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Old 09-06-2009, 11:04 PM   #1
general23cmp
 
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MAP sensor

Does the stock L99 have a single bar MAP sensor that needs changed out if going with forced induction?
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Old 09-06-2009, 11:13 PM   #2
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Do you mean MAF Mass Air Flow?... and what exactly do you mean by forced induction?
Blower or CAI
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Old 09-06-2009, 11:25 PM   #3
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No, I mean MAP...Manifold Absolute Pressure.

Typically LS engines have a 1 bar meaning they measure from full vacuum to atmospheric. A Supercharged Cobalt, for example, has like a 2 bar one to measure boost. many people, when tuning, decide to go without the MAF totally, and just use the MAP sensor for air estimates.

Let's say a turbocharger for sake of discussion....a Maggie might have that built-in.
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Old 09-06-2009, 11:35 PM   #4
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OK... got it... I've heard of some replacing the MAF with aftermarket MAP. Not sure if there is a stock MAP sensor someplace else.
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Last edited by mlee; 09-06-2009 at 11:53 PM.
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Old 09-06-2009, 11:52 PM   #5
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Well, I suspect it has both a MAF and a MAP from the factory.....The LS1 engines did. It's just that some folks do not MAF sensors and use the MAP solely.

I was just wondering if it needs swapped out for a boosted engine for the programming to work right.
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Old 09-07-2009, 07:19 AM   #6
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I thought the LS3 was 1.5 Bar, not sure on the L99.
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Old 09-07-2009, 07:31 AM   #7
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Yes, you need to replace it (if you are L99 for sure, I can only comment on that)...I got rid of my 1 bar and added a 2 bar...my tuner said it would have been cool if they would have come with the ZR1 style 3 bar, but oh well.
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Old 09-07-2009, 06:10 PM   #8
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Quote:
Originally Posted by pharmd View Post
Yes, you need to replace it (if you are L99 for sure, I can only comment on that)...I got rid of my 1 bar and added a 2 bar...my tuner said it would have been cool if they would have come with the ZR1 style 3 bar, but oh well.
Do you know any part numbers?
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Old 09-07-2009, 08:37 PM   #9
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Originally Posted by general23cmp View Post
Do you know any part numbers?
Send 1sickta a pm and ask him...I think he knows what to tell you to ask for.
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Old 09-07-2009, 09:19 PM   #10
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gmpartsdirect online catalog shows these part numbers for the ZR-1:

pressure sensor, baro 12591290

pressure sensor, inlet 12592525
pressure sensor, outlet 12592525

Please VERIFY these numbers before ordering.
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