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Old 12-20-2011, 07:06 PM   #26
roger 04 rt OP
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Joined: Nov 2011
Location: Massachusetts
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Originally Posted by ROHrider View Post
Sounds like you've made a real improvement! Great work but it does seem like a lot of work. Why didn't you just install something like the Rhine West performance chip? Look forward to your reply.
Thank you. The design and testing has taken some effort.

I see two choices for solving the "lean burn" Closed Loop weakness.

1) Take out the O2 sensor and go Open Loop all the time. Or rechip or Powercommander or some other way to stay open loop.

2) Put in an O2 sensor that can be reprogrammed to a different switching value than Lambda=1.

I wanted to keep the Cat Converter and the standard Motronic so the choice was #2.

It was a lot of work to figure it out. I don't think it will be a lot of work to implement a second time. My next efforts will be to determine the minimum change that will produce the desired results, and some fine tuning of the LC-1 parameters.

My conclusion is that the Boxer engine in the R1150 was not really designed to operate with a 14.7:1 mixture (lambda=1). So my two fixes:

1) A BoosterPlug to correct Open Loop for E10 fuel.
2) A programmable Wideband O2 Closed Loop sensor to richen Closed Loop operation.


roger 04 rt screwed with this post 12-20-2011 at 07:24 PM
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