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DRR Pro |
Hey guys just wondering a direction here. Car is pretty consistent just wondering the best coarse of action to get rid of this spin/hop. Car is 6.30 door car hooking good of the get then Looses grip .25 after launch. Shock are compression is pretty loose 2 or 3 from full loose. Extension is about mid way. ![]() -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | ||
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DRR Pro |
Maybe include some car specifics. Cu in / HP Weight with driver Rear diff gear Rear tire size / brand Adjustable front shocks? Obviously a Glide. What planetary gear? 4-link or Ladder bar? Wheels up launch? I like the stall rpm. | |||
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DRR Pro |
468 bbc, launch is 3800, 4 link, tires are mt 32x14s, 4.88 gear. 2750 with driver. Front struts are old as dirt not adjustable. Doesn't pick front end on launch. Rear adjustable shocks. 1.80 pg. -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR Pro![]() |
what is the light blue line honesty is the best policy,insanity is a better deffense 1.036, 6.16@ 224 | |||
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DRR Pro![]() |
does it have a wheelie bar honesty is the best policy,insanity is a better deffense 1.036, 6.16@ 224 | |||
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DRR Top Comp![]() |
I would highly recommend getting a good slow motion video of the car launching. What you are looking for is how much the tire is flattening and if it is bouncing up. Also how much the body is separating at the hit. I have an idea what it needs but with out a good video it is just a guess. One possibility is too low of air pressure and rear shocks not right allowing tire to wrap up, flatten and then unwrap bouncing up (spin). May be as simple as more air or may require tire change. May be able to control it by changing four link settings. There is an issue and it is spinning now you need to find out why. Video. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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DRR Pro |
How much air in rear tires? | |||
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DRR Pro |
Light blue line is 02. Tires are are 7 5psi and brand new. To me it looks like a shock change just not sure which way to go. -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR Pro |
Rear tires need more air imho. Consider starting at 10 psi and work up in 1/2 increments to no more than 12 psi. You should / might be able to feel the tire running over itself in the launch now. | |||
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DRR Pro |
I have video. It will just take a bit to download. Hmm didnt think 7.5 was that far off. I could try it . -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR Pro |
Are these MT 3074 or 3074S ? The 3074S are stiffwall. | |||
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DRR Sportsman |
We've run the 3074 and 3074s both a 9lbs. 2850lbs Cutlass going 9.60s Denis LeBlanc | |||
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DRR Pro |
30751 mt -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR S/Pro![]() |
I think you may have answered your own question..... | |||
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DRR Pro |
Its on the list to be changed but there are plenty of good cars that leave wheels down. I will mess with air pressure and see where that gets me. -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR Pro |
At 103 circumference try 10 psi, make one run and look at your DA. This should show if tire pressure is possibly part of the problem. Here’s a 2840# car with 32x14 stiffwall (Hoosier 103” RO) at 10.5 psi. Leaves wheels down (street struts) and runs 6.0 /6.2/ 6.4 depending on gear leaving in and ignition tune up. This run was 6.25 6.25 Run | |||
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DRR Sportsman![]() |
This^^ My car did the same thing, I loosened the front struts and it fixed it. Front suspension is often overlooked.... Mark Yeager | |||
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DRR Pro |
OK still trying to get the run from last weekend but this was a pass last year at the end of the year. Only thing different now is the slicks are brand new. https://www.youtube.com/watch?v=ys5X88s5__Y The car has struts on it not but I think they are some street setup non adjustable. I am working with Strange to try and identify them. -------------------- Bob Payton S/P, T/D, S/C, TOP 309Z, 393, 3093, 8X93 ![]() www.apdracing.com www.diamondracecars.com www.callies.com | |||
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DRR Trophy![]() |
To me it looks like it hits really hard and can't keep it planted.. If what I was told a few years ago that the Extension is the "hit" and compression keeps it planted, you should try loosening the extension and then tightening the compression. I don't think it would be tire pressure, they look like they have the right amount of wrinkle. Nick Craig 1971 Camaro Split Bumper 376ci LS3 | |||
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DRR Pro![]() |
I vote for new struts. Looks way to tight. doesn't stay tranfered. "Just Shut Up and Race" Brian Martin Martin Racing 5.66 @121.55 | |||
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