MAP readings
Thread Starter
Teching In
Joined: Apr 2016
Posts: 32
Likes: 1
MAP readings Hi all,
I have done as much research as I can and I can't seem to find the answer I'm looking for. When I am around half throttle, my MAP readings are around 80kpa and around 75+ throttle I'm getting a reading of between 98-100kpa, with idle kpa being in the low 30s. Is this correct or is there some sort of problem? I feel like my truck (1971 c-10 with a 03 5.3) doesn't have as much power as it should and I'm wondering if a bad potential MAP reading could be the cause. If someone can let me know if these numbers I'm seeing are where they should be that would be great.
Thanks,
Avery
I have done as much research as I can and I can't seem to find the answer I'm looking for. When I am around half throttle, my MAP readings are around 80kpa and around 75+ throttle I'm getting a reading of between 98-100kpa, with idle kpa being in the low 30s. Is this correct or is there some sort of problem? I feel like my truck (1971 c-10 with a 03 5.3) doesn't have as much power as it should and I'm wondering if a bad potential MAP reading could be the cause. If someone can let me know if these numbers I'm seeing are where they should be that would be great.
Thanks,
Avery
That doesn't sound too out of whack. You do, however, need to post up the specifics of your combo. The more detail you provide, the more intelligent response you can receive.
Thread Starter
Teching In
Joined: Apr 2016
Posts: 32
Likes: 1
Sorry. Forgot to do that.
It is a bone stock 5.3l out of a 2003 Silverado with around 150k miles on it. Haven't done anything to it besides delete vats and the associated codes that came with swapping into my truck (emissions,tranny,rear o2s,etc)
It is a bone stock 5.3l out of a 2003 Silverado with around 150k miles on it. Haven't done anything to it besides delete vats and the associated codes that came with swapping into my truck (emissions,tranny,rear o2s,etc)
Hi all,
I have done as much research as I can and I can't seem to find the answer I'm looking for. When I am around half throttle, my MAP readings are around 80kpa and around 75+ throttle I'm getting a reading of between 98-100kpa, with idle kpa being in the low 30s. Is this correct or is there some sort of problem? I feel like my truck (1971 c-10 with a 03 5.3) doesn't have as much power as it should and I'm wondering if a bad potential MAP reading could be the cause. If someone can let me know if these numbers I'm seeing are where they should be that would be great.
Thanks,
Avery
I have done as much research as I can and I can't seem to find the answer I'm looking for. When I am around half throttle, my MAP readings are around 80kpa and around 75+ throttle I'm getting a reading of between 98-100kpa, with idle kpa being in the low 30s. Is this correct or is there some sort of problem? I feel like my truck (1971 c-10 with a 03 5.3) doesn't have as much power as it should and I'm wondering if a bad potential MAP reading could be the cause. If someone can let me know if these numbers I'm seeing are where they should be that would be great.
Thanks,
Avery
As far as the 75kPa+ when driving that has to do with how much load the engine is under; Vehicle weight, gearing, tire size, power output, throttle position, grade of the roadway and a few other things will determine that.
At WOT your MAP kPa should be close to your KOEO MAP reading ideally. It's normally a little lower than that if you are running a plastic intake due to the restriction.
