That's with Koni SA's. I was set on getting the H&Rs, but since there will be a GB on the Eibachs I'm kinda stuck now.
This is from that DTM faq:
H&R Sports- A stiffer spring than stock with a larger amount of drop than OE Sports.
Drop: 1.2” Front, 1.0” Rear
Spring Rate: 200 lb Front, 380 lb Rear *

Eibach
Pro-Kit- Stiffer than H&R Sports, but may ride softer than H&R Sports.
Drop: 1.0” Front, 0.8” Rear
Spring Rate: 148 lb Front, 428 lb Rear

So which combo out of these two would be better at the track?

both are ok for beginning track/auto-x use, but not ideal. they are still too soft up front.

That's with Koni SA's. I was set on getting the H&Rs, but since there will be a GB on the Eibachs I'm kinda stuck now.
This is from that DTM faq:


So which combo out of these two would be better at the track?


like BJO said, the difference between them is going to be negligible. They are both still very soft and not really intended for track use. They will work ok on track, but so will stock springs.

typical stock spring rates are like in the 190lbs/inch range, eibach/H&R type springs are in the 230lbs/inch range, while autocrosses looking for street/track springs run in the 400lbs/inch range, and guys with pure race setups are up in the 500-800lbs/inch range

Who makes a good street/track spring then?

Ground Control and TC Kline offer nice entry level coil-over set-ups. If you intend to track the car - that's a very good starting point. As you progress, you can always swap to stiffer springs and/or revalve the koni's for relatively cheap.

Who makes a good street/track spring then?

define good. all of the springs (H&R, eibach, vogtland, b&g, intrax,etc) that use the stock struts/shock spring perches are all designed for looks, ride, and performance in that order. they will work ok for most beginners, but as you get more involved in track/auto-x you will find that those parts are lacking. going to a coilover setup is the best way to go for perfomance, but it is not for everybody.

Isn't going coilover overboard for an E36 that is an occasional track vehicle? Don't you need to corner weight it to get it setup right with coilovers? I did only 3 trackdays last year, but I started late. I hope to do more this year. I just want something decent, I don't want to go all out. That's what my trackbike is for.

I used to think C/O's were overkill, too. They are not. Once you develop ANY prowess/pace at the track, regular aftermarket springs offer no real benefit over stock. The car will lean and dive pretty badly at track speed. I found myself maxing-out on sway bar settings in an effort to compensate for the lack of spring rate. This did not work very well, as i couldn't put any power down at exit.

A decent coil-over set-up allows you to run a proper spring rate (400+/500+)at a proper ride height, and ultimately play with rates/heights to suit your needs. Corner-weighting is not at all required, but is a nice option.

H&R Race springs have pretty decent rates, but are ultimately too low, and ride too low. The other springs out there are pretty much just "lowering springs" designed to give a sportier look/feel, and don't really transform the handling very much.

and is more than sufficient for 95% of the drivers. The difference in performance between a good strut combo and C/O combo is very minor, and only the best drivers can improve their lap times by going to a C/O combo. I've used the Eibach/Bilstein set up for years, and I am very rarely passed in HPDE's (10+ a year) with guys is with C/O set up, same goes for when I auto-x. I don't understand the comments that these are not recommended for track use?? A stock M3 with R comps, good pads can be plenty fast, and these bolt in springs just enhances the design of the car, and does not require a re-design of what the BMW engineers spent $$$ on developing, in which in essense some of these C/O's do. I am not knocking C/O's, just that it's not that complicated to enhance the handling on the M3, and the spring shock upgrade will make for a fast set up.