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April 25th, 2015, 12:07 AM   #21
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Some pics to compare airboxes
The weather is shit and have no time to ride this weekend anyway If I have any luck with customs sending my seat foam fast so I can finish seat mod it will be on a dyno in 2 weeks
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April 26th, 2015, 09:18 PM   #22
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Thanks for the pics! so its looks like its nearly a direct fit?
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April 26th, 2015, 11:11 PM   #23
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It's no problem swapping.
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April 28th, 2015, 07:34 AM   #24
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Great pictures, I'm looking forward to your dyno results. I finally had a look inside my airbox and fabbed a 60mm. (2.4 in.) extension out of plastic pipe and fit it tight it into the air inlet hole. There's plenty of room inside the 570 airbox. It doesn't have a wide bellmouth, but I was able to camfer the inlet to smooth the airflow. It will also keep any water and debris that makes it inside the airbox from falling into the intake.

So far, I like it. My butt dyno says it really rips now at 5000 rpm, but it did pretty much anyway.
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April 28th, 2015, 11:56 AM   #25
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I ordered one yesterday we'll see how it goes.
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April 30th, 2015, 08:12 AM   #26
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I have this one I would like to part with:






$45 + actual shipping costs

I had it on my 570 for 1 hour is all, part is like new.

PM me if you are interested.
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April 30th, 2015, 12:06 PM   #27
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For once I tend to disagree, I dont think this mod will help power.
Im thinking and I dont know so dont throw a swing at me ok

My 2c is length of the stack needs to be ok and from then on you can tune the tq peaks up or down, thats it.
Humans like a flare, but an engine cant see

Last edited by TomTom; April 30th, 2015 at 12:08 PM.
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April 30th, 2015, 01:10 PM   #28
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Take a look at page 62 of his Thesis. It is a graph of engine speed vs. increased/decreased power of various intake lengths compared to stock. You are right in that length does shift peak power, but it also can increase or decrease power because of the phase shift of the reflected wave either amplifying or cancelling the primary wave.

He likes the 120 mm extension because his student race car competes at 8000 rpm. I like 60 mm because it adds more mid-range. If you go even shorter than stock, it loses power all the way to near red-line. The net effect at any rpm is not intuitive. It needs to be modeled and tested.
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February 17th, 2018, 05:03 PM   #29
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2 years on...

I read the thesis.

The 390/450 trumpet doesn’t account for intake length. Intake length is the distance between the cyl head and throttle body
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February 19th, 2018, 04:06 AM   #30
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Why would the pulse stop there? It propagates all the way through the complete volume of the stack into the airbox.
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