2 bar map problem

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Sep 19, 2008 | 10:05 AM

cjg454ss

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2 bar map problem

i have a cobalt map sensor, at 8psi on my turbo setup 370cu, my kpa is 185 or so, that seems like where 14-15 psi of boost would be, i think it is doubling it some how. i have the pid as a 3 bar map, the car is using hp tuner on a 3 bar SD tune. any info would help.

Sep 19, 2008 | 10:37 AM

jimmyblue

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From: East Central Florida

What is your key on, engine off MAP reading? Should
be 100kPa or so (less at altitude). That's probably the
best benchmark. A 2-bar MAP sensor ought to be at
about 2.5V at atmospheric. Maybe there is a discrepancy
between OS (2, 3-bar) and sensor (ditto).

Sep 19, 2008 | 10:43 AM

edcmat-l1

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First off,is your MAP reading 101-105 Kpa, key on engine off?
185 Kpa=26.8psi-14.7=11psi of boost

Sep 19, 2008 | 11:31 AM

foff667

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From: Clermont, FL

Quote:

Originally Posted by edcmat-l1

First off,is your MAP reading 101-105 Kpa, key on engine off?
185 Kpa=26.8psi-14.7=11psi of boost

I agree, also isn't the cobalt sensor a 2.5 bar? Which ultimately would skew your readings if you have your scaler's setup as 3.0 bar.

Sep 19, 2008 | 12:09 PM

cjg454ss

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i will test more this weekend, i did see 205 kpa and i think my WG spring is 8psi-12psi, i cannot remember. How should i scale the map if it is a 2.5 bar.

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