streetsnake

I’m preparing for my ‘79 928’s wintery slumber and want to redo the suspension while she’s stuck in the barn. The problem I have, and has been discussed, what combination of springs/shocks is best. Mine will be a street car with at most, a little spirited driving here/there. Looking through all the threads I’m quite confused. I’ve looked through Roger’s site and came up with the below:
Front: 92834305507BO non adjustable unless other parts are added and I don’t know which parts to get
Front: 92834305506BIL Out of stock and states they need shorter springs from an ‘84

Rear: 92833305112BIL
Rear: 92833305117 Option M474
Rear: 92834305507KONI Internally adjustable
Rear: 92833305116KONI Internally adjustable Out of Stock

and then the springs come into question. Which spring for which shock, what additional parts are needed to make sure I can put the together and mount properly and where do I get everything? Other options? I appreciate the help. It’s been awhile since I’ve asked a bunch of remedial questions but you guys have always delivered.

Speedtoys

_I_ think you will like the M474 optioned dampers. The Konis are a shock without a spring, trying to be both.

Getting to the adjustable springs and perches, is a nice place to put an OB, and -while you are there- later model hubs/brakes???

and dont forget a king's ransom in rubber shock mounts, and every bushing...because you can still get them...right now. Every single one.


Mount properly? A spring compressor?? Pay a local shop a few bucks to assemble if you dont want to use one yourself, make sure to take the drawing so they know the order of parts in the stack...check it before you leave.
Mounting ON the car, pretty simply things can only go in one way, watch the orientation of the bottom of the rear shock, they're at a slight angle...and the direction of the washers in that assembly as well on the Pin.

streetsnake

So these in all 4 corners?
https://928srus.com/products/928-333...1e8f82a2&_ss=r

I believe I have Bilsteins in the rear currently (they’re adjustable), not sure on the front. The front spring has a 2 blue marks. This where it all goes to crap for me on which parts to get and which springs. Help a brother out? Lol

yes, I will be replacing everything rubber.

Speedtoys

The Boge's are measurably stiffer, and the OB is significantly lighter...if me, Id keep it on OE or M474 option shocks...if you're not counting lap times, the comfort factor is also, measurable. (Insert your own age/ailments/comfort requirements here)

@The Forgotten On Can give a good list of how/what to get to what/where much more than I can.

hwyengr

You ever order parts and realized you had ordered them before and just forgot? I’m pretty sure I did that with a pair of the front 06 Bilsteins, if you’re interested.

hacker-pschorr

Are you looking to only do springs / shocks or possibly all the rubber bits too? What kind of a budget have you set for this project?


Please stop making what you think are factual statements which in fact you have zero real knowledge of but are instead quoting other people who may possibly have their own agenda for making such statements.

streetsnake

No, I’m looking to do the entire suspension, shocks/springs, redone control arms, rubber pieces, etc. Budget is what it takes to get the job done properly. I want to maintain look of period correctness and hopefully was available at the time. I’m just trying to go through the PET to get exactly what I need to get to replace and what rehabilitating can be done. @Speedtoys what do you mean by the BO option. Which one are those.

Speedtoys

No.

You're not a Koni engineer, so...here we are. And if you WERE I would ask you how to specifically dial in your shock for any given spring rate.

Debating a glossy magazine shock. built for nothing in specific, tunable for nothing specific, that 'feels so good'.

Funny I dont see these wondershocks on race cars.

Darklands

I would not prefer the Bilstein shock on a light car. My 86 S has a better ride quality with the M474 Boge red sports than the Bistein setup on the 84 S.
Both cars have all rubber parts new.

To be fair, my shop here prefers the Konis, valves half closed, he says the Koni is most forgiving if the road has little steps.

From a budget standpoint the Boge grey are a real bargain versus the other solutions.

How fast do you go? If the car is show and shine and the owner is only cruising you can use the cheapest solution.

Doing the whole setup is 5.000,00 $ without shop costs.

Petza914

I like the sport springs and Bilstein shocks.

soontobered84

I have used Internally adjustable Konis on every 928 I have owned. I have used them with both stock springs, and with Eibach progressive springs. I have them adjusted from full light to midway depending on which car I have them installed. I have never set the Konis to full-hard because I don't enjoy my teeth rattling while I drive. If I don't like the setting after they are installed, I can adjust it with the adjustment tool. Not that big of a deal for Konis, but impossible for Boges or Bilsteins.

Your front shocks/springs assembly is not height adjustable currently (Porsche didn't make the front end adjustable until 1984 IIRC) . The springs for an adjustable front are shorter than what you currently possess. If you can buy new, buy new. If they aren't available, buy used from 928Intl. If you tell Mark what you are doing, he can set you up with everything you will need to make your front ride height adjustable.

Speedtoys

Ya...Mark's a good source for "what parts do I need..."

IcemanG17

the old motto of "don't upgrade anything, just make it work right....then worry about upgrades" rings true.

Pretty much every 928 in existence has ancient bushings made with 70's (at best) technology....

Its not a small job and the variables of what one owner considers a nice balance between ride and handling is HUGE...

Take a look at my avatar...thats a full race heim jointed 928 on custom valved bilsteins with 800lb front springs....a stock 928 can NOT compress that much (I'm not saying that much compression is a good thing either) But what that race 928 needs is worlds different than a pure street car...

The only thing they share....is old bushings! If I had a 928 again.....it would get a fresh set of newly designed bushings....one of the first jobs I would do

Speedtoys

".it would get a fresh set of newly designed bushings"

s/newly designed/new

Fixed it for you.

Nothing wrong with the OE ones, theyre just either deformed (shock mounts and rear upper arm) AND also have lost about half of their stiffness...and a few, no longer operate as designed, at all. (Front lca)

soontobered84

Konis ARE adjustable in situ. Bilsteins are not adjustable at all. Boges are not adjustable at all. The nice thing about having an adjustable suspension is that you can RAISE the car to avoid driving below 140mm, which I have done. I like and enjoy the way my car handles.
I would submit that if I handed you my car and said "Do what you do" I would NOT be blown away at all. I would have YOUR car, the way you want it, and not MY car, the way I want it.