Bumpstops

I was wondering, what are bumpstops?? Why would yo uwant to cut them, and what is their purpose?? Ive heard numerous threads dealing with them, but i dont have a clue as to what they are!

Bumpstops are part of the suspension assembly. They are small rubber bushings which keeps the car from crashing hard on the suspension components when the suspension is at maximum compression.

When you lower a car, you reduce the compression stroke of the suspension travel. Since our cars do not have much suspension travel to begin with, this is bad. One way to get some of the travel back is by trimming the bumpstop. You do not want to trim too much though - maybe about half of it. Also, if you look, you will see a solid rubber part of the bumpstop and an accordion part. trim part of the solid rubber part - not the accordion part.

If you want to see some pictures, go here:

http://y42.photos.yahoo.com/alterzgo

look in the G20/AGX/GC folder. Pictures 1 and 2 shows the front stock suspension pieces next to the KYB AGX / GC coilovers. You can see the stock bumpstops as well as the aftermarket progressive rate bumpstops supplied by Ground Control.

Glen

I like those rims...what are they?

I think I posted this pic before. But I'll post it here again.

Here is a pic of my a stock bumpstop (right) and my modified bumpstop (left). I wanted to retain that dust boot so I just cut out the middle doughnut with a knife and then glued them back together with some Automotive Goop. I also drilled some holes in them and zip tied the two ends together.

I have the TEIN suspension for the P11 and it really helped with the ride quality. However my understeer problem was still not totally cured. I really need a front camber correction kit.

i think your NA height might be just set too low. well, I haven't taken mine to the track like you, but even with the soft rate springs I got on the NA's I use the second from the bottom height. haven't had any understeer problems yet taking some fast corners (doesn't seem like I'm riding the bumpstops). oh yah, the soft rate springs raise the height about 3mm compared to the mediums that you got. the ride is still pretty darn low though. :D

Originally posted by ky_infiniti2000
I like those rims...what are they?

My rims? Mine are Axis Racing Spec 17x7.5" rims. They are an exact copy of the BBS RSII wheel. Well, not exact - they look exactly like BBS RSII wheels, but are actually 1 piece wheels whereas the BBS rims are 3 piece.

Originally posted by kenchan
i think your NA height might be just set too low. well, I haven't taken mine to the track like you, but even with the soft rate springs I got on the NA's I use the second from the bottom height. haven't had any understeer problems yet taking some fast corners
I'm running second to the bottom setting too. You won't experience this terminal understear on the street. Unless you autocross or track race you'll never know. Right now I'm thinking a camber correction kit and rear roll bar would help a lot. Ultimatly a higher spring rate and linear spring would be the best. I'm going to wait and see how the B+G setup works for Dom (Dpro).

I C, yah, linear rate'll probably work better for you since you are at the track and autox with your G. :D how about those JIC's that luke got? any good for your application?:cool:

Considering my positive cash flow right now is 0 the application sucks! :):)

I'm going to put up with it for a while. When the TEIN shocks finally go I'll sell off the S-tech springs and get something else. The JIC's sound a little to hardcore for this casual racer.

gforces- hahaha! :D yah, you got them wheels, dat's why right? how do you like them? probably feeling some good acceleration differences off the line, huh? :D

i did notice a slight full bump when I hit a dip on the expressway going about 70mph. I'm thinking about firming up the NA's another 2 clicks. it's fun with these NA's how the tighter you go the better the ride gets. :D well, up to a point.

No wheels yet. :(

Originally posted by G-Forces
Right now I'm thinking a camber correction ...

What camber correction kit? I thought the P11 has the same basic set-up as the P10 up front. Right now I know of no camber correction kit for the car. I need one. I'm kind of motivated to come up with *something*.

actually, this company i am working with is coming out with adjustable rods for the P11 front suspension to adjust its cambers...i'll let you know when it comes out

Originally posted by P10DET
What camber correction kit? I thought the P11 has the same basic set-up as the P10 up front.
Yeah you're probably right. I was just thinking how nice it would be to have one. If one was available, I'd have one! :(

Originally posted by G22DET
actually, this company i am working with is coming out with adjustable rods for the P11 front suspension to adjust its cambers...i'll let you know when it comes out
Care to elaborate? Are you talking about the third link?

stillen is selling CAMBER KIT, EZ CAM 12MM for the P10. nothing for the P11 yet.

Are you sure about that? Can you get more details?

aww, luke's still haven't gotten your wheels yet? :(

haven't noticed much change from stock after lowering the frontend about 40-45mm....are you guys changing turn-in speeds?

there does seem to be too much play on the steering wheel after the car speeds up. is there a way to make it tighter? I guess it's great for most people, but for me, I like to have snappy steering.

Ken you might have too much toe out in the front. Did you get you car aligned after you lowered it?

Originally posted by G-Forces
No wheels yet. :(



On your website, dont you say you have advanti rims??
Just wondering.....maybe im confusing you with someone else

Originally posted by slickkedar
On your website, dont you say you have advanti rims??
Nope that is correct...but someday *AHEM*luke*AHEM* I'll have 17" RH CP-035's. :)

gforces- naw not yet. it tracks perfectly straight, so thought it would be okay...also, I kinda like my steering pretty snappy and it seems like it's helping (the toe out). but yah, I *should* get it aligned, you're right.:cool: everyone else aligned it after lowering the P11's?

Originally posted by kenchan
everyone else aligned it after lowering the P11's?

I get mine done(checked) with every service , because of the cost of tyres, i dont want to be chewing them out to quickly

oh, i better get it checked then...but the tires I got on the G is very cheap stuff. hehehe. :D only paid like $1100 total for the wheels with the tires..with locks. hahaha. :D they ride okay for a commuter.

need to find out some info!
i bought some KYB GR2's struts today.
planing to put them on diz weekend,
but first i need some help

what are those rubber things and washer for on the factory strut?
i noticed on my car one side has no rubber peices or washers
what are the names of these peices?
and do i really need them when i put on my new strut?

hey glen...seems you know your kyb's well, so i hope you can answer my question.

can you remove the spring perch? the stock ones are removeable and i was just wondering if the kyb's are removeable too because i already have gc's and i wanted my suspension to look like a full coil over system. thanks

Yes. You can cut off the spring perch on the AGX shocks and struts if you are using an adjustable coil over collar. But, remember to leave enough so that the GC coil over collar still sits securely on what's left of the stock spring perch.

theses are the peices Iam talking about..

It's been a while since I messed around with my suspension, but I believe the large thick rubber piece on the bottom right is part of the OEM bumpstop. You DO need these pieces when installing your suspension. If you are lowering your car, you would trim this piece in half horizontally.

The washer sitting next to it on the lower left is the stock top washer that goes on top of the strut with the nut bolting down on top of the washer. You DO need this piece too.

The other pieces on top (flat wide washer and 2 bushings) came with the GC coil over kit. You would use these things if you were installing GC coilovers. Otherwise, you wouldn't have them with the stock AGX.

go back to the page where you found that picture attached and look at the first picture in the folder. I think I labelled everything for someone else. You can compare the stock strut to the KYB AGX one with the GC coil over kit.

Glen

where can i get a bumpstop and the washers for my 94 G?

I usually get my G20 parts from Scottsdale Infiniti 800-955-9181. Ask for TJ and the 25% SE-R mailing list discount. I think they used to have free shipping too, but might require a minimum purchase.

Looking at my old invoice, I don't know which part is which, but here's what I bought (in addition to the 4 struts) and how much I paid:

56110-63J25 - Absorber Kit $89.92 list $67.44 discounted
55241-56E00 - Bumper-bound $21.80 list $16.35 discounted
54055-3J201 - Cover Dust $9.12 list $6.84 discounted

I bought 2 of each of the above. I'm not really sure which was for the front and which was for the rear. I didn't buy any washers or nuts as I used the existing ones.

Glen

Or, if you're lowering the car, you could also get the Koni bumpstops from Truechoice. They are far less harsh. I need to get them for my car.

what are the peices required for the front stut?
i have the new KYB strut, Intrax Springs, top plate.
do i need the bumperstop and the washer on the strut or can i take it off?