11-04-2011, 04:53 AM | #23 |
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+1, however with values on both axis, all the curves can be approximated and or scalled for comparisson.
Last edited by eeghie; 11-04-2011 at 05:00 AM.. |
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11-04-2011, 06:21 PM | #24 | |
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These guys are very local to me. Nice to see someone that puts in the effort to understand the issues- I probably need to go check them out.
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11-05-2011, 05:10 AM | #25 |
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WOW please take detailed pics throughout the process!!! Awesome work, awesome car.... with the right tweaks these cars will be giant killers.
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11-14-2011, 01:33 PM | #26 |
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Just got some JRZ RS dampers!
Just picked up some very slightly used JRZ RS dampers from a fellow with a E92 M3!
Anyone have a good idea about how low a spring rate I can run with these? Since the 1M is lighter than the M3 and my car is dual use (daily driver and track), I'm thinking about about something low -- like 350#/600#. Will this work or would the JRZs be happier with something stiffer? Neil |
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11-14-2011, 01:51 PM | #28 | |
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Did you get shock dynos with them? If not, any idea when they were last charged and rebuilt? JRZs, probably including the RS, are race dampers with very low friction seals for low hysteresis. Due to this they will typically leak and need rebuild on a semi-regular basis- I've done mine a couple times. First thing I'd do is find a shock dyno and see what you're working with- if they need rebuild that can be done at the same time. From there you can calculate what spring rate range they are designed to deal with. JRZs can be built up an various configurations and filled with various viscosity oils- knowing where they came from originally could also give you an idea of how they were set up.
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11-14-2011, 01:53 PM | #29 | |
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So.... I'm now thinking about going with some 392#/672# Swift springs. Neil |
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11-14-2011, 02:00 PM | #30 |
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any more pics OP??
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11-14-2011, 02:21 PM | #31 |
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keep me posted on what you end up with. are you going with a diff. camber plate? (thought you had one custom made for stock springs)
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11-14-2011, 07:57 PM | #33 | |
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I'm planning to get some Vorshlag plates for use with the JRZ RS dampers and Swift springs. I'll then probably look to sell the GC plates. Neil |
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11-14-2011, 09:35 PM | #34 | ||
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I am going to try and beat up terry some more to make Vorshlag plates for stock suspension, but in case he doesn't, put me down for first dibs on your GC plates. |
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11-14-2011, 09:42 PM | #35 |
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11-15-2011, 10:29 AM | #36 |
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I have a JRZ under my 1M it s really really awesome. Very very happy with it. The car is incredible with it. I will post up picture s and tell my experience with it later on. It the perfect compromise between road and track days.
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11-15-2011, 10:39 AM | #37 | |
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What spring rates are you running? Also what are the spring lengths? Thanks. Neil |
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11-15-2011, 11:22 AM | #38 |
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It s not the springs. Springs are from Eibach made to fit you can also use these springs on you're original dampers. You can order directly from eibach if you wish.
But it s not the springs which made the difference. It s the damper. If the springs are to hard you loose to much comfort. This setup has better comfort then original dampers and can be adjusted to suit the track. You can use original bmw top mounts so you don't have rattle problems. Racing dampers with adjustable rebound and bump settings are nice if you use you're car only for tracks. This JRZ setup can be adjusted with 22 settings. From soft to hard. I tested it on road and track. Gives perfect comfort to drive to track. Then adjusted to hard and drive you're socks off on track. Perfect. The JRZ wil be offered as a complete package for very good price. Last edited by Advevo; 11-15-2011 at 11:27 AM.. |
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11-15-2011, 01:15 PM | #39 | |
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In any event, I remain interested in the spring rates and length on your set-up. Neil |
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11-15-2011, 02:51 PM | #40 |
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You're right, they are switched, my bad. If I can, will try to correct original graphs
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11-17-2011, 10:50 AM | #41 | |
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It will be interesting to see what the aftermarket guys are dialing into their shocks if someone dynos those...
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11-17-2011, 03:34 PM | #42 | |
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How common is .65 - .75 critical (under critical !?) damping with sport suspension? Also interested in aftermarket values of Moton, KW and JRZ for comparison. |
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12-10-2011, 08:13 AM | #44 | ||
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A 392/672 is going to work well. A slight stiffer rear spring may help give you a better flat ride control on the street but only if you setup the shocks accordingly. The ideal spring lengths are 8" front and 9" in the rear. As general rule, this allow spring to work in droop travel which will be very important for ride qaulity/control on the street. I tried just about every combo of springs over the last 3 years and this is the best one and the calculation matches as well. Quote:
As a reference I designed an articulating spring perch that sits between the helper and main spring to combat the spring bending along a curved axis. At full droop the device is tilted about 9 degrees. Having the helper springs on the bottom on the camber link goes along way at reducing stiffness cause by spring bending along a curved axis. The helper spring will translate up 5-7 mm during use. Last edited by Orb; 02-14-2012 at 01:30 PM.. |
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