So i swapped the rear BC Coil springs with Swifts.

A little background. I went with the Swifts to improve ride quality.
BC Coils are 230mm, sitting on the OEM rubber spring mounts. 8k.
Swifts are 200mm, but has slightly taller (new) aluminum spring mounts. 6k.

Assembled, and unladen, both are the same height with the perch the same way.

However, assembled, the Swifts are sitting so much lower. I had to compensate and increase the height through the perch, which is now maxed out (adjusters just below where the threads on the perch end.)

My goal was to keep the fender-to-ground height of 26.375". Now, most i can get is 25.75. It's literally a "no finger" gap. When my kids are in the back seat, it goes down about another 0.25".

I've driven it two days and so far haven't hit anything, but i've never had any car sit this low before. Would you folks think the same?

I value clearance and height, which is even more important at our local track since it's not perfectly smooth.

From a visual standpoint, it looks really low to me, but what do i know about that?

FWIW, i measured the jack points F/R and they're almost exactly equal now. I guess you could say my previous drop gave it more of a raked look.

Thoughts anyone?

Thanks.

 

25.75" is a bit lower than I would go with a DD but if you aren't scrapping anything that's good.
I'm sure it probably looks pretty good but unfortunately, since you didn't post a pic, I can't be too sure.
FWIW mine sit 26.5" on Eibacks and also drops when I fill the tank and throw my 3 teens in the back.

 

LOL! You got me there.

Yep, Eibach drop was my goal and has been my setting for a while, and was happy with it. When i ordered the Swifts, i failed to ask for a longer spring, thus the lower drop.

In any case, sorry about the lack of pictures yesterday, it's been raining a lot lately. But! The sun finally came out this morning.

Thoughts? This is without passengers and 3/4 tank of gas.

 

Even taking into account lower rear wheel wells, that looks like saggy bottom.

 

:\ Yeah...

Would you guys know how safe it is to adjust the rear perches so it extends further beyond the threads, like in this sample pic? (not mine)

I can probably coax another 0.375-0.5 out of it by doing so.

 

Mike, it's hard to tell how much threaded area is left engaged. It would come down to the strength calcs (engineering) for the number of threads in play. Of course the best solution is to get longer springs, but barring that, if you're only talking about 3/8 to 1/2", then I think I'd rather investigate a possible 'spacer' of sorts to stack onto the perch under the spring coil. Then again, you'd need to ensure there's sufficient retention so that the spring can't pop off the perch dynamically at full droop.

.02

 

It looks like there are just 6 to 7 threads remaining in the example pic. I would be worried about going that far let alone further. Contacting Swift would be the wise move in this case.

 

Mike, here's that thread I linked over on your post on myG37, may be of help. You look about the same height as mine in the back, fronts look a bit higher from your pic.
http://www.the370z.com/brakes-suspen...coilovers.html

 

Thanks for all the input so far, guys. Very much appreciated.

Sadly, with the BC's, the perch isn't as thick -- probably no more than 0.75 tall, i had two or three threads extend out and that's as far as i'm comfortable doing it. I guess some type of extender would work (here's my WTB post if anyone knows of someone with those.)

https://g35driver.com/forums/2nd-gen...-extender.html

It's BC, which i've contacted but being the weekend and all... Thankfully though, they're very responsive and helpful, i hope it continues until a solution is found like that above. (Free, hopefully, since i did mention the height issue with them, but they assured me that the new bucket adapter would compensate for the shorter spring.)

Thanks. I saw it, sadly the OEM rubber bucket adapter doesn't work for the Swifts. Here's a picture comparing the swift set-up and the original BC coils to give you an idea.

 

Wow, didn't realize how narrow the swifts were. Good luck with your dilemma, I'm sure you'll figure something out.