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04-13-2014, 04:38 PM | #1 |
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What kind of ride? 600/900 springs
I currently have 425 front and 700 rear Hyperco springs with a JRZ RS-1 set up. Ride on the street is great, shocks set soft are as soft as stock, but a bit bouncy, 6 clicks front and rear is a bit firmer than stock but very acceptable and where I run on the street.
If I only drove on the street, this would be the ideal set up, and on the track if I only drove VIR I'd be fine and stick with this set up. Road Atlanta, which is probably my favorite track, has two turns where this set up bottoms out and not just a little bit. My options include some sort of custom bump stop or the proper route, I'm told is stiffer springs. Recommended set up is 600 Front, 900 Rear. 99% of my driving is freeway and this car is my daily driver. Track use is 3-6 times per year. Questions: 1) Will I hate my car with these springs? 2) How much stiffer percentage wise will this feel? it's an almost 50% increase in spring rates, will it feel 50% stiffer? 3) What would you do? Live with it as is and go with some sort of custom bump stop or switch to the stiff springs? |
04-13-2014, 07:02 PM | #2 |
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I'm running 600/800 lbf/in F/R on my JRZ RS1s and it's my primary street car. Rear suspension setup also uses BWs rear AL suspension arms with rod ends, and their F LCAB (thrust bearing). Personally, I find this a very comfortable setup on the street. I'm considering switching to MCS 2WNR dampers with higher spring rates and F suspension AL arms with rod ends, and I'm not at all concerned about the ride on the street.
So, at least for me, I'd have no trouble running 600/900 lbf/in F/R spring rates on an M3 used as a daily driver but, just like exhausts, everyone has their own tolerance level. It's not too difficult to swap springs so swap in the new rates, drive the car a few weeks, and then find out if you can tolerate the higher rates on the RS1s. Good luck! |
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04-13-2014, 11:39 PM | #3 |
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Running 690/900 here. Love it, street ride is better than stock with dampers set to 1 click above full soft. As long as your shock is set for it you should be fine.
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01-27-2015, 11:48 AM | #4 |
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Reviving an old thread as I prepare for things. My car would be track only, so I'm thinking 700/900 or 700/1000 for spring rates. It will be lighter too, think mildly stripped interior (all carpets, seats).
Still deciding on shocks, I want a single adjustable setup. I've been on revalved Ohlins R&T for high rates, and they are fantastic. Also had them on my GT3RS, and they are were awesome (they came with more track focused rates for that kit). Most people discount this setup because of low spring rates, but just have somebody like PSI revalve them for high rates and you have a great track setup, with long rebuild intervals. Nitrons are supposed to be great, but rebuild intervals are supposedly much shorter. JRZ and MCS are also options. Tough to decide. |
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01-27-2015, 12:08 PM | #5 | |
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800F/700R and the ride is not bad. I have the shocks set slightly above rain settings for the rear (-12 is rain setting from Nitron), basically this: Front Comp High -12 Comp low -12 Rebound Low -12 Rear Comp High -15 Comp Low -15 Rebound Low -12 I am still playing with the adjustability and every click can be felt. These things SHINE at the track and make the mountain twisties a breeze to drive on. Nitron recommends 2 years or something like 20k miles before a rebuild but if you look at some of the youtube video from Nitron USA, the shocks are made with quality parts and IMHO can be pushed further than the advised time frame. Nitron offers a one-way shock as well, which has all the tech of the R3 setup without the piggy backs. I might be mistaken but I think the R1 can also be upgraded to R3 down the line, with a few modifications. In all honesty, Motion Control, JRZ, Ohlins and Nitron are all a tough choice as they are all really really good shocks. I got Nitron because no one runs them and wanted to be different...also the Top Gear episode where they run a set in that weird looking car they try to compete with the Lotus, helped a bit. Last edited by italyix; 08-17-2015 at 03:16 PM.. |
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01-27-2015, 01:03 PM | #6 |
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Not sure what JRZ suspension is
coilovers or stock shocks? but 600/900 is soft as hell like mushy oem.. I have 14k/18k on fortune auto coilovers, and am upgrading to 32k for the rear of my E93 but that's a very slammed car so it's necessary..
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Last edited by GabeS; 01-27-2015 at 01:13 PM.. |
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01-27-2015, 01:52 PM | #7 | |
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I hope ur joking about the mushy feel...but I think valving on the shocks plays a huge part in feel. My 600/800 setup can be back breaking if on track setup or stiffer. |
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01-27-2015, 02:30 PM | #8 | |
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so I assumed it's an aftermarket coilover? Because if you are talking about aftermarket lowering springs, for oem suspension, then the rates I mentioned are gonna be different, I am talking about coilover springs. I currently run 14k/18k, but it's too soft and bottoms out all the time and has way too much squat, I have a set of swift 32k springs I ordered but they are only made in 6" so I have to have a custom extension on the mounting point. and yes, my coilovers are valved for much stiffer springs. A ton of my friends run spring rates upwards of 12k, and they consider their rides smooth and comfortable.
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01-27-2015, 02:44 PM | #9 | |
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Are you on linear or progressive? |
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01-27-2015, 03:15 PM | #10 | |
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01-27-2015, 04:30 PM | #11 | |
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Oh, I know I am sort of overdoing it, My car is pretty slammed, and the E93's differential sits low to the ground already, it bopttoms out hitting the pavement at hi speed fwy bumps, in CA, shitty fwy's I am a drift/stance guy, I guess, and to not damage fenders and not bottom out I need overly stiff springs(I am not recommending everyone go run 20k plus.. not if they don't need it at all. but being a fat hog that my E93 M3 is, Ineed to go much stiffer then the E92.
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01-30-2015, 07:44 AM | #12 | |
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01-30-2015, 11:17 PM | #13 |
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For those of you with JRZs and these spring rates, what settings do you use on the track? I was previously running RS1 and the springs were too soft (like 7k/14k) and I would bottom out over bumps and under hard compression. With 7k/14k I had to run at like 14 clicks on the street and 18 clicks on the track, which made it a bit uncomfortable at times.
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01-31-2015, 07:08 AM | #14 |
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Update on my situation, I no longer have the RS1 set up, I now have the RS (double adjustable strut/shock system). I don't know if JRZ has updated the RS1 but there has been an issue with the BMW application that for some people resulted in early strut failure.
The RS system has a much larger range of adjustment in about the same number of clicks. The RS1 even at the full stiff (20 clicks or so) never really became very stiff and in my application I couldn't tell the difference between 12 and 20. The RS system will go from about as soft as the RS1 but as you crank up the stiffness it quickly gets rock hard (too hard for the tracks I run). Regarding the spring rates, my understanding is that you don't just choose something that sounds good (I'm talking about dual purpose cars here like mine, street and track), but you want the best compromise between the two. If you are running on really smooth track and you have lots of grip, then you can run a higher spring rate. If you run R-comp or slicks you will probably need stiffer springs to support the available grip. I still run DOT street tires (AD-08R or RE-11) so I probably don't need as firm a spring set up as you guys. |
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01-31-2015, 01:11 PM | #15 |
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I am in the same situation. I experienced premature rs1 failure and have moved to the new jrz rs two, which I understand is based off of the rs. I am moving to nt01 tires this season so will need something stiffer, but don't want to ruin the car on the street. I am hoping a properly valved damper can compensate for stiffer springs.
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01-31-2015, 01:23 PM | #16 |
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I daily drive with 450/800 with MCS 1WNRs and it's on the soft side for the track. I'm going to 600/900 rates ASAP, and I have no concerns about these rates being too stiff for DD. That said, I had a great track weekend so I may run a few more events before making this move. I'm running at 16 clicks from full soft (only two clicks from full stiff).
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Last edited by dbyrd; 02-10-2015 at 11:15 AM.. |
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02-10-2015, 10:50 AM | #17 | |
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02-10-2015, 10:59 AM | #18 | |
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02-12-2015, 09:20 AM | #19 |
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FWIW I have 600/700 on my 128i with the RS1. Car rides great and is only 3100 lbs. A race tech recommended that setup to me and it rides very well on the street.
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02-25-2015, 12:46 PM | #20 | |
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Have you checked to see how much bump travel you have before the damper body contacts the damper body? RS1 bump stops can be trimmed a bit, 900 lb rear spring is high for a street car. The ride will be very firm. |
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