[nespharym]

Just returned from my trip...was at Race Precision Inc. this weekend and i bought the BMC air filter. Well, since I wanted to find out what my new rwhp was with the added mods, I decided to see if this thing was for real....and it was, a whopping 10hp on a DynoJet !!!

Here are the numbers

Baseline Runs: 344.32/ 345.93/ 342.44 hp
Final Run with BMC: 354.38/ 355.24 hp

The instal took less time than it takes me to change my underwear, so not much change in engine temp during the install

On another note, the dyno was the one we used to do a baseline on the vehicle when i drove it back from Atlanta. The baseline was 291....so, my increase in rwhp has been about 65rwhp.....it will get better once I have the new Mapping from AA

[scalbert]

I am curious, was the test done using a new stock filter or one with some miles on it?

[sflgator]

WOW!!!! Nice; I put myself on the next GB for the BMC Air Filter. Although I've been running with the ITG Air Filter, I'm not 100% sure it does anything; it might give 5-10WHP, but it's hard to tell. So, I figured I give the BMC Air Filter a shot. Although the extra 10WHP may not be noticeable from my butt dyno, this real dyno is certainly good news. Thanks.

Originally Posted by scalbert

I am curious, was the test done using a new stock filter or one with some miles on it?

dont think that would matter considering people who would replace their stock air filters already have a couple of miles....

[radgator1]

Originally Posted by that guy nico

dont think that would matter considering people who would replace their stock air filters already have a couple of miles....

It matters if a new stock filter would give the same results since it costs a lot less.

[scalbert]

Originally Posted by that guy nico

dont think that would matter considering people who would replace their stock air filters already have a couple of miles....

It does matter to compare number. If a dirty stock filter is being compared to a clean BMC filter it is not an equal playing field. Both filters should be new so that gains realized will be true.

[Jonmartin]

Pretty decent numbers

[nespharym]

Originally Posted by scalbert

It does matter to compare number. If a dirty stock filter is being compared to a clean BMC filter it is not an equal playing field. Both filters should be new so that gains realized will be true.

The car has about 4800 highway miles (PA to ATL to TX to CA back to TX)

and RPI has the filters in stock....I think he bought all of them available in CA

Eloy has a nice stack in the corner

[scalbert]

Originally Posted by nespharym

The car has about 4800 highway miles (PA to ATL to TX to CA back to TX)

and RPI has the filters in stock....I think he bought all of them available in CA

Eloy has a nice stack in the corner

So, a new stock filter was not used in the test?

[nespharym]

Originally Posted by scalbert

So, a new stock filter was not used in the test?

But, has anyone dynoed a new "stock" filter to one that has less than 5000 miles?

[scalbert]

Originally Posted by nespharym

But, has anyone dynoed a new "stock" filter to one that has less than 5000 miles?

A filter will get dirty within 5000 miles. It could possibly even be a few WHP; perhaps more. I didn't want to detract from the thread, I just wanted absolute numbers and would have even volunteered one of my clean stock filters.

[Boostin335]

100% clean or not 100% clean. 10 whp on a dynojet is good enough for me to spend a measly $85 bux...

[Terry335]

I think the filters are worth 5-6rw but keep in mind picking up gains on a dyno with a 25mph fan might not translate in to performance gains on the road. What you need is a lot of before/after trap speeds from the same day to really analyze it.

[nespharym]

won't be doing trap speed analysis any time soon....the dyno is all I have time for until the holidays are over

[Driver72]

Ok, wait a minute.

In another post you posted that the BMC got 5.5 rwhp.
You then said you were going out to buy a bigger fan.

Was this 10 rwhp done after you bought a bigger fan and blowing air directly onto the front of the car (grill area)??

BTW, when I did my test of the stock to K&N filter, both filters had about the exact same miles on them.
My stock air filter had about 2000 miles on it and the K&N had probably about 1300 miles.

And the 4.3 rwhp gain I saw was with a whimpy fan placed about 5-6 feet in front of the car, blowing at best 20-25 mph winds.
I reported that with a bigger/better fan 7-8 peak rwhp gains were probably what I would have seen.
That's probably what you would have seen too if the stock air filter and your BMC both had similiar miles (and therefore dirt) on them as well.



I agree though, if your stock air filter had 5000 highway miles on it, and the BMC was brand new, the test is a bit lopsided as well.

Did you have the air filter box on as well?

[radgator1]

Originally Posted by nespharym

won't be doing trap speed analysis any time soon....the dyno is all I have time for until the holidays are over

We appreciate the results I think the filters make a little power and this is probably one of the best ones.

[Driver72]

I will be redynoing my car very soon once the updated v2.0.2 map is done.

If there is anybody in the LA area with a BMC air filter who wants to show up, I'll do runs with the K&N and BMC on the same dyno, with the same fan blowing.

I'm pretty sure, and would bet, the gains would be about identical with both filters.

If there's also somebody with an ITG filter, I'll throw that in as well.

[nespharym]

Originally Posted by Driver72

Ok, wait a minute.

In another post you posted that the BMC got 5.5 rwhp.
You then said you were going out to buy a bigger fan.

?

The only thing we changed was the tech from the initial runs on Monday....after the car traveled 800 miles. The first tech was not as proficient with the dyno.....he had the car at 285rwhp for the base runs. So today, the tech who usually runs the dyno, did all the work.

[nespharym]

For those of you who asked

the BMC from Race Precision Inc. is not a GB....they are stocked at $85 ea

here is their info

Race Precision Inc.
7029 Marcelle St.
Paramount, CA 90723

(562) 630-5966
(562) 630-5968

[Terry335]

Originally Posted by Driver72

Ok, wait a minute.

In another post you posted that the BMC got 5.5 rwhp.
You then said you were going out to buy a bigger fan.

Was this 10 rwhp done after you bought a bigger fan and blowing air directly onto the front of the car (grill area)??

BTW, when I did my test of the stock to K&N filter, both filters had about the exact same miles on them.
My stock air filter had about 2000 miles on it and the K&N had probably about 1300 miles.

And the 4.3 rwhp gain I saw was with a whimpy fan placed about 5-6 feet in front of the car, blowing at best 20-25 mph winds.
I reported that with a bigger/better fan 7-8 peak rwhp gains were probably what I would have seen.
That's probably what you would have seen too if the stock air filter and your BMC both had similiar miles (and therefore dirt) on them as well.



I agree though, if your stock air filter had 5000 highway miles on it, and the BMC was brand new, the test is a bit lopsided as well.

Did you have the air filter box on as well?

FWIW I think with a better fan the stock filter would dyno much better, and the delta between the two would go down.

[Driver72]

Originally Posted by nespharym

The only thing we changed was the tech from the initial runs on Monday....after the car traveled 800 miles. The first tech was not as proficient with the dyno.....he had the car at 285rwhp for the base runs. So today, the tech who usually runs the dyno, did all the work.

OK, wait so these dynos were done on two different days too, with 800 miles driven on the car, and therefore different tanks of gas between the stock air filter dyno and the BMC dyno??

Sorry, but if that's the case, there is next to no validity to your test.

Like my dyno test of stock to K&N, it was done on the same day, same dyno, same tank of gas, with cool down times in between runs.
That's the only way it can be even remotely accurate.

[Driver72]

Originally Posted by Terry335

FWIW I think with a better fan the stock filter would dyno much better, and the delta between the two would go down.

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.