engineermike
Expert Class
Posts: 101
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posted April 14, 2004 09:40 AM
ZX-10R quarter mile times:
A somewhat confusing and inconclusive night at the dragstrip netted the following:
10.47 @ 142.1 Right lane
10.40 @ 148.2 Right lane
10.50 @ 144.1 Right lane
10.43 @ 138.9 Left lane
10.50 @ 138.2 Left lane
10.43 @ 148.3 Right lane
All 1/8 mile mph were between 111.0 and 112.5 mph.
Speeds sound a little screwy, so I don't know what to believe.
Any input?
I'm 180 lb.
Mike
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'04 Orange 10R
  
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AnotherRedHead
Expert Class
Posts: 348
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posted April 14, 2004 10:42 AM
148 is crazy high MPH.....doesnt sound right. Ive seen a zx10 at the track here, runs 112 or so 1/8th mile. Sounds right. I know that bike will run 9.90s stock, just let me ride 
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your car is slow
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posted April 14, 2004 11:28 AM
37mph on the back end? yeaaaa right.
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AnotherRedHead
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posted April 14, 2004 12:08 PM
 Edited By: AnotherRedHead on 14 Apr 2004 13:08
31, maybe.....
are you sure the 8s werent 3s?
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engineermike
Expert Class
Posts: 101
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posted April 14, 2004 01:50 PM
I'm positive the 8's weren't 3's.
I attributed the 37 mph gain to an especially screwy first half (slip clutch, bog, wheelie. . .)
I had already shifted 4th before the end of the track.
Mike
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'04 Orange 10R
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your car is slow
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posted April 14, 2004 02:08 PM
Edited By: your car is slow on 14 Apr 2004 15:09
eh...37mph on the back end of the track has nothing to do with you bogging or wheelies....bikes just dont do that kinda power stock and NA. Not to mention if it were terriblly impacting on your run..your 8th mph would have been just as impacted...but you claim its the same.
Its not that I dont believe a 10R would pull 148 in the 1/4...its that I dont believe it would with only a 111/112 mph in the 8th.
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CrotchRocket
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Bracket Racing with Betsy
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posted April 14, 2004 02:54 PM
at that ET, the 138s are more reasonable...I have seen screwy time slips at times, guess the puter was messing up...
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Jason Miller StreetBike Seminars
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BA
Pro
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posted April 14, 2004 05:56 PM
Edited By: BA on 14 Apr 2004 18:56
EXACTLY what I was going to suggest. In fact, it's not unusual at all to have a board read 10mph high.
I fully believe the 112 - 114 mph bogging or wheelying. Definitely.
It does take incredible power to pull down 34-36 mph on the big end.
I know it's really light and all, but at your weight, I'd expect a 138 - 140 big end mph. That would be very realistic.
On a hard launch, where you get closer to 116 - 121 1/8th mph, THEN getting a 148 on the big end is inline with the power to weight ratio.
power to weight tells the story on the back half.
EVEN SO, I'LL BET YOU HAD A BLAST!!
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engineermike
Expert Class
Posts: 101
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posted April 14, 2004 06:03 PM
Not really. A couple reasons why:
My modded Bandit 1200 ran 134 mph. I spent $11k to run 139 mph???
My '95 Supercharged Z-28 runs 133 mph, but feels slow over 100 as compared to the ZX.
Stock engine/height GSXR-1000's pull 142 with 180 lb riders locally.
Stock engine/height 'Busa's pull 144 with 180 lb riders.
Piped/PCR/lowered GSXR-1000's pull 148 mph with 180 lb riders.
I was hoping for better than 139.
Mike
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'04 Orange 10R
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your car is slow
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posted April 14, 2004 06:33 PM
Well im happy for you man...but given your 8th mile times..and your other times...148 is quite erroneous...but if its accurate...good on ya!
...just seems highly unlikely given the rest of the story.
37mph on the back half is quite impressive
the 1000 running 142..probably ran 110 or so in the 8th (32mph)
busa running 144 (probably 110+) 33mph
modded gsxr 148 (still probably runs 110+ in the 8th if not more)..and its modded.
again..its not the number itself...its the mph you accellerated in the last 660' thats incredible to believe.
I believe a 10R with a good rider would run 148 mph stock....it would just be going 115 or so in the 8th.
its also very odd that your final trap speeds are all very similar...cept those two runs. Not to mention they were your best ET runs...so that throws out your "bog/wheelie/etc" excuse for the mph change.
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TurboBlew
Moderator
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posted April 14, 2004 08:12 PM
Chip Ellis went 148 on a pre production 10 in the 1/4. He also went a 5.80 something in the 1/8th.
Those stock Busas.... must have good riders aboard.
148 is ok for lowered 1000s. Ive seen some with decent riders go 150+.. but I couldnt tell you what was done to it.
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MadMike
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posted April 15, 2004 07:10 AM
I could see you pulling 148. or close to it! your a lightweight at 180. what do you have done to your bike? pipe? PC? re-geared? anything.
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kcadby
Pro
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posted April 15, 2004 08:45 AM
It IS possible to have that big-a back-half if the 1/8 is slow (which it was)...
10.5 is a LONG time to get the MPH up...
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matt sterbator
Pro
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posted April 15, 2004 12:07 PM
If ALL the 1/8th mile trap speeds were the same, and all of the 1/4 ETs were within a 1/10th of each other, sounds like they were all pretty consistant runs... something was definitely wrong with the 1/4 mile traps.
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engineermike
Expert Class
Posts: 101
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posted April 15, 2004 01:56 PM
OK, I spent some time doing some physics calc's today.
I used the ZX-10R thrust curves from:
http://www.rumour.com/bike2/Album/Magazine%20Articles/PB%20Mar%202004/04litretest3.gif
thrust/weight(610lb)= acceleration in G's
1G = 32.17 ft/s^2
I then assumed 112 mph as the starting point.
In 10 mph increments, I calculated time to accelerate using t=dV/a.
Then, I calculated distance traveled during that increment using d=v*t + .5*a*t^2. Then start adding the incremental distances and when you get to 660 ft, you just covered the last half the track.
My first try netted 500 ft. to accelerate from 112 to 150 mph. This couldn't be correct because it should take at least 660 ft. I then realized that I hadn't included wind drag, which can be significant at these speeds.
So. . . the formula for wind drag is F=Cd*.5*SectionArea*v^2*AirDensity. You can subract this directly off the thrust. I assumed a Cd of .4.
Bam! The distance to accelerate from 112 to 150 mph became 667 ft, almost dead-on.
I didn't include the effects of ram-air, but I figured it would break even because I didn't include a delay for the shifts either.
Then again, I reeeeeaaaaaally want to believe I was trapping 148 . . .
I'm going back tomorrow night.
One of the other riders thinks I was letting off the gas before the end of the track since I had 'clean' passes at 142 and 148 in the right lane even though both 139's were in the left.
Mike
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'04 Orange 10R
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matt sterbator
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posted April 15, 2004 05:13 PM
139-142mph seems more inline with what real word people are actually running.
Chances of running the same MPH as a jockey on an extended, tire'd, tuned bike seem a little out there.
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CrotchRocket
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posted April 15, 2004 05:44 PM
Mike if your getting 148MPH at the top end with the 1/8 mile 111/112mph, then you have to be spraying the motor!!!
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BA
Pro
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posted April 15, 2004 08:46 PM
hehehe
interesting thread.
Can't wait to see your next set of times Mike. Should be very interesting!
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krexken
Zone Head
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posted April 15, 2004 10:59 PM
I'm guessing they call you mechanical engineer mike? LOL
What kinds of tailwinds, if any, were around that night? When I go to a track near the coast, it's not unusual for my bike to pick up 3-4mph because of slight tailwinds. The good air alone is usually worth a couple mph. One pass was 6mph better that the others. I just got lucky and caught a really, really good tailwind cause my 1/8 time and speed rocked and so did my et.
Lots of folks never mention weather conditions when talking about times. It's amazing the difference they can make. I'd have to go back to the track again and again and again.....
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ZXLNT
Needs a job
Kawpuke Extraordinare
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posted April 16, 2004 08:16 AM
I would gess if its running 148 mph out the back the 1/8 mile is gonna be around 118/119. I just dont see it picking close to 40 mph on the back half with only a 112mph 1/8 mile...
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zx12haitian
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posted April 19, 2004 07:49 PM
Edited By: zx12haitian on 19 Apr 2004 20:51
I saw Ryan run a 9.23 in Atl. He wouldnt say what all he has done to it but you know hoow he does it. I bet its not stock
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zrxdean
Needs a job
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posted April 19, 2004 08:43 PM
I agree with Ken - especially about the wind part. Last Wednesday at Gainesville I went 147 all motor - and the best I've done lately is 143. 141-2 is typical. My 1/8mph was 116. 9.62 et. If I can back up mph on 2 nites, I start to think it's real.
zx12haitian - I'd be careful making bets about Ryan's legality - someone may call you on that and take your money... 
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted April 20, 2004 03:20 AM
It's not stock, but it conforms to the rules. Supersport does not mean PRODUCTION STOCK it never has. It has a pipe, mapping, MR9 fuel, timing adjustments, lowered, strapped, geared to use all 6 gears in the 1/4 mi and many other tweaks. Be careful about implications, the bike is legal.
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engineermike
Expert Class
Posts: 101
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posted April 20, 2004 03:36 AM
Well, I'm not too big to admit when I'm wrong.
This past Friday, the most it would run was 139.5 mph.
I just reeeeaaaaally wanted to believe 148.
I'm just a little disappointed in this bike since my "old tech" Bandit ran 134 mph.
All of the fast GSXR's at the track swear that lowering the bike will bring up my 1/8 mile speeds, which will in turn raise the 1/4 mile speeds.
I have some lowering links and a 1-down front sprocket on order.
Anybody figure out a good way to strap the front down on these yet?
Mike
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'04 Orange 10R
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
Posts: 4089
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posted April 20, 2004 06:11 AM
Is there no way to use a schnitz strap bolted to the brake calipers? (dunno..ive never seen one up close yet)
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