Pipercross filters

shreddr · shreddr's Garage

Although I am a big believer that the stock air filter in the R12S is not a limiting factor, I am goint to try a few more things with the engine and don't want to leave any HP on the table. I am not a fan of the oiled gauze filters because I know they will let dirt past. I came across this chart on the Pipercross site claiming an 8.5 HP increase for a R12GS, that is pretty incredible! I wouldn't expect that with the S but maybe there is some easy HP lurking. Anybody familiar with these products?

SergioK · 12-21-2009, 09:04 AM

8.5hp from just an air filter! Stupid BMW engineers... what were they thinking leaving all that hp 'on the table'.

BoxerFanatic · 12-21-2009, 09:16 AM

Used to see that brand name in the british car parts catalogs that my dad has for his MG... mostly foam filters and stuff for people who put velocity stacks on their SU carbs, or for weber side-drafts that didn't fit the original filter housings.

Not heard much bad about them, but I am not all that familiar with them, either.

roger albert · 12-21-2009, 09:19 AM

That claim is so scientifically dubious as to be virtually unbelievable. It would be stretch, even if we gave them the benefit of the doubt of saying they got the decimal place wrong. Absurd.

shreddr · shreddr's Garage

if you look at the graph, it looks like this particular GS has a peak HP of almost 120, which is just wrong no matter how you look at it RWHP or crank. Ok so they have no credibility, but how about the quality of the product, is there any reason to believe this would be a better filter (in any way) than stock?

roger albert · 12-21-2009, 09:58 AM

I honestly have NO idea. Wish I could help. But as soon as there is one COMPLETELY bogus claim, the whole product and company's credibility is shot. Badly in this case.

BoxerFanatic · 10:36 AM

This may be a creative use of statistics...

It may not be accurate that it is an 8.5hp gain at max power.

It may be a maximum gain of 8.5hp, at the point of the greatest difference, not necessarily at the objective point of maximum engine power.

If the curves are real... (an assumption that I don't hold as absolute, they may or may not...)

Max power is all the way at the top, and the gap looks to be about 2-3hp (each band of white or green is 10hp...)

But lower, at about 6000RPMs, the curves have the greatest amount of difference, and it does look to be nearly 10hp difference at the widest point... 8.5hp is within that realm...

But who knows. it could be completely wrong.

But it wouldn't be the first time that a company touted the best looking statistic, rather than a more industry-standard technical stat that doesn't look as good.

SergioK · 12-21-2009, 10:48 AM

How's it going Ben?

1100s nut · 12-21-2009, 10:58 AM

Its easy to figure out. Dyno your bike with OEM filter...then remove the filter and see what happens. My bet is you will not see more that 2-3 HP difference. You can`t do better than without a filter all together. So I don`t believe they are better that zero resriction.

Lane

roger albert · 12-21-2009, 11:05 AM

And even that is a high figure. And it's not a matter of reading graphs. You simply can't get that sort of a percentage change in output from one properly functioning filter to another on these.

shreddr · shreddr's Garage

i think also that in order to get that kind of a gain with supposedly more air, the bike would have to been so rich it was spitting gasoline out the tailpipe, which we all know is not an R-bike attribute

EZ-RIDER · 12-21-2009, 01:15 PM

Jeff best thing to do is sell your bike and buy a S1000RR

shreddr · shreddr's Garage

Quote:

Originally Posted by EZ-RIDER

Jeff best thing to do is sell your bike and buy a S1000RR

the BEST thing would be to have both!

fralind · 12-21-2009, 01:40 PM

I will talk about the German importer, for 12S a filter then order measured on the test.
It seems to me this information but very very optimistic

Quote:

Ich werde über den Deutschen Importeur für eine 12S einen Filter bestellen dann auf dem Prüfstand messen.
Mir erscheint diese Angabe aber sehr sehr optimistisch

signit98 · 12-21-2009, 02:03 PM

Frank's going to check it on the dyno...

shreddr · shreddr's Garage

Danke, Frank!

2wheelmike · 12-23-2009, 08:32 PM

Quote:

Originally Posted by SergioK

How's it going Ben?

Ben or another?

sgoodwin · sgoodwin's Garage

These filters are very popular with the high horsepower zx-14 crowd, of course no filter or obstruction to air flow is even better, but they are less restrictive than oem filters. They make a street & race version with the diffference being less restriction for race. Somewhere I saw dyno comparisons for stock, k&n & pipercross with a small advantage to the pipercross.

turboflyer · turboflyer's Garage

They do not make one at least from what I have been able to find for the R1100S, but they do make one, two actually, for the 999S Ducati. I have been toying with the idea, a bit pricey for foam but maybe it is virgin foam. The bike came with basically a flat layer, non-weave gauze type. Some where i read there is a race a street version. Can not confirm. Seem adequate enough and are washable and re-oilable not unlike the pipercross. I think the pipercross claim to fame is greater dirt holding capacity before restriction becomes a negative factor. I might spring for a used set. I plan on cleaning and re-oiling one a year any way so capacity is of no real importance to me. Have you gone to their web site?