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Old 06-07-2008, 11:02 AM   #1
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Default Alignment numbers for turbod miatas

Just wondering if any of you changed your alignment settings once you had more power in the car. I'm running 2.3/2.0 camber front to rear, 4 degrees of caster, zero toe up front and 1/16" in in the rear. My suspension setup is in my sig. With the 15x9 6ULs and the 225/45/15 RS2 I installed this week the car is go-kart sensetive now, follows every groove in the road and turns really quickly. It is very neutral in turns without but without any unpredictable oversteer, which I love. Still, I'm wondering if this will be too twitchy when I have ~250hp especially at 80mph+. So what specs are you guys using and how do you like it?

P.S. I'm glad there's finally a section for this stuff.
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Old 06-07-2008, 11:11 AM   #2
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You'll definitely get more throttle-input oversteer all things being equal, but it's hard to say how your particular setup will react to more power.

do it, drive it, change as needed.

I could stand a little bit extra negative camber in the rear for the extra power.

but remember, the tradeoff for lots of negative camber is decreased straight line traction (braking for for the front wheels and acceleration for the rear wheels) because of the distorted contact patch with the wheels not-normal to the ground.
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Old 06-07-2008, 11:15 AM   #3
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Mine's max caster, -1.8 camber front, -2 rear, zero toe front, 1/4" in rear. Works well enough.. but I have so little body roll that I think I can get away with dialing out some camber and save on tires/launch better.
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Old 06-07-2008, 11:21 AM   #4
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1/4 toe in in the rear seems huge, no? What's your suspension setup like?
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Old 06-07-2008, 11:47 AM   #5
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700F/325R
Bilstein HD w/ SM valving
RB enlinks
RB swaybar reinforcement
25mm solid front bar
15mm solid rear bar
FCM tophats
FCM 40mm bumpstops
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Old 06-08-2008, 12:08 AM   #6
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Stock suspension = stock alignment.
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Old 06-08-2008, 02:47 AM   #7
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here are new alignment im proposing for my car when its done. im still not sure about camber up front...

-2.4 to -2.8 degrees camber front
-2 degrees camber rear
max caster
1/16 toe out front
0 toe rear

that is track setup though... my specs are in that "specs thread" if interested
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Old 06-08-2008, 03:10 AM   #8
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Quote:
Originally Posted by UrbanSoot View Post
here are new alignment im proposing for my car when its done. im still not sure about camber up front...

-2.4 to -2.8 degrees camber front
-2 degrees camber rear
max caster
1/16 toe out front
0 toe rear

that is track setup though... my specs are in that "specs thread" if interested
Urban, that seems like a whole lot of camber. are you running soft springs? You may be sacrificing a lot of braking grip and even grip under power.
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Old 06-08-2008, 04:28 AM   #9
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nah, thats about right where i want it to be for what i do
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Old 06-08-2008, 05:04 AM   #10
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MY settings are all out of wack, however i just got my car corner weighed today and have a 50% cross weight at a ride height of 11.75F and 12.3R ill be trying emilio's "race" allignment next
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Old 06-08-2008, 09:48 AM   #11
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Quote:
Originally Posted by zzyx7 View Post
Urban, that seems like a whole lot of camber. are you running soft springs? You may be sacrificing a lot of braking grip and even grip under power.
Maybe he's running soft tires?
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Old 06-08-2008, 11:29 AM   #12
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Quote:
Originally Posted by UrbanSoot View Post
here are new alignment im proposing for my car when its done. im still not sure about camber up front...

-2.4 to -2.8 degrees camber front
-2 degrees camber rear
max caster
1/16 toe out front
0 toe rear

that is track setup though... my specs are in that "specs thread" if interested
that smells like oversteer. most miatas run about a half degree more camber in the rear... but maybe it's driving style.
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Old 06-08-2008, 12:32 PM   #13
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maybe it's drifto driving style...
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Old 06-08-2008, 04:15 PM   #14
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no, thats just for soft tires im planning to run on track. also, there shouldnt be any oversteer with my setup and this alignment as 1.5-way diff adds understeer to my perfectly neutral suspension and i have to balance it out a bit.
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Old 06-08-2008, 07:26 PM   #15
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Quote:
Originally Posted by UrbanSoot View Post
no, thats just for soft tires im planning to run on track. also, there shouldnt be any oversteer with my setup and this alignment as 1.5-way diff adds understeer to my perfectly neutral suspension and i have to balance it out a bit.
i forget... you turbo?

incidentally, lifting mid-corner with that diff and setup = loop-de-loop
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Old 06-08-2008, 07:34 PM   #16
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Emilio recommends the exact opposite, 2.7-2.8 front and 2.3 rear. He says it adds mid-corner grip without sacrificing much on the exit.
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Old 06-08-2008, 09:02 PM   #17
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Quote:
Originally Posted by kotomile View Post
Maybe he's running soft tires?
Quote:
Originally Posted by urbansoot View Post
thats Just For Soft Tires Im Planning To Run

Last edited by kotomile; 06-09-2008 at 03:43 PM.
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Old 06-09-2008, 01:44 PM   #18
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i am turbo. well... waiting on package from begi.
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Old 06-20-2008, 10:05 PM   #19
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this thread needs more specs. i need to re-do my alignment
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Old 06-21-2008, 02:00 AM   #20
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Car weighs 2046lbs.
300 rwhp
50/50 cross bias
375/250 spring rates
stock front bar, swap between stock rear bar and none.
torsen of course

auto-xing last week with -2.5 degrees in the rear i had no grip out of turns on my Nitto 225/45/15 NT-01s. Car was last aligned before turbo.

Just had it aligned Tuesday to the following specs.
FRONT
-1.5 camber
4.0 caster (manual rack)
-1/8 total toe

REAR
-1.0
1/16 total

Will find out this Sunday how it does.

Btw, during the morning session it was pouring and the car was ******* awesome. Of course I was a bit more conservative with the throttle. In the dry when I'd drop the hammer it just couldn't hold.
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