cold start idling Tiger 03

[Marc]

I wonder why the high idling last so long after a cold start out of the garage (at least a min.) before dropping down to approx. 1200rpm, while the Bonnie SE 2010 of my wife starts directly on normal idling revs.?
Though both bikes have Lambda sensors? But compare both engines is maybe a bit to easy :icon_scratch

Marc

[ChazzyB]

The ECU fuelling map has a table for temperature/RPM after start-up - that's what determines it.

[Marc]

The ECU fuelling map has a table for temperature/RPM after start-up

Ha! OK, and this proportion of t°/rpm can be changed in the ECU I presume.

[iansoady]

Yes but not sure why you'd bother  :?:

[Tigertriple]

I had a similar situation until I balanced the throttle bodies. Bike now runs fine from a cold start.

[Marc]

Throttle bodies have been balanced after fitting a new gasket underneath.
But no big deal, I just wondered why running at 2000rpm for half a minute when the bike comes out of the garage (16 degree). A few seconds would seem to me ok and then dropping to 1100rpm idling.
But I can live with that  

[ChazzyB]

I just wondered why running at 2000rpm for half a minute when the bike comes out of the garage (16 degree).

Yebbut, the normal running temperature for the engine's coolant (which is what's being measured) is high 90's Celsius. It doesn't get from ambient to running temp in a few seconds.

[Marc]

Thanx, this makes things a lot more understandable.

[Sin_Tiger]

Air cooleds heat up quicker and the Bonnie does have a fast idle aka choke.

All my tripples take a minute before they are happy while the Thruxton I can ride off almost immediately, but maybe that's down to the knob on the seat  

[metalguru]

Throttle bodies have been balanced after fitting a new gasket underneath.
But no big deal, I just wondered why running at 2000rpm for half a minute when the bike comes out of the garage (16 degree). A few seconds would seem to me ok and then dropping to 1100rpm idling.
But I can live with that  

This is quite normal behavour to keep the emisions low on start as it has to run rich from cold, however since remapping and playing mine will start from cold and the revs will drop to idle in about 5seconds or immediately if ridden straight away. Depends on the mapping.

[blacktiger]

I wonder why the high idling last so long after a cold start out of the garage (at least a min.) before dropping down to approx. 1200rpm, while the Bonnie SE 2010 of my wife starts directly on normal idling revs.?
Though both bikes have Lambda sensors? But compare both engines is maybe a bit to easy :icon_scratch

Marc

There's a big difference between the Tiger's efi and the Bonnie's efi.
The Tiger955i has an adapted Peugeot car system made by Sagem and is quite simple in operation. Therefore the ECU is programmed as if it had a choke and keeps the revs up until the coolant water warms up.
The Bonnie has a Keihin system, specifically design for bikes, with twin port injectors and all sorts of additional sensors around the intake ports and is capable of metering the fuel much more accurately.
It's actually nothing to do with the Bonnie being air cooled because my 800XC idles at,      er,      idle speed right from the start. It too has the Keihin system.