This is my third attempt to get an airflow reading from the MAF sensor on the flowbench that will match relatively close to what the stock MLHFM curve predicts airflow to be.
The latest results are the 5.1x values.
I’m thinking that it is worth trying to adjust the output from the 5v power supply to pull the green line down and get it to match the stock curve. Possibly the 5v supplied to the MAF sensor should in fact be slightly more than 5v.
After a long battle with these oil lines, approximately 6 hours to get my turbo’s back in with them on, they are connected and the wastegate lines have been attached as well.
The lines to the N75 don’t yet have the adapter in place for my pressure sensor.
Attaching the oil supply lines to the oil distribution block was the biggest pita of the project, specifically the driver side line. The line on the driver side is just long enough to reach, but with the thickness of the stainless steel line, heat shielding, and running it adjacent to the coolant line it was a long effort to get the fitting at the oil distribution block hooked up.
Eventually I loosened the banjo bolt fitting on the oil distribution block to the point that the fitting was almost ready to fall out. Then I was able to maneuver the line and get the the AN fitting to thread and tighten everything up.
Shown below is how the lines are attached to the driver side turbo.
Here are a few additional photos of the oil and wastegate lines after getting them installed.
Something different from what I’m normally testing, a BMW part. Inlet pipes for the BMW E92 335i N54 3.0L engine.
For those wondering, at 28″ the higher flowing pipe has approximately 44% more CFM passing through it for the same pressure drop. A good example of how subtle design differences can greatly affect airflow.
Some additional photos comparing the two pipes and their shapes.
Adding a chart with extrapolated pressure drop information out to 350 CFM based off a least squares fit to the measured system data.
And some additional airflow testing of a pair of aftermarket options, one from MMP and the other VTT.