Measuring the flow performance of intake systems

[@tiitsaul9036]

Awesome content. 99% enthusiast never collect any data when modifying car and rely on butt dyno. I love your way of thinking.

[@JulianEdgar]

Measured data = much less wasted money!

[@alexhu765]

Thank you Mr.Edger. I bought your e-book mentioned in the beginning of the video. It's great to have videos to complement the book. Thank you again, from Canada

[@nissanOwns]

Wow you are a lifesaver. Been scratching my head trying to figure out how to accomplish thia. You sir deserve much more recognition. Thank you!

[@JulianEdgar]

Glad it helped!

[@bololollek9245]

New subscriber, love your videos Julian! You seem to make every topic interesting and easy to follow!

[@JulianEdgar]

Thank you!

[@phase3ute]

Panel filters can definitely increase horsepower. Most cars I’ve ever tested on my mainline dyno, it will increase from 3-8hp on most cars. And swapping between them will show the exact same figures. Consistent with the above hp increases

[@roflchopter11]

Interesting. What did you connect the recerence port to when measuring the pressure drop of the whole system? Ive seen the cabin develop significant negative pressure as the vehicle sped up.

[@JulianEdgar]

The pressures are so large that using the cabin as the ref pressure is not critical (unlike, say, when measuring aerodynamic panel pressures).

[@michaelw6277]

Oh hi, I just purchased this book. I look forward to reading it.

[@JulianEdgar]

Look forward to your feedback.

[@michaelw6277]

Julian Edgar Will do!

[@gregorykusiak5424]

My MAF sensor has a honeycomb mesh to presumably protect the wires of the sensor from whatever might make it past the air filter. I’ve often wondered if removing it would be a good idea or not, and there are some car forums that this modification is hotly debated. Have you measured a significant pressure differential in one of these yourself?

[@JulianEdgar]

Yes a long time ago I did some measurements and the airflow meter flow was improved by removal of the mesh. However, I cannot remember any of the figures now.

[@gregorykusiak5424]

Julian Edgar my only concern with removing the honeycomb would be a negative effect on the sensor’s calibration, but I suppose an electronic “cheater” modification might effectively remedy -or even improve- that; removing or adding voltage with a potentiometer to get it right.

[@JulianEdgar]

@@gregorykusiak5424 I doubt you need any electronic modification. The airflow meter records air mass passing through it - if there is more passing through because there is less pressure drop across it, then that will be measured. Note I am talking about just a simple mesh (eg Bosch hot wire airflow meters from the 1990s), not a flow-straightening honeycomb.

[@gregorykusiak5424]

Julian Edgar is the honeycomb effective/necessary or restrictive? What would be the pros/cons of removing it if it’s there to straighten the flow prior to a 45 degree bend in the intake tube, just before that narrows to the smaller diameter throttle body?

[@JulianEdgar]

@@gregorykusiak5424 Let's take a few steps back. What is the full-load pressure drop of the entire intake system, and what percentage of that is made up by the airflow meter?

[@roflchopter11]

On modern cars, why not measure thr MAF and MAP from the CAN bus? As long as you are at wide open throttle, that should give you points on the airflow vs pressure drop directly, together with atmospheric pressure.

[@JulianEdgar]

Because you can gain only total pressure drop, not see *where* the pressure drops occur within the intake system.

[@garryellis4601]

What range pressure gauge would you recommend for measuring naturally aspirated intakes

[@JulianEdgar]

Something around 0 - 30 inches of water (vacuum of course).

[@garryellis4601]

@@JulianEdgar thanks for the reply and thanks for the great videos .one more question the bellmouth tube you made for your airbox protrudes into the box rather than being blended against the wall your reason for this would be interesting

[@JulianEdgar]

@@garryellis4601 Easier to fit it in, and I prefer the pick up to be free to draw air from all around it as much as possible. But easy with the described techniques to trial different approaches and see if they make a measurable difference!