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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Heard it's popular to do it 5 degrees (advanced, not retarded) on the intake ca, supposedly more torque and slightly higher compression with the catch that it may cause pre detonation. Any word on the validity of this?
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