When idling should engine load be...

dr.occa · Post by **dr.occa** » Mon Jul 09, 2007 6:36 pm

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).

Post by **brentp** » Mon Jul 09, 2007 9:56 pm

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.

dr.occa · Post by **dr.occa** » Tue Jul 10, 2007 1:12 am

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....

Post by **brentp** » Tue Jul 10, 2007 6:10 am

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?

matnrach · Post by **matnrach** » Tue Jul 10, 2007 9:19 am

Is your MAP take off upstream of the throttle i.e in the plenum chamber or airbox?