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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 11-10-2011, 12:40 AM   #1
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3 bar map sensor

Hey there SL,
I got to get a 3 bar map sensor.
Where does it go and what does it plug into?

Can you tell I have no idea what ^^^ is

Stay tuned for more stupid questions
Cheers
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Old 11-10-2011, 03:38 AM   #2
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It goes where ever you want but i put mine where the old one was. You have to do alittle wiring yourself to have it hook up if your getting the GS one
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Old 11-10-2011, 04:43 AM   #3
 
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You'll be able to find one locally. In Oz, you can likely source one from any of the folks familiar with tuning the Holden Commodore. IIRC, the 3-bar MAP sensor is a standard GM part on some of the higher-output LS engines.
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Old 11-10-2011, 08:29 AM   #4
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The new map sensor replaces the stock map sensor, its located behind the engine and is attached to the strut brace, has the black silicone line going from the manifold to it to read pressure. The wiring is the same, so line up the new map sensor in the same orientation and then splice in the new map sensor, just cut off one wire at a time to be careful, splice on the new grommet and connector pin, when all 3 connectors are crimped onto the new sensor, you are ready to pull off the old one, two 8mm screws and attach the new one and then carefully plug in the connectors, they are kind of weak, so be careful, but make sure they are seated all the way. I had trouble with this once and ended up using some silicone to keep the wire connectors in the back side of the map sensor. Make sure you push the green grommets full into place to keep moisture out of the connections,

John
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Old 11-10-2011, 08:54 AM   #5
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What are the benifits of running one?
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Old 11-10-2011, 11:38 AM   #6
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What are the benifits of running one?
i would like to know this too

on honda if you were going to run over 10psi you need to replace the stock map sensor with a bigger one so it reads more boost and ecu can read how much and adjust mixture
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Old 11-10-2011, 04:14 PM   #7
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It allows you to run higher boost and have your fueling and ignition timing maps scaled up past 22psi. With the stock map sensor, you are saturated at 22psi, it does not read any higher, so when you tune a car with stg 5 or higher, you cannot map the timing and fuel maps past 22psi, this means you have the same timing and fuel at 22psi as you do at 30psi.

You can get it to run ok with stock map sensor, but it does not allow you to scale the timing and fuel all the way up and with the 3 bar map sensor, you can have the correct fuel and timing at 22psi, 25psi and 30psi. With the stock map sensor, you are running in the last column, what ever parameters you set in the last column, that is what its going to run from 22psi and higher.

It also allows you to raise the fuel cut function to 28psi, you cannot go over 20psi or so with the stock map sensor.

You can essentially get better control and more power out of the 3bar system, but you need a turbo that runs in the range that the 3 bar becomes a benefit, ie above 22psi,

John
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Old 11-10-2011, 11:54 PM   #8
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The new map sensor replaces the stock map sensor, its located behind the engine and is attached to the strut brace, has the black silicone line going from the manifold to it to read pressure.
Thanks Guys, That's helped
I don't suppose any one has a picture do they ?
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Old 11-11-2011, 04:25 AM   #9
 
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Thanks Guys, That's helped
I don't suppose any one has a picture do they ?

This stock one is a small black box, about half the size of a cigarette pack, attached to the front strut cross brace. In this pic, there's a wire dangling down to connect it to the wiring harness..

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Old 11-11-2011, 12:32 PM   #10
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This stock one is a small black box, about half the size of a cigarette pack, attached to the front strut cross brace. In this pic, there's a wire dangling down to connect it to the wiring harness
Thanks Mike, I know what you's are talking about now.
So I pretty much just cut the old one off and wire in the new one, huh
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Old 11-11-2011, 03:06 PM   #11
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I've just been out and had a look.
Looks easy enough

Famous last words .... he,he,he
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Old 11-14-2011, 03:38 PM   #12
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Because no one said it, and you don't seem to be, umm...an expert I'll say it: you must have a tune to run a 3 bar map sensor. If it even starts without a tune on the 3 bar I'd be impressed. If you got it to run any better than a lobotomized quadriplegic then I'll eat my hat.
Good luck and enjoy the unlocked boost
-Cm
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Old 11-14-2011, 11:13 PM   #13
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Because no one said it, and you don't seem to be, umm...an expert I'll say it: you must have a tune to run a 3 bar map sensor. If it even starts without a tune on the 3 bar I'd be impressed. If you got it to run any better than a lobotomized quadriplegic then I'll eat my hat.
Good luck and enjoy the unlocked boost
-Cm
Thanks for the heads up.
I'm in the process of getting everything together for a stage 5.
I know its sounds stupid but I just had no idea what it was.
I knew it had to be run with a suitable tune. I always wondered what that thing on the strut brace was
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Old 11-15-2011, 04:53 AM   #14
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I had my 9ksled running a 3 bar map on a stock tune. It idled like shit but others I could go down the road
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