KZScott
Needs a life
high on speed
Posts: 7235
|
posted April 07, 2012 03:53 AM
 Edited By: KZScott on 7 Apr 2012 11:53
stock trans hp limit?
in a "grudge" type chassis with a fairly heavy combo bike and driver, whats the limit of the stock gears with a back cut by R&D? when do I have to worry about breaking them? 300hp? 400, 500?
00 12R
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
  
|
Paul2281
Expert Class
Posts: 147
|
posted April 07, 2012 05:16 AM
Steve Rice would be a good guy to ask...He runs a ZX motor in a turbo funny bike with a big ass car tire on it....www.stevericeracing.com
|
woppi
Pro
Posts: 1362
|
posted April 07, 2012 11:21 AM
kzscott
my friend runs a stock gear --- zx12r turbo ---- 530 hp
without any problems !
____________
1st TFA Member / Austria !
" if it has wheels or titts - sometimes you will get troubles "
2000 Limited ZX12R NOS
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted April 07, 2012 12:37 PM
I thought Steve ran the ZX-11 motors
thanks Woppi, im not sure how much load hes going to have in 1st compared to this though. but im going to guess were only going to be 250 ish in 1st anyway.
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
|
Paul2281
Expert Class
Posts: 147
|
posted April 07, 2012 04:03 PM
Ya,I said a ZX motor(ZRX,ZX11,ZX12), but he knows all about any ZX trans`s....
|
dougmeyer
Needs a job
moderated
Posts: 2713
|
posted April 07, 2012 07:41 PM
Scott, Tranny issues are largely dependent on shock loading, not max power (up to a point of course). When you get up there in steady state power you actually start to have case strength and flex issues which may cause gear failure. The gears themselves are really strong, and remember the higher the gear the less the torque multiplication.
With a slick and a bar you will eventually find the limit of the trans of course. If you go with the good gearbox you might not ever get there.
'm pretty familiar with Steve Rice's ZX-11 funnybike which was always 500+ hp and it did not have a stock trans. It was probably a 3 or 4 speed anyway. With the 8" tire and bar it would often not drop the front tire until the lights.
____________
It's not that I think you're dumb, it's just that so much of what you know isn't true....
|
Paul2281
Expert Class
Posts: 147
|
posted April 08, 2012 05:23 AM
quote:
Scott, Tranny issues are largely dependent on shock loading, not max power (up to a point of course). When you get up there in steady state power you actually start to have case strength and flex issues which may cause gear failure. The gears themselves are really strong, and remember the higher the gear the less the torque multiplication.
With a slick and a bar you will eventually find the limit of the trans of course. If you go with the good gearbox you might not ever get there.
'm pretty familiar with Steve Rice's ZX-11 funnybike which was always 500+ hp and it did not have a stock trans. It was probably a 3 or 4 speed anyway. With the 8" tire and bar it would often not drop the front tire until the lights.
X2....Unless you put a slick and bar on it I doubt you`ll ever max out the trans with your current setup....Even the one Mark(R&D) built you is stronger than stock....
Good luck.....
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted April 08, 2012 10:59 AM
Edited By: KZScott on 8 Apr 2012 19:01
thanks Doug. this bike will be a max of 76 in (probly shorter do to traction issues) and runs the 7in MT(actual contact is 6.5in). the shock has been revalved and resprung by Trac Dynamics. it will not be getting bars or a wider slick, but it is on a 2 step, which must have some "shock factor" ?. the stock gears were cut by R&D. it has never popped out of gear, but the process of the back cut as we all know does remove material, which makes me think weaker (maybe very very little). Mark did tell me they use smaller cutters than most which means a smaller radius is required to maintain more material(and strength). we have been pounding on the trans since 08 and it looks great, but a 1287 with a 55 shot wont really compare to 20 lbs of boost 
my trans has a bunch of billet stuff so Im not as worried about mine
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
|
dougmeyer
Needs a job
moderated
Posts: 2713
|
posted April 11, 2012 06:44 PM
Since '08 you say? Well, I missed that part. Everything is going to break eventually. It's a matter of cycles. If you keep using it, sooner or later it's gonna break. You may never use it that long, and it might not "ever" break.That just means you didn't get to the max cycle point.
____________
It's not that I think you're dumb, it's just that so much of what you know isn't true....
|
ZRXDean
Needs a job
Posts: 2225
|
posted April 12, 2012 06:54 AM
Here's 3 years of land speed abuse on a stock ZX10 trans. That's half of 4th gear there in the pan.
|
Shane661
Needs a life
Posts: 11494
|
posted April 12, 2012 02:45 PM
JB Weld?
|
Paul2281
Expert Class
Posts: 147
|
posted April 12, 2012 06:06 PM
Could have it Magnafluxed at the end of the season and repair/replace.....
|
psycho1122
Pro
Posts: 1608
|
posted April 24, 2012 05:41 AM
Edited By: psycho1122 on 24 Apr 2012 13:42
I lost 3rd. gear doing laps on a road course (Trackdays). Having the OEM dogs undercut was my first mistake. At the minimum, should of REPLACED second and third after it started to jump out of gear instead of having them re-undercut (they are factory undercut).
Replaced 2nd and 3rd with Billy Robinson's Billet "Closed Window" gears.
http://robinsonindustriesinc.com/html/kawasaki.html
Running 90% of the course in third did not help, especially with a very torquey 1270.
____________
You say PSYCHO like it's a BAD thing!!
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted April 24, 2012 12:36 PM
who cut your gears?
(i have those billet ones in mine)
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
|
|
|
HOME
NEW TOPIC