stalling when cold.
HD EFI Guru
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warming up would work I guess... but takes a while.
Im looking at my 'new' datalogs and it seems a bit of extra accel enrichment is needed.. every time I get on the throttle the O2s go lean for a short period.
how much is too much? it sits at 0.31 in regular operating temps (140C/284F)
man it sucks to make a map created for real gasoline work on this shitty brazilian fuel
Im looking at my 'new' datalogs and it seems a bit of extra accel enrichment is needed.. every time I get on the throttle the O2s go lean for a short period.
how much is too much? it sits at 0.31 in regular operating temps (140C/284F)
man it sucks to make a map created for real gasoline work on this shitty brazilian fuel
Fuel down there typically has a very different Stoich value than what we have state side. The fuel in the USA typically runs around 14.68 Stoich and the fuel in Brazil typically run a Stoich of 14 .28. My guess would be that you VE settings are incorrect in the area you are having trouble in. Set the calibration into Closed Loop for the area you are having trouble with, set to about 0.990 lambda. Then allow the bike to warm up and see if you can gather data in the EXACT same VE cells. My guess will be NO. What you do is raise the idle speed to the value that your trying to hit for cold start, let's say 1250 RPM. allow the bike to run there in Closed loop to gather data and then allow Vtune to trim that cell. Then change your idle speed to a new RPM and do each set point at idle from 750 - 1750 making sure you have good data in each of the RPM set points. Once you finished with it then set the idle back to normal and see how it does the next day.
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Road Captain
Joined: Jun 2008
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From: Lagoa - VNF
Fuel down there typically has a very different Stoich value than what we have state side. The fuel in the USA typically runs around 14.68 Stoich and the fuel in Brazil typically run a Stoich of 14 .28. My guess would be that you VE settings are incorrect in the area you are having trouble in. Set the calibration into Closed Loop for the area you are having trouble with, set to about 0.990 lambda. Then allow the bike to warm up and see if you can gather data in the EXACT same VE cells. My guess will be NO. What you do is raise the idle speed to the value that your trying to hit for cold start, let's say 1250 RPM. allow the bike to run there in Closed loop to gather data and then allow Vtune to trim that cell. Then change your idle speed to a new RPM and do each set point at idle from 750 - 1750 making sure you have good data in each of the RPM set points. Once you finished with it then set the idle back to normal and see how it does the next day.
lambda calibrations help a lot with this tough, on the old ones like my 2008 sportie it was hell to pay
nice trick with the idle speed... will try that! thanks.
ps: on the bright side the ethanol has an insanely high 'latent heat', so that helps a lot in keeping the engine cool (it 'robs' twice as much heat than gasoline when atomized by the injectors), and has a RON of 108... wich allows for a tad hotter timing (just a bit, as it's a 25% mix)
Last edited by b0fh; Dec 2, 2020 at 05:59 AM.
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Road Captain
Joined: Jun 2008
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From: Lagoa - VNF
reporting back... extending the closed loop area fixed the issue, and the bike runs surprisingly well... its now closed loop up to 50kpa under 1500 rpm, then it extends to 55@1750, 60@2000, 65@2250... you get the idea. at 70 it goes open again .
i guess I was tuning it with a 'sportster' mindset, on those if you try close-loop at revs under 2250 you're in for a rodeo
not the case at all with this big beast. its very gentle down to 1500 and even under (but then it loses too much torque).
you live, you learn. cheers.
i guess I was tuning it with a 'sportster' mindset, on those if you try close-loop at revs under 2250 you're in for a rodeo
not the case at all with this big beast. its very gentle down to 1500 and even under (but then it loses too much torque).
you live, you learn. cheers.
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