I recently changed my shocks/struts and went with the G/Z spring setup. I like how the car handles now, but I had to drop the tires down to 32psi because at 35psi I could feel every line in the street and if I hit the slightest bump while cornering hard the front end would skip sideways. This morning I went to get the oil changed and they couldn't drive the car up on the rack (said it was too low), so I had to find a place that had a pit. For those of you who have been lowered for awhile is there any more surprises I should know about?

 

Did you have it aligned? After I dropped my sedan on revised Z springs, my alignment was way off and the car wasn't stable at the limit. Are your rear G springs 427 or 342 spring rate? I noticed that the ride seemed harsh with the 427 rate Z rear springs and dropped my pressure from 35 to 33. Even with the new D-specs adjusted to very soft it was still harsh over road seams and other impacts. I attribute that to the rear springs, and I may switch to 342 rate G springs at some point.

Coupe spring rates:
2003 - 2004 - G35 coupe with oem 17's or 18's spring rates - 314/342
2005 - 2006 - G35 coupe with oem 19's - 314/427

 

Yes I got it aligned the spec's were a little off, but I can live with them. The rear springs are 342 as long as I don't go over 32-33 psi all the way around I'm good.

 

I'm on 427 rears (sport coupe) and don't really notice the stepping out. It's a little stiff, but not uncomfortably so.

 

I'm on unrevised Z front and G Coupe rear springs on sport shocks. No complaints. I've actually noticed that my car sits a little lower on my OEM 17's then with my coupe 19's.

This is probably due to the 245/40 tires I'm running on all 4 corners.

 

The unfortunate a part of this, and something not always talked about, is that the more you've re-engineered the car, the more mechanical problems you'll have over time.

 

I'd like to nominate this for a Most Useless Post Award. Besides contributing absolutely nothing to the discussion, it's also completely wrong. Nobody has re-engineered anything, and the OP isn't having any mechanical problems. And it's not talked about because it's a total non-issue. The suspensions on the G35 Coupe, G35 Sedan, and 350Z are virtually identical. The biggest differences by far are the springs and shocks each uses. So swapping one set to a different car in no way qualifies as re-engineering. Hundreds of members have swapped out springs and shocks with no problems whatsoever. The only problems were not getting an alignment, which should be done after any suspension work, and unmet expectations about how these changes would affect driving characteristics.

 

^^^ It seems the OP may be having some difficulties already (albeit, not mechanical, yet)... if everything was easily swappable, as you suggest, there would be no issue whatsoever. The OP wouldn't feel every line on the street or be skipping sideways when he hits a bump (my car doesn't do this, it's stock except for the 235/55/17's), thereby requiring he lower his PSI. Read carefully the posts of the hundreds and hundreds who have lowered here and you frequently hear complaints of clunking sounds, difficulty aligning the wheels, having to change the camber on some, and a host of other issues.

What's the point of the suspension anyway--- it’s not to give you a smooth ride alone! It's role is to keep the tire glued to the road, thereby increasing and maintaining friction. Mess with this too much and the car begins to waver. When the size of the tire to road contact is only the size of our hand at any given time, any changes may reduce this contact point. I'm not sure lowering the car increases this contact point.

No need to need to be insulting... but do do your research before you post an opposing view, otherwise your post becomes the Most Useless Post Award!