Monday, 6 April 2026

Cold/Hot Starting Challenges with Triumph 955i Tiger

 


https://www.triumphrat.net/threads/955i-daytona-speed-triple-difficult-cold-starting.974150/


look at the 'warm-up' table - just increase the enrichment factor at the lower temperatures - it makes a BIG difference

It looks similar to the Idle Table but the Idle controls Engine SPEED while the Warm-Up controls FUEL Enrichment

The position for the IACV is actually set while balancing - with an already warm engine, you balance the TB's and check the IACV position - it should be operating in the range of 30-35 steps when controlling at warm idle; if outside this range, adjust all the screws until you achieve both balance and IACV in that range. This puts the stepper in the ideal range for fastest closed-loop response.


changing the position in 'tests' does nothing while it is under active control - I've seen this claimed by others that this value will affect how it performs on overrun with closed throttle - my view is that whatever you change it to, it will be over-ridden in active control and if you go back after some time the number will not be at where it was previously set.


The other thing - recognize all that IACV does is adjust the air volume through the bypass ports - which controls engine speed - it cannot effect the fuel because there is no change to the TPS (unlike a Keihin system where the actual throttles are opening) - so the enrichment is does via the warm-up table.

https://www.triumphrat.net/threads/2003-triumph-tiger-955i-stalling.973651/











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