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Maps and what's in them

P

PP-1753

Guest
Hi Everyone,

Being a tech head from way back I need to understand (from all you gurus) one thing. Our CARC (5AM) ECUs have one or two Lambdas fitted. What would be the effect of disabling the Lambda (in my case I only have one) in a map?

I will have other questions as I get to explore more of the map.\\Thanks in advance and I apologise in advance for setting things on fire... :sick:
 
My Griso has the Lambda disabled as well as a modified map by Todd. The lambda disable allows me to use a PCV with Autotune (and the wide band lambda sensor that goes with it) to correct the fueling to my desired targets (I can have different target ratios for different rpms/throttle positions) as opposed to the original set up which used a narrow band lambda sensor to adjust fueling to about 14.7:1 whenever it was in closed loop mode, which is a little too lean for good running.
Disabling the lambda and not using a PCV/Autotune and not adjusting the fueling would likely result in a motor that does not run quite right but it would be something of a crap shoot as to how bad or good it ran. It would simply be running an open loop, fixed map and how well that map suited your bike, the fuel you use, and the riding you do, would be a hit or miss thing. Todd may have additional insight on this.
 
Disable the lambda, take it for a spin. There is a fuel trim value, which is not relevant until you disable the lambdas but once you do, it has an effect. Start increasing the Trim little by little, say 3 or 5 at a time, and ride again. There isn't any way to get precise with this without doing some measurements on a gas analyzer, so seat of the pants feel, popping (or lack thereof) on deceleration, and the amount of engine braking are your reference points. Set it to your liking.

Chances are high that with the lambda disabled and trim value set somewhere on the positive side, you will have a much better running bike than stock. It could be also that your particular bike might need a lowered trim value instead, though that is less likely.
 
Having got IAW5 Reader and Writer and TunerPro to work now, I disabled the O2 sensor in TunerPro and wrote the file pack to the bike (having saved the original file of course).
The low speed running of the bike was definitely improved but it seemed to me that the fuel consumption was very poor, so, for the moment I restored the O2 sensor to operation.
Fuel consumption is back to normal as is the snatchiness.
 
turning off the sensor will be an improvement in the lower part of the fueling, if you have acess to an exhaust gas analyzer set the co trim to give about 3-4% co, you need to also need to go to the actors and clear the old codes.
 
I have on occasion I have tried to reinvent the simple wheel, on ECU MAPS Todd has balanced and trued the wheel! Send him you ECU, and he sends you a MAP installed in the ECU that you know will not toast the engine and it works great! Money very well spent!
 
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