2013 GT, mostly sees normal driving but I enjoy going faster at the track. I’m in Texas and roads are a little rough. Currently car har just an eibach lowering spring, other than that suspension is stock. Problem currently is that I can’t even pull in the driveway without scraping and the car doesn’t 60 foot well at all even with a drag radial. I’m thinking about adjustable coil overs like bc racing for an affordable price on coilovers. My thoughts are, will the coilovers help or hurt the 60’ and also can coilovers be used with other products like bmr control arms to help launch? I’d like to have a decent ride quality on street but still not look like a 4x4. Any set ups that people have good success with? Thanks
I'm guessing you have 'Sportlines', which are too low for anything other than some appearance preference. They may or may not be too stiff for what you're looking to do, though they sort of need relatively high stiffness to keep you off the bump stops at least half of the time.
How much more ride height do you think it would take to clear your driveway entrance?
The rear of the S197 is not that well suited for using coilovers, as putting the springs around the shocks will eat into room that would be much better used for wide wheels and tires. That said, I think you can get adjustable-height lower perches that will work with coilover springs at the axle's existing lower spring seat locations. It is also possible to space the existing rear Eibachs up if you know what you'd be getting into (and have access to metal cutting and welding equipment).
If you're getting wheel hop, you need to look at rear control arms with firmer ends than OE rubber. Start with the LCAs (because they're much easier to install) and do the UCA only if some wheel hop remains. Beyond that, you're probably looking at engine and transmission mounts.
If it simply spins the rear tires too easily/too quickly, you need to look into LCA relocating brackets and adjust the LCA inclinations for more anti-squat. This will plant the rear tires more quickly. It may be possible to load street tires too quickly, so just throwing the most aggressive (lowest hole) setting at the problem may not be the hot tip here.
There is no need to replace the panhard bar brace unless the OE brace is damaged, or possibly if you're running serious R-compound road race tires or real road-course slicks. Since you're more interested in the straight line, you're never going to put much load into it so don't bother swapping that one.
Norm