mark kibort

Thats the problem with almost ALL of our cars in stock, or eibach form, but no one wants to admit. cutting a coil or even a half of a coil is the way out of this problem. 1 coil was fine up front. scot, still is a little too high up front. and about right in the rear. when we get around to it, we will probabably cut another 1/2 coil out of his front spring.

devilinblack

That's standard on the early cars. If I remember correctly Jim B. mentioned that you had to change to the shorter springs when upgrading to the adjustable springs on the early cars, or something. My front end is pretty high and I've gotten used to it but it would be nice to bring it down a bit.

GRTWHT

Hello Mark. So in a static position looking at the front wheel clearance to the top of the front wheel arche, what would be the ideal distance in height between tyre and fender?
The lower the better?
Tyre just in line with the top of the fender arche?

I have an '81 928 with stock springs and shocks (white marked springs and boge shocks) and does sit a little on the high side compared to same year model 'S' cars. Fender arche has aprox 1" gap above the top of the tyre (225 tyre, 16X7" wheel)
I could drop the front by 1" and still be street practicle and have a better stance but to replace springs or put later model height adjusters in seems to much $$$ to bother with.

So how much spring to cut do you reckon.

Glenn
'81 928
Australia

mark kibort

old or new, the cut spring technique will work. S4s have near the same problem. The reason that it works so well on the 928, is that the spring purch has a little cut out for the end of the coil, so that when you cut the spring, the end of the spring that is cut, fits where it is supposed to go as if it wasnt cut.
And, it can be rotated to fit the purch even if you only cut out a half of a coil.

svp928

Hmm, I have the Bistein/Eibach setup from 928Int'l, and didn't have to cut anything to get ride height I wanted. I have room left to lower the car even more than it is now. I do remember taking the spring/shock assy's apart a few times before I got them to where I had enough adjustment for what I wanted...and I don't think I left anything out. Perhaps that has changed over the years?

GregBBRD

I absolutely refused to even open that thread! Saw it and just skipped right over it. Knew that there was nothing good happening there.

mark kibort

You know me. Ive hacked up stuff before, but nothing life endangering.
When I thought about the say, 5% chance that he could be going 120mph and hit the brakes only to have the calipers fly off the car, It put chills down my spine! That is down right scary!

mark kibort

You know , come to think of it, my 84 had a great set up that needed no spring cutting. way too soft, and was the reason for going to the devek level II stuff, but i do remember, i got the springs from 928 intl and got the shocks somewhere else which were Bilstiens. I wonder if the shock threaded area was different or the springs were different sizes or lengths. I dont remember who ended up with my set up, but they were pretty good! Scots needed to be cut though and I dont know what the difference was.

mk

Jean-Louis

Mark this is what I did on the blue race car you saw at RA, after I removed the weight from the front of the car I had to cut 1.5 turns of spring (started with 1 turn but had to cut 1/2 more). Those springs are on the red race car now even with the supercharger on it. Car is stiff but handle pretty good on the track as you know.

mark kibort

Well, there you go. It did look good in all the track sections at RA. what shocks were you running?

Jean-Louis

konis on the four wheels.

mark kibort

There you go folks. 3 well handling race cars with some of the fastest times on those tracks, with cut springs. The method is race tested and cost effective.

GregBBRD

I'll let all the Formula One, Indy Car, and the Nascar guys know. You tell the rest.

mark kibort

Now you are making me laugh! Have you seen how NASCAR guys change spring rates? Wedgies!!!! ha ha ha!

a spring is a spring. cut it and it is a stiffer spring, unless it is progressive, or has fitting issues at the ends that fit the purches. In the case of the 928 springs, they are configured in such a way that they can be cut with no adverse issues. In fact, there are very few springs that can be cut like this.

It just so happens, that the shock and spring package (peformance and stock) can be stiffened up with a shock coil spring cut. what you end up with, is a more optimal ride hight. (good). more adjustable ride hight (good), stiffer spring rate (good if you want this), and a fit that is transparant to the orginal design. (good). I cant think of any thing bad that could come out of it, especially if it was on a street car, besides, over powering the shock or too stiff a ride. (Both of which does not occur on the street or sport set ups avaible for 928s).



mk

Imo000

Mark,

This can be a dangerous setup. When the back goes airborn the spring will become loose and can dislodge/shift. Then when the car comes down on the shifted sping, it can get ugly really fast. This is the main reason cutting springs is illegal. Yes, nothing has happend to either of the cars yet but it could easily do so. You guys are playing with fire.