K&N vs OEM Real World Drag Time Slips 01/11/18
 

Ran my Base A8 NPP No Tune and No Mods at Irwindale with M/T DR's 285/35/19's Thursday night First Run with OEM stock filter and second run with K&N OEM replacement filter. Time slips Dead hooked both runs changed filter between runs. Times slips:

https://cimg9.ibsrv.net/gimg/www.cor...94ff51969d.jpg

Just as I figured it would, the K&N gave you really no improvement. The better ET was due to the better 60ft, but the slight MPH drop indicates perhaps the K&N actually hurts horsepower very slightly. Although as an experienced drag racer myself, I know that changing weather conditions and different engine temperature can also affect power output too, it's not unusual to see the mph change by 1 or 2 from one run to the next without even making any changes to the car in any way.

The only real way to know for sure would be to run many runs on the same night back to back with and without the K&N. I suspect it would be too close to call. I think the best you could ever hope for with only changing to a K&N but keeping the same airbox layout, would be maybe 1 hp.

Also the air temp on the second run was cooler with the K&N over the OEM filter a degree or two.

Documented proof right there that K&N's claims about HP gains are patently false and misleading. Waste of money.

Dyno numbers may look nice but Real World a drag strip tell the real deal. It is not completely about the flow but how it flows and the power and torque curve at wide open throttle from a dead stop to the finish line. I don't race my car on a Dyno.

Hmm... a 0.4% improvement in speed and 0.7% improvement in ET...
If more data points confirmed those results, still not sure I'd be willing to spend the money...

There was actually a decrease in the speed, not an improvement.

K&N doesn't really flow any better than the stock air cleaner. It does, however, flow better than the stock air cleaner when it is dirty.

So basically what you're saying is that a clean air filter flows better than a dirty one :D

I would be willing to guess that I would see little to no improvement with Any Aftermarket Filter or so called Cold Air Intake system. I could almost Guaranty you No Aftermarket Suppliers would put me up to the challenge to prove the truth with one of the Aftermarket systems. I race almost every time when the conditions are good or better at Irwindale and Fontana so I know what my car does and it is very constant with similar weather. It is close to broken-in at just over 13,000 miles.

Real HP gains are not easy or cheap. Generally, unless you go with forced induction (which requires a lot of other work to do right), you need head/cam and possibly exhaust work to see any meaningful gains. If you just drop in a low-restriction filter, you'll just get more dirt in your engine.

Agree and I am one that is not looking to void my warranty. It is more impressive to have a great running No Mods or Tune car that runs great times. I get compliments all the time on how great my car runs and consistent at the drags, they find it hard to believe it is stock.

Amazing, isn’t it. Who would have thought that. :rofl:

I think what would be great to find that aftermarket air intake for the C7, that was reminiscent of the WOT carburetor full-throated roar - without any HP penalty.

That would be a nice, nostalgic addition for the warranty friendly mods, no tune guys.

Point taken, but still doesn't make it a "buy" choice...

The data shows there is no difference. A .005 difference in time is nothing. 5/thousandths of a sec is absolutely inconsequential. 7.43 to 7.43. The '60 is within a margin of error at .026 There is just nothing to see here in difference run on run. On any other occasion, these runs would serve as backup of a 7.43 time.

The C7 gets enough air since the Air cleaner and filter were designed for it.
I would not expect much with the stock C7 and a K&N.
Then with just looking at the slips is not going to tell you much. Your only getting a few pony's if any and that will change a little run to run will be hard to tell much with out looking at some data as well.

The BMS would get the best result.

The Z06 gets the same air filter and intake but does NEED more air.
The K&N base opening is the orifice and it is not any bigger than stock.
The Green Filter is a K&N style (I suspect really is made by K&N) and has a larger base opening thus sees better results on the Z06.
The BMS has a even larger opening (orifice) more filter media it shows the best of the filters for improvements.

The designing of the BMS showed the orifice size is critical and does come in to play.

:cheers:

A "drop in filter" is a bit different animal than a complete redesigned air intake system. The proven builder KATECH has used Haltech systems on most of there builds!!! It's the first thing they bolt on the car. And there's far more top builders that do the same. Has anybody looked at the size of the KN filter vs a good aftermarket complete redesign like a haltech???? How many times are we gonna go over this!!!! My haltech system is a bit different than a KN filter I can buy off my local Walmart shelf. Geez!!!!

This. I've been meaning for a long time to write a blog about oiled, cotton-gauze filters.

They are not snake oil but I don't think most people really understand what purpose these filters really serve. Of course the manufacturers' marketing of their products don't help either.

:iagree: The Halltech does what it says!