Velocity stacks?

Anyone done any velocity stack mods? I wonder how much would be gained. I also hear putting VSs off a 1000 will give you a couple ponies but i'm not sure. Anyone heard of this? Do they fit on a 600 without any modifications? Any other tuning needed to accompany the VCs? I appreciate any insite.

    for the 06 and older.  get two sets of stacks and cut them in half.
then put back on the shorter stacks leaving the tall ones off.  it doesnt add horses but moves the powerband down a little lower in the rpms range (a remap is a good idea)

there are huge write ups on this over at 600rr.net

Thanks for the info.

the HP gain is like, half a horse at the very top. it's not worth the time or effort unless you have other modifications.

I'm going to have to replace the lower half of my air box because the stealership totally screwed it up. So I thought about while I was in there......... I'm not sure I'll do it yet. I'm just looking for some info. Thanks

I wouldn't do it,  like Baxsom wrote it moves the power around, ie you loose bottom & mid and gain some at the very top.  Now how much time do you spend near or at readline?  How much do you spend in the bottom and mid?  Assuming you predominatily a street rider.  Would you rather have more power most of the time, or less power most of time?

    i thought the shorter stacks move the power lower while longer stacks moved it higher.

admittingly i havent done a lot of research on this so i could have it backwards

i did the upgrade on my 1000rr, but i have other supporting mods and a custom map. there is a difference, but like i said, i have other mods to support the stacks-- gutted stock ram air intake, 06 stacks, arata ti s/o, pc3, custom map, flapper solenoid completely removed and filled in, flapper door removed, grate removed,  pair mod. anything over 7500rpms, and it feels like the turbo's are kicking in. lol

i have my old 04/05 stacks for sale if your looking for them. 20.00 shipped (lower 48 only).
lemme know and ill ship out asap.

quote:

ORIGINAL: baxsom

    i thought the shorter stacks move the power lower while longer stacks moved it higher.

admittingly i havent done a lot of research on this so i could have it backwards

 
Yep, You've got it backwards...In General,
Longer stacks = better TQ & HP in the low to midrange - It fills the the combustion chamber more effeciently at lower RPM's, but can't keep up with the volume demand at higher RPM's.
Short stacks = Better TQ & HP in the top - Not as efficient at lower RPM's, but is able to flow the volume required at High RPM's.
 
But there's actaully a lot more to it than that.  The the design, shape, size, angle, flow pattern, fill rate of the heads, throttles, Airbox, etc... all play a major roll in the overall effect that changing the length of the V-stacks have.
 
I'd never recommened the "Cut & Paste" V stack mod becuase while it shortens the length of the V stack, it keeps the same entrance lip radius as the stock length one, this will move the the power up in the range, but will not do as well as a properly designed (ie, The Factory pro, HRC or Ten Kate) stack that has a larger entrance lip radius making it more efficient (The shorter the length, the larger the radius needs to be).  I gues i'm just from the "If you're going to do something, do it right" school.  I haven't done any testing on the CBR, but I have some time on a flow bench playing with Ducati 748 head / throttle body / V stack (but without the airbox) and found that the length is definately the major factor in the outcome, but the lip radius, lip diameter and V stack to throttlebody junction (smoothness) all play a very important part as well.

    thats why i dont mess with these sort of things.
ocassionally i will argue with engineers at honda but airbox design is not one of them. just too much crap to deal with.

You can always get some giant billet stacks that bolt straight to the carbs that are covered with some wire mesh... LOL

(talk about top end...)

    i thought i had seen this somewhere.
in this thread the poster used the 4 short stacks from 2 sets of oem ones cut in half.
once mapped he gain midrange and top end hp

http://www.600rr.net/vb/showthread.php?t=56366

That's definately a better way as opposed to some of the guys on .net that were cutting a section out of the center and epoxing them back together (What I was refering to when I said "cut & paste").
 
That Dyno graph definately illustrates what I was talking about.  There is just over a 3hp at just under 14,000rpm and a overall increase from 13,250rpm to readline, but up to that point it just matches the stock (+ a little here, - a little there - which could be just the variance between two different runs).  That it didn't lose any down low susprises me, but not really.  Keep in mind the HRC and Ten Kate V stacks are even shorter than the stock "short" V stack, I think teh Factory pro is shorter ass well, but not by much.  But it definately shows two major things: 1) That there is some additional gains to be made here with some more R&D and flow bench time.  2) Honda got the V stack heights pretty damn good from the factory for a "everyday" rider.
 
Also some interesting reading on V-stacks from Marc at Factory pro here:
http://www.600rr.net/vb/showpost.php?p=695231&postcount=49

Good info. Thanks.

dont pay to have them put in... its about 45 mins of work. pretty simple. i cant tell you about power gains bcuz ive always had them