MotoHouston.com MotoHouston.com
Register Members List Member Map Media Calendar Garage Forum Home Mark Forums Read

Go Back   MotoHouston.com > Technical > Performance and Modifications
Forgot info?

Welcome to MotoHouston.com! You are currently viewing our forums as a guest which gives you limited access to the community. By joining our free community you will have access to great discounts from our sponsors, the ability to post topics, communicate privately with other members, respond to polls, upload content, free email, classifieds, and access many other special features. Registration is fast, simple and absolutely free, join our community!

Register Today!

If you have any problems with the registration process or your account login, please contact us.


FREE MH Decals by MAIL!

Advertisement

Reply
Share This Thread: 
Subscribe to this Thread Thread Tools
Old 03-28-2010, 06:05 PM   #1
texasmade1
Member
 
Join Date: Mar 2009
Feedback Rating: (0)
Posts: 16












what are velocity stacks

i have a 2004 gsxr 600 and is it good to put velocitys stacks on it and what would it do?
texasmade1 is offline   Reply With Quote
Similar Topics
Thread Thread Starter Forum Replies Last Post
Velocity stacks order Mr.D How To's and Q & A's 14 02-22-2011 02:02 PM
Velocity stacks?!?!? Busa_Bullet Performance and Modifications 31 12-02-2008 04:03 PM
do velocity stacks require a full system? THE DEAN OF LEAN General Discussion (Moto Related) 7 06-02-2008 10:23 PM
Velocity Stacks questions?? HoustonGixxer Performance and Modifications 100 01-26-2008 12:56 AM
Velocity stacks instead of airbox? Metzzen1 General Discussion (Moto Related) 11 02-11-2007 10:31 AM
Advertisement
Old 03-28-2010, 06:13 PM   #2
DrAwkwArD
Banned
 
Join Date: Nov 2009
Feedback Rating: (1)
Posts: 1,231

Trackdays: 9











User is banned

.
DrAwkwArD is offline   Reply With Quote
Old 03-28-2010, 06:17 PM   #3
K. Oliveira
Cypress' OG Fo Sho!
 
Join Date: Aug 2008
Location: Cypress, Texas
Feedback Rating: (4)
Posts: 1,513

Experience: 2 years
Trackdays: 1

Bike(s):
2006 R6 Raven Edition




Member Garage





^^^ hahah lmao that's awesome
__________________
K. Oliveira is offline   Reply With Quote
Old 03-28-2010, 06:20 PM   #4
CaligoneTx
Forest Gnome Tour Guide
 
CaligoneTx's Avatar
 
Join Date: Sep 2007
Location: Valhalla
Feedback Rating: (1)
Posts: 21,558

Experience: 10+ years

Bike(s):
Triumph 675r
Ducati 748
Hyosungs (250r + 650r)
Honda 900rr
Suzuki Busa1300r (+2 bikes)






Send a message via AIM to CaligoneTx Send a message via Yahoo to CaligoneTx
Longer runners to the throttle butterflies create more responsiveness and torque at lower rpms, shorter runners help make more power at higher rpms.

Velocity stacks alter the flow of the air into the carbs/throttles.
__________________
triumphsig
CaligoneTx is offline   Reply With Quote
Old 03-28-2010, 08:42 PM   #5
jdm_phunk
RideTillDeathDoUsPart
 
jdm_phunk's Avatar
 
Join Date: Apr 2009
Location: Conroe tX
Feedback Rating: (0)
Posts: 297

Experience: 4 years

Bike(s):
05 CBR 600RR
50cC pocKet rocKet
95 Toyota Supra TT
95 ciVic






^^^+1
__________________
"yea every morning I waKe uP I excellence.."

This IS the biKe racK. . . RighT??
jdm_phunk is offline   Reply With Quote
Old 03-28-2010, 09:38 PM   #6
bluewave18
Safety Third
 
bluewave18's Avatar
 
Join Date: Oct 2007
Location: S.E.
Feedback Rating: (0)
Posts: 34,098

Experience: 10+ years

Bike(s):
08 Busa
03 XR 50








save your monies
bluewave18 is offline   Reply With Quote
Old 03-28-2010, 09:54 PM   #7
skelator
Just US Racing
 
skelator's Avatar
 
Join Date: Jun 2009
Location: Earth
Feedback Rating: (3)
Posts: 3,764

Experience: 1-3 months
Trackdays: 10+

Bike(s):
GT Performer









i put them on my 636 and wow ! the throttle is just so much smoother and the intake sound is louder. its easyer on me while riding with my old lady on the back cause she don't like a jerky ride and with my mods and gearing its less effort for me on our long rides to be nice on her neck but thats just my
2c
skelator is offline   Reply With Quote
Old 03-28-2010, 09:57 PM   #8
bluewave18
Safety Third
 
bluewave18's Avatar
 
Join Date: Oct 2007
Location: S.E.
Feedback Rating: (0)
Posts: 34,098

Experience: 10+ years

Bike(s):
08 Busa
03 XR 50








Quote:
Originally Posted by skelator View Post
i put them on my 636 and wow ! the throttle is just so much smoother and the intake sound is louder. its easyer on me while riding with my old lady on the back cause she don't like a jerky ride and with my mods and gearing its less effort for me on our long rides to be nice on her neck but thats just my
2c
A good tune will do the same. I think its smooth down low because its killing the low end power. Like Cali said long runners for low end and shorts for way upper RPM's.
bluewave18 is offline   Reply With Quote
Old 03-28-2010, 10:25 PM   #9
skelator
Just US Racing
 
skelator's Avatar
 
Join Date: Jun 2009
Location: Earth
Feedback Rating: (3)
Posts: 3,764

Experience: 1-3 months
Trackdays: 10+

Bike(s):
GT Performer









yes there super short almost flush with the air box the two in the middle are a little higher but not much. for me the loss of a little low end power is fine as i got a race bike for my fix and i ride the 636 everyday so comfort with a small loss is ok for me. my 636 ran a 6.60 1/8 and 10.50's 1/4 with stock ecu, no chip or nothing its plenty for comuting
skelator is offline   Reply With Quote
Old 04-01-2010, 11:14 AM   #10
THESCOOTER750
SCOOTER
 
THESCOOTER750's Avatar
 
Join Date: Dec 2009
Location: HOUSTON, TX
Feedback Rating: (0)
Posts: 20

Experience: 10+ years

Bike(s):
2003 Honda RC51 (RIP)
2006 Gsxr 1000 Sold
2005 Gsxr 600 Sold
2001 Gsxr 750 RIP






Velocity stacks do give you smoother air flow in to the throttle bodies. Minues the RC51 which I have now, all of my bikes have had them and for $250 I was always very happy with the throttle response and the growl you get from the airbox
THESCOOTER750 is offline   Reply With Quote
Old 04-01-2010, 12:00 PM   #11
The Trav
slowpoke
 
Join Date: Mar 2009
Feedback Rating: (0)
Posts: 2,552

Experience: 6 years
Trackdays: 1











when i got the latest bike, the guy threw in a set of short stacks, i put them on yesterday and the airbox is even louder now but thats about it. it may pull a tad stronger in the high rpms, but thats about it.

i put a set of all oem short stacks on the 03 gsxr 1k i had and it mainly just made the airbox louder. doing same-day back to back dyno runs, it picked up no power with just the stacks. with a tune to go along with the stacks (to even out the a/f) i wound up picking up about 2hp. pulled the stacks back out and went back to stock (2 long/ 2 short) and lost no power.

as bluewave said, a good tune will do the trick.
__________________
I will not allow myself the weakness to lay aside responsibility of my actions to a higher power and write that weakness off as destiny. Vigilance, intelligence and discipline keep us alive out there.
-kib
Rest In Peace Chris Owens aka faster321, you will be missed...
The Trav is offline   Reply With Quote
Old 04-07-2010, 07:10 PM   #12
bluewave18
Safety Third
 
bluewave18's Avatar
 
Join Date: Oct 2007
Location: S.E.
Feedback Rating: (0)
Posts: 34,098

Experience: 10+ years

Bike(s):
08 Busa
03 XR 50








The short stacks will only move the power around. They are for moving it to the very upper rpm's. Its not a mod to do just for the of it.
bluewave18 is offline   Reply With Quote
Old 04-07-2010, 07:43 PM   #13
spartandude
Custom User Title
 
spartandude's Avatar
 
Join Date: Apr 2009
Location: Somewhere near houston, ish.
Feedback Rating: (1)
Posts: 1,947

Experience: 4 years

Bike(s):
750 honda shadow spirit




Member Garage





With the speed of the air in internal combustion engines the air acts like a yo-yo. When the intake valve closes the air is still moving trying to get into the cylinder, but can't so it piles up and makes a wave. This wave travels back up the intake runner/tube until it reaches the end. What's not so intuitive is that the wave will actually bounce off of the open end of the tube and run back down the intake runner. The wave travels quickly, but does take a little bit of time to get to the end.
By changing the length of the tube you change the length of time the wave takes. When the wave gets back to the intake valve just at the point that it opens then the air rushes forward faster than with just ambient pressure. This gives you more power at that specific RPM.
Some intake systems have two tall stacks/runners in the center and short ones on the outside. This gives you two power points, but smaller power spike than if the runners were the same length. This will take you from stop to really fast more quickly than the posers who like bragging about their peak horsepower figures. Well unless you were able to keep your RPMs at that point.
Some cars use two selectable tubes to switch between low RPM and High RPM power. BMW even had a drum that rotated and gave a continuously tunable runner length. You should have seen the flat torque curve from 2K to 9K RPM. Lovely.
__________________
Quote:
Originally Posted by kibitzer View Post
My left eye turned into my skull and attempted to eat its way through my brain to escape the visual assault of stupidity. Awww , it just got to my Primary Motor Cortex. I can feeeeeeeeeeelllkknowqenf npnvpjw jwq uqvrp
spartandude is offline   Reply With Quote
Old 04-11-2010, 11:32 AM   #14
timboslice
public punchin bag
 
timboslice's Avatar
 
Join Date: Apr 2009
Location: paridise
Feedback Rating: (0)
Posts: 160

Experience: 1-3 months
Trackdays: 1

Bike(s):
A quick one









i played around with mine a little on a gsxr 750, I think i made three sets. One that contained two long and two mediums, another that had two mediums and two short, and the last having all short. Without changing the tune i interchanged the stacks to see how noticeable it was. All in all i agree with bluewave. They just seem to move the power, the factory replicas that i made from polished aluminum worked the best for just all around power and smooth delivery. The other sets gave about the same power but just concentrated it to top or bottom end. However there may be alot of truth to what spartan dude is saying, because i do think that the thickness of the lip at the top of the stack plays a role as well, but to what degree is so far inconclusive.
timboslice is offline   Reply With Quote
Reply


Thread Tools

Advertisement


All times are GMT -5. The time now is 07:12 PM.


MotoHouston.com is not responsible for the content posted by users.
Privacy Policy