73 GTV rear wheel tracking - Alfa Romeo Bulletin Board & Forums
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post #1 of 50 (permalink) Old 05-26-2019, 07:37 PM Thread Starter
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73 GTV rear wheel tracking

A buddy was following me and said the tracking is off. The car is tracking as if the rear axle is skewed. What should I be looking for? Is this adjustable in the sense that an alignment could correct this?
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post #2 of 50 (permalink) Old 05-26-2019, 11:45 PM
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Trunion location might be off ... hopefully. Spacers on each side, between it and the chassis rail.
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post #3 of 50 (permalink) Old 05-27-2019, 06:02 AM
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This article describes the problem pretty well:

https://www.google.com/amp/s/jalopni...1828527664/amp

1986 Spider Veloce Turbo
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post #4 of 50 (permalink) Old 05-27-2019, 06:29 AM
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The rear has a smaller track than the front. It may look like its tracking wrong but may not be. Do you have to fight to keep the car straight? Did this just start? Does it change under accel or decel? Get someone else to drive your Alfa and you follow in another car to watch. I think the trailing arm bushings would have to be garbage on one side or the trailing arm to body attachment lose or rusted to a weakened state to get to this situation. Video would be interesting to see.

http://www.alfabb.com/bb/forums/alfa-romeo-club-canada-toronto-chapter/149533-alfa-parts-garage-sale.html
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post #5 of 50 (permalink) Old 05-27-2019, 06:53 AM
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I tend to agree with brad fischer: there isn't a lot that can go wrong with Alfa rear suspensions that would cause the rear axle to become mis-aligned relative to the chassis. But if something were to be amiss, it would be in the trailing arms, so an inspection of your arms and their mounting might be a good idea.

Brad's theory that your friend is simply observing your Alfa's wider front track / narrower rear track is probably the explanation. About the only thing that is adjustable on the Alfa rear suspension is the side-side location of the trunion arm. But even when that is off, the symptom isn't "dog tracking", it's that one wheel is closer to its arch than the other.

I liked the article nealric posted, but would guess that happens more easily on vehicles with leaf spring rear suspensions.
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post #6 of 50 (permalink) Old 05-29-2019, 05:54 PM Thread Starter
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Thank you Pete, Alfajay, Brad, and Nealric. I will read the article tonight. The car has very low miles on it and the suspension is in very good order as far as I can tell. The "problem" is not new in the sense that I never really thought I had a problem until the observation by my friend. The steering is unweighted at center and it goes down the road nicely. There is an ever so slight (and I mean slight) steer to the rear end under accel and decel but I tend to think that is characteristic of the design. If you weren't looking for the slight steer effect you wouldn't notice it. I have driven a couple of 105s with pronounced rear steer and it is nothing like they were. I will do as you suggest and take a look myself. I didn't think about the narrower rear track and its effect. Thanks again.
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post #7 of 50 (permalink) Old 05-29-2019, 06:05 PM
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Quote:
Originally Posted by tuttebenne View Post
There is an ever so slight (and I mean slight) steer to the rear end under accel and decel but I tend to think that is characteristic of the design.
That's not normal and is likely worn trunnion bushes. Common problem. Get the car going like 10 mph and take your hands off the wheel. If you can steer the car back and forth with the throttle then likely the rear trunnion rubber is worn.

I agree the apparent crabbing is likely to be an optical illusion. We did an Alfa drive last weekend and I was thinking the same thing about the GTV in front of me.
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post #8 of 50 (permalink) Old 05-29-2019, 06:07 PM
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A common problem with the original Mini, but usually after the car has been in a significant accident and it was repaired with the front and rear sub-frames out of alignment. Hopefully your Alfa has not had a big hit and it is just the narrow rear end, and follower sitting on the left hand side of their car distorting their view.
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Last edited by PSk; 05-29-2019 at 06:11 PM.
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post #9 of 50 (permalink) Old 05-30-2019, 03:55 AM
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Quote:
Originally Posted by tuttebenne View Post
The "problem" is not new. The steering is unweighted at center and it goes down the road nicely. There is an ever so slight (and I mean slight) steer to the rear end under accel and decel but I tend to think that is characteristic of the design. If you weren't looking for the slight steer effect you wouldn't notice it.
This is exactly the problem I have with my Ochre 1750 GTV.
Here is everything I have done to try and fix this on my thread.
https://www.alfabb.com/bb/forums/sus...ce-wanted.html

http://www.alfabb.com/bb/forums/alfa-romeo-club-canada-toronto-chapter/149533-alfa-parts-garage-sale.html

Last edited by brad fischer; 05-30-2019 at 04:04 AM. Reason: add link
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post #10 of 50 (permalink) Old 05-30-2019, 04:46 AM Thread Starter
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Originally Posted by brad fischer View Post
This is exactly the problem I have with my Ochre 1750 GTV.
Here is everything I have done to try and fix this on my thread.
https://www.alfabb.com/bb/forums/sus...ce-wanted.html

Thanks Brad. I'm first going to take the suggestion to put my own eyes on the car from behind and judge whether or not its the rear track optical illusion. As for the ever so slight steer I experience, the imperfect mounting of the trunion to only one side of the diff would seem to encourage movement of the trailing arms within the compliance of any bushing less than a solid bushing, but I will keep an eye on this.

Last edited by tuttebenne; 05-30-2019 at 04:52 AM.
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post #11 of 50 (permalink) Old 05-30-2019, 07:50 AM
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Thanks Brad. As for the ever so slight steer I experience, the imperfect mounting of the trunion to only one side of the diff would seem to encourage movement of the trailing arms within the compliance of any bushing less than a solid bushing, but I will keep an eye on this.
My car steers left on accel therefore I countersteer right. Which seems opposite of what it would do considering the trunion mount is left of center. What way does yours steer on accel?
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post #12 of 50 (permalink) Old 05-30-2019, 07:56 AM
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It shouldn't be steering at all. Do the test I suggested. If it's steering with the throttle pedal you need to look at your trunnion bushing, and maybe trailing arms.

I've got a 101, a 105, and a 115, and none of them steer with the throttle. It ain't normal.

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post #13 of 50 (permalink) Old 05-30-2019, 08:51 AM
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Originally Posted by Gubi View Post
Do the test I suggested. If it's steering with the throttle pedal you need to look at your trunnion bushing, and maybe trailing arms.

I've got a 101, a 105, and a 115, and none of them steer with the throttle. It ain't normal.
Check out the link to my thread I posted in #9 (4 posts back) on the work I did.

http://www.alfabb.com/bb/forums/alfa-romeo-club-canada-toronto-chapter/149533-alfa-parts-garage-sale.html

Last edited by brad fischer; 05-30-2019 at 08:52 AM. Reason: add info
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post #14 of 50 (permalink) Old 05-30-2019, 10:55 AM
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There is an ever so slight (and I mean slight) steer to the rear end under accel and decel but I tend to think that is characteristic of the design.
No, it's not, it's a sign of either a worn trunnion bush, or soft trailing arm bushes.
I know you say the car has not done many miles, but in how long ?
Trunnion and particularly trailing arm bushes are key to a 105 rear end's handling.
Trailing arm bushes can look ok, but are actually goosed.
Both of my two previous Coupes (when I aquired them), showed steering from the rear end under acceleration & deceleration.
I removed the trailing arms and thought the bushes looked ok. They weren't.
In both cases I renewed both ends of each arm, and the issue disappeared.
If they're more than 10 years old, they need changing, as the rubber deteriorates even when not in use.

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post #15 of 50 (permalink) Old 05-30-2019, 11:52 AM
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No, it's not, it's a sign of either a worn trunnion bush, or soft trailing arm bushes.
I know you say the car has not done many miles, but in how long ?
Trunnion and particularly trailing arm bushes are key to a 105 rear end's handling.
Trailing arm bushes can look ok, but are actually goosed.
Both of my two previous Coupes (when I aquired them), showed steering from the rear end under acceleration & deceleration.
I removed the trailing arms and thought the bushes looked ok. They weren't.
In both cases I renewed both ends of each arm, and the issue disappeared.
If they're more than 10 years old, they need changing, as the rubber deteriorates even when not in use.
I replaced all my rear end bushes and still have the problem.

http://www.alfabb.com/bb/forums/alfa-romeo-club-canada-toronto-chapter/149533-alfa-parts-garage-sale.html
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