posted May 05, 2004 08:02 PM
Lowered, geared 1/4 mile results If you haven't been following my story, here's the run-down:
I'm 185 lb nekid.
Stone stock, I ran 10.40 at 139.5 mph.
I installed 4" lowering links, strapped the front, and went to a 16 tooth front sprocket. No mod's have been made to increase the power.
Tonight, I ran a best of 10.06 at 144.9 mph. This was with a 1.78 60' and it did 115.1 in the 1/8th.
I ran a better 1.70 60', but the bike only ran 10.16 at 139 on that pass. Must've screwed something else up.
Anyway, the best pass was cold, off the trailer, with no practice. It just slowed down after that to an average of 10.10 at 143 mph.
I'm still pissed because the "old school", air-cooled, Paw-Paw bike Bandit 1200 that I JUST SOLD for a measly $3300 ran a best of 10.18 with stock gearing.
posted May 05, 2004 08:50 PM
Edited By: engineermike on 5 May 2004 21:52
quote:yea but the bandit wasn't stock was it?
How'd you guess?
Seriously, though, it had a stock head and exhaust cam. . .
Pipe, jet kit, GSXR1100 intake cam, and 1216 cc's. . . 139 rwhp and 90 rwftlb. The motor was over and done with at 10,000 rpm though.
I haven't dyno'd the 10 yet, but I suspect it will do well since I pulled 145 mph with a 185 lb rider. It just doesn't have the mid-range torque like a 'Busa, or even the Bandit to get a good 330' time.
posted May 06, 2004 04:20 AM
Edited By: salsa1 on 6 May 2004 07:23
Hi mike;
Ya know you can try some MR9 fuel, or different gearing. guy doing 9.46 from another ZX-10R site shared that with just one tooth change up front (16) he was hitting rev limiter in fourth gear 30 feet before lights at end of 1/4 mile and is going to experiment with 15 & 41 or 42 rear combo (stock is 17 & 39).
So I take it you are just momentarily at a stand still; more strategies left to try right? I assume you also know you can get swing arm extension from Spencer inc. if you decided to go that route.
You did good I think for not even a slip on.
Have fun,thanks for sharing .
you are ahead of me at this point and I suspect a few others which look forward to getting ZX-10R into the nines.
posted May 06, 2004 04:42 AM
Where you from Mike?there is a town called Paw Paw not far from me that has a kawasaki dealership staffed by lying little pricks
posted May 06, 2004 05:25 AM
1.78 60ft? on a bike that is lowered 4" and strapped in the front? How many rpm's are you launching at?
____________
chitty chitty bang bang
posted May 06, 2004 06:17 AM
Thanks, salsa (I think)
I'm going to get a 15 tooth front sprocket today.
I tried several different launch techniques. Some launching at 5000 and coming of the clutch quickly, which netted the best times. I also tried launching at 8000 and slipping the clutch more, but it slowed a tenth.
The problem is that coming of the clutch quick at 5000 puts the engine below its happy range, so the -2 front sprocket should help. When racing 9.60 bikes, they would pull ahead between 60' and 330'.
posted May 06, 2004 06:20 AM
Nice times Mike...You make it seem like the bike is slowing down?...What RPM you launching at, are you foot shifting, the more YOU DragRace the faster YOU will get...
____________ Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
posted May 06, 2004 06:37 AM
Edited By: salsa1 on 6 May 2004 07:49
I am an Electrical Engineer thus the mechanical Engineer remark as a joke. You are just getting started so like Arnold says "I'LL BE BACK" corny hehe .
I know that my ZX-10R shows significantly more power when cold ram air is available. Just wonder what temperatures you worked with and what delta (T) occured as day progressed.
Going by what you are reporting stands to reason first pass was coolest of day and you got best time. As you got better launches (1.70) the day had warmed up some and expected improvement may have been nullified (less power). Fair theory I think.
Keep on trying... 15 front may require 41 or 42 rear and then 5th gear will be used.
Can't prove as best or done the math yet but thats what guy doing 9.46 thinks he should try. Just passing info to ya.
Let me know how it goes....
posted May 06, 2004 10:31 AM
Edited By: salsa1 on 6 May 2004 13:33
Hi rubber pants :
Only posing possible theory to Mike. He can say whether day got warmer (normally does) as he went from first pass.
Surley more practice is in order especially on a short wheelbased bike.
Basically cooler air is denser than warm air ;more oxygen into engine translates to more power at all speeds. Also 145mph only occurs at end of 1/4 mile not during most of 1/4 mile.
The following is a quick article I found. SEE LAST PARAGRAPH. Wind force is not only factor at play to take advantage of a ram air system. Not sure if ignition timing is varied on ZX-10R relative to air temperature, (would hope so on such a high tech. bike) ;could find out or verify if I tried; no big deal really if you know who to ask or where to look.
Have fun!
How Does Ram Air Make HP?
This is a question we hear a lot. The answer is really quite simple and founded in science. A motor is really an air pump. The idea is to get as much air in and out as quickly as possible. However, stock motors actually do not take in as much air as their displacement indicates. This air comes into the motor under vacuum and is assisted by the weight of the atmosphere pressing down (barometric pressure). This process is not very efficient. This ratio of actual air entering the motor versus the actual displacment of the motor is called volumetric efficiency V.E.
A typical stock fuel injected motor is rated at about 85 % V.E. This means that out of the 346 cubic inches of air your motor could theoretically take in, only 85 % of that volume enters the cylinders. This translates to about 294 cubic inches of air. Some all out race motors can reach 100 % VE and supercharged or turbocharged motors actually exceed 100 % by forcing the air into the motor. Not everyone can afford a supercharger but there is definately room for improvement for the stock motor if you make it easier for it to get air into the motor for combustion. This is what ram air does.
As speed increases, the air entering through the sealed ram air kit actually becomes pressurized. This positive pressure helps to fill the cylinders more efficiency and raises the VE of the motor. As the VE increases, the motor becomes more efficient and produces more HP and also gives you better fuel economy. You will also find your throttle response dramatically improved. The motor is working less hard to fill the cylinder and is greatly assisted by the high pressure air. The faster your go, the greater the pressurization effect. This is similar to a mild supercharging effect.
The second benefit of a ram air system is that is supplies the engine with colder air than what it would normally breathe. Colder is more dense and contains more oxygen for the combustion process. For every 10 degree drop in intake air temperature, you can expect 1 % more HP. The ram air kit supplies cold air from the bottom of the car which is forced into the sealed air box. Unlike the stock system, the ram air kit does not let the motor breathe superheated air from the engine bay. Additionally, the computer detects this colder air and adds additional ignition timing. This makes more HP!
posted May 06, 2004 01:33 PM
hey mike thanks for the update i want to drag my blue zx too spencers out of the tie down brackets do you think a whieelie bar would help or is that not a factor? thanks again your post always gets my dawg ears up
posted May 06, 2004 02:33 PM
Edited By: engineermike on 6 May 2004 15:57
The temperature actually dropped as the evening went by. It slowed down maybe 1 mph through the runs, probably due to engine or clutch heat.
I picked up a 15 tooth front sprocket today and I'll be installing it tonight.
Wheelying is not a problem once the clutch is fully engaged. Of course, if you rev it to 10k and drop the clutch, it'll flip over backwards.
I'd say the biggest problem with dragging the bike is the lack of low-end and mid (as compared to the GSXR1000), combined with an exceptionally tall 1st gear.
I got beat by a girl on a GSXR1000 last night who ran 9.60 at 143 to my 10.09 at 144. I think it's saying something that I'm 40 lb more than her and still pulled 1 more mph. We ran the same 60', but she pulled out between 60' and 330'. From there it was even.
posted May 06, 2004 03:05 PM
I would monitor my engine temp.Some motors as they get hotter loose considerable power.Doing back to back passes will also build alot of heat in the clutch pack.If you would let us know the engine temp at the line along with the 1/4 times maybe a cooler thermostat is in order.
posted May 06, 2004 04:40 PM
Hey Mike, The bike slowed down due to heat???...Comeon Man, when I go to the MIR test/tune Seminars I do 3 back to back runs and get faster and sometimes slower because I screw up!!!...That girl on the Gixxer beat you because she TWISTED THE THROTTLE more than you did!!!
Mike you need alot of seat time, the more the faster you go and more consistant you get...Dont take it personal, your ability needs to catch up to your ZX10s ability!!!...I wish my ability was the same as my ZX12s, then I would be going 9.40s, almost there, but not quite yet!!!
Your right about the low/mid range power on the 10, same goes for the 12...Soo, then you have to compensate for that by launching at a little higher RPM then the Suzukis...Thats what makes Kawasakis harder to ride, due to the fact of sliding the clutch a bit more than Suzukis!!!...Thats why the Busa and Gixxer1000 will always show a faster 330 than the ZX12 and ZX10s, but Kawasakis make more HP...Thats why we always have more MPH in our ETs...
posted May 07, 2004 05:14 AM
Edited By: salsa1 on 7 May 2004 07:02
Glad to see an Engineer making life better for the rest of us by pioneering on uncharted waters.hehe. Thats what God made us for....
Hey mike ;it is valuable to see what difference going to 15 front will do with ZX-10R; I wonder however if 16 front and 38 rear will work as well for 9's ;chain life would be compromized less.
I will most likley opt for set up that gives results without having to purchase a different chain Will wait for your results; you da man.
posted May 07, 2004 11:23 AM
That bit on "how ram air makes hp" is more sutable to an automotive application.
These modern bike engines are running well into the 90% ve range thruout much of the rpm band and actually run a VE well above 100% at and around the peak torque.
On the zx12r at 7500 rpm the engine is way over 100% ve.
I'm sure the zx10r is well over 100% ve at its peak torque.
posted May 07, 2004 12:17 PM
good 60' time don't always equal good 330' times.
If you jump out the hole Great 60' , but killed the motor
your 330 will suffer. same result when you wheelie because you stop twisting the throttle.
Best 330 comes from DRIVING thru the 60' hard into the 330'.
330' is the ticket to better ET's. remember the all important 1-2
shift is in the 330. It must be ON-TIME and CLEAN with the throttle fully locked.
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posted May 05, 2004 08:02 PM
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