Question for those who autocross 350Z
#1
Question for those who autocross 350Z
Got front and rear adjustible camber arms for Christmas. My 2007 Z is not lowered. Any suggestions on how much negative camber and toe in to set for autocrossing? Thanks
#5
#7
I have ~2.7 front, 2.0 rear, and am very happy with how it drives. With 2.2 front it doesn't feel like enough, with 3.2 it feels like too much.
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#8
What it ultimately comes down in tires. A grippier tire will cause more body thus meaning you need more negative camber. Size tire is also something to consider as with roll stiffness. Hotchkiss bars will help with roll, but you still have stock springs/shocks. If you auto-x, the control arms (I believe) will put you in SSM
#9
I'm pretty sure the 2009 rules allow control arms in BSP. But without a very expensive build up (like Peter Umino's old car) you're not going to be competitive in BSP either.
As for the OP's original question: I'd start at 2.0 negative camber in the front and 1.5 in the back and go from there based on tire temps, tire wear, and handling attributes. Test'n'tune, test'n'tune until the budget is gone or the setup is right.
As for the OP's original question: I'd start at 2.0 negative camber in the front and 1.5 in the back and go from there based on tire temps, tire wear, and handling attributes. Test'n'tune, test'n'tune until the budget is gone or the setup is right.
#10
My car ended up with -1.6 front and -2.2 rear, 1/8" toe out front and 1/8" toe in rear. (after my RSR Ti2000 springs)
I "run what I brung" at the track, but my car spends most of its time in the garage, so I wouldn't call it a DD.
That being said the weekend fun drives / occasional road trips / lots of autoX results in close-to-even tire wear.
The rear could use just a little less -camber though.
That's just a tire wear perspective though. I think another 1/2 degree of neg camber up front might make her a little faster, but I have yet to test that theory. (Too cheap/ lazy for A-arms.)
I "run what I brung" at the track, but my car spends most of its time in the garage, so I wouldn't call it a DD.
That being said the weekend fun drives / occasional road trips / lots of autoX results in close-to-even tire wear.
The rear could use just a little less -camber though.
That's just a tire wear perspective though. I think another 1/2 degree of neg camber up front might make her a little faster, but I have yet to test that theory. (Too cheap/ lazy for A-arms.)
Last edited by Z1NONLY; 06-15-2009 at 07:07 PM.
#11
I'm pretty sure the 2009 rules allow control arms in BSP. But without a very expensive build up (like Peter Umino's old car) you're not going to be competitive in BSP either.
As for the OP's original question: I'd start at 2.0 negative camber in the front and 1.5 in the back and go from there based on tire temps, tire wear, and handling attributes. Test'n'tune, test'n'tune until the budget is gone or the setup is right.
As for the OP's original question: I'd start at 2.0 negative camber in the front and 1.5 in the back and go from there based on tire temps, tire wear, and handling attributes. Test'n'tune, test'n'tune until the budget is gone or the setup is right.
Camber arms are allowed, however, only uppers, and you can't go with the SPL arms (legally, locally the guys I'm running said they don't care, they'll beat me regardless, but I still asked) because of the bushing material rules. You can't go to a different ratio of bushing material to metal than factory, which means for good arms, cusco more or less.
Edit, and to follow up, I still have understeer with -2.7 degrees of camber front, I set my front shocks stiffer to keep roll down, and stiffened the rear a ton and it helped, but I still think (looking at tire wear and handling characteristics, had no pyrometer) I might move to 3.2 for the next event.
Car could use sway bars though.
Last edited by Peak350; 06-15-2009 at 07:24 PM.
#12
Thats good to know. I might do that for next season.
The z is excluded from the street tire class. The only z that is close to eligible is the vert. But the engine size is too large. Yet again, the z gets screwed.
http://scca.com/newsarticle.aspx?hub=3&news=3629
The z is excluded from the street tire class. The only z that is close to eligible is the vert. But the engine size is too large. Yet again, the z gets screwed.
http://scca.com/newsarticle.aspx?hub=3&news=3629
#13
You can run control arms in BSP, and I think there is a street tire class pending for the Z (was talking about it yesterday with a local S2000 guy who runs regionals/nationals) so that could be fun.
Camber arms are allowed, however, only uppers, and you can't go with the SPL arms (legally, locally the guys I'm running said they don't care, they'll beat me regardless, but I still asked) because of the bushing material rules. You can't go to a different ratio of bushing material to metal than factory, which means for good arms, cusco more or less.
Edit, and to follow up, I still have understeer with -2.7 degrees of camber front, I set my front shocks stiffer to keep roll down, and stiffened the rear a ton and it helped, but I still think (looking at tire wear and handling characteristics, had no pyrometer) I might move to 3.2 for the next event.
Car could use sway bars though.
Camber arms are allowed, however, only uppers, and you can't go with the SPL arms (legally, locally the guys I'm running said they don't care, they'll beat me regardless, but I still asked) because of the bushing material rules. You can't go to a different ratio of bushing material to metal than factory, which means for good arms, cusco more or less.
Edit, and to follow up, I still have understeer with -2.7 degrees of camber front, I set my front shocks stiffer to keep roll down, and stiffened the rear a ton and it helped, but I still think (looking at tire wear and handling characteristics, had no pyrometer) I might move to 3.2 for the next event.
Car could use sway bars though.
#14
#15
Thats good to know. I might do that for next season.
The z is excluded from the street tire class. The only z that is close to eligible is the vert. But the engine size is too large. Yet again, the z gets screwed.
http://scca.com/newsarticle.aspx?hub=3&news=3629
The z is excluded from the street tire class. The only z that is close to eligible is the vert. But the engine size is too large. Yet again, the z gets screwed.
http://scca.com/newsarticle.aspx?hub=3&news=3629
#16
- Engine displacements up to 2.8-liters
Unless you're saying they will change the rules to let it in at some point in future. But that seems unlikely given the cars already in the class.
#17
They should look into it. Local clubs have very popular street tire classes. A club I've been running with has a street mod street tire class that gets 1/3 of the days entries.
#18
Edit, and to follow up, I still have understeer with -2.7 degrees of camber front, I set my front shocks stiffer to keep roll down, and stiffened the rear a ton and it helped, but I still think (looking at tire wear and handling characteristics, had no pyrometer) I might move to 3.2 for the next event.
Car could use sway bars though.
Car could use sway bars though.
#19
My alignment was done at 3.2, I was thinking that was near 2.5 before I went in.
#20
Why not? The S2000 is classed far faster than the Miata,