Wheel aligning

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Mar 10, 2021 | 09:08 PM

mullvamp

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Cruising

Joined: Sep 2017

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Wheel aligning

Wondering about wheel aligning on my 75 C3. I´ve changed all bushings.
502 BB, 3.08 rear. With Gear Vendors overdrive on 2.40 .Lower, harder springs.
Most driven at high speed on the german "Autobahn" often 120-150 mph.
Thanks from Gremany/Hamburg,
Kalle

Last edited by mullvamp; Mar 10, 2021 at 09:18 PM.

Mar 10, 2021 | 09:23 PM

cagotzmann

Melting Slicks

Joined: Jun 2011

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Quote:

Originally Posted by mullvamp

Wondering about wheel aligning on my 75 C3. I´ve changed all bushings.
502 BB, 3.08 rear. With Gear Vendors overdrive on 2.40 .Lower, hard springs.
Most driven at high speed on the german "Autobahn" often 120-150 mph.
Thanks from Gremany/Hamburg,
Kalle

High speed stability requires more caster than factory. Factory ~ 2.75 degree's, get as much as you can. This may require offset upper arms, or after market arms with more caster. Best option is something similar to

Specialty Products Company | SPC Alignment | The Automotive Alignment Leaders
After that the standard alignment specs found work well.

Are you planning on DIY alignment or sending to a shop ?

Mar 10, 2021 | 09:40 PM

mullvamp

Thread Starter

Cruising

Joined: Sep 2017

Posts: 14

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Thank you for your information. I´m going to send the car to a shop. Have to keep my standard arms.Whats about "toe in " front/rear?
Regards, Kalle

Last edited by mullvamp; Mar 10, 2021 at 09:41 PM.

Mar 11, 2021 | 12:02 AM

7T1vette

Team Owner

Joined: Jan 2006

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From: Crossville TN

You need a bit of toe-in to keep the front wheels from "wandering" around. At normal speeds (120KPH or less), 1 to 3 mm would be about right. I have no experience with speeds higher than that, but I would think you need to have some amount of toe-in on the front wheels to keep them tracking straight.

Mar 11, 2021 | 08:27 AM

Factoid

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Front toe in is an easy adjustment by turning the tie rod adjusters. In the rear, you need shims. I would pick up a set of stainless steel shims and bring them with you to the shop.

Mar 11, 2021 | 08:37 PM

mullvamp

Thread Starter

Cruising

Joined: Sep 2017

Posts: 14

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Thank you one more time for the answers.
I have taken a set of stainless steel shims with me to the shop. They did a good job.
Front toe in is 0.09 degrees per wheel, (together 0.18 degrees).
Rear toe in is only about 0.33 degrees per wheel. Because of the thicker PU bushing it was impossible to move the trailingarm any more to get other numbers.
Driving feeling is ok for 10 X 15 rims/255/60/15 V
Regards from Germany, stay healthy in this covid time...
Kalle.

Last edited by mullvamp; Mar 11, 2021 at 08:58 PM.

Mar 12, 2021 | 12:01 AM

White 68

Drifting

Joined: Dec 2001

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From: Dallas Texas

Some reference numbers for your shop !

Mar 12, 2021 | 12:33 AM

Haggisbash

Melting Slicks

Joined: Oct 2012

Posts: 2,156

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From: Dunedin NZ.

You can slot the holes in the upper A arms to gain more caster, this will get you close to 4.7 deg positive and is almost undetectable if you have to keep things looking stock.