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Old 06-24-2019, 10:20 PM   #1
coppercutlass
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Default traction issues still relevant

OK so I have made 7 passes with the new engine combo and haven't made one clean pass. First 4 passes where all made with a sever flat spot off the line best 60 ft. was a 1.67

I fixed the carb issues and now I got traction issues. Im sure this time around its my tires. I have nitto drag radials BUT.... I wanna say track prep last weekend was not in my favor.


Current suspension is tubular uppers and lowers in the front with .90 tall upper ball joints and 80/20 afcos with 66 6cyl. A body front springs. IN the rear I have QA1 single adjustable and had them set to 5 clicks from 0 with 442 rear springs , SSM lift bars , adjustable uppers with pinion angle being -3 degrees.



In the first video its a bit more sever as I launched at about 1700 RPM It hit the tires much harder . In the 2nd video I launched at about 2500 RPM and spun but not nearly as bad. IM leaning towards tires and im having my hoosiers mounted this week. Any advice is appreciated.

1st vid



2nd vid


This is a video of my best pass the first outing it was a 12.10 with a 1.67 60 ft. and it had a flat spot off the line and I short shifted the 1-2 shift really bad.


Last edited by coppercutlass; 06-24-2019 at 10:22 PM.
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Old 06-25-2019, 11:59 AM   #2
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Default Re: traction issues still relevant

Slow the front down more if u can, How much travel? If u watch your second video, u ARE losing shock travel travel foot braking it, Possibly in the rear also, Put some shock extensions on if u can
The first video its coming up to fast in front and upsetting the rear
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Last edited by grandville455; 06-25-2019 at 12:02 PM.
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Old 06-25-2019, 12:12 PM   #3
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Travel is about 5.5 inches in the front. I have incremental snubbers i made. How slow shoukd i go in the front. Maybe I should put the front sway bar back on to slow it down ? The front seemed to move just as fast with the 80/20's as with the 90/10 's
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Old 06-25-2019, 12:23 PM   #4
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Default Re: traction issues still relevant

Quote:
Originally Posted by coppercutlass View Post
Travel is about 5.5 inches in the front. I have incremental snubbers i made. How slow shoukd i go in the front. Maybe I should put the front sway bar back on to slow it down ? The front seemed to move just as fast with the 80/20's as with the 90/10 's
Slow enough to not upset the rear, Get some cheap summit 3 ways and set on 60/40 maybe, that second video u lost so much travel on the foot brake by the time u launched u had very little left for transfer, also make sure u have enough in the rear too, U should have as those cars don't separate nearly as much as a leaf spring car
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Old 06-25-2019, 12:47 PM   #5
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In the video where I foot braked it much higher and lost some travel I actually spun alot less . im gonna guess i didnt shock the rear tire as hard when i left at a much lower RPM.
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Old 06-25-2019, 12:53 PM   #6
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That's one reason I'm leaning towards tires but I did notice the front end was coming up way too fast.
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Old 06-25-2019, 02:34 PM   #7
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Default Re: traction issues still relevant

Videos by someone standing near the starting line are hard to analyse. I recommend to everyone trying to figure out their car to stick a go-pro on the rear quarter so you can see the rear tire and fender plus the front end. One video and you can easily see what the chassis is doing. I get frustrated trying to watch the car's suspension from a distance while it is moving.

My only impression with the video I saw is there is little separation on the rear. But a video taken from a camera mounted on the car will provide a much better view.
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Old 06-26-2019, 02:52 PM   #8
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I know it's hard to tell from these videos. My wife's phone has the slowmotion setting on her phone which really helps. Wish it would post to anything besides her phone like that. From the slow motion video. I can see exactly when the tires broke loose and it's the video where i launched at a lower RPM as soon as I hit full extension on the front., the tires blew off and the rear settled back down fast after its extension . Im gonna try a better camera angle and a full slick vs. My nitto drag radials. I know the bias plys can be more forgiving.
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Old 06-26-2019, 08:25 PM   #9
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Default Re: traction issues still relevant

Quote:
Originally Posted by coppercutlass View Post
I know it's hard to tell from these videos. My wife's phone has the slowmotion setting on her phone which really helps. Wish it would post to anything besides her phone like that. From the slow motion video. I can see exactly when the tires broke loose and it's the video where i launched at a lower RPM as soon as I hit full extension on the front., the tires blew off and the rear settled back down fast after its extension . Im gonna try a better camera angle and a full slick vs. My nitto drag radials. I know the bias plys can be more forgiving.

Install Quicktime on your laptop and download the video to the laptop. Bring up the video and play it frame by frame once the bottom bulb is lit or the tire just starts to rotate. I have some slo-mo vid of several cars at launch and it's a shitshow of ugly on how tires, springs, shocks and axle housings are not playing on the same team.
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Old 07-01-2019, 09:43 PM   #10
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Default Re: traction issues still relevant

Question guys . Could I use the sway bar to slow down my front end movement ? Also since my front end is coming up very fast can I preload my control arm bushings in the front to slow it down ?

I didn't think about this but when I set them in there I had a slower set up and all I did was snug the bolts and double nut them on the lowers on the uppers I didn't mess with the cross bar . I know this allows for some fast movement but maybe too much now ?
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Old 07-02-2019, 12:37 AM   #11
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Default Re: traction issues still relevant

Imo you are over thinking it.
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Old 07-16-2019, 06:43 PM   #12
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Default Re: traction issues still relevant

The Nittos can be very temperamental at the track, don't know anyone who likes them. I per went to the M/T and wow what a diff. The Nittos where good in the rain, lol.

At least this is my experience on a 67 camaro. Good look! Let us know how she runs on the new tires.

Keep playing with it.

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