Those claims never took into account of the RAM air effect as mentioned by Romans in this very thread.

The dyno tests prove it looses 2-3 hp with flies out and without ram air. Race tests indicate it's fastest with ram air and without flies. It would sure be interesting to hear some hypothesis about why this might be the case. Cooler air with ram air and maybe a small amount of pressurization in the air box? On the dyno with static air to the intake, the flies produce some kind of turbulence that is beneficial in the upper revs? ...but that turbulence actually is detrimental with ram air? Is it just as good to make the flies 100% open all the time as opposed to removing them? That's a lot of questions for 2-3 peak hp. I'd save those for competition racing. If it has an extra kick in the low to midrange, I'd take it!

I'll try something with my flies ASAP but I'd like to ride the bike stock more to make an accurate assessment. Did you need to adjust the fueling to get the benefit of flies opening earlier?

I referred to my Gen1's weakness below 3000 rpm in this years back in this thread. I was extremely impressed with its ability to accelerate smoothly from 2000 rpm in 6th gear after tuning. Probably, flies out on that bike optimized the improvement. I'll take that on my new Gen2 for sure but in all honesty, it woul be extremely rare that I would run the bike at or below 3000 rpm when riding fast. If it's a technical corner in road racing, just downshift a gear even into 1 if it's that slow of a corner. If my minimum rpm in sport riding is 4000, does it even make a difference if I do anything with the flies?

Thanks for reviving the thread. There's so much that has been learned that seems to be getting overlooked in the past ten years

* Last updated by: Rook on 9/11/2024 @ 5:03 PM *

For fueling changes so far my low/mid rpm AFRs aren’t off enough for me to be concerned. I’m using the Woolich racing datalogger and can monitor my AFRs as I ride. I will ride it for a few more days once I’ve had the chance to access the upper rpms, and pull all the data in at that time to see if a change is needed.

* Last updated by: siroht on 9/11/2024 @ 5:25 PM *

Update:

I rode for a few hours yesterday and this morning while monitoring my AFRs, even found a road in Mexico to do some top end pulls. I pulled all my fueling data into Woolich software and examined it and my AFRs are still in line with the same AFR targets I had set when the STPs were set to open @ 3000 rpms. My top end target in the 100% throttle column of 13.0 was spot on, so no adjustment needed there. Areas below 100% were off here and there by .01/.02% so that's not enough to warrant a complete fueling overhaul to compensate for the additional air.

Now I'll just wait for winter to arrive where temps top out in the 50's and humidity drops to 25-35% to adjust my fueling to compensate for the denser air, because I'm sure it'll run leaner when those conditions arrive.

To emphasize, after my rides I must say that the complete opening of the STPs has made a significant difference and based on my initial observations the G-force hit from down low all the way to redline is very noticeable and will rip your arms off the bars if you aren't hanging on. My bike performed admirably prior to this change(so I thought) and I had no complaints about its performance. I thought that I had extracted every ounce of power out of it being that it has every bolt-on mod for it. After this single change of having the STPs opened 100% across the entire RPM range my bike now runs cooler, the exhaust note is deeper and more growly, the intake sound is more noticeable. Out of all the mods I've done on my 14R, this is the mod where I could actually say I felt the benefits immediately. As some mods only offer minuscule performance gains and are difficult to discern if you gained anything. I'm now thinking that Kawi placed the STPs on this bike to tame the "monster", emission reasons and to modulate(limit)the torque/power curve for a more linear throttle response. From a performance standpoint the 14R performs absolutely better without them. Full stop!

Thanks siroht. I need to look into a Woolich setup. I guess I'll need to do that soon, I'm getting a full system exhaust and I'd rather have proper AFR adjustments from the start. It would be very helpful to be able to switch between the stock flies mapping and flies always open. If the flies are removed, you're not going to put them back in order to make a good comparison. ...and you have control over everything else with the Woolich system too. This will be an interesting adventure.

Anytime Rook,

If you decide to go the Woolich route you'd be more than pleased with all that you can do with it. For me, it has already paid for itself many times over since I purchased it, having flashed and tuned my 2012 and 2023 ZX14Rs many times over for different mods and fuel changes needed for those mods or season changes.

Glad to see you guys are still here tearing it up. I thought I would pop in and see who is still burning fuel. Low end power caught my attention lol

Hey there Romans! Still here after a three year lull. A brief synapsis, I crashed the 08 ZX-14 and it's a junk heap now. The crankcase cover did grind through, the bike flipped at least twice, the gas tank caved in on both sides, the tail frame broke and just about every electrical connector got yanked out. Numerous other destructions done to the bike. I was knocked out and slid half the length of a football field both on the road and through the brush. No broken bones, but some hellacious road rash. It was a deer strike. The deer didn't fare as well as I did. I still have the 08 busa but just didn't feel the motivation to ride or even complete the work I was doing on it. I suffered a huge emotional loss and to be honest, that scared the crap out of me. I plan to repair the 08 ZX-14 if possible or replace it with another Gen1 that I'll make an exact replica of the Rook ZX-14. I had a lot of plans for that bike and I'd like to finish it off as I dreamed.

I bought a 2024 ZX-14R last summer. I rode it about 350 miles. LOL I'm busy with a new job and most of the time I'm awake now, it's nighttime. Not exactly a good time to be out on a bike around here.

I have turbo money! Should I just go straight to the intercooled RCC Stage 2 Ultra? I wouldn't do the engine build for some time but as I see it, better to buy once and be prepared for the most. It might even be a race only bike. I still don't have the nerve to ride fast on the roads here. There's deer everywhere. No more deer strikes for me, thanks.

Hey there Romans! Still here after a three year lull. A brief synapsis, I crashed the 08 ZX-14 and it's a junk heap now. The crankcase cover did grind through, the bike flipped at least twice, the gas tank caved in on both sides, the tail frame broke and just about every electrical connector got yanked out. Numerous other destructions done to the bike. I was knocked out and slid half the length of a football field both on the road and through the brush. No broken bones, but some hellacious road rash. It was a deer strike. The deer didn't fare as well as I did. I still have the 08 busa but just didn't feel the motivation to ride or even complete the work I was doing on it. I suffered a huge emotional loss and to be honest, that scared the crap out of me.

Yikes !

I have turbo money! Should I just go straight to the intercooled RCC Stage 2 Ultra? I wouldn't do the engine build for some time but as I see it, better to buy once and be prepared for the most. It might even be a race only bike. I still don't have the nerve to ride fast on the roads here. There's deer everywhere. No more deer strikes for me, thanks.

OMG,,, you so picked the wrong guy to ask that question lol.

Hey,,, Rook,, Sorry. I didn't read back this thread until now. There is a name on this thread I want nothing to do with. In my opinion, he hurt this forum's respect and honesty.

Start a new thread anywhere his name is not on it. I will help all who ask for the truth only. No Drama or lies aloud.
I know many of you understand.

Thank You.

Rick

Right chere Romes....

https://zx14ninjaforum.com/messages.cfm?threadid=BD6CF3C8-A6BA-EEC0-ACAE2C1AA75706C7