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IAT Compensation on Haltech Elite

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Hi guys,

I would appreciate some thoughts regarding the IAT compensation on an Elite.

No problem here, just brainstorming.

The engine is a rather simple 1.3ltr N/A rally engine, running on 11.2:1 CR, OEM intake and mild cams. ECU is a Haltech Elite 1500.

The Haltech ESP software has an option for auto IAT compensation, which I haven't tried yet, but I am wondering whether i should, to simplify the STFT workload.

Following Andre's advice, i am currently using manual IAT compensation of around 2,5%/10oC, for normal conditions, but not leanning it out on high IATs to avoid running lean on heatsoak restarts.

Would it bring anything if i Switched the auto correction on and zero out all the manual table, except the hot restart area? Or i am just making things more complicated with no real benefit?

Any experiences ?


The auto mode (which is common in VE based fuel models) just accounts for the air temp directly in the main air mass calculation instead of doing it in a separate table. Generally I find that this is a little over bearing and will result in particular in a lean condition when the air temp sensor is heat soaked. By all means try it, but you may find that you need to then use the IAT correction table to add a little fuel back in to the low load, high IAT region. It's all a compromise regardless which way you do it as the IAT sensor doesn't report the charge temp entering the cylinders which is what we really want to know.