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When idling should engine load be...
Posted: Mon Jul 09, 2007 6:36 pm
by dr.occa
staying in the 100kPa area and as i apply throttle the numbers should be decreasing towards "0"
i'm running the MAP application in an NA setup (4AGE).
Posted: Mon Jul 09, 2007 9:56 pm
by brentp
It's measured in absolute pressure. 100 KPa is wide open throttle, if normally aspirated. So, you should be idling in the 20-40 KPa range, and this varies widely by cam profile and timing, compression ratio, and of course, ignition timing.
Posted: Tue Jul 10, 2007 1:12 am
by dr.occa
brentp wrote:It's measured in absolute pressure. 100 KPa is wide open throttle, if normally aspirated. So, you should be idling in the 20-40 KPa range, and this varies widely by cam profile and timing, compression ratio, and of course, ignition timing.
this is strange then. when i idle it's in the 100KPa range but when i apply throttle, absolute pressure decreases...great....
Posted: Tue Jul 10, 2007 6:10 am
by brentp
So you're saying when you open the throttle the MAP reading drops?
Where are you tapping into a vacuum source? Do you have a manual vacuum gauge to compare vacuum reading to?
Posted: Tue Jul 10, 2007 9:19 am
by matnrach
Is your MAP take off upstream of the throttle i.e in the plenum chamber or airbox?