Moonface Roll Center Adjusters
#61
New Member
iTrader: (51)
The moonface roll center adjusters do move the pivot point where the lower control arm connects to the hub. If you shorten the distance between the lower control arm and the hub which the shorter adjuster do then you will need to legnthen your damper to keep the same ride height. By legnthening the damper you are changing the angle between the outside hub pivot point and the inside chasis pivot point. You are also changing the angle of the upper control arm since bothe arms are connected by the upright. The change in angle of the 2 control arms raises the instant center and therefore the roll center.
#62
Vendor - Former Vendor
iTrader: (10)
Join Date: Nov 2004
Location: Austin TX
Posts: 221
Likes: 0
Received 0 Likes
on
0 Posts
The moonface roll center adjusters do move the pivot point where the lower control arm connects to the hub. If you shorten the distance between the lower control arm and the hub which the shorter adjuster do then you will need to legnthen your damper to keep the same ride height.
The upper arm pivot points would remain fixed for the same reason above...
Last edited by kuah@splparts.com; 11-06-2008 at 12:11 PM.
#64
New Member
iTrader: (51)
Yes...
No, your upright is always in the same position relative to the ground, and if your ride height remains the same, your chassis remains in the same position relative to the ground. The pivot points are fixed on the inboard, relative to the chassis, and on the outboard, relative to the upright. So nothing is changed.
The upper arm pivot points would remain fixed for the same reason above...
No, your upright is always in the same position relative to the ground, and if your ride height remains the same, your chassis remains in the same position relative to the ground. The pivot points are fixed on the inboard, relative to the chassis, and on the outboard, relative to the upright. So nothing is changed.
The upper arm pivot points would remain fixed for the same reason above...
Last edited by JETPILOT; 11-06-2008 at 02:05 PM. Reason: Deleted incorrect information
#66
New Member
iTrader: (51)
I just got a call back from a firend who has a suspension program and the program confirms what you are saying Kuah. These will not change the roll center at all. After studying the suspensuion in the garage I see what your saying.
So am I right that these won't roll center? $500 for parts that don't work?
So am I right that these won't roll center? $500 for parts that don't work?
#67
Vendor - Former Vendor
iTrader: (10)
Join Date: Nov 2004
Location: Austin TX
Posts: 221
Likes: 0
Received 0 Likes
on
0 Posts
Well there's always something to be gained, I don't think any racer will stop looking for that last edge We did recently release the outer tie rod ends for bumpsteer adjustment, but otherwise progress is slow, I have ideas but not enough time/resources for development. Right now we are working on the v2 front upper arms, hopefully next year the economy will turn around and we can really get going with new products
#71
Former Sponsor
iTrader: (564)
Join Date: Feb 2003
Location: Long Island, New York
Posts: 19,266
Likes: 0
Received 5 Likes
on
5 Posts
I know I just had these installed on my own car ~2 weeks ago. My alignment had previously been done in May, just before Z days.
My before and after alignment specs.
May 2008 Specs
Front
Camber - Final (after alignment done May '08)
FL FR
-1.5 -1.6
Toe - Final (after May '08 alignment)
FL FR
.000 .001
These were my specs when the car was put on the rack October 2008
Front:
Camber - Initial (before RCA kit installed, before corner balancing done)
FL FR
-1.59 -1.64
Toe - Initial
FL FR
.004 .006
Camber - Final (after installing the RCA kit, camber and toe both had to be readjusted, this is where my car sits now)
FL FR
-1.29 -1.45
Toe - Final
FL FR
.003 .002
Cusco camber arms (set to max positive both sides, unmodded) , HKS RS coilovers. I think I posted front height from centerline to ground earlier in this thread so you can see what height I'm at.
Last edited by Z1 Performance; 11-11-2008 at 08:20 AM.
#73
Former Sponsor
iTrader: (564)
Join Date: Feb 2003
Location: Long Island, New York
Posts: 19,266
Likes: 0
Received 5 Likes
on
5 Posts
I wasn't in the car, someone else there was who's basically same weight as me. Keep in mind though that the Cusco arms have fixed adjustment points, its not like an open slot. So, it sorta ends up where it ends up - so not uncommon for there to be small differences side to side
#75
New Member
iTrader: (15)
Now we're talking. This is exactly the kind of discussion that people should push for before taking the jump.
I would comment but the discussion between Jet and Kuah is very thorough. Interested to see further developments.
I would comment but the discussion between Jet and Kuah is very thorough. Interested to see further developments.
Last edited by guitman32; 08-08-2018 at 07:07 AM.
#76
Registered User
iTrader: (54)
Ex. Every time I made a sharp 90 degree turn > 20 mph the tires would squeel and now it hooks likes its on rails. etc..
#77
Registered User
iTrader: (2)
Join Date: Jun 2007
Location: Scotland
Posts: 204
Likes: 0
Received 0 Likes
on
0 Posts
Could you elaborate on your findings just a bit more perhaps? It was "better" just doesn't cut it for me... Please explain what your car was doing wrong before the mod and how the mod helped.
Ex. Every time I made a sharp 90 degree turn > 20 mph the tires would squeel and now it hooks likes its on rails. etc..
Ex. Every time I made a sharp 90 degree turn > 20 mph the tires would squeel and now it hooks likes its on rails. etc..
Also i was experiencing understeer on rough ground where i was pretty netural on a smooth surface which has also disappeared.
The turn in response is much sharper at all speeds and the car overall seems very precise.
Ultimately i am very happy with these and would recommend them to anyone who's car was handling like mine.
Hope that helps.
Last edited by Colin_S; 11-12-2008 at 11:00 AM.
#80
Registered User
iTrader: (54)
So from what I gather Colin, the moonface upgrade was your last and most recent suspension mod, afterwhich you noticed an immediate change which was further improved after you got your alignment checked/corrected. Thank you.
Question: did the powergrid endlinks do anything for you? I am suspicious about those too.
Another waste of $$$ or useful mod? Curious about your (or anyone's) feedback on those too.
Question: did the powergrid endlinks do anything for you? I am suspicious about those too.
Another waste of $$$ or useful mod? Curious about your (or anyone's) feedback on those too.