Notices
993 Forum 1995-1998

Negative camber

Thread Tools
 
Search this Thread
 
Old 05-12-2011, 12:56 PM
  #16  
TheOtherEric
Rennlist Member
 
TheOtherEric's Avatar
 
Join Date: Nov 2002
Location: Chicago
Posts: 12,063
Received 35 Likes on 23 Posts
Default

Originally Posted by Falcondrivr
By adjustable sways, do you mean adjustable drop links like the Tarret engineering ones that adjust the pre-load on the bars? or is there another way to get adjustable sways?...
No. Adjustable drop links don't give any huge performance benefit, and many people don't even bother using them. (I have them in the rear, but I usually have run RS non-adjustable links). They simply remove any preloading of the sway bar in case one side varies to the other. I've never seen any preloading so haven't felt any need for them, but granted they'd be nice to have when needed.

By "adjustable sway bars" I'm referring to either TRG sway bars or RS sway bars that have 3 or 5 holes so that you can select a position for the link. So for track days, stiffen the bars up by moving to the inner holes, then soften the bars for city driving.

Originally Posted by Falcondrivr
...A buddy thinks I might do with the adjustable camber plates to dial in lots of negative camber for track days...
Yeah, good luck with that! Go buy a $300 Longacre camber/caster gauge and indeed you can dial in more camber in like 5 minutes. But oops, now you have to completely realign the car. So that's not really practical unless you don't mind re-aligning before & after every event. I guess you can experiment -- maybe the toe won't change too badly over your range of interest. But handling is very sensitive to toe, so you'd have to experiment on an alignment rack (or create a string setup like I've done) to figure it out.
Old 05-12-2011, 03:59 PM
  #17  
Falcondrivr
Race Car
Thread Starter
 
Falcondrivr's Avatar
 
Join Date: Apr 2007
Location: Tampa, FL
Posts: 3,929
Received 70 Likes on 36 Posts
Default

Thanks, That sounds like a good setup for me. I don't want to go any lower, and i'm pretty happy with the ride. I would just like to be able to find more grip at the track. Sebring is a pretty rough track... So maybe go with RS bushes and sways, a strut brace, and some R compounds?
Old 10-08-2011, 12:30 AM
  #18  
camlob
Pro
 
camlob's Avatar
 
Join Date: Apr 2008
Posts: 661
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by certz
I think I was getting close to 2 degrees at 10mm above RS ride height. I now have Rennline camber plates and monoballs and I am at RS height (maybe a touch below) with 2.5 front and 2 degrees rear. My comment for street driving with this kind of alignment is watch out in the rain. I use Dunlop Direzza's on the street but they feel like slicks in the rain.
I just searched "bump steer" and found this thread. I had my alignment done yest and took out the car today in the rain. My negative camber is 1.5 on all 4 corners. My rear alignment went out of alignment when I noticed so much black rubber dust on my last track day. It had too much toe-in.

Oh boy, the car felt like it had lost a rear control arm! I was totally freaked out in the rain. My tires are old tires since it came with the wheels. I am waiting for my Sumi's HTZIII to arrive.

It never felt this way in the dry. So the rain and my old tires are the possible reason for the way it handled today. To be safe I will have my alignment checked again today.
Old 10-08-2011, 02:01 PM
  #19  
mcipseric
Three Wheelin'
 
mcipseric's Avatar
 
Join Date: Nov 2009
Location: Orange County, CA
Posts: 1,693
Received 19 Likes on 11 Posts
Default

i can only get -1.5 in the front with KW v3s and rs sways. What can I do to to get -2.5 in the front? THANKS!
Old 10-08-2011, 02:57 PM
  #20  
Edward
Addicted Specialist
Rennlist Member
 
Edward's Avatar
 
Join Date: Jun 2001
Location: So.CA
Posts: 6,072
Received 297 Likes on 177 Posts
Default

I've gone the "dual-purpose" route ...lots of compromises on either end, to be sure; you've got to weigh which end of the spectrum has more importance for you.

FWIW, when I was tracking my 993, I ended up settling with around -1.2F/-1.7R camber and found this to be a superb compromise for TimeTrial and DD commuting. This camber (along with PSS9s and 22mm/21mm sways --OEM porsche not adjustable, ride height lower than Euro but a tad higher than RS, and R-comps) offered superb balance and total neutral handling on the track, good stick and great feel, sharp/crisp turn-in, and no ill bumpsteer bugaboos. And was completely comfy/stable commuting, even in rain. Weigh how much you're actually on the street vs track and choose accordingly. But going too far and making the car twichy on the street is not only not fun, but potentially less safe.

Edward
Old 10-08-2011, 05:37 PM
  #21  
mcipseric
Three Wheelin'
 
mcipseric's Avatar
 
Join Date: Nov 2009
Location: Orange County, CA
Posts: 1,693
Received 19 Likes on 11 Posts
Default

Originally Posted by Edward
FWIW, when I was tracking my 993, I ended up settling with around -1.2F/-1.7R camber and found this to be a superb compromise for TimeTrial and DD commuting.
Edward
From everything I have been told and read, the rear camber is supposed to be .5 less cambered that the front. i.e. if the front is -2.5, then the rear is supposed to to -2.0
Old 10-08-2011, 09:45 PM
  #22  
Edward
Addicted Specialist
Rennlist Member
 
Edward's Avatar
 
Join Date: Jun 2001
Location: So.CA
Posts: 6,072
Received 297 Likes on 177 Posts
Default

Originally Posted by mcipseric
From everything I have been told and read, the rear camber is supposed to be .5 less cambered that the front. i.e. if the front is -2.5, then the rear is supposed to to -2.0
Dunno what to tell ya: mine is dead neutral with very crisp turn in. It can easily be coaxed into oversteer or understeer depending on driver input. But remember the entire suspension functions together as a "system." So with my 21mm rear sway, this does much to balance out the handling. Though it was long ago, I definitely recall having the stock M030 20mm rear sway and getting the car to rotate took more work. The 21mm rear bar was the direct ticket. Together with the PSS9s and camber, the turn-in is sharp and direct while high-speed cornering stability is also rock solid (just noticed you're in OC ...my 993 was both very agile at the tight Streets of Willow, while rock solid at WSIR's fast t2, t8, and t9).

Edward
Old 06-20-2012, 11:56 AM
  #23  
targagr
Pro
 
targagr's Avatar
 
Join Date: Jan 2006
Location: montreal,canada
Posts: 573
Received 1 Like on 1 Post
Default

Resurecting this thread...

After reading this i think i have the opposite situation...after just doing an alignment my mech cannot get me LESS negative camber than around -2 all around? i have RS height +5mm 285/35 in rear and 235/40 front. I wanted -1.5 in front and -2 in rear. I have -2.3 inn rear. Said because of my height he cannot get me less negative camber?



Quick Reply: Negative camber



All times are GMT -3. The time now is 02:58 AM.