Re: Launch dilema
[Re: 7sec.cuda]
#1097623
10/19/11 08:39 PM
10/19/11 08:39 PM
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Joined: Dec 2005
Posts: 872 NJ
SSDAcuda
super stock
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super stock
Joined: Dec 2005
Posts: 872
NJ
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It could work good in the heat but may be borderline and when track temps go down…
Time to change the setup. You have alot of horsepower and I'm sure once it hooks it works the suspension, but the suspension just doesn't seem to be working in the cold.
If the front is full loose, nothing to do there. You can try hitting the tire softer by moving the IC out and down a hair.
I agree with B1 also and would take a couple,4,8 degrees out in first gear to get it down through there.
Also take a .5lb out of the rear tire and see if it helps.
Your video is excellent and definitely helps. I have to get a camera man next year. Its nice to see what its doing besides relying on the racepak or the seat of the pants...
SS/DA 1924
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Re: Launch dilema
[Re: gearjammerdart]
#1097624
10/19/11 08:45 PM
10/19/11 08:45 PM
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Joined: Dec 2009
Posts: 21,066 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,066
in a cattle trailer down by th...
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Have you checked the wear on the rear tires to see if it's even across the tread width? I would have to say that it does look stiff for some reason. What gets me thinking is that it works when it's hot but not when it's cold. That could be a tire issue. Have you only used the M/T's or have you tried a softer compound in a different brand? Your car is pretty fast and most tracks I've run on would have a hard time holding that consistently.
Have you played with the pressure at all? Your videos don't show the burnout, maybe when it's cooler you need to do longer or shorter burnout. Lot's of stuff to try.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Launch dilema
[Re: 7sec.cuda]
#1097626
10/19/11 09:40 PM
10/19/11 09:40 PM
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Joined: Jan 2003
Posts: 10,091 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,091
Frostbitefalls MN (Rocky&Bullw...
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I am not familiar with cars that run better than 1.2+ 60 fts, but will offer what I see. Looks to me like you nailed the setup for a fast surface/best scenario but this day was much different. By that I mean the rear suspension is not hitting the tires, you use torque and available traction to get needed weight transfer. The surface won't handle the hit without a softer rear shock and shorter IC , or maybe one or the other. Same with the front. It didn't even try and rise. You might have to start with a setup that will handle this type of track and see just how much that setup will cost you on a good traction day. You may be able to leave it close to the same settings, maybe not. But it should have at least let the wheeliebars touch the track on the hit, IMHO. What was the track temp?
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Launch dilema
[Re: gregsdart]
#1097628
10/19/11 09:59 PM
10/19/11 09:59 PM
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Joined: Dec 2009
Posts: 21,066 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,066
in a cattle trailer down by th...
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Quote:
I am not familiar with cars that run better than 1.2+ 60 fts, but will offer what I see. Looks to me like you nailed the setup for a fast surface/best scenario but this day was much different. By that I mean the rear suspension is not hitting the tires, you use torque and available traction to get needed weight transfer. The surface won't handle the hit without a softer rear shock and shorter IC , or maybe one or the other. Same with the front. It didn't even try and rise. You might have to start with a setup that will handle this type of track and see just how much that setup will cost you on a good traction day. You may be able to leave it close to the same settings, maybe not. But it should have at least let the wheeliebars touch the track on the hit, IMHO. What was the track temp?
I think that is a very good observation Greg.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Launch dilema
[Re: Guitar Jones]
#1097629
10/20/11 01:49 AM
10/20/11 01:49 AM
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Joined: Jan 2003
Posts: 19,544 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,544
Las Vegas
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Well from what I see in the video the rear suspension is doing nothing at all. I agree with some of what has been posted already. You are going to need to loosen the rear shocks on both extension and compression and IMO a four link adjustment woulg be on my to do list. Any idea what the IC and hieght is now? My junker was doing similar things on cold tracks-vs-hot tracks although not to that extent. I was having a problem "holding" on to the track on cold days. We found a 4 link setting that works well in both, with a much shorter IC than before. now we just make adjustments to the shocks for varying track conditions/temps. I am not as quick as you but 60' but in the 1.teens on a good day at sea level and can go 8'ohs. Would love to pick your brain a little on the 99 hemi thing. Oh yeah BTW I think your problem is to much wheelspeed
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Re: Launch dilema
[Re: Al_Alguire]
#1097630
10/20/11 01:58 AM
10/20/11 01:58 AM
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Joined: Jan 2003
Posts: 19,544 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,544
Las Vegas
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Well actually after watching it a few more times in the second video it appears like it is trying to hit the tire but loosing it quickly. Did you make any changes between that first video and the second one? If so what were they? In the first video it really appears as if nothing is happeneing n the rear.
It also appears to be hitting the tire at the 6 o'clock position, not farther forward. But as i said it definitely did not stay there. Perhaps loosening the compression a few clicks may have helped keep it planted better.
Have you loosened up the compression to help keep it planted? There is a slight downward movement to the wheelie bar and a little wrinkle of the tire before it goes up. I still would look at moving the IC closer but woudl be curious to hear exactly whats up with the rear shock settings. What shocks are they and what springs? Could be WAY to heavy a spring but I doubt that is the issue.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Launch dilema
[Re: Al_Alguire]
#1097631
10/20/11 07:46 AM
10/20/11 07:46 AM
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Joined: Dec 2005
Posts: 872 NJ
SSDAcuda
super stock
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super stock
Joined: Dec 2005
Posts: 872
NJ
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Al, from my experiences, shortening the ic seemed to hit the tire harder. Maybe, I'm wrong, but out and down was definitely softer on the tire.
I do think your assesments are dead on...
SS/DA 1924
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Re: Launch dilema
[Re: SSDAcuda]
#1097632
10/20/11 09:22 AM
10/20/11 09:22 AM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
master
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master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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temps like that can have a huge effect on shocks..its making the settings on the rears act much stiffer. plus the motor is making more steam with cooler denser air. im with greg move the bars to hit the tires harder . sans making physical adjustments.. short term/or in a pinch..you could try to run the car up and down the retrun road or over some bumps and put/get some temperature in the shocks before you stage..see if that does anything.
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 [image][/image]
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Re: Launch dilema
[Re: Al_Alguire]
#1097633
10/20/11 09:58 AM
10/20/11 09:58 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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For some reason he hasnt said the 4 link IC... but from what I have seen a longer IC will tend to lift the front more and the lower IC will sustain the hit longer, also pushes harder forward.... and shorter IC lifts the rear of the car... higher IC hits the tire harder and for a shorter period of time...about the optimum point is right around the CG or slightly behind it then its a matter of how high...I only get a 1.19 60' so his car is out of my comfort area..... JMO
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Re: Launch dilema
[Re: 7sec.cuda]
#1097635
10/20/11 10:50 AM
10/20/11 10:50 AM
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Joined: Jan 2003
Posts: 19,544 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,544
Las Vegas
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Well it is kinda all speculation at this point since we dont know where it is now. Or the weight bias of the car. At any rate something needs to change or is broken, binding or just not working. I think we could all use a bit more info for sure.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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