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Re: Big Wheelie, tripped the 60's with rear tires... [Re: cudabin] #1035716
07/20/11 12:11 AM
07/20/11 12:11 AM
Joined: Sep 2006
Posts: 1,305
Hobart,Indiana
MoparPitBull Offline
Hollywood
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Hollywood

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Hobart,Indiana
VERY NICE!

Re: Big Wheelie, tripped the 60's with rear tires... [Re: 440Jim] #1035717
07/20/11 12:17 AM
07/20/11 12:17 AM
Joined: Jan 2003
Posts: 10,021
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Frostbitefalls MN (Rocky&Bullw...
Quote:

Equation of a circle:
R^2 = x^2 + y^2
Dia R_ y y2 x2_ x
32 16 5 25 231 15.199 Rear tire trip point
26 13 5 25 144 12.000 Front tire trip point
3.199 Trip point difference
So on my car the beam trip points are 3.199" different than the wheel base. ie 111-3.2=107.8

And for Cudabin, I think he has 31 and 26 tires:

Dia R__ y y2 _x2___ x
31 15.5 5 25 215.25 14.671
26 13.0 5 25 144.00 12.000
2.671
And with a 108" wheel base, that changes the trip points to 108-2.67=105.3" (pretty close to my original estimate in post above).



Well, thats gettin with it, math wise. pretty much spot on I bet. Arnies other 60 fts reflect what you stated hear.

"
Yes it is heavy on the front with about 57% of the wieght there. The 4 gallon fule cell is front mounted which does not help.."
And I thought I was heavy up front at 52.5 %,,,,,,,,,,,

Last edited by gregsdart; 07/20/11 12:19 AM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Big Wheelie, tripped the 60's with rear tires... [Re: gregsdart] #1035718
07/20/11 12:22 AM
07/20/11 12:22 AM
Joined: Jan 2003
Posts: 26,015
United Socialist States of Ame...
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tboomer Online work
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United Socialist States of Ame...
Wow!!


Need your rear end checked out? Contact Grizzly!!
Re: Big Wheelie, tripped the 60's with rear tires... [Re: 440Jim] #1035719
07/20/11 12:43 AM
07/20/11 12:43 AM
Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
cudabin Offline OP
super stock
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Saskatchewan, Canada
Quote:

Equation of a circle:
R^2 = x^2 + y^2
Dia R_ y y2 x2_ x
32 16 5 25 231 15.199 Rear tire trip point
26 13 5 25 144 12.000 Front tire trip point
3.199 Trip point difference
So on my car the beam trip points are 3.199" different than the wheel base. ie 111-3.2=107.8

And for Cudabin, I think he has 31 and 26 tires:

Dia R__ y y2 _x2___ x
31 15.5 5 25 215.25 14.671
26 13.0 5 25 144.00 12.000
2.671
And with a 108" wheel base, that changes the trip points to 108-2.67=105.3" (pretty close to my original estimate in post above).




Wow Jim! You never cease to amaze me... thanks for all the great tech.

Greg, I agree with you as my best ever 60 foot was a 1.25 and i have pulled a couple 1.27's so far.

I need to build some taller limiters for the upper control arms so that I can leave the front end loose, yet limit the wheelie.

It is fun to see nothing but sky for the first second or so, but it won't win any races if i cant repeat.

Cheers,

Arnie


67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...) 70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
Re: Big Wheelie, tripped the 60's with rear tires... [Re: tboomer] #1035720
07/20/11 12:50 AM
07/20/11 12:50 AM
Joined: Jun 2010
Posts: 469
Tennessee
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steeldust Offline
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Tennessee
What RPM are you leaving at and what`s the weight of the car it looks killer and it has good ets man that DUSTER at that track looks killer two all of the guys cars here looks cool my car the harder i leave it don`t come up as high but it gos out but i did put wheelie bars on

Re: Big Wheelie, tripped the 60's with rear tires... [Re: Chris'sBarracuda] #1035721
07/20/11 01:12 AM
07/20/11 01:12 AM
Joined: Jan 2003
Posts: 19,385
Las Vegas
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Las Vegas
Quote:

Unless it was in that position thru 60'... The clocks most likely caught a part of the car further forward.. The sensors aren't ground level..

Somewhere in the neighborhood of 8" off ground..

You really can't figure it out..

That's why you go with the 330' mark..


Chris..




With what he said. Kinda what i was getting at. The thing is you dont know what tripped the beams. Likely something other than the rear tire did.

Re: Big Wheelie, tripped the 60's with rear tires... [Re: Al_Alguire] #1035722
07/20/11 07:28 AM
07/20/11 07:28 AM
Joined: Feb 2005
Posts: 846
Long Island, NY
Cudafied Offline
super stock
Cudafied  Offline
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Long Island, NY
Nice Wheelstand

Just food for thought - I welded this on my K-frame before I went out with the new (replacement) oil pan





P.S. the oil filter in the picture was just for breaking in new engine

Re: Big Wheelie, tripped the 60's with rear tires... [Re: Al_Alguire] #1035723
07/20/11 11:01 AM
07/20/11 11:01 AM
Joined: Jan 2003
Posts: 16,932
NC
440Jim Offline
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Quote:

Quote:

Unless it was in that position thru 60'... The clocks most likely caught a part of the car further forward.. The sensors aren't ground level..

Somewhere in the neighborhood of 8" off ground..

You really can't figure it out..

That's why you go with the 330' mark..


Chris..




With what he said. Kinda what i was getting at. The thing is you dont know what tripped the beams. Likely something other than the rear tire did.


Yes, lots of other factors including upseting the chassis, wind drag on the bottom (high wheel stand), etc, etc. Not all wheel stands and cars are the same. That is just the math, not the total picture. It is only as good as the assumptions...

Re: Big Wheelie, tripped the 60's with rear tires... [Re: dOc …] #1035724
07/20/11 11:33 AM
07/20/11 11:33 AM
Joined: Jan 2003
Posts: 2,771
Cedar Lake IN
CRT Offline
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Cedar Lake IN
Quote:

Quote:

I don't care about lost time and wasted energy. That is JUST cool!!! Let the Pro Stock guys worry about that stuff! Is that in Saskatoon? Did they put in a cement launch pad?




NEVER had a car that would do that ... but I would be more worried about what happens when the car comes-to-earth ...

I have seen 'nuff of these wheelies in the past and have seen PLENTY of damage to frontends, suspensions, headers, oil pans and even engines.

DOES look neat though ....

TO the OP ... with that heavy VFN frontend on it .. I would have thought it would have stayed-low !

YOU sure have some decent power THEN ...to do what you did ...




Doc, when was the last time you have been down the track in a race car ?

Re: Big Wheelie, tripped the 60's with rear tires... [Re: 440Jim] #1035725
07/20/11 11:44 AM
07/20/11 11:44 AM
Joined: Jan 2003
Posts: 3,104
Wheels up, MO
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nhramark Offline
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Wheels up, MO
The 60' difference on my car is right at 1/10. In my case the car was accelerating very hard, was not as high in the air, and did not touch down till about 130' so I'm pretty sure it was the rear tire that tripped the 60' beam.

That skid plate looks like a good idea for protecting the oil pan but what kind of ground clearance do you have now? Looks like trailer loading/unloading could be complicated.


[image]http://s1126.photobucket.com/user/nhramark1/library/Racing[/image] 9.100 @ 150 mph 5.780 @ 120 mph
Re: Big Wheelie, tripped the 60's with rear tires... [Re: cudabin] #1035726
07/20/11 11:55 AM
07/20/11 11:55 AM
Joined: Jan 2003
Posts: 10,021
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Frostbitefalls MN (Rocky&Bullw...
"I need to build some taller limiters for the upper control arms so that I can leave the front end loose, yet limit the wheelie."

A pretty sharp racer pointed out to me to keep the limiters from being too harsh when they stop the front travel. Sure seemed to help having a soft stop, rather than the metal on metal ones a lot of guys use. It makes for a smooth transition, rather than something that can unload the rear enough to cause problems.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Big Wheelie, tripped the 60's with rear tires... [Re: Chris'sBarracuda] #1035727
07/20/11 01:45 PM
07/20/11 01:45 PM
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Posts: 116
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ggddemon Offline
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Quote:

Unless it was in that position thru 60'... The clocks most likely caught a part of the car further forward.. The sensors aren't ground level..

Somewhere in the neighborhood of 8" off ground..


Hey Chris.
As far as the sensors go . I look after the track "airport" here in yorkton, when we have our events. We use 115 ft. of concrete launch distance--- more is available----, the sensors are : prestage 2.25"...stage is 2.25" ....60' is 4.25"along with m.p.h. and e/t being 4.25" also . All distances from ground level.
Unfortunately, our yearly event is held at our local municipal airport for a annnual 2 day event, along with the landing strip and taxi area they seam sealed the joints 4-5 weeks ago and were our stage beam lines up the seamseal wound up right on the rear tire mark on most common wheel based door cars This combo along with +34* Celcius temp and sky high humidity gave the odd racer a lower 60' than other years.. But all great for chits and giggles.

Dave

Re: Big Wheelie, tripped the 60's with rear tires... [Re: 440Jim] #1035728
07/20/11 05:24 PM
07/20/11 05:24 PM
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Posts: 3,101
cincinnati ohio
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mcat4321 Offline
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Quote:

Quote:

Doing the math figuring 52 mph at the 60 ft clocks (average) I come up with .1224 lost time.


That is about the same as I come up with if I assume 52 mph and 111" between the front and rear tire trip points.

But I think closer to 55 mph and with a 108" wheel base, and tire diameters of 26/31 (~105.5" between trip points):
55 mi/hr x 5280 ft/mi /3600 sec/hr x 12in/ft = 968 in/sec
For 105.5", that is about 105.5/968=0.109 sec
So the rear tire 1.37 might be about 1.26 with the fronts.

I might not have this 100%, but that is my estimate. The experience with my car is about 0.10 sec difference.
55 mi/hr x 5280 ft/mi /3600 sec/hr x 12 in/ft = 968 in/sec (again)
And my car is 111 -(32/2-26/2)=108.0" between trip points, (not exact need equation of a circle at beam height)
So... 108.0/968 = 0.11 sec and I have seen about 0.10 on the same day.



ouch... my head hurts

Re: Big Wheelie, tripped the 60's with rear tires... [Re: mcat4321] #1035729
07/20/11 05:37 PM
07/20/11 05:37 PM
Joined: Jan 2003
Posts: 10,021
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Quote:

Quote:

Quote:

Doing the math figuring 52 mph at the 60 ft clocks (average) I come up with .1224 lost time.


That is about the same as I come up with if I assume 52 mph and 111" between the front and rear tire trip points.

But I think closer to 55 mph and with a 108" wheel base, and tire diameters of 26/31 (~105.5" between trip points):
55 mi/hr x 5280 ft/mi /3600 sec/hr x 12in/ft = 968 in/sec
For 105.5", that is about 105.5/968=0.109 sec
So the rear tire 1.37 might be about 1.26 with the fronts.

I might not have this 100%, but that is my estimate. The experience with my car is about 0.10 sec difference.
55 mi/hr x 5280 ft/mi /3600 sec/hr x 12 in/ft = 968 in/sec (again)
And my car is 111 -(32/2-26/2)=108.0" between trip points, (not exact need equation of a circle at beam height)
So... 108.0/968 = 0.11 sec and I have seen about 0.10 on the same day.



ouch... my head hurts




Teacher- Robert, what is Pi R squared ?
Robert- A poptart?


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Big Wheelie, tripped the 60's with rear tires... [Re: CRT] #1035730
07/20/11 05:56 PM
07/20/11 05:56 PM
Joined: Jul 2008
Posts: 30,497
Florida STAYcation
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Quote:


Doc, when was the last time you have been down the track in a race car ?




Hay J C .....wassssupy ? ...

I have never HAD a real race car ... don't think I ever will ...uNless Apple computer stock goes up aNother couple of huN !

But a NASTY off-shore boat would come first ....

Re: Big Wheelie, tripped the 60's with rear tires... [Re: ggddemon] #1035731
07/20/11 08:10 PM
07/20/11 08:10 PM
Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
cudabin Offline OP
super stock
cudabin  Offline OP
super stock

Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
Quote:

Quote:

Unless it was in that position thru 60'... The clocks most likely caught a part of the car further forward.. The sensors aren't ground level..

Somewhere in the neighborhood of 8" off ground..


Hey Chris.
As far as the sensors go . I look after the track "airport" here in yorkton, when we have our events. We use 115 ft. of concrete launch distance--- more is available----, the sensors are : prestage 2.25"...stage is 2.25" ....60' is 4.25"along with m.p.h. and e/t being 4.25" also . All distances from ground level.
Unfortunately, our yearly event is held at our local municipal airport for a annnual 2 day event, along with the landing strip and taxi area they seam sealed the joints 4-5 weeks ago and were our stage beam lines up the seamseal wound up right on the rear tire mark on most common wheel based door cars This combo along with +34* Celcius temp and sky high humidity gave the odd racer a lower 60' than other years.. But all great for chits and giggles.

Dave




Hey Dave GGDDemon,

My first pass was this wheelie and yes it did trip with the rear tires as I have a poor quality video showing it...

Next 2 passes when track was hot it slipped a bit. Were others having same problem??

Cheers,

Arnie


67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...) 70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
Re: Big Wheelie, UPDATE w/ pic at 60'... [Re: cudabin] #1035732
07/22/11 12:43 AM
07/22/11 12:43 AM
Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
cudabin Offline OP
super stock
cudabin  Offline OP
super stock

Joined: Jan 2004
Posts: 903
Saskatchewan, Canada


New pic in the original post at 60 feet...


67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...) 70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
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