Nightrider Technical Notes

HD CE Codes

Posted by Administrator on 10/3/2013 to HD Tech Notes
If you need to look at ECM Codes, here is a quick way to view them on your Harley Speedometer.

2007 and Later Harley-Davidson Engine Performance

Posted by Stephen P Mullen on 10/1/2009 to HD Tech Notes
There is more independent proof that you do not need to remap the HD EFI when installing mufflers. The March 2009 (page 66) Cycle World dyno tested a set of slip-on mufflers on an '09 FLH, getting 5% more HP and 9% more torque on a "bone-stock, including EFI mapping" bike.

131/151 Explained

Posted by Stephen P Mullen on 10/1/2009 to HD Tech Notes

What do the 131/151 codes mean?
The codes are specifically listed as P0131 and P0151 codes. The description in the Service Manual is:
P0131    Front O2 sensor low or engine running lean
P0151    Rear O2 sensor low or engine running lean
The key point to look at here is "O2 sensor low" when analyzing what is happening with the XIED's in place.

FAQ

Posted by Administrator on 10/1/2009 to HD Tech Notes
FAQ for Nightrider XiED products

Nightrider closed loop ECM products

Posted by Stephen P Mullen on 1/1/2008 to HD Tech Notes
Nightrider has developed a variety of products that make alterations to the closed loop fuel mixture of the 2007 later H-D Delphi ECM. We often get questions about the differences in the products, if the product is compatible with their upgrades or which product is “best” for their particular bike. These tables were created to answer some of your questions.

2007 HD High Heat Behavior

Posted by Stephen P Mullen on 1/1/2007 to HD Tech Notes
This was our original analysis of the HD closed loop ECM done in early 2007. While we have learned a great deal since then, much has changed, some of terminology was less than ideal and even a few of our conclusions were not quite correct, but our analysis of the heat and how richening the mixture can dramatically cool the engine was indeed correct.

2007 and Later HD Performance Upgrades

Posted by SP Mullen on 1/1/2007 to HD Tech Notes
The number of 2007-later performance engines is increasing. But Nightrider.com still recommends staying with fairly conservative upgrades.
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