[nespharym]

Originally Posted by Driver72

Exactly, his test was not accurate at all.
He had a much dirtier stock filter, dynoed on different days, different tanks of gas, sounds like different settings on the dyno from different techs, using different fans with different amounts of air blowing on the front of the car.

His tests greatly favored the BMC air filter results.

Man, you guys are quick to be negative

First day after the 800 mile trip, with a novice tech 5.5rwhp gain with BMC

Today, put original BMW filter in ran dyno, took numbers of baseline, switched to the BMC filter and nothiced the 10rwhp gain.

The same fan was used both days, same position, same everything....is that clear enough, or do I have to include the clothes I was wearing and what I ate for lunch

[nespharym]

Originally Posted by Driver72

Exactly, his test was not accurate at all.
He had a much dirtier stock filter, dynoed on different days, different tanks of gas, sounds like different settings on the dyno from different techs, using different fans with different amounts of air blowing on the front of the car.

His tests greatly favored the BMC air filter results.

My tests favor BMC, for what, I am just posting the information...nothing to gain here. If you are so quick to point out flaws, then do the "perfect" test yourself.

I tell ya, try to be helpful, and the twenty cent panty patrol comes out from the shadows

[Terry335]

No one is trying to discount your effort, but extraordinary claims do require extraordinary evidence.

[Driver72]

Originally Posted by nespharym

Man, you guys are quick to be negative

First day after the 800 mile trip, with a novice tech 5.5rwhp gain with BMC

Today, put original BMW filter in ran dyno, took numbers of baseline, switched to the BMC filter and nothiced the 10rwhp gain.

The same fan was used both days, same position, same everything....is that clear enough, or do I have to include the clothes I was wearing and what I ate for lunch

Not being negative.

It's just to be fair your tests need to be more...well fair and scientific.

Again, redo the test with a new stock filter.
Do the test on the same dyno, same day, same tank of gas, same fans blowing in the same position.

Do runs with the stock air filter.
Take note of the oil temp gauge.
Turn engine off, let cool for a bit, and swap in aftermarket filter.
Turn engine back on and see if the oil temp gauge is in the same position as it was when you did the first run on the stock air filter.
Then do runs with the aftermarket filter.

That's what I did when comparing stock vs. K&N

It's gives about as accurate an account of the power gains as you can get.

I don't have any vested interest in either filter either.
But the (most likely) fact of the matter is, they will all produce similiar power gains.

There's only so much more air you can let in with aftermarket drop in filters.
If one lets significantly more air in than the others, it's probably NOT filtering the air as well as the others either.

I would suspect all 3 will produce power within 1-2 rwhp of each other, and that's within variance of what the car would produce on 6 runs anyway with the SAME filter on the same day, with the same dyno with allowing the engines temps to cool between runs so the engines temps are about the same on each run.

Again, I'd suspect 3-5 peak rwhp gains with all of them on the dyno that I tested the K&N on, with the relatively whimpy amounts of air blowing at the front of the car.

I would suspect 7-8 peak rwhp gains from all 3 if they had a higher capacity fan blowing much more air at the front of the car.

[bmwzimmer]

I would agree that using your old filter with XX,XXX miles on it is not a fair comparison to a brand new Drop in filter.

[nespharym]

Originally Posted by Driver72

Not being negative.

It's just to be fair your tests need to be more...well fair and scientific.

Again, redo the test with a new stock filter.
Do the test on the same dyno, same day, same tank of gas, same fans blowing in the same position.

Do runs with the stock air filter.
Take note of the oil temp gauge.
Turn engine off, let cool for a bit, and swap in aftermarket filter.
Turn engine back on and see if the oil temp gauge is in the same position as it was when you did the first run on the stock air filter.
Then do runs with the aftermarket filter.

.

Next time I dyno a product, I will put the word out to see the proper way to conduct the analysis

[Orb]

Would you mind stating the boost (type of tune) your running because the test is nice work and all, but it without any parameters. You need at least one parameter to have any meaning...thanks.

Orb

[SCCAForums.com]

I'd actually like to see people start dynoing the 'X-Brand' (K&N, ITG, BMC etc) first... and then reinstall a (hopefully new) OEM Filter... and post the 'LOSS'...

It is very easy to fool the ECU for a couple pulls by the car noticing a 'lean' condition due to less restrictive flow.

Do your BMC for two pulls... swap the filter to stock... and do two more pulls... then state what you have... and that will be how much power the 'aftermarket' filter really does.

Good luck,
Dave

[O-cha]

Originally Posted by SCCAForums.com

I'd actually like to see people start dynoing the 'X-Brand' (K&N, ITG, BMC etc) first... and then reinstall a (hopefully new) OEM Filter... and post the 'LOSS'...

It is very easy to fool the ECU for a couple pulls by the car noticing a 'lean' condition due to less restrictive flow.

Do your BMC for two pulls... swap the filter to stock... and do two more pulls... then state what you have... and that will be how much power the 'aftermarket' filter really does.

Good luck,
Dave

I would say a better test would to drive around with the BMC filter, like 1000 miles, then dyno the BMC filter and switch to stock.

Anyway there are a couple of threads on this, why is this the only one everyone jumped on.

[pdjafari]

lmao, are some people act. using the 'dirty filter' as a justification for why his new filter provided more HP?? I mean I could understand a filter w/ 50k+ miles on it....but guys are you fcuking kidding me?!?! 10rwhp difference..wow some of you guys are just...nevermind...

so many people on the forum who have no effing clue...a big LOL

[Orb]

Originally Posted by Terry335

No one is trying to discount your effort, but extraordinary claims do require extraordinary evidence.

Before you dimiss this what wrong with this whole test. Okay, we got 10 whp but does any know why or even have theory. It can be proven by hand calculation or it would be worthless. I'm not saying it the result are correct but how would one get there and prove it.

Orb