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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Olympic 914 |
Aug 15 2017, 06:05 AM
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#2
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Group: Members Posts: 1,675 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
Did you ever find out any more about this ?
I am also seeing rich AFR numbers on over run, same as yours 10-11 Mine is a 2056 with djet and seems to be similar to your build. running a 043 MPS with initial settings at the 037 specs since I have a 037 ECU, but it was much too lean at those settings. Now I am in the neighborhood of 13.5 - 14.0 at a 3000 rpm cruise but going down hills on over run it goes to the 10.0 - 11.00 range. I did set the throttle switch originally and reset it when I had the throttle body off for another issue. haven't checked the mileage yet and only have about 400 miles on the rebuild engine. |
Frank S |
Sep 27 2018, 10:03 AM
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#3
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Member Group: Members Posts: 135 Joined: 15-April 15 From: Wiesbaden, Germany Member No.: 18,632 Region Association: Germany |
Did you ever find out any more about this ? I am also seeing rich AFR numbers on over run, same as yours 10-11 Mine is a 2056 with djet and seems to be similar to your build. running a 043 MPS with initial settings at the 037 specs since I have a 037 ECU, but it was much too lean at those settings. Now I am in the neighborhood of 13.5 - 14.0 at a 3000 rpm cruise but going down hills on over run it goes to the 10.0 - 11.00 range. I did set the throttle switch originally and reset it when I had the throttle body off for another issue. haven't checked the mileage yet and only have about 400 miles on the rebuild engine. Did you ever fix the problem with rich AFR on over run? I'm running the same engine specs and had the same problem. Car idles great but due to the needed MPS adjustments it idles rich 11,8 AFR, this is also resulting rich condition below 2600-2800 RPM 12,3 - 12,7 AFR all range above 2800 RPM is perfect. I was able to improve the rich situation by adding and adjusting (Opening at 15,5 Hg) a Decel Valve. This improves drivability in low RPM range and also improves the rich overrun situation. Cheers, Frank |
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