Dyno Video: K&N Panel vs Stock Air Filter:

 

I understand that hi flow air cleaners like the K&N get some of their hp gains by leaning the A/F. It would be interesting to display the A/F graph along with the hp plot. Is that information available?

 

A different air filter in the stock air box will not change the A/F ratio. It may flow more air, but it will also add more fuel.

I will have a look for the before/after A/F ratioo data. You can't update videos on YouTube, only delete/ re-upload, so I may make a specific video talking about A/F ratios and mods.

The A/F ratio is typically leaner on the non-OEM intakes due to turbulence from bends just before the MAF, or a larger diameter where the MAF bolts in.
This is because the MAF is tricked and can't properly sense the airflow. In this case, a tune can help put the A/F ratio back on track by looking at the fuel trims.

Since the G37 has a mass air flow sensor, it won't run lean when more air is flowing through the stock intake, as the MAF is designed to properly sense the airflow mass. If we had a carb, it would be different. Carbs measure AIR VELOCITY and our MAF based fuel injection measures AIR MASS.

 

If you can find the A/F data for your videos maybe just post a still shot on the forum. Anyway, thanks for the effort.

 

Great video and information, thanks for sharing!


Next video should add some of the HPS (or other brand) silicone intake tubes!

 

^^^ Thanks!

As for the post MAF tubes & re-dyno it would be interesting to the results, but I don't think it is in the budget. With the currency exchange, duty, tax, and shipping they would be around $200 Canadian.

 

Great vid. I'm subscribed and hope to see more DIYs with good production value.

I have some R2C hex panels on order and I'll take some comparative readings with the torque app when I put them in. The computer will adjust AFR automatically, but I'll see if there's any difference in the MAF gm/s values

 

^^^ I like this idea!
We should also look at the difference between the BARO (barometer sensor) and the MAP sensor at wide open throttle in second gear 2,000 - 7,500 RPM.

This will tell us the pressure difference at wide open throttle, with the different filters. Off the top of my head the K&N panel filters are about 8KPa / 2.3" mercury / 1.16 PSI.

ALSO data log the "Absolute Load" PID. The shape of this line represents the torque curve and the values are very similar to the volume-metric (VE) efficiency. More air = more power = more VE. Expect values just over 105%

 

Damn dude, you're gonna make me actually figure out how to use this app?

This should be a good test too since i just put in fresh paper filters recently before finding the R2C's on sale

 

Don't worry about figuring out the "Torque App".... I have partnered with an instructional designer to create high quality, easy to follow, to-the-point training on how to use Android Torque and iOS Fusion to data log PIDs and more.

The first episode should be out in a week or so.

 

Nice! If you can figure out how to read the transmission temp, that would be excellent

 

Funny you should mention that... We are reverse engineering the extended PIDs to show the automatic transmission temperature in a Torque plug in or an app. No ETA at this point, but it is in development.