Autocross S550 Build

[Cranky]

After a year of racing my '20 GT 10A in autox, I want to get more competitive. I placed 6 out of 8 in my class and 104 of 133 overall. I bought it lowered, the only other aftermarket mod seems to be an oil separator and a staggered tire setup (tires are 20" Contis with 340 treadwear). I've since added Steeda 20mm wheel spacers for the front in anticipation for a square setup. The car is my daily in the summer.

My wish list includes:

1. Square wheel setup
-19x11 wheels, 305/R35 19 tires, 200 treadware. Open to used options.

2. Adjustable camber plates
-either Steeda, MM or Vorshlag. I want the easiest to be able to make adjustments to at the track.

3. Optional: Stiffer sway bars

An instructor said I could improve my time by 4 seconds if I had dedicated track tires and camber plates. What else would help?

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[NightmareMoon]

4 second may be optimistic for just tires, but they are indeed worth "seconds".

A 20mm won't help for a square 305 setup. 25mm is standard needed for a 305 square setup

I don't know any owners personally who actually change camber before and after events. Its not impossible, but you'll get out to more events if you minimize your effort required to get the car ready. 3 degrees of camber is still very streetable, believe it or not.

For your 305 200TW tires, they'll be 305/30R19 not /35. None of the good 305 tires come in a /35.

Driver is the most important mod.
1. Make sure you're taking advantages of ride alongs with faster drivers and getting experienced passenger into your passenger set for advice. TBH some regions just don't do a ton of this, so be proactive and ask for ride alongs and ask for passengers. Worst thing is someone says no thanks.

2. Then, consider Vivek Goel's online class Beyond Seat Time, which covers a bunch of more advanced topics in both driving and the mental game.

3. Consider investing in a Solostorm setup, esp if you have an android device. Its not as critical as 1 and 2,for novices, but its invaluable for intermediates.

4. HPDE events with an instructor are great cross training.

I'd be curious to know more about your springs/shocks before making recommendations on much else.

 

[xr4x4ti]

It looks like you are local to me. I may have some parts you are interested in. I have steeda camber plates, spacers and maybe even wheels. Reach out. I am in the Twin Cities area.

 

[Gearz]

When I was driving to events and changing tires at the site I'd slide the camber plates from "street" to "race" while the wheel is up in the air. It's pretty easy to just push the strut to the stop for max camber and tighten up the 3 bolts (I'm using the OEM camber plates that are optional on the GT350). The other benefit is that doing this on both sides moves the toe setting from about 1/8" toe-in to a little over 1/8" toe-out which is better for transitions in autox.

 

[John S]

When I was driving to events and changing tires at the site I'd slide the camber plates from "street" to "race" while the wheel is up in the air. It's pretty easy to just push the strut to the stop for max camber and tighten up the 3 bolts (I'm using the OEM camber plates that are optional on the GT350). The other benefit is that doing this on both sides moves the toe setting from about 1/8" toe-in to a little over 1/8" toe-out which is better for transitions in autox.

Does this same strategy apply to HPDE Track days? Is toe-out too unstable at high speed for inexperienced drivers?

 

[Gearz]

It's better for autox since it's so much transitions - in fact it's nearly all transitions. I'd keep a touch of toe-in for HPDE/road courses unless you really want killer turn-in but toe-out will give a little more understeer in the rest of the turn.

It's not really unstable at all. Toe-out in the rear will be a lot less stable and I leave it toed-in at the rear for autox and road course. More negative camber in front is way more important than the toe setting for road course. For inexperienced, I'd leave it alone and get comfortable with the track and the car first before changing anything - assuming the alignment is good to begin with.

 

[FitmentIndustries]

After a year of racing my '20 GT 10A in autox, I want to get more competitive. I placed 6 out of 8 in my class and 104 of 133 overall. I bought it lowered, the only other aftermarket mod seems to be an oil separator and a staggered tire setup (tires are 20" Contis with 340 treadwear). I've since added Steeda 20mm wheel spacers for the front in anticipation for a square setup. The car is my daily in the summer.

My wish list includes:

1. Square wheel setup
-19x11 wheels, 305/R35 19 tires, 200 treadware. Open to used options.

2. Adjustable camber plates
-either Steeda, MM or Vorshlag. I want the easiest to be able to make adjustments to at the track.

3. Optional: Stiffer sway bars

An instructor said I could improve my time by 4 seconds if I had dedicated track tires and camber plates. What else would help?

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