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BIKELAND > FORUMS > ZX-14.com > Thread: Top Speed Increase? NEW TOPIC NEW POLL POST REPLY
Thread: Top Speed Increase?
Heavy AK


Novice Class
Posts: 61
posted September 26, 2010 02:20 PM        
Top Speed Increase?

I am a 275lbs rider. I have a 2009 ZX-14 w/ BMC Airfilter, Muzzy full exhaust, PCV and TRE. I am dropping in the Muzzy 1451 Piston kit, switching to a 200 series rear tire and switing my gearing from stock to 17/43. I suppose I have to belive that a stock ZX-14 will only achieve 179 in 6th without any mods.

Will the extra 100cc and short gearing allow me to:
pull to 10500rpms?
run 192 mph?

lowered the gearing because of my weight...stock gearning is kinda slow with me aboard.


According to Gearing Commander I should be able to achieve 192.5 with those mods...how accurate would this be? I'm sure that a modded ZX-14 has a higher MRPM than 9250...

I am not tryingto get to the 200mph club but I would like to achieve a solid 190

Thanks for your help.
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A little GAS is a good thing!

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Shane661


Needs a life
Posts: 11481
posted September 26, 2010 02:24 PM        Edited By: Shane661 on 26 Sep 2010 21:26
Why only 10.5k??

That gearing with a tall tire will get you to 190. But don't run the 200 tire...run a 180/55. 200 is too much weight on the outside of the rim.

I ran 193+ on 17/43 with a tall tire. But I was spinning more than 10.5k rpm in 6th.

You need to remove the speed limiter to make this happen. And at 275 lbs you will need a lot of room, but it can be done with practice.

Also, I don't think you need +3mm bore for this. +2mm is a better choice for a street bike.

Shane

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wrongway


Pro
Posts: 1078
posted September 26, 2010 05:02 PM        
the limiter is actually 10,600 rpm , the tach is off by 600 rpm.

Roy

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Heavy AK


Novice Class
Posts: 61
posted September 27, 2010 12:44 AM        
+3/+2 bore

quote:
Why only 10.5k??

That gearing with a tall tire will get you to 190. But don't run the 200 tire...run a 180/55. 200 is too much weight on the outside of the rim.

I ran 193+ on 17/43 with a tall tire. But I was spinning more than 10.5k rpm in 6th.

You need to remove the speed limiter to make this happen. And at 275 lbs you will need a lot of room, but it can be done with practice.

Also, I don't think you need +3mm bore for this. +2mm is a better choice for a street bike.

Shane


The only piston kit Muzzy has for the ZX-14 is that 1451 kit...I don't have the luxury of having a performance shop anywhere close to me. Using the Muzzy is my best bet for quick HP/Torque improvements. I may just stick with the 190 tire but according to the Gearing Commander the 200 is actually a higher top speed than the 190...I guess bigger footprint equals more traction thus higher speed.
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Heavy AK


Novice Class
Posts: 61
posted September 27, 2010 12:48 AM        
limiter

quote:
the limiter is actually 10,600 rpm , the tach is off by 600 rpm.

Roy

so you're saying that I can run it out to 10600 before it cuts out the power? I usually shift at 10K in every gear to get up to top speed. Are you saying that I'm shifting too early? I'm pretty sure that the bike will never reach 10500 in 6th gear with me aboard...simply not enough HP/Torque to overcome my drag effect!

I do plan to get a speedo healer from healtech soon though... I was waiting for Ivans to come out with another TRE that removes the top speed limiter but apparently it's not going to happen.
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Shane661


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Posts: 11481
posted September 27, 2010 12:56 AM        Edited By: Shane661 on 27 Sep 2010 07:57
Remove the speed limiter on the bike and it will spin to about 11k actual in 6th gear. The tach will show about 11500 when it does this.

The bike will not hit the rev limiter until about 11500 on the tach.

You are shifting way too early.

I have held my bike at 11400 indicated in 6th for about 1/4 mile on a 209 mph pass. And I have tested the limiter, many, many times at the dragstrip.

Shane

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Heavy AK


Novice Class
Posts: 61
posted September 27, 2010 01:00 AM        
got it....
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BobC


Pro
Posts: 1736
posted September 27, 2010 04:30 AM        Edited By: BobC on 27 Sep 2010 11:32
quote:
the limiter is actually 10,600 rpm , the tach is off by 600 rpm.

Roy

10,600 you say? I've been using 10,800 in my calculations. Where did you get that figure from Roy ?

It's quite importanat for LSR as it makes around 4mph difference on 17/41 and 17/40 gearing.
____________
Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles

2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)

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Shane661


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posted September 27, 2010 07:45 AM        Edited By: Shane661 on 27 Sep 2010 14:47
Here you can see that on my bike, the limiter kicks in at about 10960 rpm:



I have heard that the ecu's can vary a tiny amount from the factory. As has been stated, the tachometer reads quite a bit higher than the actual rpm of the engine.

Shane

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BobC


Pro
Posts: 1736
posted September 28, 2010 01:20 AM        Edited By: BobC on 28 Sep 2010 08:35
Thanks Shane, on the dyno graphs (Dynojet 250) for my 14 the limiter kicked in at 10800, which is why I always used that number. Glad to say it worked for my calculations.

Maybe dyno's are only accurate to plus or minus 2% ?


____________
Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles

2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)

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Heavy AK


Novice Class
Posts: 61
posted September 28, 2010 06:51 PM        
now this makes me do a bit more thinking... BobC/Shane661. Your bikes are heavily modded to obtain 200+ but the bike still will only spin to about 10900 max. This brings me back to my goal of 190-192 mph. With my weight and mods (1451 kit, exhause, air filter and PCV) how likely am I to achieve this?

We have plenty of road so room isn't a problem up here...going with the stock gearing takes FOREVER for me to run out the gears. I figured that if I went with the 43 rear it will allow my bike to pull to the limiter in 6th and put me right about 190+...

I do a lot of highway riding up here...lots and lots of it to be exact which is why I was thinking of going with a Pirelli Diablo or Dunlop Roadsmart 200.

The bulk of my racing is against CBR 1000, GSX-R 1000, Busa and the occasional BMW 1000..




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shiphteey


Needs a job
Posts: 2463
posted September 28, 2010 07:01 PM        
quote:
now this makes me do a bit more thinking... BobC/Shane661. Your bikes are heavily modded to obtain 200+ but the bike still will only spin to about 10900 max. This brings me back to my goal of 190-192 mph. With my weight and mods (1451 kit, exhause, air filter and PCV) how likely am I to achieve this?

We have plenty of road so room isn't a problem up here...going with the stock gearing takes FOREVER for me to run out the gears. I figured that if I went with the 43 rear it will allow my bike to pull to the limiter in 6th and put me right about 190+...

I do a lot of highway riding up here...lots and lots of it to be exact which is why I was thinking of going with a Pirelli Diablo or Dunlop Roadsmart 200.

The bulk of my racing is against CBR 1000, GSX-R 1000, Busa and the occasional BMW 1000..






With those mods you can go 190-192 but 200 will be tough...especially in a standing start 1 mile. Normal sized rider just went 202 at Maxton on a 1464cc zx14. The problem you are going to face is your size...a small rider on the liters will get out on you. Have you had the bike tuned and if so what kind of numbers is it making?
____________
RnR Cycles
Loring: 229.6 mph (tailwind)
Bonneville: 201 avg, 208 (tailwind)
TX Mile: 200.2 mph (headwind)
Maxton Mile: 220 mph headwind (headwind)
Ohio Mile: 222 mph (spinning)
Street: Classified

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BobC


Pro
Posts: 1736
posted September 29, 2010 12:27 AM        Edited By: BobC on 29 Sep 2010 11:11
HeavyAK, you may be surprised, my bike is fairly standard engine-wise. Just secondary butterflies out, a pipe, a Power Commander with a custom map, air filter and a Speedo Healer. Stock wheelbase is popular with LSR riders, more weight over the rear equals less chance of spinning up at the top end, just a bit more wheely-prone at the start. The go-faster mods are 17/40 or 18/41 gearing, depending on conditions and careful attention to aerodynamics.

To maximise the potential of the bike I just had it strapped at the front, lowered at the rear and practised a good economical tuck. Obviously mirrors etc were removed too. Look at the photo above, that was taken just before the speed trap on a 203.1mph pass. I am leaning into the wind coming from the right to keep it on the track and apart from anything else notice where my left hand is. (or isn't).

I was 11mph quicker than a similarly modified 14 at that meeting. We compared finish line photo's, his bike was not lowered, he was not right down on the tank, his toes were sticking out and so were his elbows. You also have to sit very still once in position, any movement disturbs the air-flow and causes drag. Lots of practise helps if your doing LSR - and having a 2006 14 because everyone knows they're faster.

If your goal is 190-192 then a Speedo Healer and change to a 16 tooth engine sprocket (16/41) will do it on a ZX-14 and 17/43 will give you a couple more mph. Good luck with it, let us know if you make it.
____________
Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles

2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)

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shiphteey


Needs a job
Posts: 2463
posted September 29, 2010 04:19 AM        
Just remember at 275 lbs you pay a weight penalty early through the gears and an aero penalty because of your size at higher speeds. It will take work but it can be done.

A.
____________
RnR Cycles
Loring: 229.6 mph (tailwind)
Bonneville: 201 avg, 208 (tailwind)
TX Mile: 200.2 mph (headwind)
Maxton Mile: 220 mph headwind (headwind)
Ohio Mile: 222 mph (spinning)
Street: Classified

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Shane661


Needs a life
Posts: 11481
posted September 29, 2010 06:18 AM        Edited By: Shane661 on 29 Sep 2010 13:20
quote:
now this makes me do a bit more thinking... BobC/Shane661. Your bikes are heavily modded to obtain 200+ but the bike still will only spin to about 10900 max. This brings me back to my goal of 190-192 mph. With my weight and mods (1451 kit, exhause, air filter and PCV) how likely am I to achieve this?

We have plenty of road so room isn't a problem up here...going with the stock gearing takes FOREVER for me to run out the gears. I figured that if I went with the 43 rear it will allow my bike to pull to the limiter in 6th and put me right about 190+...

I do a lot of highway riding up here...lots and lots of it to be exact which is why I was thinking of going with a Pirelli Diablo or Dunlop Roadsmart 200.

The bulk of my racing is against CBR 1000, GSX-R 1000, Busa and the occasional BMW 1000..






My bike is stock motor as well. It is just light, which allows me to reach speed more quickly.

I have run over 190 mph on 17/43.

You should definitely be able to achieve the numbers you want...if you choose the right builder and have the right setup within the parameters that you have outlined. There are so many variablies that it is impossible to say "yes" to a given setup, without knowing all of the details.

It always comes down to setup, and practice.

Shane

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