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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 08-11-2004, 10:53 PM   #1 (permalink)
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ok i have an i head on my e motor so i know that can be done and understand that it drops my compression ratio which is good casue i have a turbo manifold from a 524td and a T3 waitng to tear my face off, bt i know before when i haed the e it was really high compression. SO what i guess im saying is, whats my ratio now and how much boost can i slam into this thing, i was hoping for at least 12 psi daily and maybe 16 or more for autocross or track days. WIll this be possible.


if you could help me with my MSD post too that would be great, i can build an engine but wiring sucks my a$$.
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Old 08-11-2004, 10:55 PM   #2 (permalink)
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actually I thought that the I and the E both had 9.0:1 compression ratios.
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Old 08-11-2004, 10:55 PM   #3 (permalink)
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i know i have 160 to 170 psi compression in each cylinder if that helps, this is just my first turbo project and i realy dont want to blow this motor up, i dont have time to build this one too.
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Old 08-11-2004, 10:57 PM   #4 (permalink)
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not sure abot 9 to 1 but i hope it does, my research is slim but i thought it dropped putting the 2.5 head on my 2.7 motor.
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Old 08-11-2004, 11:33 PM   #5 (permalink)
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I'm pretty sure that the E and the I have 9.0 to 1 compression each. which would say to me - similar head. So you may look into that. I dunno, go to bimmerforums.com and ask them. They seem to reply a little quicker with the technical questions.
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Old 08-11-2004, 11:39 PM   #6 (permalink)
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thanks man
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Old 08-12-2004, 08:33 PM   #7 (permalink)
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Wink

boost at 11 lbs and is f'in sweet, everyone should do this lol, i ran with a 944 turbo today, , but he still won lol either way i am now in love with forced air
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Old 08-13-2004, 08:05 PM   #8 (permalink)
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hey what year was the 944? i almost got one b4 my bmw...it lookd dope
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Old 08-13-2004, 11:14 PM   #9 (permalink)
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i dunno but it had nasty wide body flares for the tires and was real jagged and sharp looking with a pointy nose and quick back, i liked it up untill it beat me lol but its the first time my car has come close to anything like that.
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Old 08-14-2004, 01:23 AM   #10 (permalink)
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The 88 325i's compression is 8.8:1.
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