2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Max ECU controlled duty cycle on stock computer

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Old Aug 6, 2001 | 10:44 PM
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mazdaspeed7's Avatar
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Max ECU controlled duty cycle on stock computer

What is the Maximum ECU controlled duty cycle on the stock ECU?
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Old Aug 6, 2001 | 11:55 PM
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Chris Ng's Avatar
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From: Calgary, AB, Canada
there is no max persay...
the ECU can run your injectors all the way to 100% duty with enough boost or fuel correction with a fuel computer..
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Old Aug 7, 2001 | 12:26 AM
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mad scientist
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From: Savannah, GA
My car is a n/a with a lot of mods. I was wondering if there is a point on the srock ECU that no matter what kind imputs the comp gets telling it that it needs more, it won't increase the duty cycle past that.
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Old Aug 7, 2001 | 12:35 AM
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Thanx for this post i have been waiting for the same question and answer for so long..
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Old Aug 7, 2001 | 03:01 AM
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rotary performance says the stock n/a ecu only runs between 59%-63% duty cycle on the injectors, kinda low, but the injectors last long i think they say 85% is where they get unreliable
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