Recommendations for Shock Absorbers - Page 2 - Vintage Mustang Forums
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post #16 of 54 (permalink) Old 08-12-2019, 05:18 PM Thread Starter
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I see the main difference (on SoRT at least) between "Street" and "Sport" is the spring rate.

Street - Vintage Mustang specific custom tuned Street valving is ideal for spring rates up to 600lbs

Sport - Vintage Mustang specific custom tuned Sport valving is ideal for 500-700lb spring rates

Is there a way to determine the spring rates of springs that came on the car or even what was typically on an early 1965 Mustang? According to this site it seems that the rate is 235 lbs./in.

I ask because this car, when I purchased, had been restored but not to anything really in track form. I'm thinking that the spring coils are probably 'stock' but I don't know what that would really mean or how to verify.

Also, if the 235 lbs./in. is around the rate, it seems that the "Street" covers the spring rate by over 2x whereas the Sport would be 2-(almost)3x.

Thanks so far for all the input! This is really useful

1965 Fastback Mustang
Rangoon Red
289ci V8, 4-speed Toploader

Last edited by ricer333; 08-12-2019 at 05:23 PM.
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post #17 of 54 (permalink) Old 08-12-2019, 05:47 PM
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The stock '65 Mustang rates are below 500 #/in in the front. Even the "GT" spring is low.
If it's mainly a street-destined car, street valving is for you. If you want it a little more
crisp, go sport.

Or put a Koni classic on it and be done.

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post #18 of 54 (permalink) Old 08-12-2019, 08:19 PM
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In many cars, I've had both the street and the sport. In a stockish mustang? Streets. I've got the street valving in my SorT front and rear and they work very very well.

I've also run the same car with Koni's and bilsteins. (non mustang) and would pick the bilsteins 9 times out of ten. Although thats only my personal preference.
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post #19 of 54 (permalink) Old 08-12-2019, 09:24 PM
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I believe the rear Bilstein shocks are the same across all valve selections. The fronts are what change...street, sport, race.
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Regards,
Patrick
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post #20 of 54 (permalink) Old 08-12-2019, 09:35 PM
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Quote:
Originally Posted by patrickstapler View Post
I believe the rear Bilstein shocks are the same across all valve selections. The fronts are what change...street, sport, race.
And in my case cured an extreme wheel hop issue 100%!

65 C Code hardtop from California still wearing it's original paint.
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post #21 of 54 (permalink) Old 08-13-2019, 05:26 PM
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Originally Posted by Huskinhano View Post
One thing I never saw coming was the effect a free moving joint over a joint that binds and resists movement and it's effect on ride quality, spring and shock rate. ... However like I said free moving joints over binding joints effect things.
To go further down this path, consider getting Opentracker's roller spring perches. These perches use sealed roller bearings as the pivot point instead of a rubber bushing. This upgrade provides a huge gain in ride quality, responsiveness to the road, stability under braking and handling. The entire weight of the front end rides on these two pivot points and the stock rubber bushing greatly increases the effort required for the suspension to move (taken from Opentracker's website ) I use them and wonder why Ford didn't just spend the few extra pennies/dollars to make them standard equipment, they are that good.

[/SIGPIC]67 Fastback GT -- original colour (Frost Turquoise), original 289 A code engine. Pic is of me and the Mustang taken in May of '67, with original F70-14 Wide Ovals. Same car is now restored to "as new" but 3 speed tranny swapped out for 4 speed back in the mid '80's, with tach dash, original Equalock rear, Koni's, Opentracker UCA, LCA, roller perches and idler arm, roller bearing pedal cluster, Cibie headlights, 4100 carb (old 4300 put in storage probably forever)
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post #22 of 54 (permalink) Old 08-13-2019, 05:39 PM
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post #23 of 54 (permalink) Old 08-13-2019, 06:54 PM
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Originally Posted by jfstang View Post
To go further down this path, consider getting Opentracker's roller spring perches. These perches use sealed roller bearings as the pivot point instead of a rubber bushing. This upgrade provides a huge gain in ride quality, responsiveness to the road, stability under braking and handling. The entire weight of the front end rides on these two pivot points and the stock rubber bushing greatly increases the effort required for the suspension to move (taken from Opentracker's website ) I use them and wonder why Ford didn't just spend the few extra pennies/dollars to make them standard equipment, they are that good.
Also the bushing in the lower arm.

Actually Ford did. Not sealed roller bearings but a greaseable bronze bushing works just as well.

Tom

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post #24 of 54 (permalink) Old 08-13-2019, 09:32 PM
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The double rollers are even better. The shock and coil spring are permitted to pivot independent of each other.

https://opentrackerracing.com/produc...pring-perches/

Regards,
Patrick
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post #25 of 54 (permalink) Old 08-17-2019, 04:53 PM
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The double rollers are even better. The shock and coil spring are permitted to pivot independent of each other.

https://opentrackerracing.com/produc...pring-perches/
So how much difference can you feel over the single roller?

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post #26 of 54 (permalink) Old 08-17-2019, 05:11 PM
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Speaking as an ancient road racer, for the cost, I would expect only a serious full-time road racer would consider. Certainly, overkill for the average street Joe. However, the single roller perches would be a nice perk.

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post #27 of 54 (permalink) Old 08-17-2019, 09:16 PM
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So how much difference can you feel over the single roller?
I’m not good enough to know.

Regards,
Patrick
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post #28 of 54 (permalink) Old 08-17-2019, 09:38 PM
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Nothing like a good pair of (MONROE) MONRO-MATICS PLUS for me! That's all I need.
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post #29 of 54 (permalink) Old 08-18-2019, 12:57 PM
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I’m not good enough to know.
Well, I have to muscle the top of the shock over to get the bolts in so there is some bind there.....

1969 coupe
372 Cleveland, 4 speed, 9" T.50 Trac Lock axle, Toploader, Global west suspension, Big Lincoln Trans Am Brakes front, Eldorado caliper/ MK VII disk rear.
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post #30 of 54 (permalink) Old 08-18-2019, 01:04 PM
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Do you at least have the single rollers? I can install my Bilstein’s with one hand on the shock and one hand installing the bolt. Now that might be different if I had race valved Bilsteins...which is what I need.

Regards,
Patrick
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