Author Topic: PV idle question  (Read 349 times)

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Offline Sunny Jim

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PV idle question
« on: September 13, 2020, 06:34:04 AM »
Running PV and Target tune.
My current calibration has a start up issue.
Bike starts and the idle is high ,but decays back to all below the set idle and stumbles noticeably this wall happens within several seconds.
Hot or cold,  this occurs.
So do I consider altering the IAC crank to run table?

Offline rigidthumper

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Re: PV idle question
« Reply #1 on: September 13, 2020, 08:54:12 AM »
Look at/adjust the warm up enrichment table (adds fuel to cold motor) and the IAC warm up table (increases the throttle body opening, from cold startup)
If you have a much bigger displacement than actual ( CID increase to get the VE table within normal limits) then reducing the warmup fuel and smoothing/reducing the IAC warmup steps usually helps.
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

Offline Sunny Jim

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Re: PV idle question
« Reply #2 on: September 13, 2020, 03:44:42 PM »
Thanks for that info. I have zero’d The warm up table above 20degrees C . This fluctuation still occurs, regardless of temp.
Question - what will be the outcome if I alter the crank to run fuel , given this anomaly occurs ove a few seconds only?

Offline rigidthumper

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Re: PV idle question
« Reply #3 on: September 14, 2020, 05:21:18 AM »
Crank to run increases the IAC during starting, and does last a few seconds- too big of a number and the engine will flare up, too small and the engine will struggle to get going. These steps are in addition to the IAC warmup steps.
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

Offline Sunny Jim

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Re: PV idle question
« Reply #4 on: September 14, 2020, 05:49:14 AM »
Ok! So given I have scaled
Up the CID during several auto tune cycles, it would be reasonable
To assume IAC crank to run and IAC warm
Up tables will
Need
To
Be adjusted.

Offline rigidthumper

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Re: PV idle question
« Reply #5 on: September 14, 2020, 06:07:57 AM »
yes
Ignorance is bliss, and accuracy expensive. How much of either can you afford?

Offline Sunny Jim

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Re: PV idle question
« Reply #6 on: September 14, 2020, 06:24:47 AM »
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