Greddy pressure sensor, how accurate?

[Checkered-Member]

So the pressure sensor “replaces” the stock MAF, grate…

I am wondering how accurate it is.

And do I still need to run my stock maf, if not, how do I avoid error codes, or does the e-manage take care of that?

Lastly my instincts tell me I should place it right before the TB, true?

[Red-KAT]

In the book it sez thats its for use when your car runs out of range of the MAF or MAP... I'm not sure if it can replace the whole thing...

[Checkered-Member]

^ i know....I’ll have to call greddy about that.

I think its a grate deal, 100 bucks for a new "maf" rather then spending 100+ on a used maf and wiring it somehow, while this is plug and play

[MikeMurphy]

call greddy and post the response on here please.

[Checkered-Member]

This is what I found out:

The pressure sensor goes right before the TB

It doesn't replace the MAF, the ECU will continue to read from the MAF but e-manage will read from the pressure sensor.

In other words the e-manage will ignore the maf, you still need to run it to avoid error codes.

[huguetpj]

The pressure sensor goes right before the TB

BEFORE the TB, why?

[Red-KAT]

Yeah that seams kinda weard before the TB...

They have a cord that goes between your E-01 and E-manage to use the same boost signal, off the FPR... That way you dont need to spend the extra $120 if you have the E-01... I sent mine back.

[Checkered-Member]

^^^^ You guys are slow

TB = Throttle Body

What did you think it was?

[MikeMurphy]

BEFORE the TB, why?

I would assume because it only reads positive pressure, which makes sense since its used in conjunction with the MAFS.

[Checkered-Member]

I would assume because it only reads positive pressure, which makes sense since its used in conjunction with the MAFS.

And it can only be used with turbo or supercharger

[fiznat]

In other words the e-manage will ignore the maf, you still need to run it to avoid error codes.

Are you SURE about that? I did a *lot* of reading about the e-manage and how it works, and from what I understand, it still reads outputs from the MAFS, but uses the pressure sensor to expand the range/resolution of the map- so that you can tune more accurately and to larger dimensions. I'm REALLY not sure that it actually allows you to "forget about" buying a bigger MAFS...

[Checkered-Member]

but uses the pressure sensor to expand the range/resolution of the map- so that you can tune more accurately and to larger dimensions. I'm REALLY not sure that it actually allows you to "forget about" buying a bigger MAFS...

Quote »use this sensor to scale the map table, this is used when the factory system exceeds maf or map limit, best used with turbo or supercharged engines[/quote]key words: factory system exceeds maf so when the stock maf is maxed out, the pressure sensor takes over, or the e-manage ignores it, I don’t think the e-manage will read both sencors and "choose one"

[huguetpj]

I would assume because it only reads positive pressure, which makes sense since its used in conjunction with the MAFS.

That could be it

[fiznat]

oh okay gotcha, it ignores the MAFS once you've exceeded the factory MAFS' capabilities. Thats actually pretty sweet- save yourself sourcing and buying a Z32 MAFS.. Although still, everyone I know who has the e-manage uses a bigger MAFS AND a pressure sensor.

Does the e-manage software list the stock S13 MAFS?