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.
Pretty much nothing, just maybe a rebuild. All new gaskets, main rod bearings, new rings, etc. With that low boost you'll be fine on stock internals. Also depends what route you choose, supercharger or turbo. Search around for builds and what not.
You'll spend 3-5k turboing it, I guarantee it. I'm over 3k in so far on mine and this is my 2nd one I'm building, so I knew ahead of time what to get and what I was getting into. Plus there is tuning it, which there are no plug and play solutions for. I've been working on fuel and spark maps for the last week, which can add 100's to the cost of the kit if you cannot do it yourself.
The lowen design supercharger kit uses a RRFPR for fuel compensation, no actual tuning is included.
take it from a guy who has had a boosted BMW for 4 years. its costly, and i'm talking about things breaking and maintainace. i'm currently out of commision because i need a new tune on my standalone but i normally run 8lb low boost and 17lb high
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