Thread: D15B vs D15Z1
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Old 01-30-2012, 09:12 PM   #26 (permalink)
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Join Date: Jan 2012
Location: Denver
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Serenity - '88 Honda Crx Si
90 day: 41.7 mpg (US)
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As I understand it, the vtecE is a little different. Instead of using more gas to get more power it drops to 12 valves instead of 16 and goes into lean burn to use less gas when cruising under 2500 rpm. That is the first stage of the engine. The second is the normal 16 valves and is really no different from any other D15 engine, but the third stage is standard vtec and is exactly what you are saying. More power from a smaller engine by switching the cam shaft profile. At the moment I have hooked up the different profiles to switches I can control manually, but really the lean burn is the part I'm most interested, but I need to have the actual ecu for that. I have noticed a small boost I in fuel economy when I keep the car set to stage 1 without too much loss of power though, so that's cool. As for the third stage, you're right, I'm not terribly interested in it, and I never get the rpms high enough to acutely use it, so I may just opt against it.
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