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Old 12-18-2011, 11:39 PM   #1
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Default MAP never reach 100

I am going to switch to ITB load from Alpha-N.
I found I can never reach 100 KPA.
Any Idea?

I am using 4bar map sensor

Thanks
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Old 12-19-2011, 12:29 AM   #2
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What is the map reading when the engine is off?
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Old 12-19-2011, 01:13 AM   #3
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And where is the MAP sensor connected to on the intake manifold?
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Old 12-19-2011, 01:33 AM   #4
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Whats barometric pressure in your local area?
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Old 12-19-2011, 03:50 AM   #5
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map reading is 90kpa when engine is off.
It was about 60 before i change to ms2.

My itb has 5 plug for me to connect to the vacume hose. 4 for each individual cyclinder and the pther one for the sum.
I connected my Vacume hose to the sum.

Barometric presure is 99 to 100 shown on the 2nd map output.
And i am locate in hong kong.
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Old 12-19-2011, 04:24 AM   #6
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What altitude are you at?
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Old 12-19-2011, 04:35 AM   #7
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The log was taken beside the sea.
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Old 12-19-2011, 07:07 AM   #8
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picture of your 4 bar map sensor, also why are you using a 4 bar map sensor instead of a map sensor that reads just above 1 bar?
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Old 12-19-2011, 07:30 AM   #9
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Quote:
Originally Posted by techsalvager View Post
also why are you using a 4 bar map sensor instead of a map sensor that reads just above 1 bar?
mspnp9497?
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Old 12-19-2011, 11:22 AM   #10
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Quote:
Originally Posted by Techsalvager View Post
picture of your 4 bar map sensor, also why are you using a 4 bar map sensor instead of a map sensor that reads just above 1 bar?
the reason i changed to 4 bar sensor because my car went very lean when i go on the hill, which was the way i go to work. then i changed to 4 bar sensor and fixed this problem.




and my MS was a piggy tail MS2 just got upgraded from MS1.
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Old 12-19-2011, 02:23 PM   #11
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plug your intake with this:



should push you up over 100kpa.
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Old 12-19-2011, 03:04 PM   #12
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Just calibrate it with "tools --> senor calibration".
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Old 12-19-2011, 06:30 PM   #13
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Quote:
Originally Posted by oprso View Post
the reason i changed to 4 bar sensor because my car went very lean when i go on the hill, which was the way i go to work. then i changed to 4 bar sensor and fixed this problem.
Something sounds wrong there.
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Old 12-19-2011, 10:03 PM   #14
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Quote:
Originally Posted by Techsalvager View Post
Something sounds wrong there.
my car used to go lean when i hot start it before I changed to 4 bar sensor. And the problem gone since i changed the mapdaddy.
Also, since i am using alpha-N, the engine react badly with the engine load change.
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Old 12-19-2011, 10:42 PM   #15
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I don't see how a 4 bar sensor would fix either of those issues unless your calibration of the orginal sensor was incorrect and that would be for the load issue only.
The hot start issue could be few different things from the stupid ideal gas law crap, to other issues related to injectors.
Hell you shouldn't even need a MAP sensor if you are using Alpha N for Fuel and Spark load calculations.
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Old 12-19-2011, 10:55 PM   #16
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Quote:
Originally Posted by Techsalvager View Post
I don't see how a 4 bar sensor would fix either of those issues unless your calibration of the orginal sensor was incorrect and that would be for the load issue only.
The hot start issue could be few different things from the stupid ideal gas law crap, to other issues related to injectors.
Hell you shouldn't even need a MAP sensor if you are using Alpha N for Fuel and Spark load calculations.
yes you are right. because I got my MS before i changed to ITB.
And I recently upgraded to MS2 and found the ITB load which need the MAP sensor, otherwise i wouldn't notice my map reading is not correct.
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