Reading plugs to tune WOT
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Joined: Dec 1999
Posts: 2,248
From: Houston, TX
Originally posted by rskrause
Ryan: obviously, the injectors can't be open more than 100% of the time. But if the PCM is commanding a >100% duty cycle, there's a problem. You can't even tell if the injectors are appropriately sized, because most injectors will not operate reliably at >80-85% duty cycle. This is not just "urban legend". I have seen it, many times. You need to get the duty cycle down to the 80% range and see if it's rich or lean. If it's rich, back off the PE v. load v. rpm. If lean you can either raise the fuel pressure or go to larger injectors.
Rich Krause
Ryan: obviously, the injectors can't be open more than 100% of the time. But if the PCM is commanding a >100% duty cycle, there's a problem. You can't even tell if the injectors are appropriately sized, because most injectors will not operate reliably at >80-85% duty cycle. This is not just "urban legend". I have seen it, many times. You need to get the duty cycle down to the 80% range and see if it's rich or lean. If it's rich, back off the PE v. load v. rpm. If lean you can either raise the fuel pressure or go to larger injectors.
Rich Krause
Ryan
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Joined: Dec 1969
Posts: 10,745
From: Buffalo, New York
Originally posted by 96-speed
Hey Rich. I sent you an email last night that had some baseline times/mph and some info. Did you receive it?
Ryan
Hey Rich. I sent you an email last night that had some baseline times/mph and some info. Did you receive it?
Ryan
Rich Krause
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Jul 16, 2002 07:48 PM