Alpine003

Thanks for the update.

Unfortunately, I've been waiting for mine since June 16th. The ones that finally arrived a couple weeks ago were the WRONG ones. Patiently waiting. I hope they are worth it.

Zurca

Where are you guys ordering them from? THANKS!

Alpine003

I ordered mine directly from the ISC NA website. Just be prepared to wait if they don't have stock on hand(which they most likely won't). There's slightly cheaper places online like Pelican Parts and such.

timmay77

I should probably update this thread.

With the 12kg springs and the dampeners turned full hard, I was still bottoming out on large bumps Andrew from ISC and I were discussing the issue when he replied this,

"It's interesting how it was fine at first then began to happen again, did you check and make sure the preload didn't change or anything?"

I checked everything, and replied to his email. That was October 13th. I sent several other emails trying to keep the communication going, but haven't heard anything else. So I guess I am on my own.

The E61 is my DD, I want a smooth ride, this has always been the goal. With the current set up, I bottom out on large bumps, and the ride is a bit rough. So I decided to put some new stock dampers on the rear, (Sachs) and replace the front springs with 13.5kg springs. Yes, they are stiffer, but I can turn down the dampening on the shocks from full hard. The rear ISC shocks are just too "sporty" for my taste. They will be up for sale. They only have about 5k miles on them.

I ordered some Eibach 13.5kg springs from Summit. I also ordered some Sachs springs from Rockauto, which are the OEM supplier (at least in the E39 world).

Pictures:

rice_rocket88

I've been following this since I'm not sure my direction.. But unless I'm wrong, the godspeed ones have something like 8kg springs, which some might argue are too soft? But I want soft, but low stance of my car and a little bit better handling that I figure can be adjusted by the same mono shocks that isc and godspeed have.. Would I be wrong in this assumption? I'm happy with the h&r springs minus the pounding bumps or really rattly roads.. so I think either might make me happy unless 12kg isc is too hard!

timmay77

If you put 8kg springs on your car you will be riding around on the bump stops......

Did you read my post? I'm stepping up to 13.5kg.

rice_rocket88

I understand the theory of the spring rate and bottoming out.. so yes the higher spring rate would stop that from happening (ie higher kg force to compress a distance), but it would mean the rest of the ride would be super stiff. If the difference between bottoming out would be how low/how much suspension travel, I might raise the car height higher in favor of a smoother ride. I've fought over this idea, which it seems I can't have it both ways. My residential and city streets are quite uneven which even at low speeds it's quite rattly. I only encounter one big dip which would be the bottoming out. So if I went with 13.5kg wouldn't that mean every rattly road would only get worse, to the benefit of not bottoming out once? I guess what I'm wondering is, if you're trying to get the overall stock feel I would think the softer springs with less dampening would be better than harder springs with whatever dampening (assumng less dampening to compensate) which would be better..

Please nobody quote me on this since I'm actually not sure.

timmay77

With this design of coil over, your ride height has no effect on suspension travel (of the spring). Your adjustment of the ride height is made at the lower mount not at the spring.

From the 3 days of riding on the 13.5 springs, it is not stiff at rattling me at all. Dampening has a huge effect on ride quality.

rice_rocket88

Boy I wish I was closer to go for a ride.. now I'm unsure again which avenue I want to head down.. By the way I had a ride in a wagon with KWV3's and it was nicer, but not the "OMG it's the best thing ever". As long as the new ones I put in is somewhere in between I'd be happy. I certainly don't think the $2K+ price is worth the KWV3 difference. If it were proportional to ride quality and price sure.. but I think my rating would be.. stock@ 10/10 for baseline. H&R on stock shocks at 6/10 KWV3 maybe at 8/10 max.

rice_rocket88

Hey good news Timmay77 I actually tried to start searching again for the actual spring rates. Firstly.. I can't find anything about the STOCK spring rates. Secondly I can't find anything about the actual spring rate of the H&R that I have now.

Now the funny thing, which would make you happy ... is I found a few places that tell me the spring rates of the godspeed set. Weird thing is directly on their website has NO information at all.. but on ebay AND amazon they have a pretty good description and...

The FRONTs are 14kg springs, and the REAR is 8kg. So in effect since I am a sedan vs your wagon we can talk ab out the front spring rate, and the fact that the godspeed set is actually going to be in the same direction you just went with the 13.5kg.