Sprint honda miss count in heavy rev

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kesterj
Posts: 26
Joined: Thu Aug 30, 2012 10:46 am

Sprint honda miss count in heavy rev

Postby kesterj » Tue Aug 09, 2016 1:45 am

Ok, i have a Honda B20 motor with a Sprint and it in parallel with the OEM ecu...

When i rev the car lightly i get no misses in the counter.

when i do rev the car heavy, i get miss counts between 1000 to 3500 rpm.

how can i fix this.

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Peterson
Posts: 101
Joined: Mon Aug 17, 2015 2:35 am

Re: Sprint honda miss count in heavy rev

Postby Peterson » Tue Aug 09, 2016 2:56 pm

So the trigger sensor is shared between two ECU.My first thought would be that the signal that haltech receives is weak.if I recall correctly we deal here with VR sensor so if this is correct go at the sensor trigger threshold voltage values and adjust them.For example at 2500rpm you might have 1.5volt output but at the corresponding rpm cell the value could be at 2.5volt.Give it a try and let us know if this helped.

kesterj
Posts: 26
Joined: Thu Aug 30, 2012 10:46 am

Re: Sprint honda miss count in heavy rev

Postby kesterj » Tue Aug 09, 2016 9:58 pm

from before, i had misses even on idle, so i played did play with the filter, i got the best results with home on 3 and trigger in 1.
i then hold the rpm for each value in the " threshold" until the miss count stop. then in would do a light rev, look back at the log, and see if/where the miss was still taken place, play with the numbers there.
so now i have it at a point where,
a: the car would cut off on idle, once it went under 1000 rpm, (had to bring to " threshold" up by .7)
b: on light rev no miss count (had to work the "threshold" table
c: on heavy rev the miss count is now only at 1000 to 3500

note that most of the changes that i have made are for the home channel and to top that i have had to up the voltage (this i found odd).

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HaltechMatthew
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Re: Sprint honda miss count in heavy rev

Postby HaltechMatthew » Thu Aug 18, 2016 2:53 pm

The most common issues I see with B-series distributors are when the trigger and home edges are incorrect. You will need the scope to be certain, but most common is to get the Home polarity backwards.

kesterj
Posts: 26
Joined: Thu Aug 30, 2012 10:46 am

Re: Sprint honda miss count in heavy rev

Postby kesterj » Sat Aug 20, 2016 9:27 pm

oddly that was the very first issue i had... Home polarity...

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HaltechMatthew
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Re: Sprint honda miss count in heavy rev

Postby HaltechMatthew » Tue Aug 23, 2016 2:15 pm

Maybe you have the Trigger polarity also backwards. This is harder to diagnose because the signal from each tooth blend together to form a typical sine wave. You can try it on the opposite edge and re-check the timing.


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