K&N filter vs power - Wrist Twisters
 
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post #1 of 12 Old 08-13-2007, 06:24 PM Thread Starter
Tirone
 
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K&N filter vs power

I just got back from my local Dynojet tuner ( to get a custom map done ) I did quite a few dyno pulls and the results surprised me. I actually made more power approx 2.5hp across the range with the K&N filter vs the stock one ( max HP was 115.3hp )I have read the RC51 web page and expected the opposite. Anyone else done some dyno pulls with a K&N vs stock? Re my mods the culprit?


these are the mods on the 919 so far

TBR single side ( I know, I know )
PCIII USB
flapper mod
port and flow and about 0.003'' of the head
520 chain conv
galfer SS all around

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post #2 of 12 Old 08-13-2007, 07:08 PM
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Quote:
Originally Posted by wedge24 View Post
TBR single side ( I know, I know )
Yeah, I like my TBRs too!

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post #3 of 12 Old 08-13-2007, 07:13 PM
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+1 on the Two Bros Single Side Exhaust...

Unfortunetly I will be putting on a Scorpion Exhaust System when I get my pipes back from Jet Hot... watch out for these pipes in the for sale section

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post #4 of 12 Old 08-13-2007, 07:15 PM
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Every bike responds different to different mods. I would not look for a result from an RC51 to be indicative of of any inline four.

But when it comes to dynos..... well there are many variables. Max number mean diddly poo...

How smooth was the curve? That is far more important than peak HP.

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post #5 of 12 Old 08-14-2007, 09:02 AM
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The rc51 is to be compared to no other motorcycle known to man.

It is by far the best 2 wheeled machinery ever produced and should in no way have is scientific findings linked to another motorcycle.

Go on with your badself and your findings.....

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post #6 of 12 Old 08-14-2007, 09:17 AM
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Can you post your dyno sheet?

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post #7 of 12 Old 08-17-2007, 05:45 AM Thread Starter
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The hp curve was nice and smooth and the torque curve was flat like a pancake no spikes I will try to post it ASAP as soon as figure out how.

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post #8 of 12 Old 08-19-2007, 09:15 AM
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So I know it's been discussed as much as oil and exhausts, but what's the short scoop, are K&N filters worth it, or not?

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post #9 of 12 Old 08-19-2007, 12:16 PM
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Personally, I buy them for the easy clean characteristics. Pop em out, hose em down with degreaser and let them sit before rinsing out. Pretty easy and you got a nice 'new' filter. Performance.............don't beleive K&N. My ZX10R probably gained an RCH, but then again......maybe not!

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post #10 of 12 Old 08-21-2007, 05:25 PM
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I think he his refering to the write up by the RCV51 guy who dyno'd a 919 w/ and w/o a K&N and lost power witht he K&N. I thought that wirte up didn't make sence. Its nice to see someone tried it out. I also tried with stock filter and without one all together. No filter gained power. Only 1hp but it was the 4th pull and the bike was getting hot. Cooler probalbly would have been more like 2 hp. It also leaned out the bike from 12.5:1 to 13:1 air/fuel.

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post #11 of 12 Old 08-22-2007, 07:44 AM
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I dynoed my 919 with and without a K&N, the K&N run made .5 hp, an increase that small could be caused by many variables. I'm still happy I bought it, it's washable and that saves me $$$$$.

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post #12 of 12 Old 08-22-2007, 10:11 PM Thread Starter
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you're right touring919 I am refering to the write-up of rc51.org . Every dyno run I did (10 total ) the results where the same the K&N made more power everywhere.

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