I had my car on the dyno the other day and was taking some datalogs while I was tuning. When I went back to the datalogs I noticed some interesting MAP readings. For one, my max map was 105 kPa at about 4500 RPM. How do I get slightly positive pressures? On top of that, about 6600 RPM, my map dips down to 88 kPa. So Im thinking somewhere my engine is getting choked. Head and cams are flowing more than either my intake manifold or Intake piping can give. My stock intake is slightly ported and gasket matched with a 60mm TB and the neck bored to match it. Time to start looking for a bigger intake maybe? I realize OBX ones are basically garbage until given a good go over, but it seems like it would be less restrictive than the stock one at this point.

If you are seeing above 100 kpa, then it is either an altitude factor or MAP signal/voltage correction issue by the ECU.

Originally posted by 740 turbo brick
I had my car on the dyno the other day and was taking some datalogs while I was tuning. When I went back to the datalogs I noticed some interesting MAP readings. For one, my max map was 105 kPa at about 4500 RPM. How do I get slightly positive pressures? On top of that, about 6600 RPM, my map dips down to 88 kPa. So Im thinking somewhere my engine is getting choked. Head and cams are flowing more than either my intake manifold or Intake piping can give. My stock intake is slightly ported and gasket matched with a 60mm TB and the neck bored to match it. Time to start looking for a bigger intake maybe? I realize OBX ones are basically garbage until given a good go over, but it seems like it would be less restrictive than the stock one at this point.

:thumbsup Good thinkin' Lincoln