I was wonderin' if anybody uses them, or has used them. The reason I was askin' was because factory pro has them the website is www.factorypro.com
velocity stack
broker06
1 - 20 of 30 Posts
I was wonderin' if anybody uses them, or has used them. The reason I was askin' was because factory pro has them the website is www.factorypro.com
They look decent. I've designed and made some for automotive use before with decent results. However to really take the best advantage of a velocity stack their design appears to lack the proper diameter and radius to the edge necessary. And it doesnt appear to have much if any taper down as it reaches the factory components.
Hi CSiJason -
Were the stacks that you made for an IR individual runner intake tract or for a carb or airbox inlet?
and In good humor.........
Ya'll might think, for some gol durn reason, that we just slapped some shallow taper, small radius stuff together and threw them on the market without dynoing (on a real, EC997 low inertia brake dyno, not a dealership level dyne) on about 30 different bikes?
And ya'll really don't think that we weren't particularly overjoyed that the shape that actually worked on the engine on the dyno was WAY different from "conventional wisdom"?
<chuckle!>
Nah...... ;-)
I know what a "generally accepted" stack looks like and you know that we could make a 2-3 deg taper and a 3/4" elliptical inlet stack just as easily as what we sell - but -
The shape that we used is the shape and diameter that worked best for power and response.
I do have a set of huge radius, big ID stacks that fit the conventional urban legend criteria.
and.....
They....
essentially:
1. Look traditionally "correct" - and people buy them - because they "look" right.
2. Flow more air on a steady state flowing flowbench - more than the engine could ever pull into itself -
3. do comparatively little that's beneficial for power.
and I'm here to tell ya - an engine's intake port is, in many ways, has nothing like a flowbench's nice and steady airflow characteristics -
But - that took me 30+ years to figure it out and be confident about it -
Also - look at the new R1, all the R6's (even the carbed ones), the newer gsxr600s and 750, Aprilias, new 600 Kaws, etc...... and.... they look...... like Superflares......
We've been making our quickchange gsxr stacks for about as long as the oems have been starting to evolve into making stacks that coincidentally, look like ours.........
All in good humor -
Marc
Marc Salvisberg
Factory Pro Dyne Systems
San Rafael, CA USA
800 869-0497
Joined
·
53 Posts
I am running the factory pro stacks in my 07 gsxr 750. I noticed a difference running these in my bike. And I didnt feel so bad buying them because I got dealer discount.
installation takes a bit, but is quite simple, careful not to over torque the clamps on the throttle bodies when you go back together. Make sure and get some aviation gasket sealant to seal the base of the new stacks to the airbox. I brushed a light coat into the valley of the rubber boots, slipped them carefully into the bottom of the airbox, and then installed the stacks.
My bike power wheelied much easier right off the bat, I am waiting till I get the R-55 system to dyno, Got the PCIII already. The velocity stacks definitely gave the bike a meaner sound too.
installation takes a bit, but is quite simple, careful not to over torque the clamps on the throttle bodies when you go back together. Make sure and get some aviation gasket sealant to seal the base of the new stacks to the airbox. I brushed a light coat into the valley of the rubber boots, slipped them carefully into the bottom of the airbox, and then installed the stacks.
My bike power wheelied much easier right off the bat, I am waiting till I get the R-55 system to dyno, Got the PCIII already. The velocity stacks definitely gave the bike a meaner sound too.
Joined
·
8,473 Posts
So what are the benefits of trimming 13mm of your stock velocity stacks? More top end? More mid range?
Joined
·
18,605 Posts
They will make a difference according to everyone who has purchased them from us. The best is to dyno your bike then install them and dyno it again that way you can see the difference...most who do notice a difference. I would recommend getting a dyno tune w/ them. Great time is if you do exhaust/pc3 then just add these in there with it all so you get it tuned w/ everyone you want on there. If you installed them after the exhaust/pc3 you don't have to do a dyno tune again, but it would be a very good idea.
they are a great product for sure. For the price it's hard to go wrong. About the cost of a set of tires.
they are a great product for sure. For the price it's hard to go wrong. About the cost of a set of tires.
Re: velocity stack / airbox sealing
It never hurts to put non-hardening sealant at the airbox/rubber adapter groove.
Suzuki did it on the stock ones - but, it's not required if the fit is tight into the airbox. Many other airboxes and manufacturers don't use sealant - so it's, by no means, universally done (but it never hurts!
Interesting note:
You mentioned using "aviation sealant" -
In the aviation world, "the secret" sealant is your normal, everyday, motorcycle used, Three Bond #4 - aka Yamabond, Kawabond, Suzukibond, Hondabond.
It's one of the few sealants that will seal Lycoming crankcases.
They "move around" at high rpm (like, you know, high rpm = 2700 rpm
My favorite sealants are:
Three Bond #4, a gray, rubber based, easy to clean, "Case Sealant Liquid Gasket" (it's their number: TB1104) and is avail. at your "FLD" dealer.
http://www.threebond.com/aftermarket.htm
and the venerable... easy to remove and clean,
Gasgacinch
http://www.gasgacinch.com/
If I was using some sealant for intake, I'd use Gasgacinch - That's what it looks like Suzuki used at the factory.
Marc
Marc Salvisberg
Factory Pro Dyne Systems
San Rafael, CA USA
800 869 0497
Good tip on the sealant -
It never hurts to put non-hardening sealant at the airbox/rubber adapter groove.
Suzuki did it on the stock ones - but, it's not required if the fit is tight into the airbox. Many other airboxes and manufacturers don't use sealant - so it's, by no means, universally done (but it never hurts!
Interesting note:
You mentioned using "aviation sealant" -
In the aviation world, "the secret" sealant is your normal, everyday, motorcycle used, Three Bond #4 - aka Yamabond, Kawabond, Suzukibond, Hondabond.
It's one of the few sealants that will seal Lycoming crankcases.
They "move around" at high rpm (like, you know, high rpm = 2700 rpm
My favorite sealants are:
Three Bond #4, a gray, rubber based, easy to clean, "Case Sealant Liquid Gasket" (it's their number: TB1104) and is avail. at your "FLD" dealer.
http://www.threebond.com/aftermarket.htm
and the venerable... easy to remove and clean,
Gasgacinch
http://www.gasgacinch.com/
If I was using some sealant for intake, I'd use Gasgacinch - That's what it looks like Suzuki used at the factory.
Marc
Marc Salvisberg
Factory Pro Dyne Systems
San Rafael, CA USA
800 869 0497
Joined
·
369 Posts
Have it on my 600 with all the trimmings and they work great. Really noticeable around 8K. Thanks Marc. Shift star next, heard great things
Re: velocity stack gsxr1000 k7
![Image]()
That's an all stock 07 1000 with a stock exhaust and we didn't do FI tuning.
The dyno testing was done on an EC997 and was tested under load - and we all know that testing on a dynojet dyno or dj clone, might show less improvement at high rpm due to insufficient load as compared to the real worldish EC997 dyno test loading.
They are about 10mm shorter than the stacks that work on the 01-06 1000's.
Funny how 10mm difference makes a noticeable difference!
You can get them from your favorite supplier - Maybe Karns Perf or Moto Mummy? They have firsthand experience.
Best regards -
Marc
Yep - did the 07 gixxer 1000 -
The dyno testing was done on an EC997 and was tested under load - and we all know that testing on a dynojet dyno or dj clone, might show less improvement at high rpm due to insufficient load as compared to the real worldish EC997 dyno test loading.
They are about 10mm shorter than the stacks that work on the 01-06 1000's.
Funny how 10mm difference makes a noticeable difference!
You can get them from your favorite supplier - Maybe Karns Perf or Moto Mummy? They have firsthand experience.
Best regards -
Marc
Joined
·
15,582 Posts
Finally.... a dyno measurement that proves something! Dude, can you do a side by side comparison of a bone stock 06-07 GSXR 600 or 750? One with the SET valve properly adjusted and one with it disabled and fully open? There's been so much debate about what it does or doesn't do.
Re: velocity stack / SET Valve test for GIXXER person
If there's a bike local to us in North Bay (of San Francisco Bay) and the owner can spend a couple hours here -I'll donate the couple dyno runs.
The SET valve testing would be free.
marc@factorypro.com
I would do a test for a GIXXER.com member -
If there's a bike local to us in North Bay (of San Francisco Bay) and the owner can spend a couple hours here -I'll donate the couple dyno runs.
The SET valve testing would be free.
marc@factorypro.com
Joined
·
163 Posts
I have a set. Gained 3 peak hp and 3 ft lb of tq. Mid range I picked up 6 hp. Was dynoed at Karn's Perf.
1 - 20 of 30 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
