Ok so after reading a little ...

**djcasanovar32** · 08-31-2011, 01:57 AM

I've been reading through this forum as if it were my bible. But have failed to come across a solid reason or full explanation of the benefits and why people switch to the z32 MAF ? What's the difference between that and the stock MAF ? What are the benefits of switching or completely ridding yourself of the MaF as a whole ? Help please ... And any help or guidance is beyond appreciated. I know I'm a noob and I'm doing my best with what little time I have available to myself to understand the full mechanics of my love so that I may make and keep her in the best shape possible.

**TheyKilledKenny** · 08-31-2011, 05:43 AM

Z32 MAFs are capable of handling more power at the engine. MAFs tell the computer how much air is entering just after the intake but well before the manifold. It isn't the most accurate system. A MAP sensor gives readings to the computer straight from the manifold, so it is much more accurate.

**Skym** · 08-31-2011, 08:50 AM

MAF is upgraded because when you turn the boost up via boost controller, the amount of air turbo sucks in maxes out AFM voltage. This max MAF voltage problem can happen with stock turbo at higher boost level or with a bigger turbo at a lower boost level. This max voltage problem from MAF, when converted to load on ECU side means it goes off the side of fuel, ignition maps where there can be not enough fuel or ignition timing. But before that happens, ECU uses what most know as a boost cut (known as a load cut, which I think is a fuel cut) to prevent engine going lean and blowing up. Also a MAF can have a intake airtemp sensor next to hotwire that can adjust for hot, cold environment, which affects the voltage sent to ECU.

Z32 MAF is calibrated differently to stock MAF. Basically the amount of air going through MAF compared to voltage that is sent to ECU is different and voltage to load table on ECU is adjusted to suit which affects load cells on fuel, ignition maps that have to be retuned. Stock RB20DET MAF is roughly rated to around 300hp and Z32 MAF 480hp (at engine). But with tuning tricks, can extend the hp limit of MAF, so hp limit's for MAF's are only a rough guide as to when you need to upgrade.

MAP sensor measures amount of air at intake plenum and is best suited to when you can't fit a MAF infront of turbo due to intake pipe size (big turbo or turbo's x2 on high hp engines) or when you run atmosphere vented BOV, ITB intake manifold like used on NA engines, etc. Also MAP is used over MAF because there is less restriction infront of turbo due to no MAF that has gauze screens x2 which can cause restriction of air to turbo and loss of hp.

MAP requires a IAT (Intake Air Temp) sensor to adapt to changes in intake temperature (hot, cold environment) and barometric sensor for altitude compensation. The maps for temperature correction, etc need to be tuned to suit. This is more $$$$ because it takes more time to tune / setup.

MAF setup is simple, cheaper to tune (not time consuming) and can adapt to additional mods without requiring a retune (but is recommended that you get a retune), adapt to barometric, temperature changes hence why factory use MAF instead of MAP. Also they can use a generic tune (one tune used on multiple cars) without having to do adjustments to suit each car like you would have to do with MAP.