ECU Flash

[MattR]

Yamaha don’t seem to want the motor to run at 105c. Hence the thermostat opens at about 75c. The only time the fan comes on on my bike in the uk is when I’m stood in traffic.


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[BLW]

I suck at metric conversions , so I will just give you my american numbers , my fan comes on at 220 degrees , i believe. When I am off road under 30 mph it will run over 200 alot, I have already installed a switch that bypasses the fan relay and I turn it on whenever the temp gets over 190.There is alot of room in front of the engine , I could see putting a radiator in there and 2 fans. It would take a fair amount of fabrication but it would have to work better than a sideways mounted radiator.

 

[MattR]

Or you could have the ecu flashed so that the fan comes on at 200? No switch required.


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[BLW]

Your right ,but then I couldn't say I did it.

 

[twinrider]

Can't nuke this post, so here's cat riding a motorcycle.

 

[MattR]

Chris at CJS says the stock headers are actually very good and if you remove the cat they are as good as the Arrow headers. Around 100bhp is normal for a flashed S10 and he’s only ever seen 1 higher than that at 101bhp.


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[twinrider]

Chris at CJS says the stock headers are actually very good and if you remove the cat they are as good as the Arrow headers. Around 100bhp is normal for a flashed S10 and he’s only ever seen 1 higher than that at 101bhp.


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Good to know. I like to keep my stock exhaust intact for if/when I sell the bike.

 

[Longdog Cymru]

Hi Matt, thanks for the reports and photos. The fuel cut off on closed throttle is the main reason that throttles on fuel injected bikes are snatchy. The fuel in the inlet tract evaporates and when you open the throttle, nothing happens for an instant and when it does......! It doesn’t happen in cars because the rotating engine mass is greater and dampens the effect.

Your reports have left me wondering where I can get a cat-bypass pipe from!

Mike

 

[MattR]

Mike, am I right in thinking that switching off the fuel cut reduces engine braking, or are the two unrelated?


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[WJBertrand]

Mike, am I right in thinking that switching off the fuel cut reduces engine braking, or are the two unrelated?

My sense is that the engine braking has more to do with the throttle position/map under deceleration. The fuel cut probably has some effect, especially if the throttles are not closed as tightly after a remap. Mostly I think the fuel cut exacerbates jerky the off/on/off throttle action.

 

[MattR]

My sense is that the engine braking has more to do with the throttle position/map under deceleration. The fuel cut probably has some effect, especially if the throttles are not closed as tightly after a remap. Mostly I think the fuel cut exacerbates jerky the off/on/off throttle action.

That makes sense. I’ve heard people have added fuel to the fuel map to reduce engine braking which would only affect the A/F ratio but adding it to the throttle map would have the desired effect


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[Ronzo]

I specifically asked him about those two items, as he left his alone. Said the same thing as some of us here on the forum. Yamaha spends a fortune on R and D. If they wanted the thermostat to come on at a lower setting, they would’ve programmed it that way. As for engine braking, we both agreed that it’s a good thing to have. All my bikes other than one, have been a Twin. I really like engine braking and don’t want to lose it. I also asked if he could program to run on regular fuel versus premium, as there’s almost a $5 per tank saving. He was strongly against that for a number of reasons which makes sense. Didn’t realize how much of a benefit using premium is on our bikes.

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?
Kinda like the premium fuel argument.
If Yamaha R&D knows best why change that to save up to $5 a tank?
I had 2 FZ1s.
The first was a stock 2006 second gen. No mods.
The second was a flashed and fully farkled 2012.
Other than looks, those were two completely different bikes!
2012 was so much better to ride. Night and day!!!
Gonna have to think on this one.
How was the ride home? Eager to hear your thoughts.

 

[MattR]

My assessment is that Yamaha program each ecu with exactly the same maps. Every engine is slightly different so even without the emissions hurdles that they have to jump over the generic maps would not get the best performance from each engine. Now factor in the emissions and we all end up with a generic map that is very lean in the lower rev band and not at all what Yamaha originally designed the engine to run with.


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[Cantab]

That makes sense. I’ve heard people have added fuel to the fuel map to reduce engine braking which would only affect the A/F ratio but adding it to the throttle map would have the desired effect


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About the engine braking / abrupt throttle i cant understand why Yamaha have made it this harsh ? To me this cant be to nice on the whole driveline...imagine if it was chain & sprockets they'd be wrecked in no time.

 

[fac191]

It's not Yamaha that's in control it's emmissions regs. My engine is tuned to pass tests. Especially one at around 3500rpm. If it didn't have to comply it would run to its optimal potential.

 

[Cantab]

It's not Yamaha that's in control it's emmissions regs. My engine is tuned to pass tests. Especially one at around 3500rpm. If it didn't have to comply it would run to its optimal potential.

I think that rpm range used for noise as well

 

[Longdog Cymru]

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?

I agree with what you are saying, the only caveat is that Yamaha and every other manufacturer‘s hands are tied by emission controls. They can build any motor they want to, BUT, it has to comply with emission controls for the markets it is sold in. Correct me if I am wrong, but California, for example has different emission laws than many other places, and so it goes, the manufacturers are walking a tightrope to produce motors nowadays.

 

[Mdurf]

The main thing I am after is the lower gear performance and the gas mileage. I am planning a motorcycle/gold prospecting trip to the Yukon and Alaska in 2022 and want the best performance from the Tenere.

 

[MattR]

The main thing I am after is the lower gear performance and the gas mileage. I am planning a motorcycle/gold prospecting trip to the Yukon and Alaska in 2022 and want the best performance from the Tenere.

As I found out, my flash had resulted in vastly improved low and mid range power but I suspect that because the stock map was so lean and the tuner had to add so much fuel to get the ratio right, that I will get slightly worse mpg. My other bike was too lean low down but too rich higher up so when it was tuned the mpg stayed the same.


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[Kruzzin5]

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?
Kinda like the premium fuel argument.
If Yamaha R&D knows best why change that to save up to $5 a tank?
I had 2 FZ1s.
The first was a stock 2006 second gen. No mods.
The second was a flashed and fully farkled 2012.
Other than looks, those were two completely different bikes!
2012 was so much better to ride. Night and day!!!
Gonna have to think on this one.
How was the ride home? Eager to hear your thoughts.

The ride home was awesome! Stock horsepower was 91, after the flash 97. Torque went from 74 to 77 foot pounds. I left the fuel alone, it still runs on premium. Fan temperature setting was left stock as well. The bike is much more smoother and responsive throughout the RPM range, especially low to mid range. I really have to hang on when pinning the throttle. LOL I have the stock header pipe which has been decatted, and welded back together. They did notice a bit of a hiccup because of exhaust accumulating in the cat housing, before exiting the exhaust pipe. They recommended I get an arrow header for further improvement.