Learning2race
Expert Class
Posts: 138
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posted February 15, 2009 06:33 PM
1/4 mile help
Here are my last two time slips:
R/T .106
60' 1.675
330 4.283
1/8 6.410
MPH 115.38
1/4 9.838
MPH 139.86
R/T .074
60' 1.629
330 4.232
1/8 6.352
MPH 115.85
1/4 9.759
MPH 143.38
I realize that the start is critical to final time/speed. I was having trouble after the launch not getting to wide open throttle quick enough so I invested in a 2-step. I stage at 6500RPM with the clutch held at the point of engagement. At the light I dump the clutch; the throttle is wide open due to the 2-step. I leave with the front tire up but nothing too severe. The rest of the run is fairly simple from that point forward.
I'm not sure that I can leave any harder without pointing the front skyward, so I am confused about my 60' times. The members on here making good times are in the 1.4 - 1.3 second 60'.
The aftermarket toys on my bike should allow me to get there (stretched to 64", lowered, strapped, 2-step, SMEG with mapping) so I'm left with my weight vs. gear ratio to contemplate. I walk around at 230lbs so I'm guessing about 245-250 suited. Current gearing is 16 front with 45 rear. Do I need to inrease the rear to 46 or 47 to get off the line faster and if I do, how much will this impact my final trap time/speed?
I know that it's a poor racer who relies only on his parts, but I'm looking to optimize the bike while I develop my personal racing skills.
Thanks in advance for your feedback.
  
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Bently
Needs a life
2012 14r In Blue and no Mods!
Posts: 5428
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posted February 15, 2009 06:43 PM
Well I don't know what others say but I say get rid of the two step and learn to launch and I'm not saying that to be a smart ass and I am far from the best on here but I go 1.45 60fts with no two step at 62 inches and run 9 teens at 218 unsuited on pump gas. I never understood the two step unless your running wheelie bars. I think I can go 9 0's 0r an 8.99 with a rear gear change as I'm only 1 down in the front.
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kaw-rick
Pro
Posts: 1167
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posted February 15, 2009 06:46 PM
You should go a .30 or .40 easy. Im not sure what the problem is. Please list all mods, dont see nothing wrong with the mods you have listed so far, but somethings a miss.
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06redzx14
Pro
Posts: 1022
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posted February 15, 2009 06:52 PM
where are you located? where are you shifting? air shifter? with those 60's I run .50s-.60s in Louisiana/Texas me and the bike with 3 bars of gas weigh in at 780
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06 alien head, no flies, PC+hub, 16/45 44 43, air shifter, dry shot
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Learning2race
Expert Class
Posts: 138
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posted February 15, 2009 07:00 PM
I'm located in Vancouver BC, Canada. IKm racing not too far away soi would say that effectively I am at sea level. Shifting is via CO2 plus ram.
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kawasakijockey
Pro
Posts: 1876
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posted February 15, 2009 07:03 PM
Disconnect the 2step and learn the clutch. You need to be in the mid 1.50's on your 60ft. You can get lower from there. The 330 is at least 2 tenths and the 1/8 is 3 tenths behind where you could be. Your mph in the 1/8 is at least 5 slow. You have to be bogging real bad, not holding wide open, or extremely slow shifting. You really dont need anymore gear.
____________
Get on the shortbus boys 'cause its time to get schooled.
2007 ZX-14
1.38 60ft
9.03 @ 149mph
8.95 @153 small shot n2o
8.68 @160mph 5lbs boost
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Bawls
Needs a job
re-learning to ride
Posts: 2701
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posted February 15, 2009 07:16 PM
my last trip to the track on my 07 with just bones, a strap, a 16t front sprocket and no flies was yielding almost the exact same times as yours and i never got a real clean pass. i'm putting down 1.58 60fts, 4.2x 330'| and 6.40 in the 1/8th. i'm also running at over 4000ft da's though.
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Best 60ft: 1.42
Best 1/8th: 5.97
Best 1/8th MPH: 119
Brockland Police Badge # 001
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smokinZX14
Needs a life
Posts: 10197
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posted February 15, 2009 07:34 PM
Ok i'm a bit lost here or i'm missing some info ... OK you stage at 6500 , the light comes down and you DUMP the clutch and the motor goes wide open throttle ... I get the two step part because i had one on my Car .... But on my bike if i had the throttle wide open and DUMPED the clutch one of two things are going to happen ....Flip the bike or blow off the tire ... I know you can use a two step with a slider clutch and wheely bars but i fail to see how you could use with a street tire and no bars.. Do you have any videos of this ? That might help us to understand what is going on ..
____________
Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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Bently
Needs a life
2012 14r In Blue and no Mods!
Posts: 5428
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posted February 15, 2009 08:02 PM
Smokin I agree, I have a buddy that runs a 2 step on his busa with no slider or bars but he don't dare dump the clutch! it gains him nothing in time just easy to hold at set rpm but he has to release the clutch and get on the gas the same as if he did not have it. a waste to me but i can hold a steady rpm.
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ninja12
Needs a job
Posts: 3310
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posted February 16, 2009 12:43 AM
Dumping the clutch at 6500 and going WOT with 15/45 should result in a nasty wheelie , spin, or very good 60'. I'm going to guess the clutch is slipping bad. When was the last time it was checked?
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted February 16, 2009 08:39 AM
If I dumped the clutch at that rpm I wouldn't wheelie I'd flip straight over right there! Lol prob would never make it to the 60ft mark!
____________
Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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Bawls
Needs a job
re-learning to ride
Posts: 2701
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posted February 16, 2009 08:50 AM
I would probably spin in one spot until it grabbed and threw me into the tree lol
____________
Best 60ft: 1.42
Best 1/8th: 5.97
Best 1/8th MPH: 119
Brockland Police Badge # 001
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pazx14rider
Zone Head
Posts: 953
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posted February 16, 2009 09:33 AM
look at his 1/4 trap speed very low i did a pass 9.68 at 149mph doesnt make sense about the same 60ft time as me
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NINJA12
Needs a job
Posts: 3310
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posted February 16, 2009 11:44 AM
quote:
If I dumped the clutch at that rpm I wouldn't wheelie I'd flip straight over right there! Lol prob would never make it to the 60ft mark!
I did says nasty wheelie.
It would make it to the 60 with or without you in the seat.
Maybe a little sparkle show for the crowd. 
Seriously there is likely something going on with that clutch.
Be careful if you get the clutch to hold, you will have to lower your lauch RPMs.
Keep us posted.
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rACeRs
Expert Class
Posts: 413
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posted February 16, 2009 01:01 PM
I would guess its a very badly slipping clutch. That would be the only way your launching it that high and going full throttle right off the line, or it is bogging down really bad. But even when I bog my bike off the line it will still mph in the 148's. If you have the know how pull the clutch and inspect it. Your mph is really low, even for your weight. I am right around 210lbs unsuited and at sea level. Do you have any idea what your DA is when your running?
____________
tiwinder, lowered and strapped, pc5 w/ brocks pump map, 40t rear
9.1 @ 149 w/ 1.57 60' SWB
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Learning2race
Expert Class
Posts: 138
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posted February 16, 2009 02:21 PM
The timeslips were from the end of last season - my local track is not yet open. Sorry no video to evaluate. Further sorry, I have no idea what"da" is?
The clutch is relatively new - I'm guessing less than 50 passes and some street riding. The front end does come up quick, but I throw my weight forward to start and that prevents a dangerous wheelie.
Two thoughts I've had since my original post:
1 - perhaps dumping the clutch is adding to my poor start. I thought that by being at WOT that the motor would pull through, but perhaps I still need to feather it out.
2 - I had my bike on a dyno during a dealer promotion last summer. It showed a very linear torque curve up to approximately 9700RPM whereupon it started to level of. As such I have been shifting at 9700RPM in the thought that I would be best served to stay in the powerband - am I loosing time/speed by not taking it up to 12000?
Thanks again
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Shane661
Needs a life
Posts: 11494
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posted February 16, 2009 02:23 PM
 Edited By: Shane661 on 16 Feb 2009 22:25
Are you sure the bike is not spinning the tire?
With 16/45, no 2-step, leaving at 4500 rpm, and not even close to wfo....I can stand my 64" bike up.
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Learning2race
Expert Class
Posts: 138
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posted February 16, 2009 02:39 PM
Rear tire is at 18-20lbs. I've only spun once which was entirely my fault for lining up on a poor surface.
Looks like it's time to ditch the launch limiter and learn how to use my wrist!
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smokinZX14
Needs a life
Posts: 10197
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posted February 16, 2009 03:31 PM
quote:
The timeslips were from the end of last season - my local track is not yet open. Sorry no video to evaluate. Further sorry, I have no idea what"da" is?
The clutch is relatively new - I'm guessing less than 50 passes and some street riding. The front end does come up quick, but I throw my weight forward to start and that prevents a dangerous wheelie.
Two thoughts I've had since my original post:
1 - perhaps dumping the clutch is adding to my poor start. I thought that by being at WOT that the motor would pull through, but perhaps I still need to feather it out.
2 - I had my bike on a dyno during a dealer promotion last summer. It showed a very linear torque curve up to approximately 9700RPM whereupon it started to level of. As such I have been shifting at 9700RPM in the thought that I would be best served to stay in the powerband - am I loosing time/speed by not taking it up to 12000?
Thanks again
You need to shift at 11200 ( Tac reading ) just before the rev limiter kicks in .. That will help with your MPH ... 11200 is really 10600 but the tac will show 11200.. 9700 is way way to low ..
____________
Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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Shane661
Needs a life
Posts: 11494
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posted February 16, 2009 04:08 PM
Yeah, 9700 is probably like 9400 actual!
I shift somewhere in the 11200-11300 range.
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rACeRs
Expert Class
Posts: 413
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posted February 16, 2009 04:24 PM
DA is density altitude. It will tell you how good your air is. Its not just about the elevation your running at. Google it and you will find some good info on it.
____________
tiwinder, lowered and strapped, pc5 w/ brocks pump map, 40t rear
9.1 @ 149 w/ 1.57 60' SWB
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted February 16, 2009 05:45 PM
Here at our local track my mph stock gears lowered and pipe was 145.. Here that's very close to average for bikes with same setup. I know he's a looong way away from ga but our times aren't very far off.
____________
Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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