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Critirque this launch! (video) #814543
09/26/10 12:19 AM
09/26/10 12:19 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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http://www.youtube.com/watch?v=_TwbAoIMTSk
Looks to me like it is crushing the tire and bouncing still. More air and more shock? OR?
Car did go all time best 60 ft 1.260 with 1151 DA.


8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
Re: Critirque this launch! (video) [Re: gregsdart] #814544
09/26/10 12:25 AM
09/26/10 12:25 AM
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S.E. South Dakota !
bigdad Offline
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Needs more cowbell

Looks great to me ?


The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
Re: Critirque this launch! (video) [Re: bigdad] #814545
09/26/10 12:33 AM
09/26/10 12:33 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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It looks to me that it is bouncing off the tire a couple of times at the hit. Doesn't look to be spinning, but I want to try and smooth out that suspension travel so if the track gets marginal it will still leave as hard.


8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
Re: Critirque this launch! (video) [Re: gregsdart] #814546
09/26/10 12:47 AM
09/26/10 12:47 AM
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Las Vegas
Al_Alguire Offline
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Defintely hittin the tire pretty hard. What shocks and where are they at Ext and Compression wise? What air pressure? What is the wheelie bar hieght? Forgive my old age but this is a ladder bar car right?

Looking good. 60's much better than mine does relatively speaking for the ET's that is. What is the gear and rear tire? What launch RPM do you leave at?


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Critirque this launch! (video) [Re: gregsdart] #814547
09/26/10 12:51 AM
09/26/10 12:51 AM
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Out West
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408strokerdart Offline
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Can front end be tightened up a touch? Seems to be getting up on the wheelie bars and bouncing back down enough to make the front end bounce. I think you are making enough power to carry the front end and set it down softly. There is still some et left to gain in 60' for you. Car looks and sounds great.

Re: Critirque this launch! (video) [Re: 408strokerdart] #814548
09/26/10 01:02 AM
09/26/10 01:02 AM
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Branson, Mo.
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joedust451 Offline
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It doesn't look that bad off, but from what i see (& i'm no expert) is you might need to tighten up the "re-bound" on the shocks, it looks like its planting them & popping back up as the front is riseing helping to keep it somewhat stable back there, I would try a slightly tighter re-bound, then maybe you can run a bit more air pressure so the tires don't wodd up


75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU
Re: Critirque this launch! (video) [Re: Al_Alguire] #814549
09/26/10 09:02 AM
09/26/10 09:02 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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I have Afco double adjustable s, full stiff on compression, about four of eight on extension. Ladderbars, wheeliebar set high at about ten inches . I leave at part throttle 4300 rpm against a 6400 rpm stall, use an air cylinder type throttle controller for a soft hit. Tires are 15.1 x 33.6 x 15 Goodyear 2079 on 14 inch rims at 9 and 1/3 psi. Torqueflite 2.45 low and 4.56 gears.
I agree the front is too loose.
For this morning I am going to go from full soft on the front shocks to one sweep on the extension setting. The rears will get tightened another 1/2 to full sweep on the adjuster. Tire pressure will go up to 9.5 from 9.33. Lots of changes, but I believe they all make sense, unless someone sees a conflict in the chosen adjustments.

Last edited by gregsdart; 09/26/10 09:16 AM.
Re: Critirque this launch! (video) [Re: gregsdart] #814550
09/26/10 09:18 AM
09/26/10 09:18 AM
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Quicktree Offline
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looks like the wheelie bars are to high to me

Re: Critirque this launch! (video) [Re: gregsdart] #814551
09/26/10 09:45 AM
09/26/10 09:45 AM
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The Swamp
MegaDart Offline
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Quote:

I have Afco double adjustable s, full stiff on compression




I would start right there...

Re: Critirque this launch! (video) [Re: MegaDart] #814552
09/26/10 11:54 AM
09/26/10 11:54 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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Quote:

Quote:

I have Afco double adjustable s, full stiff on compression




I would start right there...



Try softer i take it?


8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
Re: Critirque this launch! (video) [Re: gregsdart] #814553
09/26/10 12:02 PM
09/26/10 12:02 PM
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Quote:

Quote:

Quote:

I have Afco double adjustable s, full stiff on compression




I would start right there...



Try softer i take it?


if it's full stiff and pounding the tires will going softer help? I doubt it. slow the front end down and lower the wheelie bars is where I would start

Re: Critirque this launch! (video) [Re: gregsdart] #814554
09/26/10 12:11 PM
09/26/10 12:11 PM
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detroit, mi
POS Dakota Offline
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All time best 60 foot of 1.26?
I say leave it. It's not broken, dont fix it.

Car is beautiful BTW.
I wish I had your problems!

Re: Critirque this launch! (video) [Re: POS Dakota] #814555
09/26/10 12:19 PM
09/26/10 12:19 PM
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Las Vegas
Al_Alguire Offline
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IMO you need to tighten up the extension, I would start at maybe two from full stiff and soften up the compression to the middle. In other words about completely opposite from where it is now. Looks to me like you are hitting the tire hard and stiffening the extension on a ladder bar car would be the direction to go. The wheelie bars look OK once you get the hit under control. Plenty of power to ride the bars for a bit and set it down nicely. Would imagine with all that stifness on compression it cant be happy on anything less than a smooth track down track. Well those are my thoughts but your mileage may vary...


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Critirque this launch! (video) [Re: Al_Alguire] #814556
09/26/10 01:40 PM
09/26/10 01:40 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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Al, did what you suggested, but only to about 3/4 from full stiff compression on the back, one sweep stiffer of eight total on extension. Small adjustments,I want to get through the first round!


8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
Re: Critirque this launch! (video) [Re: Quicktree] #814557
09/26/10 02:18 PM
09/26/10 02:18 PM
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The Swamp
MegaDart Offline
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Quote:

Quote:

Quote:

Quote:

I have Afco double adjustable s, full stiff on compression




I would start right there...



Try softer i take it?


if it's full stiff and pounding the tires will going softer help? I doubt it. slow the front end down and lower the wheelie bars is where I would start




and perhaps you could help adjust his pinion angle too!!

Greg, I would not want to show up at a track knowing I had NO usable adjustment left on the shocks. Unless tuning a 3 link is opposite a 4 link softening the compression should take away some of the hit. IMO, when you get to low 9's, high 8's etc. is a good time for a 4link, ladder bars are just to violent at that power level.

Re: Critirque this launch! (video) [Re: gregsdart] #814558
09/26/10 03:00 PM
09/26/10 03:00 PM
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off the grid
340B5 Offline
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Quote:

Al, did what you suggested, but only to about 3/4 from full stiff compression on the back, one sweep stiffer of eight total on extension. Small adjustments,I want to get through the first round!




There ya go, a tick at a time.

If it isn't very broke...don't fix it very much.


Yeah, it's got a smallblock.
Re: Critirque this launch! (video) [Re: 340B5] #814559
09/26/10 03:24 PM
09/26/10 03:24 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline OP
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The final installment!
The gains keep coming. 1.259 60 ft, felt smoother.
I dialed an 8.93 due to a good cross wind, thinking it should run a .90 with no wind, figuring a .93 should do. The wind died suddenly ! I swear it did so in the middle of the run? The flags were dead still as I returned to the pits. I ran out by .025 on the brakes with an 8.905 at 145.78. The 1,000 ft was .003 quiker than the 8.891 pass yesterday. Oh well,,,,,,
All in all a fun weekend. New best of 1.259 60 ft, with room for improvement. Thanks all who contributed whether I used your suggestions or not. They all give a guy something to think about!

I am still looking for input. The last pass video didn't turn out. So, any more thoughts? I plan on softening the compression at the back and continually tightening the front till the improvements stop. Then I will start lowering the wheeliebars till it slows. Same with Tire pressure. The harder I can run them and hook, the faster it should be.
I agree it should have a fourlink, but budget says run what ya got for now.

Last edited by gregsdart; 09/26/10 03:30 PM.

8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
Re: Critirque this launch! (video) [Re: gregsdart] #814560
09/26/10 03:58 PM
09/26/10 03:58 PM
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The Swamp
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Nice job!
Very hard to give quality advice without a handful of timeslips and data to evaluate. I was simply pointing out a glaring issue. At least to me it would be!!
Sounds like your heading in the right direction!
hmmmm, 8.90 @ 145, could be BIG trouble in SC!

Re: Critirque this launch! (video) [Re: gregsdart] #814561
09/26/10 04:35 PM
09/26/10 04:35 PM
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acworth / N. georgia - south e...
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i am with quick tree..
lower the wheelie bars...not a whole lot...but ill explain my hypothosis..
the shock extremes to me... dont leave alot of future adjustment..
its just too stiff.

i would tend to allow the suspension a tad more movement..and control a portion of it with the shocks..
right now its too stiff...puts a load somewhere else into the equation...which is the tire..
it takes the hit..then the wheelie bar touches and it unloads the tire...
lowering the wheelie bars..(and possibly backing off the wheelie bars spring just to tune absorb the hit..
this will allow it to continue weight transfer and still remove the bounce..
you hit the wheelie bars and it interupts the rise...this is abrubt reaction unloads the tire...
if you catch the rise with the wheelie bar...
alow it to control the rise without interupting it abrubtly.....so it doesnt stop the movement just cushion..
it will keep the rear loaded...
the wheelie bar now is forcing a different reaction..causing the bounce.
if the wheelie bar is set lower it will contact the ground earlier in the chain of events..and you can keep it in contact..with the ground..
let the car rise a little after the wheelie bars touch...
it wont interupt the upward movement so abruptly..
full stiffness of the shocks it putting the hit all on the tire..
the car comes up..the wheelie bars hit..it abrubtly changes the upward motion...this unloads a little at the tire..the tire rebounds..then the wheelie bars touch down again..
Imho..keep the wheelie bars planted...with out a rebound action...
the car will leave better...
shock adjustments may still need to be moved..
tightening up the front will take alittle bit out of the total rise...it looks pretty tight in the vid..though....?
but the wheelie bar bounce is a symptom..
not claiming to be an expert..just trying to explain my reasoning..
cheapst.


365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
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Re: Critirque this launch! (video) [Re: MegaDart] #814562
09/26/10 07:57 PM
09/26/10 07:57 PM
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Quote:

Quote:

Quote:

Quote:

Quote:

I have Afco double adjustable s, full stiff on compression




I would start right there...



Try softer i take it?


if it's full stiff and pounding the tires will going softer help? I doubt it. slow the front end down and lower the wheelie bars is where I would start




and perhaps you could help adjust his pinion angle too!!

Greg, I would not want to show up at a track knowing I had NO usable adjustment left on the shocks. Unless tuning a 3 link is opposite a 4 link softening the compression should take away some of the hit. IMO, when you get to low 9's, high 8's etc. is a good time for a 4link, ladder bars are just to violent at that power level.


ok nowmaybe Monte will come in and tell us what a pro would do. I know you are watching

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