I have a set of Group N shock (the softer one's) but no springs. I would like to fit them as temp fix for the time till I will finally go for coil over's Either looking for springs or selling the shocks. Springs need to be in the region of Grp N, not H&R race or the like. Looking for 800-900lbs rears, 600-700lbs fronts min. BTW this is for the OEM front strut, not the threaded Grp N's. Thanks
I have a set of H&R Grp G springs, same thing, for stock installation, 160f/220r IIRC. Not sure whether I am going to use or not. Mike
Kp/cm or N/mm or Kg/cm is basically all the same thing...for our purpose of describing a spring rate any small differences can be neglected. 110 N/mm --> 112 Kp/cm --> 112 Kg/cm The difference is how the force in Newton is converted to mass in Kg. Weight is not mass, its a force. If you use 9.80665 N/Kg, then you get 110 N/mm = 112 Kg/cm (more exact). However, you could also simply use a factor of 1 kg = 10 N, so that 110 N/mm --> 110 Kg/cm which is exact enough. to convert 110 N/mm into lbs/inch: 110 N/mm / (9.80665 N/kg) * 25.4 mm/inch * 2.2 lbs/kg = 627 lbs/inch or 110 N/mm * 5.698 (lbs/inch)/(N/mm) = 627 lbs/inch or 110 N/mm / 0.1755 (N/mm)/(lbs/inch) = 627 lbs/inch ...whichever conversion factor is easiest to remember. John
Thanks John very helpful. SO if I work this out correct, these springs are 911lbs front and 1250lbs rear? Holy cow.......
It only sounds like a lot. The dampers can produce forces in excess of 2000 N or 11000 lbs.... Its for the same reason that 22 mm front / 18 mm rear or 21 / 16 anti roll bar setups are really inadequate for such spring / damper setups and thats especially true when you run R-tires. 28 / 22 mm bars are more like it if you actually want them to work ! PS: dont get the idea that you should delete your anti roll bars, thats not what I want to imply. John
If you are still looking here is an S14.net thread selling Gruppe G springs, which I believe come in Gruppe N rates. You can check it out here: http://www.s14.net/forums/showthread.php?t=25374
yes thanks, I have seen them already. they are advertised as 500/650 but according to Johns formulas I work out 570/680 ?!? Currently I am running 350/560 which is nicely balanced with almost no understeer (at least before the cage went in....) and I don't want take any chances with a much different front to rear ratio. also 680 rear doesn't seem to be much of a chance to my current setup. I am tempted to try the 900fr and 1250 rear I am offered.....
Uwe, The stock style GrpN springs should still be available from the factory. I recently sold a complete GrpN kit. Well, I guess it was like 6 months ago but I bought it direct from the dealer. I can dig up the P/N's if you need them. I can also check on pricing. Course I'm in the US so the pricing I'd get is BMW NA. Lemme know if you need info. Cheers.
thanks for the info, but I don't want new ones. had Just a temp solution in mind. after last weeks ring driving I am not quite sure if I want to touch my current setup. I was spot-on, never touch a wiining team...
