STX Rules and Setup Questions

[Areddi]

Next season all of the "big" changes are fully in effect, i.e. the Street vs. Stock thing become fully settled (right now there is a "Street R" or something like that as an interim step) and also I believe tire rating requirements change to 200 for ST classes. This would rule out the current iteration of the RS3, but they will likely make a 200 rating one.

I have been running ZII's now for 2 seasons and they are fantastic. They are 200 rating, as are the BFG Rivals and the Yokohama's, pretty much every manufacturer moved to 200 in anticipation of next year. Interesting to note, Dunlop has actually stopped producing the ZII, and is replacing it with the "ZII Star Spec" which follows the same production cycle they had for the ZI's a few years back. They have a large stock while we wait for the new tire to come out in October/November, price should be around the same I would expect but the tire is supposed to be 3% better or whatever.

The general consensus is that the RS3's, and likely their replacement, are the best tire in the hot. ZII's are considered better in the cold/wet/damp. Here in MD much of our season is cold/wet/damp, so I went for the all-arounder choice, and its not like they're not good in the hot as well, but a true min/maxer would likely have a set of current RS3's for the hot days. I plan to stick with the Dunlops and run a fresh set of the ZII Star Specs next year.

Side note: With those mods you already have you're pretty much committed to STX at this point unless you want to remove them. I personally run 245's all around on 17x8's, and that has felt perfect to me. Some people run a 255, but I dont think there is much benefit to that extra tire, most seem to say that the 245's or 235's are fine. You gotta figure this car even in full STX prep is still under or around 200 HP, so you're not dealing with all that much.

[BRZZZZZZZZZZ]

Originally Posted by Areddi

Next season all of the "big" changes are fully in effect, i.e. the Street vs. Stock thing become fully settled (right now there is a "Street R" or something like that as an interim step) and also I believe tire rating requirements change to 200 for ST classes. This would rule out the current iteration of the RS3, but they will likely make a 200 rating one.

I have been running ZII's now for 2 seasons and they are fantastic. They are 200 rating, as are the BFG Rivals and the Yokohama's, pretty much every manufacturer moved to 200 in anticipation of next year. Interesting to note, Dunlop has actually stopped producing the ZII, and is replacing it with the "ZII Star Spec" which follows the same production cycle they had for the ZI's a few years back. They have a large stock while we wait for the new tire to come out in October/November, price should be around the same I would expect but the tire is supposed to be 3% better or whatever.

The general consensus is that the RS3's, and likely their replacement, are the best tire in the hot. ZII's are considered better in the cold/wet/damp. Here in MD much of our season is cold/wet/damp, so I went for the all-arounder choice, and its not like they're not good in the hot as well, but a true min/maxer would likely have a set of current RS3's for the hot days. I plan to stick with the Dunlops and run a fresh set of the ZII Star Specs next year.

Side note: With those mods you already have you're pretty much committed to STX at this point unless you want to remove them. I personally run 245's all around on 17x8's, and that has felt perfect to me. Some people run a 255, but I dont think there is much benefit to that extra tire, most seem to say that the 245's or 235's are fine. You gotta figure this car even in full STX prep is still under or around 200 HP, so you're not dealing with all that much.

The "current" RS-3 is 200UTG and is branded as the RS-3 Z222, I haven't found the old 140UTG ones for sale anywhere, I believe all sets of those are pretty much sold.

[justint5387]

Originally Posted by Areddi

They are 200 rating, as are the BFG Rivals and the Yokohama's, pretty much every manufacturer moved to 200 in anticipation of next year.

The Yokohama's are 180TW.

[vroom4]

If I lived somewhere it rained and didnt get super hot Id run a 235/40/17 R1R on a 17x9 for the rest of this year.

[finch1750]

Originally Posted by Areddi

Next season all of the "big" changes are fully in effect, i.e. the Street vs. Stock thing become fully settled (right now there is a "Street R" or something like that as an interim step) and also I believe tire rating requirements change to 200 for ST classes. This would rule out the current iteration of the RS3, but they will likely make a 200 rating one.

I have been running ZII's now for 2 seasons and they are fantastic. They are 200 rating, as are the BFG Rivals and the Yokohama's, pretty much every manufacturer moved to 200 in anticipation of next year. Interesting to note, Dunlop has actually stopped producing the ZII, and is replacing it with the "ZII Star Spec" which follows the same production cycle they had for the ZI's a few years back. They have a large stock while we wait for the new tire to come out in October/November, price should be around the same I would expect but the tire is supposed to be 3% better or whatever.

The general consensus is that the RS3's, and likely their replacement, are the best tire in the hot. ZII's are considered better in the cold/wet/damp. Here in MD much of our season is cold/wet/damp, so I went for the all-arounder choice, and its not like they're not good in the hot as well, but a true min/maxer would likely have a set of current RS3's for the hot days. I plan to stick with the Dunlops and run a fresh set of the ZII Star Specs next year.

Side note: With those mods you already have you're pretty much committed to STX at this point unless you want to remove them. I personally run 245's all around on 17x8's, and that has felt perfect to me. Some people run a 255, but I dont think there is much benefit to that extra tire, most seem to say that the 245's or 235's are fine. You gotta figure this car even in full STX prep is still under or around 200 HP, so you're not dealing with all that much.

Any reason why you run a 17x8 over a 17x9? Just curious as I have been considering it since I basically only run local and it opens up so wheel options for me.

[Areddi]

Originally Posted by finch1750

Any reason why you run a 17x8 over a 17x9? Just curious as I have been considering it since I basically only run local and it opens up so wheel options for me.

The 245's fit perfectly on the x8 so I figured by go extra big if I don't need to, just extra weight. ZII's sidewall is plenty tough.

[justint5387]

245s fit on 7 inch too, you could save more weight.

[mrazny]

Originally Posted by justint5387

245s fit on 7 inch too, you could save more weight.

I can't believe Danny left all that weight on the Toilet Duck. What was he thinking!

[PoWn3d_0704]

I want the best grip I can get for STX class, and that really sounds like 9" rims on 245/255/265's, huh? I think 260's would rub on the gt86, but 255's dont, right?

[Scooby South]

Originally Posted by PoWn3d_0704

I want the best grip I can get for STX class, and that really sounds like 9" rims on 245/255/265's, huh? I think 260's would rub on the gt86, but 255's dont, right?

I am running 255's. on 9's.. I have 2 sets.. and to be competitive nationally.. you almost need a Concrete set and Asphalt set.. because there is no one tire.. that does both and be competitive. sure there is some that will do both.. but your going to give it up on whichever surface isn't the tires strong suit. and for those that think pinching down a 245 on 7.. yeah it will work.. but not well. you would be giving up precious sidewall to do that not allowing the tire to fully work. a 9 allows the tire to work as designed so the side flexes like its supposed to. just my 2peso's


Bill

[tahdizzle]

I'm on the fence about differntials.

You obviously have made your choice, but I would like your opinion about an ATB differential like the Quaife unit.

I have a Quaife in my SC tC, and I thought it was great. But I have had no other experience with differentials except for viscous (does the job... but bleh), and the quaife.

I've been curious about trying a 1.5 OS giken, or something similar. Any advice or opinion would be appreciated.

[finch1750]

Originally Posted by Scooby South

I am running 255's. on 9's.. I have 2 sets.. and to be competitive nationally.. you almost need a Concrete set and Asphalt set.. because there is no one tire.. that does both and be competitive. sure there is some that will do both.. but your going to give it up on whichever surface isn't the tires strong suit. and for those that think pinching down a 245 on 7.. yeah it will work.. but not well. you would be giving up precious sidewall to do that not allowing the tire to fully work. a 9 allows the tire to work as designed so the side flexes like its supposed to. just my 2peso's


Bill

Based on your wheels I probably know you're answer, but would you say a heavier set of 17x9 with a 255 (like Rota) is better than a light 17x8 with a 245 ( like an RPF1).

[Scooby South]

Originally Posted by finch1750

Based on your wheels I probably know you're answer, but would you say a heavier set of 17x9 with a 255 (like Rota) is better than a light 17x8 with a 245 ( like an RPF1).

Well my Rotas with tires right now is 45lbs vs. 43 lbs for RPF1's*9's with 245.. so not alot of difference. i lost about 18lbs or so. doing brakes.. so I upped the anny..

Rota Titans...17x9 *42 are 17.8lbs ea..

Bill

[jprice130]

I've been experimenting with an STX tune for my FR-S using RomRaider/ECUFlash/Tactrix and have noticed that data logs of my AutoX runs produces quite a bit of engine knock which of course pulls timing and reduces my IAM.

This is quite frustrating, because I've done numerous dyno pulls and straight road pulls in 2nd/3rd/4th gears and NEVER get knock in these conditions. The tune makes more power and torque, but it's annoying that all my work on the tune gets undone by knock events that pull timing during my AutoX runs.

Are all the abrupt braking, steering, and acceleration inputs of a typcial AutoX course causing false knock and this is just going to be a fact of life? Anyone else out there on an aftermarket tune get the same kind of knock events when you review datalogs of your runs?