Which part number is the shorter velocity stack?
14073 or 14073A
I’m guessing that it is 14073….just wanted confirmation before ordering them.

Thanks

* Last updated by: siroht on 10/20/2024 @ 8:22 AM *

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Answering my own question and providing a trail in case someone searches for this at some point in the future. The short stack is indeed part #14073.

Ordered them last week and they arrived today. Install took approximately 1 hour including removing and reassembling fairings. Seat of the pants indicates that the 4 short OEM stacks definitely provided some additional fire in the upper RPM range. When I quickly chop the throttle from 4,000 RPM the front wheel comes up with ease, where before it didn't do this, especially with my weight 250 lbs. Also there's a slight change when I'm cruising at 3500-5000 RPM, and when I roll into the throttle. The effect is like when you ride your bike with a restrictive OEM exhaust system and then you fit a full exhaust system. For the lack of a better term, It seems that the bike breathes better and is in a more relax state(torque loss)at that RPM range. Without a dyno, I'm assuming that this is trade off from running 4 short stacks, opposed to 2 short/2 long stacks. Since I'm a adrenaline junkie and prefer top end performance over the low/midrange area which is still very impressive, I think I'll be sticking with the 4 short stack setup for the foreseeable future.

I did perform some top end pulls to see if my AFR would be affected, and when I returned home and analyzed my logs my AFR's didn't change so it appears that the new stack setup did not affect my top end AFR.

Oh, when I returned home from my test ride, my WW ceramic wheel bearings were sitting at my front door. I wasn't expecting them until Friday. I'll be tackling the install tomorrow morning.

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Thanks for the update. There's going to be some mods going into my Gen2 soon too. I don't know how far I'll go with an NA setup. I'm thinking about turbo in the future and I'd have to undo a lot of them....velocity stacks for sure. I would try if it's not too expensive. I will get a pipe because I can't see riding with the stock exhaust for a year or more before going turbo.

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I plan to either turbo my current 14R or move to a H2. At my age, 55, time is limited.

The OEM short stacks cost $30 each compared to FP’s $400+ price tag. It was a no brainer for me.

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For the lack of a better term, It seems that the bike breathes better and is in a more relax state(torque loss)at that RPM range

Missed this thread. Think about it. My take on HP gain is to find what speed event happens faster. So the long stacks has the air rising up and over the stack. Where the short stack moves in faster by climbing less over the length of the stack.

Stock is a happy medium from la-la-land to tracking on land faster. Short stacks are for top end work. That's why you see the mechanical stacks lift on WOT.

Same would be to tighten the valves to the blueprinted numbers. Thus the faster speed event.

Pretty cool move, siroht. Let me get this straight...

when I'm cruising at 3500-5000 RPM, and when I roll into the throttle

... there is less torque or more torque? Is there an rpm range with less torque from stock?

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Much as I love my 14R, if I wanted a lot more power for road use I'd definately go with a H2. Smaller, lighter bike (although not by a huge amount), more nimble and a fully sorted motor with potential for even more, relatively easily obtainable power. Just a shame it's so fugly next to a 14.
If I wanted a straight line weapon just for the strip then yes, maybe a turbo 14.

Just my 2p.

valid points

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I plan to either turbo my current 14R or move to a H2. At my age, 55, time is limited.

Most likely, you have plenty of years ahead of you but right at this point, maybe not a lot of spare hours. Any point in my life where I had more time, I always had less money. I always found ways to enjoy what I could afford to buy with whatever extra income I had. Ironically, I probably enjoyed it more when I had less money because I had more time to enjoy it!

I'd go with the money rout if I were you. Undoubtedly the reason you're short on time is because you're using it to make money and take care of what you've accumulated. A factory boosted bike fits your situation. From a cursory overview, looks to me like a built, turboed ZX-14 will end up costing about the same as an H2. The 14's going to make more hp and it's going to be a little faster if you're racing. I would much rather be on an H2 for road reliability and as far as the hp, we already have more than enough to crap our pants on a stock bike. Do you test your bike against other's on the road? I don't. Cars, yeah, I have but fast bikes are likely to stick with you and it's just too apparent how dangerous that is. A faster bike with a sensible rider is probably going to lose just because he has enough sense to give up.

Me, I think my tolerance for danger on the road has been exceeded and I used the power of my ZX-14 to it's fullest about two or three times in the fourteen years I rode it. Now it's a heap, being wrecked at only 70~65 mph.

So, go with what works for you. I would have bought an H2. The main reason I stuck with the ZX-14 was because it was the bike I knew and the bike I was dreaming of owning 10 years ago. ....but I was already dreaming of owning a H2 at that time too! I went with the 14R and I plan to turbo it but if I have the money in the future, I might just get an H2. We go with what fits whatever our situation is but the truth is, they're ALL awesome bikes and you really can't make a bad choice.

Hub: ... there is less torque or more torque? Is there an rpm range with less torque from stock [with all four short velocity stacks v stock two high/tweo low?]

I think siroht is describing less torque in low to midrange rpm with all four intake ducts being short as opposed to two short and two long. He's comparing it to a full system exhaust where you have a similar effect. From what I recall, by the time you test your full system exhaust nine or ten times, you already forgot what the stock exhaust felt like. At least on the 14 and the Hayabusa, there's too much power down low and everywhere to really notice anything but a really significant change. Just my experience over 17 years (which is nothing compared some who have 40-50 full time years) but you look at the mod and if it seems like it might just kill you, that's a mod you will probably feel. Going +4 on the rear sprocket, you will feel (but even that doesn't kill you). Dropping the first 30 lbs, you will feel. ...IDK people talk about how much superior SS braided brake lines are and how much more resonsive the brakes are....I'm sorry, I don't feel it. I want to respect everyone's right to enjoy their mods but if you ask me the truth, my opinion is all mods are cool, some you can feel, only a few actually are useable. I go with the cool factor and worry about "feel" and "usable" later. That way, we're all happy! I'm in the mod camp but I totally agree with the stock camp too.

Much as I love my 14R, if I wanted a lot more power for road use I'd definately go with a H2. Smaller, lighter bike (although not by a huge amount), more nimble and a fully sorted motor with potential for even more, relatively easily obtainable power. Just a shame it's so fugly next to a 14.
If I wanted a straight line weapon just for the strip then yes, maybe a turbo 14.

I agree if you want no muss, no fuss power, the H2 is the turnkey bike but as far as looks, I like the H2. It's weird looking but it's real easy on my eyes. It's an amazing looking machine underneath too even though there's not as much covering it up as the ZX-14. That big corrugated pipe coming up into the back of the air box makes me drool.

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Thanks, Rook.

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You're Hubster.

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