Wednesday, February 23, 2011 - 11:23 am, by: Sebastian Grant(Saabg)
Allan, the pedders ones are made by bc as they are one of only a few companies that are adr approved. The red ones are the old style, these are the upgraded version.
Wednesday, February 23, 2011 - 09:33 pm, by: John Stafford(Johng12)
Can someone explain how to understand spring rates. Vincent says that his are 8 kgs and 4 kgs but my Eibach springs are rated as follows: Eibach ERS springs(0800.250.0500, 1000.250.0250) The first number here refers to the height in inches, the next number is understood as 2.5" internal diameter of the spring and the third number refers to the pounds per inch rating of the spring itself. So my springs are rated at 500 lbs/inch for the front and 250lbs/inch for the rear. How does this related to 8 kgs and 4kgs? Thanks for help to understand the lingo. Maybe the U.S. speaks a different language when rating springs? Cheers John
Thursday, February 24, 2011 - 02:59 am, by: John Stafford(Johng12)
So the factor that we need to convert lbs/inch to Kgs/mm is 55.5. Thanks, that makes mine 9 kg front and 4.5 kg rear and I run these with heavy duty Bilsteins. My ride is a bit bumpy but not bad but fabulous when you need to push it on corners. According to Andrew Brilliant in the U.S. who has his Soarer handling better than his Supra. These spring rates coupled with the hard Bilsteins give just about the maximum possible "G" forces of traction on normal imperfect roads. He says that if you have it harder then it bounces on holes and bumps and money is no object to him when it comes to experimentation. Track is different and he has experimented with harder springs with the same shocks on track of course, you can go harder on the track because the surface is in top condition, not so on our roads. Cheers John
Thursday, February 24, 2011 - 10:59 am, by: Vincent Chan(Vincent191)
Thanks guys. Initially I suggested some of the other settings suggested in this forum but luckly the sale guy told me those are far too stiff for road use and are for racing and drifting.
Thursday, February 24, 2011 - 09:57 pm, by: Spencer Cameron(Switchio)
Vincent, do your self a favour and keep all the packaging. My coilovers came with the springs swapped front-to-rear, so when they went in with the 10kg at the front (mine are 18/10 HSD's) the front sat on the bump stops.
8/4 Would be a fairly average ride in a Nissan (which is the only brand Just Jap really cares about) but its very light for a Z30.
Maybe the Cusco guy thought you were looking for springs to suit an OEM style shock, as opposed to the adjustable ones you have which have much less stroke to play with (and there-for require higher rates to suit).
Thursday, February 24, 2011 - 10:19 pm, by: Sebastian Grant(Saabg)
Paul Drane wrote on Wednesday, February 23, 2011 - 10:13 pm:
I have seen some rated at 18kg front and 12kg rear
That's me Paul. HSD 18f 12r. Brilliant on a good bit of road but when you hit a large bump mid corner you're in some trouble if you're already on the limit. However they aren't as uncomfortable as you might think.
I think 8/4 would be a bit soft though. Tein recommend 12/8.
Thursday, February 24, 2011 - 11:17 pm, by: Paul Drane(Paulwd)
Spencer Cameron wrote on Thursday, February 24, 2011 - 09:57 pm:
8/4 Would be a fairly average ride in a Nissan (which is the only brand Just Jap really cares about) but its very light for a Z30.
I went through Just Jap for mine, cant fault them,friendly, rang me back with the info about the rates I wanted, and let me know when they would be delivered. No problems.
Friday, February 25, 2011 - 08:45 am, by: Spencer Cameron(Switchio)
Vincent Chan wrote on Friday, February 25, 2011 - 08:25 am:
Thanks guys, I was told I can adjust the dampers, will that help a little if I find the coils a bit soft?
Not really man. If you bolt them in and they're too soft the guys at Just Jap will probably be happy to swap them for a stiffer set. I'd just call and make sure first though.
Friday, February 25, 2011 - 07:25 pm, by: John Stafford(Johng12)
IMO most of those commenting on this post seem to overlook the shock absorbers themselves. These make a great difference to how different springs work. If the springs are too hard then you will have trouble on pot holes or humps or rough surfaces, so the answer is to have really good shocks, like my heavy duty Bilsteins, then you get firm road holding without loosing traction when you aren't on a billiard table. Highest 'G' forces possible. This is an art, not just a mix and match. Cheers John
Friday, February 25, 2011 - 07:49 pm, by: Sebastian Grant(Saabg)
If your springs are too hard it doesn't matter what shock you have. You have to match the spring rate for the type of road surface you want to excel in. No one shock/spring combination will excel every where.
Saturday, February 26, 2011 - 08:01 am, by: Scott Casey(V8soarer_1991)
lets hope that the shock valving is up to the task of controlling the bump on the very soft springs and not overheat and start leaking.
they maybe double than stock stiffness. but the coils are made very wide on a stock spring to increase the distance before crashing together and they are progressive stiffness for a reason.
the coilover spring is pretty stiff linear per mm rate and not progressive, more compact etc.
Previous
