Help me figure this out (MRT Boost Cut Defender)...

[Fkyx]

Alright. Firstly, it's called a Boost Cut Defender, but in fact, it's a fuel cut defender. Second, I emailed MRT about a manual for it so I could read about it, and they sent me an old version of the documentation, which they say should work (application for WRX).
http://docs.google.com/Doc?id=d532khn_11ddxw9gf9

So I'm reading this and the term "boost sensor" comes up a lot. Where is *our* "boost sensor"?

Next, I'm thinking about how mine is already installed:


This begs the questions: 1. Is the MAF our "boost sensor"? or 2. Did the person who installed this do it wrong?

Even if #1 is true, I still think it was installed incorrectly. I never ran the boost past 12lbs, though... so I have no idea if the FCD was doing its job. Looking at the wiring job, though...

I'd love to get this figured out so I could reinstall it, and make it look clean. I'll throw together a diagram of the current install if anyone needs it. Thanks!

[PhyrraM]

Some cars will fuel cut at a certain MAF voltage. This is only reliable if the car is completely stock.

Our car do not cut on a MAF Voltage, but on a MAP voltage. So, for a WRX/Legacy SS installation it is wrong.

You should be able to follow the instuctions thay gave you without any problems.

[Fkyx]

Alright. So the FCD needs to be relocated?

[PhyrraM]

I, personally, would place it under the dash near the ECU. This,however, is a very tight spot and is a royal PITA to work in.

It can be safely place near the MAP under the hood. Hell, it lived there for who knows how long as it sits now, right?

[Fkyx]

Well, MRT claims it's fully waterproof, and that it's meant to be installed under the hood... so I might leave it. Regardless, I need to "redo" the installation... so I'm not sure what I'll do.

[biggreen96]

well you should definitely get it hooked up to the right sensor! I think at this point an under the hood install would be fine. But yeah, it will work much better when it's intercepting map voltages and not maf voltages.


I think the stock location is between the airbox and the strut tower it looks similar to this, with only one vacuum/boost hose going into it. http://www.otemotorsports.com/images/HK ... versal.jpg

good luck.