[QUOTE=matto20v;824627]Now, now RJ... old ways too soon...[/QUOTE]

Not that, no way.

Just thought he had more to do with E-tune by iaperformance rather than anything to do with Ecutek...reading from the iwsti threads.

What it comes down to , is the airflow meter needs to be rescaled to suit the improved airflow or use of a aftermarket ECU and lose the MAF . It comes down to Volumetric Efficiency calculation. Factory Ecu uses the airflow meter in its VE calculation ,Injector flow , latency , engine capacity , fuel pressure , manifold pressure, type of fuel. When any of these parameters are modified they need to be rescaled.

Some cold air intakes change the airflow BEYOND the reading capabilities of the factory MAF making rescaling redundant. Power Fc compensates by allowing other MAF sensors to be fitted Nissan etc then rescaled. Some aftermarket ECUs allow this or ditch the MAF in VE calculation . The factory ECU is stuck with the factory MAF.

Volumetric Efficiency Tuning 101 .

[QUOTE=amtrapid;824636]What it comes down to , is the airflow meter needs to be rescaled to suit the improved airflow or use of a aftermarket ECU and lose the MAF . It comes down to Volumetric Efficiency calculation. Factory Ecu uses the airflow meter in its VE calculation ,Injector flow , latency , engine capacity , fuel pressure , manifold pressure, type of fuel. When any of these parameters are modified they need to be rescaled.

Some cold air intakes change the airflow BEYOND the reading capabilities of the factory MAF making rescaling redundant. Power Fc compensates by allowing other MAF sensors to be fitted Nissan etc then rescaled. Some aftermarket ECUs allow this or ditch the MAF in VE calculation . The factory ECU is stuck with the factory MAF.

Volumetric Efficiency Tuning 101 .[/QUOTE]

Good info troy :thumbup::thumbup::thumbup::thumbup:

using the Perth-WRX mobile app

[QUOTE=matto20v;824627]Now, now RJ..

You've just spent $10,000+ on an engine rebuild to earn [I]some [/I]credibility and forum-respect around here. Don't go back to your old ways too soon...[/QUOTE]


Yeh nothing to do with the blown head gasket.

[QUOTE=amtrapid;824636]Some cold air intakes change the airflow BEYOND the reading capabilities of the factory MAF making rescaling redundant[/QUOTE]

Cheers, exactly what I was trying to suggest but that was far better put and more succinct.