stillracing Posted March 28, 2012 Share Posted March 28, 2012 Evening boys. So I'm considering lowering springs for my 350. However, being a motorsport engineer I have had my car on the 4 Post Rig at work (if you're unsure of what a 4PR is: http://farm5.static.flickr.com/4147/5014313747_7155f06cf7_o.jpg) The rig tells me that the OEM spring stiffnesses are: Front: 93N/mm (530lbs/in in old money) Rear : 117.5N/mm (671lbs/in in old money) Now, on Tein's UK website (http://www.tein.co.uk/installation_manual/nissan/Z33_02-.html) they list the S-Tech Lowering Springs (the ones I think people typically go for) as having stiffnesses of: Front: 386lbs/in Rear : 403lbs/in So you can see they are MUCH softer than standard. My question to those who have the springs is what does the car feel like after fitment? I think any driver worth his salt should feel a change - bearing in mind that the lowering will affect load transfer. Thanks in advance for any opinions. ps. In case there was any doubt, the standard 350z was superb on the 4PR. It scored better mechanical grip ratings than many DTM, GT and Touring Cars... Quote Link to comment Share on other sites More sharing options...
Greddy-Matt Posted March 28, 2012 Share Posted March 28, 2012 Hi I changed mine a week and a bit ago for the Tein S-Tech's they feel fantastic, the ride is not much harder (if at all now they've settled down) than the stock springs, and certainly not harsh, the ride still feels fairly stock it doesn't crash over bumps BUT it's lost a good deal of the roll when transfering weight in corners, feels like it corners flatter if that makes any sense, so far very, very pleased with them. Not sure where you are, but you're welcome to have a passenger ride in mine if your anywhere near Southampton. If you are after a set I picked mine up from Camskill for £140 inc postage Quote Link to comment Share on other sites More sharing options...
trackpig Posted March 29, 2012 Share Posted March 29, 2012 There is a list of spring rates here: http://my350z.com/forum/brakes-and-susp ... rates.html Would you care to share some figures from the 4PR rig comparing cars? Quote Link to comment Share on other sites More sharing options...
stillracing Posted March 31, 2012 Author Share Posted March 31, 2012 Great link thanks trackpig. It confirms that the widely available lowering springs are much softer than standard. In terms of car performance and handling - too soft. If I do go lower I think I'll be getting custom springs made... Quote Link to comment Share on other sites More sharing options...
theheff Posted March 31, 2012 Share Posted March 31, 2012 Where you based mate. Im sure someone with teins would bring you there car to have a look at.. If your Nywhere near london ill volunteer. Quote Link to comment Share on other sites More sharing options...
stillracing Posted March 31, 2012 Author Share Posted March 31, 2012 I'm near Norwich most of the time. Thanks for the offer though theheff - very generous Quote Link to comment Share on other sites More sharing options...
trackpig Posted April 1, 2012 Share Posted April 1, 2012 Why not look at coilovers if you want lower and stiffer? I run BC coilovers and find them to be great. Quote Link to comment Share on other sites More sharing options...
theheff Posted April 1, 2012 Share Posted April 1, 2012 I spend a fair bit of time in clacton aswell if thts any good to you. Quote Link to comment Share on other sites More sharing options...
Freebird Posted April 1, 2012 Share Posted April 1, 2012 I would also say proper coilovers are your best option, I considered lowering springs but then I wouldnt have the adjustment I wanted, i.e. ride height and dampener stiffness. Not entirely sure what the spring rates are on XYZ coilovers (what I have) but would be interested in trying some other ones on the shocks. Quote Link to comment Share on other sites More sharing options...
370Ad Posted April 29, 2012 Share Posted April 29, 2012 I imagine you tested the springs on the car? and the Tein figures are off the are... Quote Link to comment Share on other sites More sharing options...
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