Velocity stacks mod before dyno? - ZX6R Forum
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post #1 of 27 Old 01-19-2017, 07:28 PM Thread Starter
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Velocity stacks mod before dyno?

Hi guys I'm curious if there is anybody on this forum that can shed some light here for me. The guy that's going to be my dyno guy here in the PNW has told me that I should look into putting the velocity stacks from the 09-12 bike onto my 13 636 bike before we dyno and reflash because these stacks will deliver better air flow and increase my power. This mod seems simple enough yet I cant find anybody anywhere having done a swap like this. Any advice? Anybody done it?
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post #2 of 27 Old 01-20-2017, 05:44 AM
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Painfullyslo has done this.

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #3 of 27 Old 01-20-2017, 06:21 AM
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I have them also. I could do a comparison before and after but I wont be heading to my dyno tuner till April

You can get them off eBay very cheap. I think I paid $20 shipped

Also to elaborate more... If you are not racing DO NOT do this. This isn't a gain in overall HP but how the power is deliver you will lose lower to mid range power in order to gain upper power. The stacks merely create a shift in power
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Last edited by MFChop; 01-20-2017 at 06:32 AM.
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post #4 of 27 Old 01-20-2017, 10:08 AM
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If I recall, the center two stacks on the '09-'12 are equal length to the outer pair.... with the '13+, the center pair has a longer flange, and possibly a slot at the base?

the '09-'12 are aimed at peak power, the staggered '13+ arrangement is meant to spread the power over a wider range of RPM. With the slightly larger motor, there was more to spread around.
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"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #5 of 27 Old 01-20-2017, 11:25 AM
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Originally Posted by RJ2112 View Post
If I recall, the center two stacks on the '09-'12 are equal length to the outer pair.... with the '13+, the center pair has a longer flange, and possibly a slot at the base?
INCORRECT here is a picture of my 2013 with 09+ stacks. The 09+ centers are different from the outers.



Also they completely different shapes all together
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post #6 of 27 Old 01-20-2017, 11:44 AM
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Originally Posted by MFChop View Post
INCORRECT here is a picture of my 2013 with 09+ stacks. The 09+ centers are different from the outers.



Also they completely different shapes all together
You have better insight than I do, LOL. I just have the '09 stacks, in my '09.
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"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #7 of 27 Old 01-20-2017, 11:48 AM
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Originally Posted by MFChop View Post
I have them also. I could do a comparison before and after but I wont be heading to my dyno tuner till April

You can get them off eBay very cheap. I think I paid $20 shipped

Also to elaborate more... If you are not racing DO NOT do this. This isn't a gain in overall HP but how the power is deliver you will lose lower to mid range power in order to gain upper power. The stacks merely create a shift in power
So, is the thought that since a track/race bike will almost always live in the "high" RPM range, that you don't care about the lost mid range power?

The engineer in me would love to see a before and after dyno on this

Last edited by ninjaman89; 01-20-2017 at 11:54 AM.
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post #8 of 27 Old 01-20-2017, 12:08 PM
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Originally Posted by ninjaman89 View Post
So, is the thought that since a track/race bike will almost always live in the "high" RPM range, that you don't care about the lost mid range power?

The engineer in me would love to see a before and after dyno on this
Exactly

Frankly Id love to see this myself. Pending if we have time after all my tuning is done I might take the time to do a comparison
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Last edited by MFChop; 01-20-2017 at 12:12 PM.
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post #9 of 27 Old 01-20-2017, 01:05 PM
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Originally Posted by MFChop View Post
Exactly

Frankly Id love to see this myself. Pending if we have time after all my tuning is done I might take the time to do a comparison
When are you tuning?

Also, did you confirm you have the inside/outside stacks in the correct order? I just ask because the order in your picture is the opposite of how you have them installed
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post #10 of 27 Old 01-20-2017, 01:35 PM
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When are you tuning?

Also, did you confirm you have the inside/outside stacks in the correct order? I just ask because the order in your picture is the opposite of how you have them installed
Mid April

Yes mine are installed in the correct order, I actually terrified it with parts diagrams (they have the Part #s on them). Ignore the generic eBay pics
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post #11 of 27 Old 01-20-2017, 02:24 PM
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Originally Posted by MFChop View Post
Mid April

Yes mine are installed in the correct order, I actually terrified it with parts diagrams (they have the Part #s on them). Ignore the generic eBay pics
Sweet!

Definitely post up your results if you do a comparison on the dyno. Its really nice to have actual data on this kind of thing. I didn't realize how cheap they were. I think I'll order some for my build as well. I'll just be tuning with an auto-tuner though.

I've been doing a little research on how velocity stacks work and have found a couple sources that say longer stacks are better for power at lower RPMs and shorter are better for higher...which makes sense since the 09+ are shorter. The only thing that weirds me out is that double-lip on them.
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post #12 of 27 Old 01-20-2017, 02:33 PM
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Quote:
Originally Posted by ninjaman89 View Post
Sweet!

Definitely post up your results if you do a comparison on the dyno. Its really nice to have actual data on this kind of thing. I didn't realize how cheap they were. I think I'll order some for my build as well. I'll just be tuning with an auto-tuner though.

I've been doing a little research on how velocity stacks work and have found a couple sources that say longer stacks are better for power at lower RPMs and shorter are better for higher...which makes sense since the 09+ are shorter. The only thing that weirds me out is that double-lip on them.
Might have to do with the 09-12 having 8 fuel injectors instead of 4. :


Martillo y Mantequilla #99

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post #13 of 27 Old 01-20-2017, 02:37 PM
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post #14 of 27 Old 01-20-2017, 06:33 PM Thread Starter
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Quote:
Originally Posted by MFChop View Post
Exactly

Frankly Id love to see this myself. Pending if we have time after all my tuning is done I might take the time to do a comparison
I will be getting my bike tuned within the next month, If I am lucky I will try and convince my dyno guy to do a comparison dyno run. Also the other question is how easy was it for you to switch the V stacks? Just ordered V stacks my bike, essentially doing what you did.
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post #15 of 27 Old 01-21-2017, 01:36 PM
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i have a carbed zx6r ,i too was trying to find what difference there was but never found any use full info ,i cant remember which way it was but,, all short was good bottom and mid range and all long was better top end but like i said not 100%sure what way round ,i got spare ones to fit when i get spare time i know its a fi but the air flow theory is still the same

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