ECU Flash

MattR

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If you left the fuel alone, what did you do to get the gains? Did you change ignition maps? Have you got a graph you can post?


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MattR

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Mines a 2017 and Chris said later ECUs throw up more faults if the lambdas are switched off. So he leaves them on but adjusts the levels so that they never activate.


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MattR

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If you have a 2017 bike with an Arrow full system you can post your ECU to CJS and he will flash it with the map he developed on my bike on the Dyno.


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tallpaul

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Mines a 2016 with a full arrow system. It was mapped a while ago. It makes a huge improvement to the general rideability of the bike. I still have some engine braking but it just isn't as harsh as it was. No idea on more power as it had plenty to start with, but my overriding thought is that it is way smoother to ride now. Far and away the best mod I've ever paid for.
 

MattR

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Agreed. The main improvement is the smooth way it delivers grunt from low down revs. Ideal for pulling out of sharp corners and overtaking. The increase in BHP is not really noticeable.


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Kruzzin5

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Newmarket, Ontario
Here are the results. For some reason, they gave me the 2ND dyno run vs the 1ST run as a comparison to the final results. The opening numbers were...91.81 hp, 73.26 ft/lbs....for a 6hp increase over stock. Ignore the date of test from 2005.


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Super Tenere ECU flash Dyno 10.2.2020201003.jpg
 

Kruzzin5

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If you have a 2017 bike with an Arrow full system you can post your ECU to CJS and he will flash it with the map he developed on my bike on the Dyno.


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Yes, I forgot to mention, the owner of the dyno shop had a 2012 S10 with complete Arrow header/pipe, to which he let me take out for a run. "91 hp", however it felt much more powerful. His bike is an absolute rocket! I said if he could flash mine that well, I would be very happy!

I am hoping to test my bike more thoroughly today.
 

twinrider

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I hear you on this point BUT....isnt flashing your ECU essentially disagreeing with Yamaha R&D? If Yamaha knows best then why flash or modify?
Yamaha has to pass emissions requirements worldwide, they map the ECU first and foremost for this requirement, not for optimal performance.
 

twinrider

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If you have a 2017 bike with an Arrow full system you can post your ECU to CJS and he will flash it with the map he developed on my bike on the Dyno.


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He sold me a map for a customer's stock Gen II that worked great on my 2015. Sent it to a local shop he knows in Japan and they uploaded it for me. Works great, both stock and with a full aftermarket exhaust.
 

BLW

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I dont get the whole disconnecting the "Lambdas" thing, they are what tells the ecu how well it is fueling, right? If you remapped the fuel and ignition curves the lambdas should keep the fuel to that new map, without them how does the bike adjust for changing altitudes and temperatures. Every automotive fuel injection system I know of uses O2 sensors to check it self after the combustion process, are bikes that much different?:confused:
 

Kruzzin5

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I dont get the whole disconnecting the "Lambdas" thing, they are what tells the ecu how well it is fueling, right? If you remapped the fuel and ignition curves the lambdas should keep the fuel to that new map, without them how does the bike adjust for changing altitudes and temperatures. Every automotive fuel injection system I know of uses O2 sensors to check it self after the combustion process, are bikes that much different?:confused:
Agreed. I kept the sensors functioning.
 

twinrider

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I dont get the whole disconnecting the "Lambdas" thing, they are what tells the ecu how well it is fueling, right? If you remapped the fuel and ignition curves the lambdas should keep the fuel to that new map, without them how does the bike adjust for changing altitudes and temperatures. Every automotive fuel injection system I know of uses O2 sensors to check it self after the combustion process, are bikes that much different?:confused:
AFAIK the 02 sensors give feedback to help keep the fueling in an epa-friendly range.
 

BLW

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I could be wrong , but I believe that the Lambda/O2 sensor is just an input for the computer / ecu. It gives the ecu info and then the ecu decides what to do,the sensor doesnt know what epa compliance is, the computer does. So, if I reflash my ecu to run at the perfect fuel mixture( not too rich , not too lean, I actually like a little on the rich side so the engine will run cooler) the ecu will use the info from O2 to keep it in that newly set range and it wont care about the epa. If I disconnect my O2 sensors and just tell the the ecu to run off of a fixed map, then I may as well run carburetors and save myself all the complexity and expense of fuel injection.
 

MattR

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If you leave the lambdas working they will fight against the new map in the lower ranges. Lambdas are the compromise for engines that haven’t had the benefit of a Dyno tuned map.


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jbrown

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Novato, CA
The O2 sensor feedback only applies in closed loop engine operation. That includes idle, light acceleration, steady speed cruise, and deceleration. High throttle acceleration moves you out of closed loop operation. So you can re-map for higher output at high throttle situations, and still have the O2 sensors active.
There could be some long term and short term calculated fueling offsets that are applied to the fuel map values, even in open loop, but I don't know if the S10 software does that. It likely just goes straight to the map values in open loop.
 

MattR

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However, it is the low rev ranges where the emission maps run far too lean and need to have fuel added. Exactly the area where the lambdas function to try to lean up the map again! Ideally the air/fuel ratio should be between 12.5 and 13.5 at all times. When we did the baseline run before flashing my bike the lower rev areas were reading 15 a 16 and at one point were off the chart too lean. If you look at my graph you can see that in most areas now the A/F is within the 12.5 to 13.5 parameter. If the lambdas were still functioning they would be trying to lean out the AF outside the parameters again because that’s what the emissions rules dictate.


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BLW

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If the lambdas were still functioning they would be trying to lean out the AF outside the parameters again because that’s what the emissions rules dictate.'

So I am not properly understanding the reflash concept, to me it should rewrite the ignition curve and the fuel injection mapping ( and a bunch of other things)and the lambda would then try to keep the emissions output in the new parameters, I wouldnt think the lambdas could adjust outside the new parameters unless the ecu has an emissions program that cant be overwritten.:oops:
 
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