squirrly rear suspension at high speed - Team Camaro Tech
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post #1 of 9 (permalink) Old May 2nd, 10, 06:31 AM Thread Starter
Eric
 
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squirrly rear suspension at high speed

I have 68 Camaro, with all calvert racing setup, bolt-in subframe connectors, et street tires with 11 psi, 90/10 shocks in front, moroso trick springs in front, rear afco double adj in rear with rull stiff rebound and full soft bump (since this setting seems to hook good on street), bbc with 700 rear wheel hp, 488 gears, 4500 stall. Car seems to hook pretty good from a 30 mph punch on the street but seems to get squirrly at about 100 mph. I can feel rear end get wobbly. Can't figure out why it does that. Does anyone have any idea why?
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post #2 of 9 (permalink) Old May 2nd, 10, 07:02 AM
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Re: squirrly rear suspension at high speed

Is the rear end a 12-bolt or 9".... My guess and this had happened to me with a 9" and it was new set up from Currie Enterprise/Strange, it had to much back lash/end play. I was able to put it in park and roll the car forward and back wards a good few inches. I called Currie sent it back and they tightened up the clearance for less back lash. Also a new posi pack, if its slipping you will get a pull from one side to another.

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post #3 of 9 (permalink) Old May 2nd, 10, 12:43 PM Thread Starter
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Re: squirrly rear suspension at high speed

It's a stock 8.5 10 bolt with a mini spool. What does rear end ring and pinion play have to do with side to side play. It feels like the tire wobble too much fron left to right. Could the rear shock bump be too low? Would stiffening the bump increase traction on the top end?
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post #4 of 9 (permalink) Old May 2nd, 10, 12:54 PM
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Re: squirrly rear suspension at high speed

You need air in your tires, They will float and wobble at low pressures, Tire and rim size
could be nice to know.
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post #5 of 9 (permalink) Old May 2nd, 10, 12:59 PM
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Re: squirrly rear suspension at high speed

Quote:
Originally Posted by eric68camaro View Post
It's a stock 8.5 10 bolt with a mini spool. What does rear end ring and pinion play have to do with side to side play. It feels like the tire wobble too much fron left to right. Could the rear shock bump be too low? Would stiffening the bump increase traction on the top end?
Well Eric it had allot to do with my 9".. But in your case air pressure like John had mentioned.

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post #6 of 9 (permalink) Old May 2nd, 10, 02:22 PM Thread Starter
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Re: squirrly rear suspension at high speed

Yeah. Thanks. That sounds logical. I have 28X10-15 et streets on 15X8 welds. What tire pressure is recommended for street use. I used to run 11-12 psi on 30X12 slicks on my old nova, but that was a track use car only. I want to drive this camaro on street.
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post #7 of 9 (permalink) Old May 2nd, 10, 03:37 PM
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Re: squirrly rear suspension at high speed

Quote:
Originally Posted by eric68camaro View Post
Yeah. Thanks. That sounds logical. I have 28X10-15 et streets on 15X8 welds. What tire pressure is recommended for street use. I used to run 11-12 psi on 30X12 slicks on my old nova, but that was a track use car only. I want to drive this camaro on street.
Is there a maximum recommended pressure listed on the side wall of those ET Streets????????........why not start there and see how the car/tires feel at speed. Just a thought....


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post #8 of 9 (permalink) Old May 2nd, 10, 07:17 PM Thread Starter
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Re: squirrly rear suspension at high speed

M/T ET streets recommends 12 psi and up for the tire I have and weight of car. So I will try at least 12 psi and work from there. Thanks for the input guys............
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post #9 of 9 (permalink) Old May 3rd, 10, 03:12 AM
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Re: squirrly rear suspension at high speed

With a large tire, 28X10, its going to 'balloon' at the speed.

This means, if you were looking at a cutaway of the tire/wheel, you would see two rectangles on top & bottom of the wheel depicting the tire. Add speed to the picture and the rectangle becomes a circle, the circumference grows in the middle and the tire becomes narrower, sidewalls are more flexible at this speed than at rest or 30 MPH.

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