I'm looking into putting stiffer springs on my koni coilovers, and want some input on which springs to go with. I know GC uses eibach springs while TCK uses the VVS springs. It seems the eibachs are significantly cheaper. Are the VVS springs that much better? Are there any other options out there?

I've heard the VVS are lighter, but the "ride improvement" is due to TC Kline's custom valving (as I understand it), while GC uses off-the-shelf Koni adjustables.

In other words, you'll lose a little weight on each corner by running the VVS... but I don't think you're going to get a TCK-quality ride.

VVS have a longer travel because of the shape.

Just curious, what rates are you running now?

Me? 550F, 650R.

Me? 550F, 650R.

Actually, meant Hampton... sorry.

The koni coilovers come with 350F and progressive rears. I think 280-400.

I've heard from a couple of sources that the Vogtland springs are produced by H&R as a 'house' brand.
Anyone know for sure ?

GC uses the 1159 sport koni in many of thier kits.

Eibach also makes many 'barrel' or shaped springs of custom length based on the rate or application needed. I use them all the time on lower rate setups. The 2.25 inch springs are made from a high tensile were to improve travel and reduce weight. They are probably as light as anything else on the market.

I've heard from a couple of sources that the Vogtland springs are produced by H&R as a 'house' brand.
Anyone know for sure ?
I don't believe that's true. So far as I can tell there are three major (European) spring manufacturers, Vogtland, Eibach, and H&R, none of which have any affiliation with the other.
Eibach's main claim to fame is that they make springs that have a variable wire diameter, which gives them one more way to fine tune their progressive rate springs. Eibach supplies springs for Sachs, BMW OEM, some Koni kits, and likely a few others (possibly Dinan?)
Vogtland's main claim to fame is their VVS material, advertised to be simultaneously stronger and lighter. They supply springs for TC Kline, some Koni kits (including their coilovers I believe), and probably some others as well.
H&R seems to be the most straightforward of the bunch with no particular technological claims, but a huge market share. I'm not sure if they supply springs to 3rd parties, but it seems likely.
As far as choices go, if you are talking a linear rate spring, the Vogtland's are probably the way to go. With a linear rate, the Eibach's variable wire diameter doesn't come in to play and if the Vogtlands can provide the same rate with less unsprung weight than Eibach or H&R, so much the better. The big however is that the performance difference is almost certainly very slight. If you are in a situation where very slight differences are very important, then it's probably worth it. But if you aren't, it's worth thinking twice about how much additional money you want to pay for how big a difference.

I've heard from a couple of sources that the Vogtland springs are produced by H&R as a 'house' brand.
Anyone know for sure ?

I have always been of the impression they make their own. :dunno

http://cms.vogtland.com/ITmaxxDeluxe/bin/ITmaxxDeluxeServer.dll?Article?ID=248&Session=2-7PhahufA-1

Actually... You've ridden in my car before with Vogtland coilover suspension... :)

Here's another link:
http://www.purems.com/products/vogtlandtour.php

not lighter.

not lighter.

http://cms.vogtland.com
"VOGTLAND VR racing springs are manufactured at our facilities with our exclusive spring alloys. The special alloy permits our engineers to design the lightest possible springs to help reduce unsprung weight for improved handling and performance.

VOGTLAND VR racing springs provide more travel and are up to 35 % lighter than conventional chrome silicon (CrSi) alloy suspension springs. "

Interesting thread as I have Bilsteins with GC/Eibach ERS up front and TCKline VVS shorty #500 rears (long story how this came about). My car handles exceptionally well and certainly night and day better than stock. It would be difficult at best to say which spring seems better or which setup is better other than to say this -- if I had it all over to do again, I'd get Koni's SA or DA with TCKline VVS springs with their ride height adjusters. It's not that the GC setup is not good, it is for other setups other than Koni. It's just that I wish I had the adjustability functions that come with Koni and the high pressure rates of the Bilsteins make them less "compliant" if you will for my wife. Personally, I could care less how compliant they are if they handle well.

The GC springs are not the same as the Eibach ERS springs, even though Eibach makes the springs for GC. The GC springs have a slight barrel shape to them, which gives it a slightly shorter block height (about .25 inches less on a 440 lbs/in 6" spring).

I don't think so -- I don't have pictures from last weekends install but there was no mistaking the Eibach ERS markings on the springs. Further, the springs they replaced had to be at least 3" longer. If I have to take pictures I can but realistically the stock springs had to be decompressed to remove, the GC springs had to be held in place as the car was lowered to make sure they seated into position properly. In other words, they were worlds apart from Eibach Prolines or anything else. FYI -- my signature is pre-suspension change.