If you intend on using the KWs, you just need to decide whether you want to use the KW springs (in which case you'll need toe bolts) or ditch the KW springs and go with some 2.5" ID springs and the SPL mid links. Make sure to select springs with appropriate spring rates to work with the KW dampers if that's the route you choose. The second option is considerably more expensive.
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It seemed pretty self explanatory you can't use the aftermarket "toe arm" with the oem style divorced spring combination. In that optionzero recommendations is what you need with a divorced spring coilover if you want to change camber and toe. But to be clear, the "toe arm" subsequently changes camber and toe simultaneously (more toe than camber), certainly if you are still using the oem traction arm in the front. The odd thing i don't understand about the aftermarket kits, is why isn't there adjustable upper control arms. This would be extremely better for changing camber and using the lower arm to fine tune toe. Changing the lower control arm geometry effectively changes the wheel base and SR. |
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Last note- if you do decide to get new springs, i highly recommend http://performanceshock.com/index.php?main_page=index or http://pitstopusa.com/ The guys at PSI are extremely helpful. |
You are correct, 2.5 inches is actually 63.5 mm
SPL's own product listing says their mid links are made to accept 2.5 inch ID springs the easiest way to do it is simply to order the springs from SPL at the same time. Mike at SPL is a very knowledgeable and helpful guy, call him with any questions at the time of your order. He got my sorted when i realized my aragosta springs wouldn't fit. (Bulletproof actually didn't help me much . . . i even asked them specifically if the springs would fit the SPL arms) |
I am concerned about the upper strut mount area on my g37 sedan with the true coilovers. Should I be worried? I know my Maxima back in the day had true coilovers in the rear so I don't see why this car couldn't?
Also what benefit does an aftermarket traction arm have (the rod in the frontward bottom part of the rear hubs)? |
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NOTE - adjusting traction arm length is an even more complex adjustment that will effectively change the wheel base as well as weight jack the car if unevenly set. This change in geometry can change front wheel caster which can lead to an assortment of other steering change. The arguments you may see about "bumpsteer" is a lose one. The bumpsteer in the rear is independent to each wheel unlike bumpsteer on the steering wheels. So the overall impact of toe change with the oem arms will not suddenly change the steering load on the car. However the solid traction arms will change the amount of load transferred across the car and act more like a solid axle and increase bumpsteer, not reducing it. In most cases this isn't a good thing but will give you much faster and accurate steering feel, something the g37 can benefit from. The g37 actually has a better ability to handle strut tower load than the 370z as it has an upper rear deck and backseat surround to absorb deformation. But i'm not saying its a good idea in either case. For those who've actually changed to a true coilover setup can speak on wether it works better and the amount of wear. |
Some people who went with a true coil-over in the rear of the Z have not reported any problems that I know of. A couple have reinforced the upper mount area by finish welding the plate that was spot welded. most of these guys track.
To add on to what MaysEffect said. The stock rubber bushings have a lot of friction and deflection in them. By changing out to SPL parts. The suspension moves freer. There is no binding. |
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But of course, free floating bearings will have less static friction than rubber to rubber. :iagree: |
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Good information about the traction rod, so if you have toe rods on the car should you adjust toe and then adjust the adjustable traction rod? That way toe can be where it needs to be before you lock it into place with the traction rod?
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So traction arm first > camber arm > toe rod. OR remove the oem rods, match the length of the new rod to the old rod, then adjust the alignment accordingly using the same format as above. |
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