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Old 07-12-2009, 05:39 PM   #1
PCSkiBum_21
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Default optimum tire pressure and camber settings for my car?

i have read through the tech articles and they talk a lot about tire pressure but not really what i'm looking for.

i just bought some 235/40-17 falken azenis for my wagon. just wondering what the best pressure is to set them at. different for dd and for track use? i'd love to hear feedback.

also curious about camber. right now my car is about -1.5 all the way around. i'm maxed in the rear until i get camber plates back there but i can adjust my front's more. i was thinking of setting them to -2.5. i've read a lot about this tire and i think this camber setting should be just fine on them. should i push it more or less? will it hurt anything to have one degree, or more, difference between front and rear?

i do dd my car, but have a track day about once or twice a month.

thanks in advance!
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Old 07-13-2009, 07:14 PM   #2
PCSkiBum_21
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bump.. have an appointment tomorrow morning for an alignment. i'm going to ask for as much negative camber in the rear it will allow and -2.5 front unless anyone can offer me some more advice.

thanks
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Old 07-13-2009, 09:01 PM   #3
rexworx
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What are you using the car for? How often do you track it? What other suspension mods do you have?

Id say run less negative camber in the rear. Dial it back around -1.3 to -1.5 degrees negative camber in the rear. Then run say -2.0 degrees up front. Put toe at zero at all four corners. Putting the rear camber a degree or so ballpark from the front will really help our cars oversteer and rotate more. You might have to run more negative camber in the rear so you dont rub. Depending on offset of rims, how wide of tires you run and if your rear fenders are rolled.

I autox etc a lot. I run -3.0 degrees up front, and -1.8 in the rear. Zero toe all around.

The car rotates quite nicely but thats also do to other mods.


Hope this helps a lil.

Ian,

Last edited by rexworx; 07-13-2009 at 09:07 PM.
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Old 07-13-2009, 09:25 PM   #4
PCSkiBum_21
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thanks for the reply.

like i said, i currently dd the car but do road race track days once or twice a month. currently i have -1.5 degrees of camber in the rear and the front but i'd like to push it further in the front to at least -2.5

i already fit the wheels tires with the current camber settings, i'm just looking for more performance out of the car. i currently have tein type re coilovers, corner balanced. front and rear cobb sway bars. front and rear cusco strut bars. rear fenders are rolled. 17x8 et44 with 235/40-17's.

i think i'll just tell them to set the rears as much negative as possible (since i don't have rear camber plates) and then adjust the front to another 1 degree more negative than that. i think the rears might already be maxed at -1.5 though. we'll see tomorrow what happens and i'll update.

thanks again.
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Old 07-13-2009, 09:33 PM   #5
rexworx
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Yeah Id say dont go more then -1.5 in the rear. going more will only make the car understeer more.
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Old 07-13-2009, 10:58 PM   #6
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Quote:
Originally Posted by rexworx View Post
Yeah Id say dont go more then -1.5 in the rear. going more will only make the car understeer more.
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Old 07-14-2009, 04:17 PM   #7
PCSkiBum_21
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^ more negative camber would make it oversteer more right? is that why you laughed?
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Old 07-14-2009, 09:39 PM   #8
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Quote:
Originally Posted by PCSkiBum_21 View Post
^ more negative camber would make it oversteer more right? is that why you laughed?
setting up a proper handling car is mor difficult than MOST think

and the common wisdom of using little to no negative rear camber is kiddie wisdom that thinks rear camber causes understeer


MANY of us run -2 in back and have no such issues

then, again, most of us dont snap spin and run backwards into the first thing to hit, either
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Old 07-14-2009, 10:15 PM   #9
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U will have to play with the alignment, what works for one person may not work for u. Different lines, and different driving style. Thank god i dont pay for alignments because im always playing with it.

For example I have
-1.5 front 34 psi
-2.5 back 32 psi

This keeps my rear end from breaking loose when im pushing it.

Last edited by misterau; 07-14-2009 at 10:21 PM.
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Old 07-14-2009, 10:36 PM   #10
ciper
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There was an excellent article in GRM a while back about tire pressures. They actually tracked the car at pressures from 50 down to 20. As far as I recall 28 psi gave the best grip but mushy feeling while 40+ psi gave the best response but lowest grip.

I played with mine for a while to get the balance between responce and traction and finally settled on 33 all around for performance and 45 all around for gas mileage (hot pressures)
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Old 07-14-2009, 10:40 PM   #11
PCSkiBum_21
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thanks guys lots of good info coming in finally haha.

side note: when i first bought my car i bought a lifetime alignment from firestone that turns out to be crap. they don't know how to adjust my camber plates/etc to get more than -1.5 up front. they guy told me it was maxed already but i should be able to get upwards of -4. anyway i'm on a new search for good local alignment shop that knows these cars/suspension.

back on track, i think i'm just going to try out -2.5 front -1.5 rear for now. there's a track day i'm going to on saturday so i'll be able to test it out. for tire pressure, how much about to they change from hot to cold? say i want to try 33 hot, what would i put that at cold? (no means of adjusting pressure once at the track for me right now haha)
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Old 07-14-2009, 11:25 PM   #12
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Quote:
article in GRM a while back about tire pressures. They actually tracked the car at pressures from 50 down to 20. As far as I recall 28 psi gave the best grip but mushy feeling while 40+ psi gave the best response but lowest grip.
'tracked' as in autox or TRACK???

and for what car, EXACTLY

this kind of thing can give many a false sense of whats right for the wrong useage
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