The Official 370Z Autocross Thread

[ChrisSlicks]

Originally Posted by IMWEZL

Hmm very tempting. I might look into this when I get back from deployment. I was trying to go a whole year in B Stock without any mods just to get a good feel for the car. In three events I went from 5th place (out of five) to 2nd at the most recent.

The car has much more of an advantage in B stock. I would have won the last SCCA event if I had race tires on, as it was I came 2nd on street tires against race tired cars.

By installing the camber arms you are automatically in BSP which is a very hotly contended class. In BSP people are going to have crazy sized wheels, suspension mods and more. The other catch is that even in a prepared class you aren't supposed to use an alignment setting beyond stock range, which is quoted as -1.41 degrees max.

[AutoX Z]

Originally Posted by ChrisSlicks

The car has much more of an advantage in B stock. I would have won the last SCCA event if I had race tires on, as it was I came 2nd on street tires against race tired cars.

By installing the camber arms you are automatically in BSP which is a very hotly contended class. In BSP people are going to have crazy sized wheels, suspension mods and more. The other catch is that even in a prepared class you aren't supposed to use an alignment setting beyond stock range, which is quoted as -1.41 degrees max.

Where does it say in the rules you have to use stock alignment settings? It says you can only adjust it using stock capabilities but you can make it whatever you want.

And yes the Z doesn't really stand a chance in bsp against the boost buggies.

[ChrisSlicks]

Originally Posted by AutoX Z

Where does it say in the rules you have to use stock alignment settings? It says you can only adjust it using stock capabilities but you can make it whatever you want.

And yes the Z doesn't really stand a chance in bsp against the boost buggies.

In stock you can make it whatever you want within the stock capabilities, but for prepared you are allowed to add camber devices. I read the following the rules but I think I misinterpreted. You are correct that in Prepared you can go outside of factory specifications using the methods spelled out in section 15.8.

From the 2009 Solo Rules section 15.1 F.
"F. On all forms of suspension, camber/caster adjustment within
factory specifications may be achieved by the use of shims or
eccentric bushings. The intent of this allowance is to permit cars
to be restored to within factory-allowed specification ranges, not
to provide an additional method beyond those permitted in Section
15.8 to obtain alignment settings beyond the factory specifications."

As for the boost buggies, I think we can beat them but it will take some work.

[AutoX Z]

Originally Posted by ChrisSlicks

In stock you can make it whatever you want within the stock capabilities, but for prepared you are allowed to add camber devices. I read the following the rules but I think I misinterpreted. You are correct that in Prepared you can go outside of factory specifications using the methods spelled out in section 15.8.

From the 2009 Solo Rules section 15.1 F.
"F. On all forms of suspension, camber/caster adjustment within
factory specifications may be achieved by the use of shims or
eccentric bushings. The intent of this allowance is to permit cars
to be restored to within factory-allowed specification ranges, not
to provide an additional method beyond those permitted in Section
15.8 to obtain alignment settings beyond the factory specifications."

As for the boost buggies, I think we can beat them but it will take some work.

Yea the way I read that rule it allows you to shim the suspension ONLY if you're trying to get it back to the stock range because something else you did got it out of whack, like over-lowering. It still allows the use of crash bolts, camber plates, adjustable arms, etc. to do whatever you want but you can't use shims for the same purpose as all those other allowed items.

[boardkat]

Originally Posted by AutoX Z

Yea the way I read that rule it allows you to shim the suspension ONLY if you're trying to get it back to the stock range because something else you did got it out of whack, like over-lowering. It still allows the use of crash bolts, camber plates, adjustable arms, etc. to do whatever you want but you can't use shims for the same purpose as all those other allowed items.

the way the rule is officially interpreted in stock classes depends on the car and what the FSM/TSB's say. i don't have the helm's for the 370Z yet, and i haven't been monitoring the TSB's, but if there is an allowance for shims to get camber/caster back within spec, then it would be legal. usually, it just says replace suspension parts, unfortunately. all moot if nissan had put eccentric bolts up front to dial in something b/w -1.5 and -2.0 for camber

[ChrisSlicks]

Originally Posted by boardkat

the way the rule is officially interpreted in stock classes depends on the car and what the FSM/TSB's say. i don't have the helm's for the 370Z yet, and i haven't been monitoring the TSB's, but if there is an allowance for shims to get camber/caster back within spec, then it would be legal. usually, it just says replace suspension parts, unfortunately. all moot if nissan had put eccentric bolts up front to dial in something b/w -1.5 and -2.0 for camber

The FSM states the the front camber is not adjustable, if it is out of spec then basically they want you to replace parts because something must be bent. There are no eccentric bolts in front, only in the rear.

This is basically the only reason that the 370Z is in B stock and not A stock.

[boardkat]

Originally Posted by ChrisSlicks

The FSM states the the front camber is not adjustable, if it is out of spec then basically they want you to replace parts because something must be bent. There are no eccentric bolts in front, only in the rear.

This is basically the only reason that the 370Z is in B stock and not A stock.

well, that and the VLSD of course
i know what a 350Z handles like under power on corner exit... an exercise in patience and precision, that's for sure!!