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Old 11-19-2010, 11:11 PM   #9
gearmesh, inc.
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A further complication of having a MAF big enough to flow what you need on a healthy boosted application, is that there will be a weak airflow signal at idle airflow conditions through such a big bore. By nature, a built for boost engine with a lower compression ratio will have an even lower idle vacuum signal through the sample tube than a higher compression N/A engine.

No wonder most big time turbo setups just go ahead and and bite the bullet and go speed density from the beginning.

Back on the MAF subject, didn't Pro-M back in the day have a blow through MAF with a 360 degree sample port? Anyone know how that unit worked out?

The neat thing about a blow through MAF is that it can be placed right before the throttle body which enhances the response time of the MAF signal when compared to the rise of the TP signal. Most boosted intercooled setups have a lot of air volume in the plumbing that takes time to get moving when the throttle is whacked open. If your MAF is on the suction side of your power adder, your TP voltage spikes right up immediately when you whack the throttle. Meanwhile, all the air in the plumbing has to get moving before the MAF can register more airflow, thus a delay in air measurement, resulting in a corresponding bog in response. To help this out, the tuner can program in a big "accelerator pump" shot through the injectors to bridge the gap in response, albeit a less precise way of solving the issue.
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