KZScott
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posted March 25, 2009 02:59 PM
68 in WB or more?
hey guys, is there much use going over a 68 in WB? I know Pat runs his 14 at about 69, Heath runs 68 ect. if you had the option of 8 in of adjustability, what range would you go for? the main purpose is drag, LSR second, street 3rd. Im looking into having my arm done by Larry Hardcore. he can put the max adjustment to 20 over, but im thinking i want to keep the max around 68-69 to still be short enough for lsr ect.
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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
  
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Shane661
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posted March 25, 2009 03:09 PM
 Edited By: Shane661 on 25 Mar 2009 23:11
Based on 60' and 330' times I hardly see a need for more than 64" on a stock motor bike. Even factoring in your spray, I'm sure 68" will be plenty long enough.
Not taking anything away from the guys who run more than 64"...I'm sure the longer bike is easier to ride.
Shane
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KZScott
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posted March 25, 2009 03:18 PM
my bike was very wheelie prone at about 65.5(with ballast weight), a lot of that was me being inconsistant with the throttle and pulling my feet up too fast... so easier is better to make up for lack of skill/practise 
____________
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
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Shane661
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posted March 25, 2009 03:19 PM
If you get the 20" over you could always make the switch to hillclimbing as well.
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KZScott
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posted March 25, 2009 03:23 PM
LOL
i was thinking mayyyybe 70 in max IF there were gains to be had over 68. at 77 i think i would want a flat slick 
____________
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
|
almost_les
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posted March 25, 2009 03:55 PM
Edited By: almost_les on 25 Mar 2009 23:56
68 shoud be plenty. im looking at getting my spare arm stretched to a 6-12. should be more than enough for what i have planned (hint hint...)
look at heath, he's as quick as you on a stock spec motor and hes at 68". you can always sell it and go longer if 68 still doesn't work. besides, 68" is kinda the standard for badass bikes
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NOX
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posted March 25, 2009 04:22 PM
I would not go past 68.........
Unless you can run on only national event prepped tracks......
it works for some at 70 and 72, but not at all tracks......., you need something that will work everywhere........., or at least everywhere you run.......
take into account the places some guys race at when they tell you what works for them.......
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almost_les
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posted March 25, 2009 04:27 PM
quote:
I would not go past 68.........
Unless you can run on only national event prepped tracks......
it works for some at 70 and 72, but not at all tracks......., you need something that will work everywhere........., or at least everywhere you run.......
take into account the places some guys race at when they tell you what works for them.......
good point. traction is really gonna come into play at that length
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Shane661
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posted March 25, 2009 04:31 PM
Scott, what is your ET goal on motor?
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ninjaboy311
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posted March 25, 2009 04:53 PM
I have mine at 69" for a few reasons:
1) Bracket race 99% of the time, and I want to be as consistent as possible every pass with no worry of wheelying.
2) 99% of the tracks I race at are prepped well enough to allow it.
3) My suspension is set up ideally for the extended wheelbase
4) Running the Michelin Power Race Soft and it sticks like glue.
67-69" is what I would shoot for.
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KZScott
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posted March 25, 2009 07:12 PM
thx for all the input guys. i think ill go with my original plan of a Doug Ray(Spencers) arm. 4-12. checking out the other guys showed a few extra fees, Doug has the best deal.
Shane, 8.89. my best motor pass was a real soft launch. 1.60 60ft. im hoping to drop them to 1.35s
____________
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
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NOX
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posted March 26, 2009 04:56 AM
You will fly this year..........
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42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
Conway Cycle
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ninja12
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posted March 26, 2009 07:18 PM
you already know 65 was not enough,
To make full use of you options, I'd leave room to go out to 70".
Think you would ever want to go less than 62? 62-70" covers most serious racing.
I'm sitting at 68" and will ride on the street regularly.
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KZScott
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posted March 26, 2009 07:36 PM
hmmm. not sure if my track would hold a nitrous pass at 70 now that i think about it....and at 70 i would really need the under bracing, more cost....
doc, is my 60 ft goal easily reached with 68 in, revalved/sprung shock, strapped, 2 step, and the single stage? i gotta get the local record back from the 14 guy....
____________
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
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Shane661
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posted March 26, 2009 07:37 PM
Scott, are you planning on 11" over stock without underbracing?
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KZScott
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posted March 26, 2009 09:52 PM
yeah, same as Nox. i know the launch will be ok(he seems to be doing ok anyway), Doug told me under 275hp on the launch with a street tire bracing is optional. the launch is the most stressful to the arm, and that will be on motor(at least the first 30 feet or so anyway). the progressive system shouldnt be completely on until second gear when theres isnt as much stress on the arm. factoring that in he though 285hp or so would be ok. i can allways get a buddy to tig on some bracing later if i feel its needed. for way less than Doug.
remember, Karl was launching with 230+hp on a 10 in arm and did well
____________
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
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Shane661
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posted March 27, 2009 05:00 AM
Edited By: Shane661 on 27 Mar 2009 13:00
I guess it all depends on what you are comfortable with. Going 11" over without any bracing is definitely compromising the torsional rigidity of the arm, but it sounds like you are aware of that.
I decided not to go that route after speaking with McIntosh.
Shane
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NOX
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posted March 27, 2009 07:39 AM
quote:
hmmm. not sure if my track would hold a nitrous pass at 70 now that i think about it....and at 70 i would really need the under bracing, more cost....
doc, is my 60 ft goal easily reached with 68 in, revalved/sprung shock, strapped, 2 step, and the single stage? i gotta get the local record back from the 14 guy....
yes, but i would not use the two step......., , you wont need it........just spray about a half second into the run.,and low 1.30s will be there..........
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
Conway Cycle
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aliveagain
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posted March 27, 2009 08:00 AM
I asked MacIntosh about the bracing and they said you really don't need it.It is just a personal preference.Grudge bikes don't use them.
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I wondered why the baseball kept getting bigger. Then it hit me.
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Shane661
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posted March 27, 2009 08:02 AM
Edited By: Shane661 on 27 Mar 2009 16:09
quote:
I asked MacIntosh about the bracing and they said you really don't need it.It is just a personal preference.Grudge bikes don't use them.
Did he tell you that about stock arms? He told me had a 9" over stock arm twist badly and he wouldn't do stock arms that length without the bracing...
I'm not even sure if he will do stock arms anymore...
Shane
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KZScott
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posted March 27, 2009 08:22 AM
what was the stock arm off of that twisted Shane? what was the bike setup like?
____________
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
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Shane661
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posted March 27, 2009 08:29 AM
Edited By: Shane661 on 27 Mar 2009 16:31
quote:
what was the stock arm off of that twisted Shane? what was the bike setup like?
I'm not sure, Scott. Terry just told me that the stock arms were pretty thin, and he had that one twist, and he wouldn't go that long on a stock arm without bracing.
Maybe he has changed his opinion now, I don't know.
Like I say, it's whatever you feel good about. I try to be conservative when it comes to reducing the strength of key components. I'm not saying one way is right or wrong. But I can look at the mechanics of a long stock arm and tell you with 100% certainty that rigidity has been sacrificed. I'm sure you would agree.
Shane
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KZScott
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posted March 27, 2009 08:46 AM
yes i would agree, but im undecided on if its enough to twist one with my setup. im thinking about getting a cross brace made in front of the front of the adjustment right off the bat. pretty much copying the arm thats shown on Dougs turbo bike. im going to try and incorporate a nitrous bottle bracket into the design to try and kill 2 birds with one stone. i feel the cross brace would effectively make the unbraced section act about 4 in shorter.
your opinions?
____________
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
|
Shane661
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posted March 27, 2009 08:50 AM
That would probably help a lot, Scott. Also keep in mind that you are planning to run this bike over 200 mph. Depending on the LSR track, there could be additional loads placed on the arm. For example, at Maxton you need to take take some slight bends...one of them in excess of 180 mph.
Shane
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KZScott
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posted March 27, 2009 09:18 AM
i would definately be at the shortest range of adjustment for lsr. 4-5 in with a cross brace should be fine for sideways forces put on the arm during turning. Karl ran his 10 in arm at Maxton right?
____________
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
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