I know someone is going to think hey dumbazz intake tract...
Is there a reliable way to check for air intake restrictions while datalogging without installing a vacuum gauge?
I believe it could be done by comparing the baro KPA(in HG) at the top of datamaster with the Map (HG) at WOT. However, I'm not sure if this is accurate or how much of a drop is normal/acceptable.
Here's a screenshot....(the code was fixed but not cleared...this was the check ride to see if everything was OK )
You can compare the baro KPA to the MAP KPA when the engine is off but the key on. If the readings are close when the engine is off then the reading will be accurate when it is running. Any difference greater then 3.5 KPA between the two at WOT is a restriction in my opinion.
Should they not be the at same static reading if no air is flowing in the intake ?
1 atmosphere / 101.3 Kpa / 29.92Hg /14.69 psi
They should be the same but the sensors may be calibrated slightly different. That is why you need to look at the difference with the key on engine off and then running to see what the change is from WOT. If there is a large change between the two readings the intake is a restriction. I cannot see your graph with this computer so I do not know what are displaying exactly but I took a quick look at the graph on another computer last night and it looks like there is a large restriction at WOT high RPM. What I saw was a MAP reading of 27.?? and a BAR readong of 30.??, that to me signals a large restriction if the throttle was wide open.
They should be the same but the sensors may be calibrated slightly different. That is why you need to look at the difference with the key on engine off and then running to see what the change is from WOT. If there is a large change between the two readings the intake is a restriction. I cannot see your graph with this computer so I do not know what are displaying exactly but I took a quick look at the graph on another computer last night and it looks like there is a large restriction at WOT high RPM. What I saw was a MAP reading of 27.?? and a BAR readong of 30.??, that to me signals a large restriction if the throttle was wide open.
MAP 27.9 and bar 30.19 2.29"hg.....if this is a big restriction whats the fix?
MAP 27.9 and bar 30.19 2.29"hg.....if this is a big restriction whats the fix?
See if you can identify what the restriction is and remove the restriction. Clogged air cleaner or poor air cleaner, MAS to small or still has screens, poor air fliter housing, too small of a throttle body, intake ducting is too small or collapsing at WOT??
Would be interesting to see the pressure differential across a single plane carb intake @ WOT for comparision purposes
I doubt the intake manifold is restriction. The restriction is probably the air intake system ahead of the intake manifold. The MAP sensor measures pressure in the intake and it cannot be used to determine if the intake itself is the restriction unless the throttle body holes are too small for the amount of air the engine is trying to use.
It is not real bad but you are loosing about 7% of you avaialble power due to the intake restriction. In other words if you could get it to zero restriction you could gain 7% more power at 6900 RPM. Zero would be very difficult to acheive but even if you could get it to 1" of HG you could pick up 3.5% in power which could be 17HP on a 500 HP engine. A side note you do not need to go 154MPH to get these readings if you hit 6900 RPM in second gear it will also provide you the data you need. Where can you run that fast?
It is not real bad but you are loosing about 7% of you avaialble power due to the intake restriction. In other words if you could get it to zero restriction you could gain 7% more power at 6900 RPM. Zero would be very difficult to acheive but even if you could get it to 1" of HG you could pick up 3.5% in power which could be 17HP on a 500 HP engine. A side note you do not need to go 154MPH to get these readings if you hit 6900 RPM in second gear it will also provide you the data you need. Where can you run that fast?
Thanks for the information...as for 2nd gear I can't go to WOT in first or second gear the tires will just go up in SMOKE........
Corvette Store
Airflow restrictions in intake track ?
Holy Crap Mike! I gotta see this car! Next time I am in Covington, I will give ya a hollar if ya dont mind showing off.
