Mike 350Z

Ok first I ordered part #4027.140 (cuz that's what every site i looked at said was for the 3.0). Im wondering what all these #'s on the springs mean. On the front ones it has a "29/99" and "4011.102." I figure the 4011 thing is just an idividual part #, but whats the 29/99 thing? On the rear ones its got 4027.001 and 27393? I assume it's not really important, im just curious.

Also, I'm assuming the bigger, fatter ones are for the front, and that on the rears the flat pigtail end is the bottom, but what's top and bottom on the fat ones?

Thanks.

Mike 350Z

also whats the deal with trimming the bump stops? what are bump stops?

JLai

don't worry about that...you have prokits. They won't hit the bumpstops with daily driving.

wingman

I'm not positive, but I think they sent you the springs for the 4 cyl. If you look at the part number for the 2.2 or 2.3 the part number starts with 4011 (on the front springs... the heftier one). I remember when I received mine I checked the numbers an I recall seeing 4027. labeled on the front springs... but I also remember seeing 4011 on the rear springs.

"29/99" is some sort of a date stamp. Eibach sometimes revises the windings of their springs.

I hope I didn't confuse you. The best way to get a positive answer is to call Eibach (909) 256-8300.

Mike 350Z

OK it's all good now. I was wrong about which was front and which was rear. The guy at Eibach said the 4011 is used on both 4 and 6 cyl since the rears are pretty much the same. My 'real' front ones say 4027. I was just looking at overall diameter of the spring not the coil itself, plus i never tried to flex them. So now it's pretty obvious which is front and which rear.

So for the rears which side is top and which side is bottom?

JLai

I think my numbers ended up upside down.

I can check.

dennis

I'd cut the bump stops one notch. They look like a yellow cone. When you see if, you'll know what I'm talking about. It's the only rubber thing on the strut assembly. If you're going to get aftermarket shocks then I'd definitely cut them.

wingman

Yes, the rears read upside down.

JLai

Ummm...why? He has prokits. They won't hit the bump stops.

dennis

Maybe, maybe not. Most likely not, but there's not harm in cutting one notch down. I'd hate to see him bottom out because he didn't cut the bump stops and have to redo all the struts. Better safe than sorry.

JLai

You cut bump stops and your shits gonna get bouncy if you land hard. Don't cut them unless you need to.

dennis

You're a fucking retard

JLai

You're the fucken idiot telling him to cut bumpstops when they don't even hit. Let me ask you a question...how many people with prokits have cut their bump stops?

Why the fuck would he want more travel?

Shit...do you even have suspension? Your wheel gap is horrible.

JLai

And what the fuck are you talking about bottoming out and redoing the struts? People bottom out all the time...You don't have to redo the struts.

dustbuster4

I trimmed my bump stops 20 mm in the front and 15 mm in the rear (as suggested by Eibach; or was it KYB--I don't remember which, but one of them suggested it.)

dennis

I had pro-kits then I got Tein's that you very much. Like I said, You're a fucking retard.

dennis

Oh yeah, I've never bottomed out with pro-kits.

When I said "redo the struts" I meant taking strut apart from the springs and cut the bump stops after he already installed them because if he listened to your dumb ass he never cut them in the first place.

Jamz

Eibach does recommend trimming the bump stops in their instructions

VXCL

when i called eibach they said trim the fronts about a centimeter and leave the rears

JLai

Still looks like shit.

Mine work completely fine without shaving. I don't see any need if its not gonna bottom out. Its just gonna give you more travel.

And you're still a fucken idiot.

wingman

Same here. As suggested by Eibach, actually I think it was suggested for the 1996 V6 Accord, but I cut mine to that spec.

Cutting them will not make your ride bouncy. If you don't cut them and you do bottom out, your ride will be jolty or jerky (often confused with bouncy).

dennis

Seems like everyone here cut their bump stops. I'm threw with you

JLai

I think you are misunderstanding what i mean by bouncy. I mean if you LAND HARD...like I said the first time. Not that cutting your stops are gonna make you bouncy. You land hard you'll bounce up higher cause of more travel.

I took a 35mph downhill going 85-90 and landed fine. If I had cut my bump springs, I think I would have bounced up higher and god knows wtf would have happened.

Therefore, I don't see why you cut them if you're not hitting. It will keep you tucked.

Think about anti-lift kits. Do any of you watch rally racing? Look at what happens when the car lands a jump...they don't bounce up...they keep tucked.

JLai

To prove my point...My friend totalled his supra that night. He was following behind me. Tucked as fuck. Lots or wheel travel. He jumped a 3 ft high walkway and cracked the side wall of a bridge. We were going the same speeds down that road.

If he wasn't that tucked/bumpstops shaved...I don't think he would have flew 3 feet into the air. THAT is what I mean by "bouncy." Not talking about regular daily ride quality.

Oh yea...dennis...If you're so fucken smart:

Explain to me WHY you would cut them if you're not hitting the bumpstop on daily driving. That would clarify this whole thing up. Cause honestly, the only reasoning you've given me is "for insurance." Which to me is stupid.