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Old 10-30-2012, 02:14 PM   #5
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,829
ICU's are not all the same. The torquoise ICU's from BMW can take lower coil primary resistance. Tha'ts the main spec to deal with regarding ICU's which I can't ascertain from those specs. The rev limit is too low as well if it matters? Run the same primary resistance as what the ICU was originally run with or a little higher but never lower. That will fry the ICU. Too high Primary resistance can weaken high rpm spark from what I have read although I haven't found this out for myself. I HAVE found out about matching ICU's to too low primary resistance myself!

I am running two .7 ohm dyna's on my dual plugged stock bean can with the weight stops bent in to restrict full advance. It is running good!
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