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Charlie... Welcome to the growing group of 20b NA guys! Great build you have going.
Couple of things. Generally, you should just go with whatever EMS your builder is most comfortable with and ignore most of the flack. However, I would echo most of what RETed said comparing the Tec and Haltech systems. I like the e6k a lot and really liked the ignition flexibility, since I used several different trigger setups (back in the day). I would add that with an NA motor, many of the functions both TEC and Haltech provide are a bit less critical than with the turbo motors. I use a Microtech and it works just fine.
On ignitions. Again, I agree with RETed that CDI is a benefit. CDI only runs generally from 0-3,000 rpm, but the mutliple, stronger sparks burn much better than inductive setups or stock. Plus, if you go MSD, which is my preferred ignition, they (I think) are still the only true digital system and the firing is very precise at high rpm.
On coils. Bigger is better. The MSD Blaster series are reasonably priced on sale especially and do a great job. Output is very high and the rise times are very quick. Since the NA motor will rev to 10,000 rpm if balanced right and with no worries, you need the fastest rise times you can get. MSD's run very cool at high rpms.
Carry on...
Gordon
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1993 Rx7 R1 20b NA
1994 Rx7 20b supercharged project
1991 BMW 850 6 speed
1991 BMW E30 M3 Evo II
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07-17-2009, 05:09 AM
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