Ride is bouncy after spring install...

[xbladr]

I recently installed some goldline springs on my stock 04 struts. The drop is pretty much exactly how I wanted it which is great. The only problem is the ride is unbearably bouncy. Is there anyways to fix the bounce from aftermarket springs? Does anyone else have this issue?

[BlackOhFour]

Stock shocks dont usually last long on lowered springs.

Did you cut your bump stops int he front? I cut mine to get a little more travel.

The ride was terrible on those springs with stock shocks so I went coilovers.

[SoCalHybrid]

^^^ Yep. Most people don't realize, but the shock and the spring are partners in controlling suspension. The spring (seriously) absorbs the shock [aka sharp motion, not the mechanical "shock" also known as a damper]. The shock [device] is used to dampen the spring. If the spring rate is too high relative to the shock/damper, then you get this decaying sinusoidal motion that slowly converges to the spring's natural height. On the same hand, if the damper/shock is valved to stiff for the spring, you will get a harsh ride that does not use the full travel of the spring.

When shocks go bad, they usually leak or blow out, in which case a substantial part of the device (pressurized gas or semi-vicous oil) leaks out, therefore substantially changing the valving. Essentially, the shock becomes weaker, and that's why the old-fashioned way to test is to bounce the corners of the car and see how many cycles it takes before the corner settles down.

I had eibach pro-kits with (what I think were) blown struts. The bouncing was horrible, and it bottomed out all the time because of the virtually nonexistent damping. On a different vehicle, a 2003 350z, I had completely stock suspension. I little known fact about the 350z is that Nissan messed up the valving of the shocks and had a quiet little mid-year fix in 2004. Ironically I found myself replacing the stock suspension with tokico d-spec adjustable racing shocks in order to get a smoother ride...Basically, Nissan under-damped the stock springs.

The SRT-4 is a little more difficult from what I've read. There are very few options, and the ACR package will not fit stock wheels/tires. Like the above person said, coilovers are pretty much the only way to deal with the srt-4 geometry. FWIW, I actually ended up selling my pro-kits, and went with a stock setup. (I've got herniated discs L5 & L6 so I can't handle a rough ride)

[my_little_srt]

This is why I opted for H&R springs. No bounce............

[kup@l]

I have eibach sportlines, gud look and stance. However, bad ride; I eventually got used to it of course. SO far 2 and a half years of survival. Getting bouncier every now and then. Hopefully I can find a good set of coils.

[AdvanSRT-4]

Pretty much all springs are going to ride like cunt. I have had 3 diffrent springs (Sportline, Pro Kit, and Progress) Finally said fugg it, and went with coil overs....Should have done that from the getgo.

[kup@l]

Quote: Originally Posted by AdvanSRT-4

Pretty much all springs are going to ride like cunt. I have had 3 diffrent springs (Sportline, Pro Kit, and Progress) Finally said fugg it, and went with coil overs....Should have done that from the getgo.

Lol DAMN, couldn;t get it straight huh hah

[xbladr]

alright sounds good to me i guess i will man up and deal with it. I figured since the spring rates on the goldlines are almost identical and I mean the fronts are the same as stock and rears about 10 harder they wouldnt be as bad. I guess I will deal with it till coilovers.

[JdM2UsDm]

Quote: Originally Posted by my_little_srt

This is why I opted for H&R springs. No bounce............

x2 on that i had h&r and no complaints what so ever none of that bouncy shit .. they sit like maybe a 1/2" higher than the goldlines but ride alot better i would know cause i had both springs... Ima throw h&r's on my IS300 also