Ok, I read a while back that others where having this problem as well but not can't find the thread. Anyway I put the springs on Saturday and left it sit until this morning when I dropped it off for the alignment. Well I picked it up this afternoon and took it for a spin on my favorite stretch of Autobahn and a back road full of some of the greates twisties I've ever driven. It feels great and I felt more confident pushing it harder through the twisties. The thing is when I accelerate hard it vibrates and when I get up around 100+ mph the whole car shakes now. So for anyone who has had or has this same problem, is there a way to correct it. I stopped back by the shop that aligned it and he told me that the drop wasn't big enough to affect the drive shaft/CV joint angles. He said they've dropped cars lower than that without problems before. Anyway, he's going to put it back on the machine tomorrow to check it over, but if I can't fix this I'm going back stock.

 

I notice a little vibration when I really get on it but nothing crazy like you describe. I feel most of the vibration through the gas pedal and a little throught the steering wheel.

 

^^^100 mph? I don't think the dealer will be able to recreate that problem... LOL

 

Well not in the states they can't, those panty waste beeches, damn speed limits. But here in Germany where the average speed is around 100mph they will. When I got the reflash for Stage 2, I went out with the tech and he pushed the car to 110mph. The dealer here doesn't give me crap when I bring it in for warranty or repairs, they feel the warranty is there to repair the car as long as it is in effect. The thing that really sucks, is that the springs make the car look great and when it wasn't shakin it handled great as well. Anyway I'll see what happens tomorrow and if the guy that aligned it can't figure it out, I guess i'll pull em out sell em and put the money towards coilovers.

 

Dude thats amazing... I didn't even notice you were in germany... by autobahn i thought you meant your own little stretch of highway... not the ACTUAL autobahn. You could get your car all calibrated for 100mph travels... thats insane.

"well I have sunroof whistling at 105mph... can we fix that?" "Sure no problem, we'll have it up by lunch!"

 

it takes too long to get a 2.4SS to 100mph, which is why I don't do it! lol, j/k. I dunno man, my Sportlines ride fine and no crazy vibrations. And thats saying alot considering I live at the tail end of a crazy 2 mile dirt/rock/massive hole road. I swear this road is gonna rattle every last bolt out of my car someday.

 

Ya, I love being over here. I only wish our cars came with a 6 speed for those higher speeds.

Mine drives fine if I just drive it around town, but when I put my foot into it leaving an off ramp to get on the Autobahn it vibrates the entire car and then smooths out for a while and around 100mph it starts vibrating again. This sucks, I've had these springs for like two months now, I finally got to put them on and now this.

 

OK, took it back to the shop today. We put it up on a lift and loosened a few of the bolts holding the suspension together to see if something was binding. I'm not sure what, but something popped(scared the **** outa me) so we tightened everything back up, realigned it and I took it out for a drive. Little if any vibration now, I took it to 130mph on the autobahn and it rides smooth and handles great.

 

Good news!!

 

you drive everywhere 100mph....i like the gas in my tank too much to be getting 13mpg.

 

When you say a few of the bolts are you talking about the lower strut bolts and the nuts on the sway bar links?? I get slight vibes around 15-20 MPH but they never come back at speeds greater than that (tested to 120 MPH on local Ohio "autobahn"). May or may not be my problem.

Also, a wise man pointed out in the original Eibach vibe thread that the powertrain mounts in the SS/SC really only control motion well in one direction, fore/aft in the car. You can prove this to yourself by standing in front of the engine, try and rock it fore/aft in the car, not gonna move much. Now try moving it side to side, you can almost do it with one finger. With Sportlines at low speed you can now feel more of the powertrains side to side vibes as you get going.

One of these days I'm gonna try solid poly trans mounts to see what that does. I'll probably still have vibes but better throttle response.

Oh yeah, who cares about fuel economy. If you're worried about that go buy a Corolla and be happy.

Drive fast but be safe...I know folks in Germany in general have respect for speed and a more disciplined approach to driving than most of the folks running around the states.

 

Mine vibrates aswell on hard accelleration.

 

I'm not sure what all he loosened up, but whatever it was it seems to have worked, the car rides smoothe now. Your second thought is one I was also concerned with, but I already have poly tranny mounts and the TTR engine mount and it was still doing that. Anyway, the car feels solid all I need is the rear sway bar now then it's off to the Nurbergering for me.

No, not everywhere, I work only 2 miles from my house so I don't have the space to go that fast. I just do it when I have reason to get on this one 25 mile section of autobahn near my house that is 4 lanes wide in each direction and has no restrictions. I hear you about gas though, it's $3.55 gal here so I try not to waste to much.

Mine thank god have all but gone away. I feel the vibes from the poly mounts now more than from lowering it.