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E30 M3 European Close-Ratio Transmission
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A comparison of the gear ratios of the euro-spec close ratio tranny
to the ratios on the U.S. spec "economy" gearbox.
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1987 E30 M3 Gruppe A Racecar Technical Highlights
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Here are some photos provided by Arthur Porter of his 1987 Gr A
racecar (just before he sold it). As usual, the technical details
are fun to examine.
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Leverage Ratios on an E30 Rear Trailing Arm
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The included photo allows one to measure the various E30 rear trailing arm
leverage ratios to first order. Converting to true coil over's with the springs
over the shocks? Wondering what spring rates to run? This page should get you
started...
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Gr A Rear Trailing Arm Reinforcement
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The BMW Motorsport Gr A trailing arms were reinforced in a similar manner
to the newer M Roadster/M Coupe. However, the reason for the reinforcement
is interesting.
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E30 Rear Roll Center
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Learn how to determine the location of the roll center on an E30
semi-trailing arm rear suspension. Also examine how changing the geometry
of the trailing arm pickup points affects the roll center location.
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Big Valve Dyno Comparison
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Ever wonder how a big valve head would compare to a standard ported head?
On an otherwise identical engine? Well, go here to find out...
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E30 Semi-Trailing Arm Camber & Toe
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Have you ever wondered how the camber and toe change on the E30 rear semi-trailing arm
suspension? Well, this article provides the answer. Includes curves of camber and toe
vs. rear wheel position.
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Koni SA Shock Dyno Results
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How does the popular Koni single adjustable shock for the E30 M3 really behave
in compression and rebound? These shock dyno charts tell the story...
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