Corner weighed my 78 Sport Sedan - Alfa Romeo Bulletin Board & Forums
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post #1 of 16 (permalink) Old 05-04-2019, 07:31 PM Thread Starter
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Corner weighed my 78 Sport Sedan

Here's the results
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It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
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post #2 of 16 (permalink) Old 05-04-2019, 07:34 PM
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Does that indicate that there is too much weight on the front left? Can it be corrected by adjusting the left torsion bar?

Ed Prytherch
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76 Suzuki GT500
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #3 of 16 (permalink) Old 05-04-2019, 07:40 PM Thread Starter
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Originally Posted by alfaparticle View Post
Does that indicate that there is too much weight on the front left? Can it be corrected by adjusting the left torsion bar?
I don't know......LOL. I thought you would!!

Now, I'll add something. Without me in the car, the measurement from ground to fender lip LF is over an inch higher than RF.
Put my 195 pounds in the driver seat and the LF is only 1/4" higher than RF.
The Sport Sedans have real soft suspension.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #4 of 16 (permalink) Old 05-04-2019, 08:05 PM Thread Starter
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Originally Posted by guillotineFI View Post
Always disconnect sway bars for cornerweight, adjust as needed and then with SB after you are done and happy without. Then, set SBs for same as without.
I never thought of that.

It's just a street car and I only weighed it because my buddy had a set of scales.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #5 of 16 (permalink) Old 05-04-2019, 08:51 PM Thread Starter
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Honestly, I don't know at what percent of CW you would be able to tell any handling issue on the street. I doubt you would be able to tell. Just commenting on the theory, and of you went to the track with it, you could definitely make some spring/SB adjustments - assuming you have scales handy.
Scales are at my disposal. I found it interesting that it was as close as it is. And, 50/50 front to rear.

It's nice having friends with scales and chassis dyno.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #6 of 16 (permalink) Old 05-06-2019, 09:20 AM
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Cool info - thank you. You can take around 110 lbs off by removing the bumpers. Makes a difference you can feel.

On the suspension, you get used to it and its part of the drama. I drove my BMW 335i after the Alfa and it felt absolutely boring at any speed under 75 mph.
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post #7 of 16 (permalink) Old 05-06-2019, 01:45 PM Thread Starter
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Cool info - thank you. You can take around 110 lbs off by removing the bumpers. Makes a difference you can feel.

On the suspension, you get used to it and its part of the drama. I drove my BMW 335i after the Alfa and it felt absolutely boring at any speed under 75 mph.
I hate those bumpers. I discharged the absorbers and slid them back. I wish the weight wasn't there and it would look good without the rear.
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It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #8 of 16 (permalink) Old 05-07-2019, 06:54 AM
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The goal of corner weighting is to get the cross weights (the sum of the left front and right rear, and the sum of the right front and left rear) as close to 50% as possible to ensure similar performance in left and right turns. That is the theory, at least.

In your case, you would lower the left front by a small amount in an attempt to transfer some weight to the right rear, which would also have a small effect on the other corners. I assume that your Alfetta is stock and doesn't have adjustable rear coilover springs, which limits your adjustability.

I am not a fan of going overboard with fine-tuning the corner balance of a street car with rubber bushings, as the friction of those bushings affects the results (spherical bushings are better for this). Plus, you often end up adjusting the ride height of some corners too much in an attempt to get the cross weights perfect, which means that the suspension geometry is slightly different side to side, which kind of defeats the purpose of corner balancing in the first place.

Real race cars corner balance by moving weight around the car!
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post #9 of 16 (permalink) Old 05-07-2019, 07:00 AM Thread Starter
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I don't have any real goal here other than satisfying curiosity, and a friend who has the scales and a chassis dyno at his home.

I am gonna drop the LF down that 1/4" because it bugs me and I'm putting my Koni Yellows on soon. Should be here today.
I'll weigh it again at some time.
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It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #10 of 16 (permalink) Old 05-07-2019, 03:14 PM
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I hate those bumpers. I discharged the absorbers and slid them back. I wish the weight wasn't there and it would look good without the rear.
Oh, good for you. they were such a PITA to remove I did not wan to reinstall them. To me, the front bumper mounts sticking out looks worse and I thought the whole thing looked better. I'm either having a small bumper/light bar fabbed for the front or hanging driving lights off of them and putting some plates on the back or gluing some chunky rubber squares in that spot. Mine is black though, so it blends a little better.

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post #11 of 16 (permalink) Old 05-07-2019, 03:51 PM
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I think the bumperless look suits the Alfetta sedans as much as it does on a Stepnose. It really lightens the look, even with the smaller Euro bumpers we got here in OZ.
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post #12 of 16 (permalink) Old 05-07-2019, 05:58 PM Thread Starter
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I think the bumperless look suits the Alfetta sedans as much as it does on a Stepnose. It really lightens the look, even with the smaller Euro bumpers we got here in OZ.
It really does. Unfortunately the 4 bolt pads for the bumper look awful.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #13 of 16 (permalink) Old 05-07-2019, 06:10 PM
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Originally Posted by slowcreek View Post
I don't have any real goal here other than satisfying curiosity, and a friend who has the scales and a chassis dyno at his home.

I am gonna drop the LF down that 1/4" because it bugs me and I'm putting my Koni Yellows on soon. Should be here today.
I'll weigh it again at some time.
Home chassis dyno? Awesome! I have to trek down to LA this Friday to get my Porsche 944 Turbo dynoed, there aren't any in the Santa Barbara area, home or otherwise

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post #14 of 16 (permalink) Old 05-07-2019, 06:14 PM Thread Starter
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Home chassis dyno? Awesome! I have to trek down to LA this Friday to get my Porsche 944 Turbo dynoed, there aren't any in the Santa Barbara area, home or otherwise
Rather handy. 10 miles down the road.

I haven't dynoed the sport Sedan, but I have my Spider.

It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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post #15 of 16 (permalink) Old 05-08-2019, 08:27 PM Thread Starter
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Got the car level with me in it. I'll weigh it again.



Installed a pair of Koni Yellows in the front to match the Yellows in rear.

Now I can get it aligned with me in it. I've never had a car with such soft suspension. My measly 190 pounds changes the ride height in the LF almost 3/4"!!

I was surprised the front Koni Reds I removed were still in good shape. The rear ones were shot!!

Took a spirited run to the store and back. I'm pleased.
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It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS
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