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Roland@pcmtec

Air load capping at 1.05 in NA + Turbo/Supercharger

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Had an interesting support enquiry this week. An NA FG with a Raptor supercharger running 8-10psi.  The airload was capping at 1.05 causing all sorts of tuning issues, eg too much timing and fuel curve completely screwed once on boost.

The solution to this was the following scalars.

image.png.d02a3aa01ba7124b5573f18e5dfe68c5.png

 

auF0049 enables "Anticipation" mode where the PCM will anticipate the air flow. This logic also has a side effect of calculating the airload upper limit. If it is disabled the default upper airflow load is 1.05.

To fix the issue with the load we simply changed auF0049 to 1 and cylair max factor to 1, this meant the load increased from 1.05 to 1.7 which is what we expected for ~10psi

Just posting this up for reference if anyone else has the same problem when doing an NA + T or NA + Supercharged configuration.

I think the vehicle made roughly 220-230rwkw in the end with 10psi and 82°C intake temperatures (no intercooler). Intercooler or water meth would see a massive increase in power.

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If it's running boost, was turbo logic enabled? AY3A calibration, for example, has auF0049 disabled, and that is a turbo calibration.

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3 hours ago, Romulus said:

If it's running boost, was turbo logic enabled? AY3A calibration, for example, has auF0049 disabled, and that is a turbo calibration.

Yes even with turbo logic enabled it will cap at 1.05 load if you don't enable anticipation logic in that OSID. This was a HAEE3 OSID of which there was never a turbo variant made. HAEE4 was the next closest.

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Yes Romulus I have turbo logic enabled. I am running a f1a procharger side mount super charger. I am using a3za which is a ba gt file and adapting it. I couldn't find a reference to air charge logic in the ba tunes that's why I was asking. 

Thanks scotty

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Hi Roland just wondering if you could explain what the number in cylair max factor is doing.

Thanks scottu

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