Auto X
10-10-09, 12:06 PM
#1
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Auto X
ok so i am autocrossing my 89 gtu tomorrow and i want to know if it would be better to run on my 15 inch vert wheels or my 17 inch SSR wheels...
the 17 are 8.5 front with 215
and the rear are 9.0 with 255's
the 17 are 8.5 front with 215
and the rear are 9.0 with 255's
10-10-09, 12:32 PM
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What class are u going to be running in? If its the stock class use the vert wheels, if its the sts2 class you might want to try the bigger wheels. As long you don't have any problems with the front end pushing when you are trying to turn, due to having the wider tires in the back.
Last edited by George84; 10-10-09 at 12:51 PM.
10-10-09, 12:40 PM
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Thats sts2 you want then.
STS2 will follow the STS rule set, but the eligible cars will be restricted to two-seaters with engine displacements of 1.8 liters or less. This class will provide a home for a number of popular vehicles, including the Honda CRX and del Sol, Mazda RX7 (non-turbo, '79-'92) and Miata ('90-'97), Toyota MR2 ('85-'89), as well as other similar vehicles. STS category rules 14.1 to 14.10 apply. Further, as in STS, only original equipment viscous limited slip differentials are legal in STS-2.
STS2 will follow the STS rule set, but the eligible cars will be restricted to two-seaters with engine displacements of 1.8 liters or less. This class will provide a home for a number of popular vehicles, including the Honda CRX and del Sol, Mazda RX7 (non-turbo, '79-'92) and Miata ('90-'97), Toyota MR2 ('85-'89), as well as other similar vehicles. STS category rules 14.1 to 14.10 apply. Further, as in STS, only original equipment viscous limited slip differentials are legal in STS-2.
10-10-09, 12:46 PM
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This will brake down the classes for you.
http://cms.scca.com/documents/Solo_R...categories.pdf
http://cms.scca.com/documents/Solo_R...categories.pdf
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10-10-09, 01:02 PM
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I say bring both sets of tires & rims then switch them half day and see which really works better. The Miata's will blow your doors off, but it's still fun. I was put into CSP with my old N/A with tons of mods, I thought you had to have internal engine work to be STS? Anyway have fun.
10-10-09, 01:05 PM
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Also, if this is your first time, pump your tires up to ~40 psi, take any loose junk out of your car the night before, and LISTEN TO YOUR INSTRUCTORS! Unless your bloodlines contain Moss or Schumacher you will get killed at your first event.
10-10-09, 02:47 PM
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when i did auto x with my vert i had 205/55/16s all around the car and into the day it started to push the front end a little. It was also quite warm out so that could have contributed to it.
10-10-09, 02:52 PM
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No internal work allowed in either class.
Also, if this is your first time, pump your tires up to ~40 psi, take any loose junk out of your car the night before, and LISTEN TO YOUR INSTRUCTORS! Unless your bloodlines contain Moss or Schumacher you will get killed at your first event.
Also, if this is your first time, pump your tires up to ~40 psi, take any loose junk out of your car the night before, and LISTEN TO YOUR INSTRUCTORS! Unless your bloodlines contain Moss or Schumacher you will get killed at your first event.
10-10-09, 10:13 PM
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jfpimp is right on the air pressure
10-10-09, 11:28 PM
#19
his fronts are 215s his rears 255s, pump up rear psi to compensate for the front understeer. More psi=less grip
I would have it at 37psi front and
45psi rear, and set your rear spring medium and front medium stiff with front and rear sway bars on.
If the car decides to oversteer abit too much, lower the psi in the rear and set the rear springs a few clicks softer..
and probably -3camber front and 0 camber rear....
idk thats how I like my setup
I would have it at 37psi front and
45psi rear, and set your rear spring medium and front medium stiff with front and rear sway bars on.
If the car decides to oversteer abit too much, lower the psi in the rear and set the rear springs a few clicks softer..
and probably -3camber front and 0 camber rear....
idk thats how I like my setup
10-12-09, 09:40 AM
#22
Wich wheels did you decide to go with ?
I would of used the vert wheels, there excellent for autoxing or track days, nice and light.
I find a NA FC with 17s and a wide rear tire LOOKS awesome, but makes it VERY slow.
if your serious about your lapping or making the NA fun get some nice tires on the verts.
the Ventus RS2s in a 225 - 50 15 or even in a 205 50 15 all around and you will have LOTS of predictable grip
I would of used the vert wheels, there excellent for autoxing or track days, nice and light.
I find a NA FC with 17s and a wide rear tire LOOKS awesome, but makes it VERY slow.
if your serious about your lapping or making the NA fun get some nice tires on the verts.
the Ventus RS2s in a 225 - 50 15 or even in a 205 50 15 all around and you will have LOTS of predictable grip
10-12-09, 02:28 PM
#23
i wouln run the ssr. when i first started to autox my 88 z24 with the stock 215/50/14 i had major problms with sidewall flex on the fronts, it was running on the sidewall throu some cornners even with 50psi. i have ssr comp now 215/45/16 and i can beat the miatas in sts. all you need to do is get some better tires on your ssr, something with 200 treadwear or less, 225 all around, and you will be set
10-12-09, 03:37 PM
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Just run it. Autocross is not really that hard on the car and it's quick, cheap seat time. Don't worry about being competitive either. There will be plenty of people faster, and plenty of people slower, even at your first event.