yamaha r1 idle stability and tuning

[cra5hdown]

hello everyone, im in the process of stabilizing my idle on my 2003 r1. i have it idling at .9 lambda and it fluctuates between 1100 and 1300rpm. i would like it to idle at 1150 but i cant seem to stabilize it. it does not sound like it is hunting im just trying to get it to closer to the 1150 mark. i included my log files and map. thanks for any help.

[sphilips]

Have a look at you ignition table. I think you should smooth them between 1100 and 1500 rpm at 0% throttle.

[cra5hdown]

thanks for the response, i had them from 800-1500 i had them set at 10 and it did not make a difference. it was still moving around a lot.

[JulianEdgar]

No idle speed control valve?

[cra5hdown]

No , it does not have an idle control valve. Just a knob that adjusts the butterfly in the throttle bodies.

[sphilips]

Try this
1000rpm 9
1500 rpm 8
2000 rpm 8

Or something like that, more advance just below the idle rpm. But if you have to much of a difference it will start hunting.

[Scott@FP]

Ign timing is jumping around a lot. This isn't helping. Your Load calc is set to TP so either the TPS is needing filtering or there is too much change between cells.

EDIT: After zooming in, your RPM trace is leaving a sharp toothed pattern, something is causing the RPM to be calculated like this, and its probably the root cause, as the timing and fueling follows it.

You might want to consider reducing IJPU from 17 to something that will get your fuel table numbers up and give more resolution, like 4 or 6 or so. Fuel table values will go up to 400.0.

On engines it is difficult to get idling as a quick and dirty idle stabilizer you can change the ign table breakpoints to a very small step in the desired idle area, say 1000, 1100, 1150, 1200, 1500 RPM and 0% 1% 2% load, then use this to keep it at idle by putting a 'wall' up above the desired idle point, 1000, timing 15 1150 RPM timing 5, 1200 RPM timing -5, 1500 normal timing all at 0% Load, then revert to normal timing by 2%.

[cra5hdown]

thanks for the replies guys. i will try that with the ign timing and report back. i also noticed that with the sharp pattern i think it might be the tps that is doing it. when i set the min max tps it is never a stable number it always is fluctuating, not by much say 11.9-12.0 so .1 but it does it very quickly.

[Scott@FP]

Try setting TPS Input filtering to 2 or 3. You don't want to filter too much as it delays response in your main fueling sensor which is generally bad. Also log injector actual or effective PW at a high rate and maybe find out if its chicken or egg on which sensor is the 'toother', it very well could be the TPS causing the RPM toothed fluctuation pattern via fuelling but its hard to tell. Log the TPS at 200 Hz as well, see if it is noisy, your 10Hz logging rate will filter out a significant amount of noise if it is in fact noisy.

[cra5hdown]

hi scott, here is the log you requested. thanks for the help