rondofj

Update: bought 5kg HSD springs from Otomoto, dismantled rear ( a real pain of the job in the dark with no ratchet spanner for rear coilover bolts- really hard to access those f$&@ers), well finally put them in. The HSD coil inner dia is about 1.5mm larger than the Cusco coils so there is some left-right play against the top n bottom sleeves. Texted Jez and he said it should be ok- legend. Put it all in ( fronts are still Cusco 10.8-11kg springs) and went for a drive, feels somewhat softer and DOES grip better - less wheelspin in first and second and more traction but not by too much, but a reasonably good improvement I would say. Doesnt ride funny or bottom out as I had thought with damper n springs not matched right. The car sat like 7-10mm lower after I installed the new softer springs in with coilover height untouched and spring preload about the same hand tight. So I raised it up that much to get more travel for the struts and less -ve camber for the wheels- win win. So I have yet to change the fronts- to 7kgs. Thinking I might go 6kgs as 5kgs from 9kgs for the rear didnt screw up my damping..

I have a pair of Cusco springs from an R34 GTT if you like, I think they are 9kgs.

Put a large pig in the boot.. hahaah

Thanks man, you guys are brilliant, Otomoto is 5mins from my place and have the HSD springs in various rates which look about the right size as well, 200mm long, 65mm Inner dia etc; now the dilemma is whether to go 6/4 or 7/5 from 11/9 which is a huge drop - you all have different opinions - I would love 6/4 but dunno if the dampers would cope, 8/6 would be more matched but then its too hard so

Thanks guys, got verniers today n worked out my spring rates from web calculators at 10.7/9 or 11/9- way too hard. Even going down to 9/7 will still be hard I reckon.

Would love 6/4 though, how bad will this be on the damper- its a purely street car, no hard cornering etc, just need grip grip grip

Ok so got verniers today for extra accuracy. Spring wire dia is 12.5mm Spring outer dia is 89-90mm No of 'active' coils is 6 Spring rate from a couple of US sites is 9kg/mm and thats for the rear- f**king hard hehe Fronts are 10.7kg/mm at 13mm wire thickness, all else same. Should I run n get 9/7 springs as two sizes down are acceptable or should I go out of bounds n get 8/6 which is still hard??

Ok so got verniers today for extra accuracy. Spring wire dia is 12.5mm Spring outer dia is 89-90mm No of 'active' coils is 6 Spring rate from a couple of US sites is 9kg/mm and thats for the rear- f**king hard hehe

And where does everyone buy their springs? I only know Pedders n King Springs here in Sydney. Does the diameter have to be exact in mm to sit on the coilover, its pretty hard to measure it with the spring in-car

Thanks mate its not Zero2R, theres no damper adjustment, could be a Zero1, its baaaaad, 18/16 sounds plain horrible when Im told even 8/6 is bad! Oh boy here I was wanting to put softer 6/5 or 6/4 springs in.. Would my dampers get rooted with this low a rate?

Does that mean the 0.63 rear on my Precision 5558 is rubbish aswl? Or diff kettle of fish?

Probably thats what I will do, chuck in softer springs and since its a street car only now, if it goes alright, I will just leave it. I have yet to get verniers and come up with a more accurate measurement of the spring wire thickness though..

The helper springs are helping absorb the shocks, if they werent there, then these springs are impossible to compress by hand

Hey there these are rears, so even more horrible lol,- you can add a couple KGs on the front ones.. Ima be off to super cheap to get some verniers soon, and Im intending to just change the rears for grip, maybe a pair of rear BCs is what I need as a final reaort..

I measured with a tape measure in-car not venier calipers so bound for errors give n take 1-3mm

8 coils, 90mm OD, and 14mm wire dia gets me about 11kg/mm just going down a mm in wire thickness, sounds more realistic..

Online calcs came to around 15.2-15.6kg/mm from two sources- thats impossibly hard lol

Free length is about 205mm, will see if I can find anything online- I expect these springs to be bloody hard- maybe 8kg/mm? You did say I can go a couple kgs down for my shocks to cope with?

Hey guys, managed to get a few numbers up which I posted on Sydneykid's pinned thread on spring rates - hope to get a reply soon: Spring outer dia : about 90mm Spring coil dia: 15mm No. of coils: about 7.8? (the bottom of the last coil is sort of a 'split half diameter coil' - see pic) Please disregard the lower 'helper springs'. Thanks Ron

Oops sorry forgot the pic, here it is..

Hi SydneyKid or anyone else, could you please help calculate the (rear only) spring rates of my older model Cusco adjustable coilovers. They are really hard and I want to change springs. Spring outer dia : about 90mm Spring coil dia: 15mm No. of coils: about 7.8? (the bottom of the last coil is sort of a 'split half diameter coil' - see pic) Please disregard the lower 'helper springs'. Thanks Ron

Hi SydneyKid or anyone else, could you please help calculate the (rear only) spring rates of my older model Cusco adjustable coilovers. They are really hard and I want to change springs. Spring outer dia : about 90mm Spring coil dia: 15mm No. of coils: about 7.8? (the bottom of the last coil is sort of a 'split half diameter coil' - see pic) Please disregard the lower 'helper springs'. Thanks Ron

Yes I meant the peak output - its great for an SR

Even with cams and an ex manifold thats a very good result for a 3071 on SR20 on 98 at that boost 18psi, more of an 'RB25 result', no?

Thanks guys havent had a chance to pull it apart to measure spring sizes yet due to work constraints but will be putting it up soon..Those springs are really rock hard...