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Is MAF calibration a necessity?

Practical Reflash Tuning

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Discussion and questions related to the course Practical Reflash Tuning

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Hi All, I've got a Toyota FJ Cruiser that I've just added a supercharger to. I want to tune it myself but firstly HP Tuners doesn't support it. I bought a Kess3 to do module cloning so I thought I'd invest in ECM Titanium, however Titanium only has maps for Base fuel, power enrichment fuel, spark timing, engine rev limiter - nothing else. I see most instances the MAF calibration is always first but if I can't access the MAF table, what do I do? I'm a beginner and would be my actual first ever tune so I don't know what I should do.

Hi Rob, I wouldn't say it's 'always' essential. It really depends if the intake is standard or modified and how far out the fuel trims are. If they're within say +/- 5% then that's about as good as you can hope for. In your case if you have no access to the MAF calibration then it's going to make life harder if there are larger errors. You 'can' bake in errors into your base fuel table in order to get the right AFR delivered to the engine at a worst case. It's not the nicest way to deal with it but plenty of tuners are too lazy to address the MAF calibration and do just that anyway.

Hi Andre, do you have any suggestions that would make life easier for me? I just can't justify spending the money on a standalone or a new learning curve in Winols. I'm not sure what I should do.

In most cases, fitting a supercharger or turbocharger to a naturally aspirated engine will require significant tuning changes, including MAF calibration, if the vehicle is fitted with a MAF sensor and you’re going to continue using it.

I’m not familiar with that vehicle, but a quick search indicated a MAF sensor is fitted.

The two supercharger kits I quickly found come with a required reflash tune. Have you purchased a kit like that and you’re hoping to make some additional adjustments, or are you on your own for tuning?

If you’re looking to do it all yourself, check fuel trims as Andre suggested, during idle, light throttle, then while monitoring a wideband air fuel sensor, carefully see what happens at moderate and high throttle input. If the fuel trims and result air fuel ratio are acceptable as is, you may have lucked out. If not, you know you’ll need a solution including MAF rescaling or perhaps a speed density conversion, to properly calculate air mass.

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