SCCA ESP Thread

[DickR]

so true rear coil overs are not a big thing on Mustangs....

Where would they mount?

If they use the shock mount the involved structures may (probably?) are not designed to carry both shock and spring loads.

If they use the spring mount the shock travel will be greatly reduced which results in relatively poor shock performance since shocks need as close to a 1 to 1 motion ratio as possible for best performance.

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[murphyslaww]

Makes me wonder how much faster the S550 will actually be.

 

[Schu]

Where would they mount?

If they use the shock mount the involved structures may (probably?) are not designed to carry both shock and spring loads.

If they use the spring mount the shock travel will be greatly reduced which results in relatively poor shock performance since shocks need as close to a 1 to 1 motion ratio as possible for best performance.

 

[DickR]

Schu - I assume that the rear coilovers in the picture you posted would mount to the oem upper shock mount location. The questions are: Is the body at the upper shock mount and the suspension arm at the lower shock mount designed for both shock and spring loads? Also is the upper shock mount itself designed for both loads?

 

[DickR]

FYI - This seems to be well written and interesting description of our suspension.

http://www.edmunds.com/ford/mustang...15-ford-mustang-gt-suspension-walkaround.html

 

[boardkat]

It looks like for now, my first Nationals will be in an S197 tirewarming for Eric Yee in F-Street.

nice! eric and i did battle in FS back when the S meant Stock
have fun in his car, he's come a long way in the dev, and is now on the same shocks i had just purchased before my car got totaled. i expect they'll do the things the car couldn't on the OTS valving.

What does anyone think about the STP proposal ? I'm going to guess that they will add the 15' to it eventually.

i ordered a set of 285 RE-71R to mate to a set of 19x10 for the street. i definitely plan to test it back to back with my 315 rival s/18x11 setup to see how it compares. kit (gauthier) is also local to me, and intends to give it a go in his S197 boss, at least locally next year. so i'll have a good sense of where the S550 stands, even if not immediately eligible. if you see them making the car legal for STP and me making the switch from ESP, even if they limit us to 285s, that'll be a good indication of how competitive i think the car will be

 

[dontlifttoshift]

I don't know how much front spring you are running, but with 500# on the S197 I had an inch of freeplay in the front at full droop.....it wasn't an issue. If you had room for a tender and guide, I'm guessing you had more space than that.

I though notching the strut tower was a no-no....or is that just ST?

 

[boardkat]

I don't know how much front spring you are running, but with 500# on the S197 I had an inch of freeplay in the front at full droop.....it wasn't an issue. If you had room for a tender and guide, I'm guessing you had more space than that.

I though notching the strut tower was a no-no....or is that just ST?

800# and more than an inch, yeah.

you can modify strut mounting holes for camber.

 

[dontlifttoshift]

I misread and thought you opened up the center hole.

Carry on:cheers:

 

[modernbeat]

Rear coilover conversion is not legal for Street Prepared. Springs must be the original type, and mount in the original location. See rule 15.8.A in the SCCA Solo rule book.

15.8 SUSPENSION
Vehicles may only exceed the allowances of Section 13.8 as specified herein.
A. Ride height may only be altered by suspension adjustments, the use of
spacing blocks, leaf spring shackles, torsion bar levers, or change or
modification of springs or coil spring perches. This does not allow the
use of spacers which alter suspension geometry such as those between
the hub carrier and lower suspension arm. Springs must be of the same
type as the original (coil, leaf, torsion bar, etc.) and except as noted
herein, must use the original spring attachment points. This permits
multiple springs as long as they use the original mount locations. Coil
spring perches originally attached to struts or shock absorber bodies
may be changed or altered and their position may be adjustable. Spacers
are allowed above or below the spring.

 

[murphyslaww]

It seems there is a similar rule in SM?

No relocating the spring?

Off topic, but I'm considering moving and seeing how close I can can get it to 50/50.

 

[Grintch]

Rear coilover conversion is not legal for Street Prepared. Springs must be the original type, and mount in the original location. See rule 15.8.A in the SCCA Solo rule book.

What about 15.5.C?
Any shock absorbers may be used. Shock absorber mounting brackets which serve no other purpose may be altered, added or replaced provided that the attachment points on the body/frame/subframe/ chassis/suspension member are not altered. The installation may incorporate an alternate upper spring perch/seat and/or mounting block (bearing mount).

 

[dontlifttoshift]

That is overruled by "can't move the spring from original attachment points". If the spring was originally mounted on the damper, then 15.5.c applies.

 

[Grintch]

...and except as noted herein, must use the original spring attachment points.

My rules lawyer says it has a loophole. It already says "herein" that shocks can incorporate alternate spring mounts.

 

[dontlifttoshift]

.....and where is the part that says, go ahead and put coilovers on. Alternate spring mount doesn't mean you can add a spring mount where they do not exist. Doesn't say you can, so you can't.

Write a letter for clarification.....maybe SCCA can explain it in different terms for you.

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