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Old 01-19-2013, 12:12 PM   #1
2012REDSS
 
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How much boost?

If I data log using my SCT and LiveLink II it says the max MAP I hit was 57 which using a kpa to psi calculator was over 8 lbs of boost. Is this right? I have a vortech v3 stock pulley 3.8in but I have LTs and 3in exhaust. I think I should be closer to the 5.5-6 lbs of boost range. Opinions? Someone want to take a peek at the data log and tell me how much boost its showing?
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Old 01-19-2013, 12:22 PM   #2
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Not exactly sure how your data logger processes this data. MAP is manifold Absolute pressure so depending on your Baro you should expect to see somewhere north of 100 KPA before you see boost. It is possible that your data logger is calculating and displaying boost directly. Just not familiar with your logger. Boost is pressure in the intake system above atmospheric pressure.
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Old 01-19-2013, 05:16 PM   #3
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Zero boost is ~100 kpa. Google for a kpa to boost psi chart not straight psi. I did a conversion to psi and it was high. Imade the same mistake and realized quickly my car wasnt making 27# of boost when it showed 195kpa.

http://ls1tech.com/forums/showthread.php?t=1469526
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Old 01-19-2013, 06:57 PM   #4
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ok so livelink is not measuring in kpa. my readings were -87 all the way up to 57. if 100 kpa is zero boost livelink is using some other unit of measure.

here is a pic of the log showing the map (light line) and rpm (heavy Line)
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Old 01-19-2013, 08:05 PM   #5
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What were you doing when this log was taken?
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Old 01-19-2013, 09:55 PM   #6
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WOT 1st 2nd and 3rd gear
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Old 01-23-2013, 01:09 PM   #7
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Quote:
Originally Posted by 2012REDSS View Post
If I data log using my SCT and LiveLink II it says the max MAP I hit was 57 which using a kpa to psi calculator was over 8 lbs of boost. Is this right? I have a vortech v3 stock pulley 3.8in but I have LTs and 3in exhaust. I think I should be closer to the 5.5-6 lbs of boost range. Opinions? Someone want to take a peek at the data log and tell me how much boost its showing?
Add Atmopheric pressure about 105 at sea level to those readings and use this chart to convert to PSI.
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Old 01-24-2013, 01:09 PM   #8
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Thanks Ted
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