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BIKELAND > FORUMS > DRAGBIKE ZONE.com > Thread: Tire Pressure at the Strip!!! NEW TOPIC NEW POLL POST REPLY
ZX12Girl


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Adrenaline Junkie
Posts: 1740
posted November 13, 2001 06:41 PM        
Sounds like you are exactly at the same level that I am.... I wanna lauch harder as well but I am having a hard time learning how to do it......

My problem may be that I am not in a hurry to burn up another set of clutch plates!!!!
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OzRed12


Novice Class
Posts: 34
posted November 14, 2001 06:50 AM        
Being aggressive

After watching a few of the better riders I found that they launch very aggressively compared to me. Tonight I did quite a few wheelies, quite high, yet rode them out and continued on the gas. I used to chop the throttle before, so I am becoming more aggressive as I get used to the bike in certain positions.

Kevin would launch and carry a wheelie a lot longer than I would, as he is more aggressive. I think practice is the only way to overcome whatever fear is still left within.

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kcadby


Pro
Posts: 1733
posted November 14, 2001 11:02 AM        Edited By: kcadby on 14 Nov 2001 11:49
No Fear...

I'd rather see people be a little timid while learning than a LOT HURT...
This would be one of my looonger wheelies (thank's for picture Mad Mike)...

Note that I am PASSING the ZRX on the rear wheel


Doing power wheelies like these don't bother me at all...in fact...it's my FAVORITE thing to do at the track...beside just plain going FAST...

OZ...your right...getting used to it (the bike) is the key to going faster...
CLUTCH CONTROL (slipping) is the key to NOT wheelieing too high during launch...I OBVIOUSLY didn't clutch it quite right on the above run but...IT WAS FUN

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MadMike


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posted November 15, 2001 05:03 AM        
there are some times when I see my shift light before my clutch is out!! Dought!!!! then Im looking for Dry Ice to cool my damn clutch down!!! I launch around 6 and im at full throttle right off the line, ive been watching my video's and notice as soon as im leaving im on full throttle! so that is what works for me.
mad mike
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entropy


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Posts: 8671
posted November 15, 2001 05:05 AM        
you ROCK, Mike

are you using 4 gears or 5???
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harryzx-12


Needs a job
Posts: 3643
posted November 15, 2001 02:18 PM        
I run 41psi unless it spins.If I spins then I'll lower the pressure Weight will sure give you traction.
I have been trying to launch at a higher rpm and slipping the clutch.I have been getting advice from Kcadby and dean,who are usually running the same days that I go.
I wasn't even doing a burnout the last 3 days i went to the track as it was so sticky.I would avoid the waterbox altogether and spin the tire enough to clean it off.
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krexken


Zone Head
Posts: 732
posted November 16, 2001 09:27 PM        
The few times that I've spun was when I was way too agressive right off the line. If it hadn't spun, it would've just wheelied anyway. If I was spinning downtrack, which I never have, I'd try lowering the pressure. I keep my 010 at 35. The tracks I run at are generally well prepared and almost always very warm.
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Lorcan


Expert Class
Posts: 327
posted November 17, 2001 04:20 AM        
The sprint tracks we run at here in the UK are old WW2 airstrips. Broken asphalt and concrete, grass, weeds and all. So we only run 10-12psi, and even then our ZX12 spins in every gear. I can't even take my turbo to these tracks, just to give you an idea I ran 9.67 on the 12 at our local track, Smeatharpe in Devon, last month and set the absolute course record!
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BA


Pro
Posts: 1592
posted November 18, 2001 12:48 PM        
Interesting thread 12RGirl.

Nothing like asking a bunch of guys for advice drag racing to get them to reply!

So, since I'm falling for it too, here's my thoughts.

btw....I weigh about 150 suited up.

I have always run between 32-38lbs of pressure at the track with my stock Dunlop 207. I've only spun TWICE and I think it was more about lack of clutch control than traction. I did drop it down to about 25lbs on one cool, dewey night.

I looked at your timeslips and, by looking at your 60'-1/8th times, I would say that you are not rolling into the throttle as soon as you could be. Nothing major, but you get *tenths* off ET by being able to roll in sooner down there.

I'm a big believer in "clutch management", and I don't say that to mean 'save the clutch'. Hell I ABUSE IT.
IMHO, being able to modulate your clutch lever in that TINY, TINY friction zone and not being afraid of the throttle is the complete key. You've got to make that clutch, and clutch lever YOUR BITCH!!!

I think that if you get 1.60-1.66 60' times on a stock arm'd 12R, then you're doing JUST FINE. So, you need a little work there, but the 1/8th mile seems to be off by a few tenths,....that's why I think you can roll into the gas sooner.
I know what your thinking too,...."but it power wheelies on me",...and you're right. You have two things to work through that.
1. slip the clutch out longer, keeping the RPMS up, keep the clutch tightly in the friction zone.
2. learn to 'walk' the throttle through the power wheelies. This takes practice, you can do it on the street too, every day. Soon you will gain a "feel" for how you can juuuust let off the throttle a little, when you feel the front end just start to come up. Let off just a tad, and as it comes down, roll back in that little bit, and get ready to shift to 2nd gear!
You might be able to see this on the video of my run.

PS. I run faster on no gas, vs a full tank. Always have. 6R, 9R, 12R. I think I launch between 4k and 5k on the 12R, but as soon as I'm 30' off the line, I'm trying to hit more like 7k - 8k. Slipping the clutch is the key.
I shift at redline as well. Your bike makes makes power all the way to redline with practically no drop off when it has a pipe on it. (vs stock)
MadMike may be on to something. Sure seems to me that your 100% throttle air/fuel numbers in the power commander will range from MINUS 10 - PLUS 5. (Not the +8 - +20 of some)


If you go every week, I have no doubt you'll get your 9.5 next year!

My apologies to all for babbling, guess I like to talk.
BA

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ZX12Girl


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Posts: 1740
posted November 21, 2001 05:50 AM        
Thanks BA!!!

That's awesome advice.....You can babble anytime....

I was sitting here thinking about what I do at the line and I think that I go slower with the throttle (acceleration) and save the clutch slipping!!!! After I burned up the first set of clutch plates, I was trying to be easy!!!

I guess that it not what gives you the great times.

I have no problem with riding out the power wheelies....Kind of fun!!!! That's the only time that I ever wheelie my bike!!!! (You can go faster on two wheel's )

That must be why I am faster on the Busa - (9.71)
#1 - I can leave at a higher RMP...so I am already at 3/4 throttle!!!!
#2 - It's the Hubby's bike so who cares if I burn-up his Clutch plates (lol...Don't tell him that I said that )

The one thing that I like about racing my hubby's Busa is that it seems more planted...not as much of a power wheelie monster....But I've gotta take the ZX12 out and see how fast she will go!!!

Thanks for all the advice guy's....I am always looking for something else to try...and you guy's are the reason that I am in the 9 second club...(I read every Drag Racing Thread) I think that different things work for different people so I try out what you guys suggest until I find something that seems to work for me!!! Thanks!!

Ok, now I am babbling!!LOL

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MadMike


Moderator
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Posts: 6579
posted November 21, 2001 04:18 PM        
something I have noticed

One thing I have noticed that the lighter the rider the higher the air pressure they can have, the old things at rest want to stay at rest! so someone like BA can run his tire at a higher psi, then some one like me. with the same setup and track conditions. just a little fyi, maybe everyone had realized this already and then im just alittle slow!!! and you know what then !@#$%$%!@ U. I think that is what Harry would say. LOL....
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ZX12Girl


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Posts: 1740
posted November 21, 2001 07:36 PM        
Well...I sure can't run a higher air pressure....What's up with that????


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MadMike


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posted November 21, 2001 08:02 PM        
Well maybe alot has to do with the track conditions, and what are the other street bikes running at your track? you should be able to have more air then them in your tire set up?
MM
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ZX12Girl


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Posts: 1740
posted November 21, 2001 08:15 PM        Edited By: ZX12Girl on 21 Nov 2001 20:16
Great Advice Mike....I'll start asking the fellow drag racers!!!!

Some of them are cool and some are kind of pissy losers!!!

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BA


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Posts: 1592
posted November 21, 2001 11:13 PM        
What is your burnout/tire heating technique???


you suuure you're getting it up to a good temp????????


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OzRed12


Novice Class
Posts: 34
posted November 22, 2001 01:11 AM        
weight

Mike, I thought a heavier rider would provide better traction due to more weight on the rear tire and therefore able to run on higher PSI. Please advise why a lighter rider can run with higher PSI, thanks.

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harryzx-12


Needs a job
Posts: 3643
posted November 22, 2001 04:43 AM        
Mike did you have a brain fart?

Oz, I think Mike may have been momentarily CORNFUSED! The heavier the person the more pressure they can run in their tires? I usually don't have to lower my tire pressure at all due to my weight.More weight on the tire = less wheel spin,Right or am I CORNFUSED?
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ZX12Girl


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Adrenaline Junkie
Posts: 1740
posted November 22, 2001 06:16 AM        
I am a little confused also...
I thought that

heavy = more air
light = less air

but that was still good advice to ask other drag racers...

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