Top-Gun

The next stage in getting my car sorted is a corner balance and full alignment. Before I spend the time and money doing this properly, I want to make sure my setup is sound so I don't have to do it again for awhile.

I want the car at ROW sport height and alignment specs, it will primarily be a street toy with a few DE's thrown in at Mosport. Not looking at building a hardcore track appliance, just want a sound setup to develop my skills on.

The car currently has the following changes from stock;
- Bilstein HD's
- Eibach springs
- Tarett rear toe links with locks (oem links were toast)
- Walrod bushings in the front lcas
- 18x8 and 18x10 wheels with 225/265 rubber

The HD's and Eibachs came with the car; from searches it appears the Eibach springs are not held in high regard. I also understand the HD's don't have optimal valving for the 993 chassis, but I'd like to keep them for now (better shocks are not in the cards at the moment).

What's the best spring choice for me (tons of opinions via search but little technical basis)? Would it be worth me swapping in some M030 or H&Rs over the existing Eibachs or a waste of time/money? Are there other options out there such as racing springs which could be purchased in appropriate rates?

I plan on also adding some turbo or M030 sways which I presume would factor into spring selection. Beyond these mods I don't plan on taking the suspension much further until my driving skill warrants it.

Thanks.

pp000830

The issue is do you like the ride and level of control you have now. If unsure I would see if you can get some seat time in some other Rennlister's car for a qualitative comparison. Here is a chart you may find useful"

TJ993

If you are doing DE events I would suggest going directly to the RS Sway Bars.
The benefit is Adjustability. Get your Parts from Sunset.

I hear the Turbo Sway /s is a n Option although the M030 is close.

I have had the Bilstein's with M030 Chassis & M030 22MM Front & 20 MM Rear Sways for 2 Years.
I would also suggest you remove your rear sway bar Bushings to ensure they are not worn out. Replacing these will chanage your ride.

Initially I spent a few days at the Dentist But the HD's Struts settled in to a good Highway / Cornering ride But Not too compatible with City Roads. Mind you I am also running ROW Springs so she rides Low or Lower - Not as Low as the PSS 9 or 10 though.

Top-Gun

Thanks for the info,

I don't mind how the car drives now but I haven't spent any track time with it so I wouldn't know what I was missing with a different spring.

My primary concern was that the rates/height of the Eibachs were wrong for the HD struts on a 993. I haven't been able to drum up the rates for these springs to compare to M030's or H&Rs.

As a data point you can in fact obtain ROW sport ride height with Eibachs and Bilstein HDs. You end up with the collars almost to the top on the front but it's doable and leaves a few threads for fine tuning corner weights.

fozzie bear

For what it's worth, my independent service shop recommended Eibach sport springs with Bilstein HDs as his go-to upgrade from stock.

However, I ended up going with full PSS10s, so I don't have hands on experience myself with this combination.

My thought would be - try your current setup in autocross or a DE and see if you're happy with it at that level. If you're not one for autocross or DE's, and you don't have any specific complaints about feel and handling on the road, I'd leave well enough alone. That's my approach at least.

pp000830

Interesting as I believe the H&R coilover kits include rebranded Bilstein struts valved to match the H&R progressive springs that are included in the kit.
Andy

Bill Verburg

Nothing wrong w/ Eibach springs, they should be marked w/ a series of #s
something like 0900.225.0600, this is the length in mm, ID in inches and spring rate in #/in.

Check yours to see what you have

I'd strongly urge you to add Elephant sport rubber bushes for the front A-arms and RS rear A-arms and RS rear KT link, the sole remaining rear link is the camber link, stock is ok for that if it's in good shape.

ride height is determined by a combination of spring length and collar positioning, the ratio of front to rear spring rate determines the basic handling traits of the car, you can use much heavier springs w/o a deteriorated ride if the shocks receive a digressive revalve, w/ the stock shocks, The usual split f/r is 100 to 200#s, lower is more under-steer, higher is more over-steer, split the difference if you don't know what you want, ie 150# difference from 600/750 w/ digressive shocks or 400/550 w/ stock Bilsteins. For referance stock RS is 250-308/375-508(variable rate), M030 150-200/225-275

RS sways are a definite plus

Knight

+1.

Based on your post, you are already starting at a good platform.

If you do purchase turbo sways, make sure you get the ROW rear sway. This is thicker vs. North American Turbos.