Tire Wear (More inside or outside?)
#21
A proper ax setup is along the lines of -2.9 fr, -2.5 (or more) rr, max caster, bit of toe-out in front and a bit of toe-in for the rear. Track setup has already been posted.
I'm far from an expert, but just a bit of research reveals that the above ax setup is used by nationally compettive ax'ers. It could be dependant on tires/sways/springs/driving style, etc. but there it is...
I used to use the above ax setup before the track addiction hit. Now I just keep the track setup and it's ok for ax (unless your serious). Ax setup for track, not so good..
ymmv
#24
The way I understand it is that in a corner, your car rolls and gains more camber. Due to your front roll couple, the front of your car gains less camber than the rear so you need more static camber up front.
It seems logical to most that more camber in the rear makes sense on a RWD car but try not to believe the hype and mis-information on m.net.
Here is a good place to read about alignment specs.
http://949racing.com/miata-race-alignment-info.aspx
#25
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I use the 949 alinement specs and honestly get a little more wear on the out side of the tire, I just depends on your driving style. Ive tried to get tire temps but it's rained at all the MC events I made it to this year and I blew up my car the first run last event so no such luck this year. I don't know why you would ever run more camber in the rear, Maybe drifting? The front always sees more load, thats why you run more in the front. Also Toe out makes a car twitchy, I run toe in for street cars and toe out for the track for best turn in. Sixace must be doing something right here Mad props on the 2010 Unlimited class champ.
#28
Two reasons why it is wrong.
1) The rear suspension geometry gains more negative camber than the front as the car rolls or sqats in acceleration.
2) Front tires job is only cornering and the rear is also needed strait line acceleration.
Also for comparison BMW E30’s have very near the handling balance of a miata. factory specs also have the front tires standing straight up and a fair amount of negative camber. Anybody who has really made an E30 fast has a **** ton of front negative camber and just a bit more than stock in the rear. Similar thing works for the Miata as well.
My own experimentation has led me to the same conclusion as Emillio’s 949 alignment the guy knows what he is talking about. Much more than about -2.5 in the rear saw diminishing returns but it just got faster as I maxed out front camber to about 2.8 which is all I could get.
Autocrossing I still wear the outside edges of the tires if your driving on the street and not cornering hard a lot Toe is what kills the inside edges way more than camber.
My suggestion is Max out front camber first. Back off only enough to get the same castor on both sides what ever max you can get both sides equal with camber as the priority. Put a little less camber in the rear.
To save tire wear set the toe to 0 degrees all around. Mark the flats on your front tie rods. It helps a little if prior to an autocross you adjust the tie rods out 2 hex flats per side on the front works good. Keep it marked and you can adjust your toe yourself for different events and set it back to zero for daily use to save tires.
Bob
#29
Thank you for that in depth description. I understand where I went wrong now.
MY only problem is at stock ride height, I'm maxed out with front negative camber. I won't be stock ride height for long and I know lowering the car adds negative camber so once I have my tokicos installed, I'll be looking to setup my alignment properly.
I'll also do that toe trick for my next autox! Thanks again
MY only problem is at stock ride height, I'm maxed out with front negative camber. I won't be stock ride height for long and I know lowering the car adds negative camber so once I have my tokicos installed, I'll be looking to setup my alignment properly.
I'll also do that toe trick for my next autox! Thanks again
#30
1. Tires
2. Tires
3. Tires
In retrospect, there is one thing more important. Benjamins.
#32
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The way to set alignment is with a tire pyrometer - plain and simple.
#35
Its the toe wearing the inside of the tire not the camber. Toe is a tire killer, common misconception is the camber doing it due to people lowering the car and not realigning the toe. Run crazy camber and no toe and profit. Fancy pants had 2.7 front and 3.0 rear, it was maxed out.
#38
We usually pick up about .5° without changing ride height.
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