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advise on upgrading my motor

i have a 85 325e and was wondering if i were to bore out my stock motor, rebuild it, do cams, pully, intake header to a full exhaust, would that also better a better option? and then maybe a turbo or SC?
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Old 06-21-2006, 04:07 PM   #2 (permalink)
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I'm in similar position.

'87 325is 265k miles tired motor not worth rebuilding though.

Going to order a brand new factory fresh BMW 2.5 I motor Monday for $3750

2 year 20K mi waranty.

Two other options Ive considered was a super eta motor which is suposed to be hot, but hard to find/build.

Ive head people sugested replacing eta motor with i motor. Not the super eta but I'm not totally sure of the diferences. bore stroke, displacement.
There a good post on that topic here somewhere. I think in FAQ's section.

Also a newer model used M3 motor and conversion kit which may be cheaper, but I hate using conversion kits and someone elses used motor.
But ive heard like $2500 on ebay.

Anyway I have till MOnday to change my mind.

I'd definetly like to hear more feedback on this topic as well.

I'd like to know if theres a good SC for this motor. I hear more about good turbo system than blowers.
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Old 06-21-2006, 09:17 PM   #3 (permalink)
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SC? BAHN BRENNER! Great performance gains... Expensive though!
Have fun with it!
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Old 06-21-2006, 11:10 PM   #4 (permalink)
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An ETA with a 88 and later i head would create a near ideal compression ratio for turbocharged fun...

If you want N/A induction an 88 and newer i head have much larger valves, with the addition of the 88 and up pistons with your 2.7's stroke. Top it off with a chipped DME, with headers and larger injectors and it's burn out time!
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