What's your A/F on Overrun?, 'Nother D-Jet A/F Question |
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What's your A/F on Overrun?, 'Nother D-Jet A/F Question |
BeatNavy |
Mar 12 2017, 12:28 PM
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#1
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
For those with D-Jet, what are you typically seeing for A/F ratio on a medium to hard overrun? Based on what I've read here mine seems too rich - like in 10's and 11's. Once the RPM's drop closer to idle it bounces back up to normal idle A/F ratios. Does A/F on overrun even matter?
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cgnj |
Sep 27 2018, 03:18 PM
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#2
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Senior Member Group: Members Posts: 623 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None |
Hi,
just saw this. A while ago I had a PM exchange with Brad Anders regarding the differences between each of the DJet ECUs. This is a para phrase of what he explained to me, rgarding overrun cutoff and the 4 and 5 waveform generators. Overrun cutoff ended up being a mixed bag with regard to emissions. Apparently, it doesn't work that well, something with regard to engine cooling. In the early '70's, before the 3-way catalytic converter became available, manufacturers were trying anything and everything to meet the new CO, HC, and NOx standards. Perhaps he will chime in here. Carlos |
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