The e30 L-Jetronic distributor has a fairly mild curve, and retards in the top end which makes the motor feel a bit flatter than it probably should.
From memory (back in my e21 days, which admittedly was 8 years ago now) the trick with the e30 2.3 L-jet used to be either to source an e28 520i distributor or an e21 323i distributor - the e28 distributor had the most aggressive timing, followed by the e21. This woke the engine up nicely, although you had to run 95RON fuel or better to avoid pinging. On normal 91RON, the engine would ping really badly with the e28 distributor.
Note that you need the correct timing settings for each distributor as they were all timed differently, but they're listed in the Haines manual.
From memory (back in my e21 days, which admittedly was 8 years ago now) the trick with the e30 2.3 L-jet used to be either to source an e28 520i distributor or an e21 323i distributor - the e28 distributor had the most aggressive timing, followed by the e21. This woke the engine up nicely, although you had to run 95RON fuel or better to avoid pinging. On normal 91RON, the engine would ping really badly with the e28 distributor.
Note that you need the correct timing settings for each distributor as they were all timed differently, but they're listed in the Haines manual.
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