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Old 07-04-2003, 02:14 PM   #1
Unsung Boxer
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Location: WA state
Default Missing Link, DIY question

Yes, i know its been discussed a million times. I did a search and it came up poorly.

Anyways, can someone quickly list, or put a link for the DIY Missing link w/ Home Depot parts. I figured since I have the day off, i might as well do this.

BTW, im not turbocharged yet. installing this on NA wont hurt anything right?

Also, if anyone has a link for the Fuel Rail mod, i might as well pic those parts up today too.

Thanks
Jake
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Old 07-04-2003, 02:21 PM   #2
8Complex

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DIY Missing Link?
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Old 07-04-2003, 02:32 PM   #3
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The dealy w/ the check valves that keeps the MAF sensor from seeing boost. Just had some time on my hands today and i wanted to get that thing outa the way.
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Old 07-04-2003, 11:29 PM   #4
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Default Boost Nanny

I believe your looking for the boost nanny found here on Wac/Waynes page Boost Nanny
Joshua
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Old 07-05-2003, 11:20 AM   #5
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Am I missing something? His page refers to how to make this for vehicles equipped w/ a MAP sensor. I dont have a MAP, I have MAF. Do i even need a Boost nanny then?
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Old 07-05-2003, 12:56 PM   #6
8Complex

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I think it's some, but it might be all, MY98-99's have external MAP sensors that work in conjunction with the MAP sensor as a check to make sure the car isn't boosting. Check the passenger side strut tower for things with vacuum lines hooked into them.
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Old 07-05-2003, 01:56 PM   #7
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I thought that was a barometric pressure sensor. But I could definately be wrong. I've been boosted for almost 2000 miles now without a check valve on that thing and it seems to run fine. Does this even matter?
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Old 07-05-2003, 11:28 PM   #8
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Default The answer is....

The Boost nanny is a fix for all NA MAF based subarus. Those MAF based cars use a MAP sensor in part of the emissions system. Without the boost nanny you will evenutally through a pressure sensor high check engine light. I have experinced this on to cars in a row without use of the Nanny.
Joshua
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Old 07-06-2003, 03:28 PM   #9
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98's don't have map sensors at all. Thus, the Boost nanny can not tap into it. I do not understand. Yekob... you dont have a map sensor either, how did u get this to work?

-Jake
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Old 07-06-2003, 06:20 PM   #10
Scoobie Steve
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Yes all maf suby's also have map sensors for altitude compensation. Its on your passenger side wheel well, it has three wires going to it and a vacuum line. IIRC the vacuum line also goes to a solenoid before making its way to the manifold
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Old 07-06-2003, 06:33 PM   #11
8Complex

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Ahhh, good to know my memory isn't failing me just yet.
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Old 07-06-2003, 09:41 PM   #12
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i thought that MAP meant Manifold Air Pressure, and ur telling me that this thing detects atmospheric pressure. Again, what does this have to do w/ Boost?

Any 98 RS-T guys wanna explain to me how to hook up a boost nanny? Darshu, Yekob? anyone

Jake
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Old 07-06-2003, 10:33 PM   #13
yebokmj
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Default Help is on the way

Okay here it is: The MAP sensor on the MAF based NA Subaru engines is not used like a MAP senor on MAP based cars. It is as you said monitoring Manifold Air Pressure on MAF based cars but for other reason than that of MAP based cars. I was told that the MAP sensor on the MAF based cars is purely part of the emmissions system, doesn't really matter what it does. The problem with this sensor and a boosted car is the voltage ranges the ECU is told is normal are exceded when manifold sees boost and that boost hits the sensor. When this happens the check engine light is tripped saying that the signal is high. The Boost Nanny used check valves to make sure that boost never reaches the sensor but the sensor still recieves vacume so that it get's it's normal voltage readings.
If this is still confusing just IM me later and I will try explaining it more.
Joshua
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