Toyota GR Corolla Forum - Ownership Discussion banner

Autocross Classing

15K views 46 replies 17 participants last post by  bwel  
#1 ·
So looking forward to my first autocross here in a couple weekends, and I, being new to this, didnt realize my CE wing was going to potentially push me out of Street class and into Street Touring (Section 14.2). Have any of you with SCCA Solo classing autocrosses ran into this situation? Looking closely at the rulebook, basically all the mods Id like to do to my GRC will push me into Street Touring so thats probably going to be my goal for now. Looking for any feedback from autocross veterans here.
 
#2 ·
#3 ·
Street rules are pretty strict. Overview here:

That said, unless you're at the nationals, I doubt if anyone would protest you for running the Circuit spoiler, since the Circuit is essentially just an appearance package, and is in the same class as the Core.

Full rules here:
Thank you, yeah I dont know how strict people will be over the CE wing, kind of a bummer an intake pushes it into Street Touring, since I really just want to be able to hear the turbo a bit more, while a catback exhaust is allowed in Street and will probably be my next mod. Ive also got front and rear strut tower bars coming so I can do a write up for a company and those look to firmly push me into Street Touring as well.
 
#9 ·
I believe it should be quite competitive in DS with allowable mods. Tested the water with ours at a local in totally stock form other than correcting the terrible alignment it had. It needs tires, bolts and a rear bar at minimum to address the inherent push the car seems to have. Ideally a set of adjustable struts to offset the soft springs. (yeah, back to asking a damper to be a spring). I have also requested a classing clarification for limited prep street prepared as I am a Hoosier junkie.
 
#11 ·
I wouldn't count on the GRolla going to STH, I'd guess it would go to STU along with many / most of the other DS turbo cars (1st gen Civic Type R, Veloster N). It likely won't be super competitive there, tho. Definitely write a letter to get it classed :)

After owning a few 1st Gen Type Rs, but only having test driven a Core GRolla (my CE is still stuck at the port) I'd guess on low grip / wet surfaces the GRollas will be competitive or the car to have in DS, but higher speed courses I'd pick the Type R. The way the CTR pulls is pretty ridiculous...
 
#13 ·
On most courses I'd choose the CTR in DS. It's silly how well that car does things. The 1.6L 3cyl in the GRolla is likely not going to pull as hard - so anywhere that the CTR can utilize it's power it's likely going to be the top dog. Although Mark Scroggs has shown the Elantra N to be a contender on certain courses too, but that's alien-level driving!
 
#17 ·
just completed an autox event in DS. the type r in DS are fast!

setup:
245/40/18 RE71R
-2.5 front camber
0 toe front, slight toe in rear.

initially ran 36/36 hot in 50/50 track mode. too much understeer in the tight corners. dont think i was using the full contact patch in the front.

then ran 32f 35r hot. less understeer probably from increased front grip.

without changing the rear bar, i think you really need to compromise the rear grip to get the car to understeer less. need to experiment more. thinking of going really high rear (38) or really low (26) to remove rear grip.

also need to practice some trail braking and being smoother during braking. may not need to remove as much rear grip if trail braking can get it to rotate better.
 
#26 ·
There must have been someone who prepped one and competed and won by a large margin for them to have come to this conclusion?
Anyone on here having any luck being competitive in DS so far?
[/QUOTE
There was a fellow who won the Pro Solo in New Jersey and another that finished 4th in class at a Tour in California. The other national results that I am aware of is when we ran the car stone stock (last minute switch due to broken car) at the Lincoln double (Pro/Tour) and finished damn near last in S4/DS. We ran the Oklahoma Pro this weekend with 3-dot Toyota crash bolts (-2.8 max & not the 4 degrees+ someone at SCCA stated ) and the Custco rear bar. It was a completely different car and we were closer to the class in S4. Still needs at least single adjustable dampers to help compensate for the soft springs. Other impressions understanding that I have been in Miatas for 20 years and on Hoosier A7s for the last 10: You can't see anything forward of the wipers so slalom timing is tricky. Went the motor decides it is heat soaked it will pull power without warning, almost like lifting throttle. If you drive in shorts the driver's side door handle will give you friction burns. Running a Pro you need to have a flapper on the front as the squat when you launch in 30/70 leads to red lights. We ran it down to 20 miles left on the fuel gauge with no starve. All this being said the car goes back to being what I purchased it for. A fun street car. Did not intend to autocross it and certainly won't on a B-Street classing. Their decision is another damper on my enthusiasm for the SCCA side of the sport.
 
#28 ·
I think DS has really healthy competition that they don’t want the GRC to potentially disrupt this.

It may get re-classed to DS as more data becomes available.

Let this be a lesson to not buy a brand new platform and expect to be competitive right away.

It’s possible the GRC is competitive in the hands of an alien driver.
 
#31 ·
Ive seen a stock GRC with race tires and oem camber bolts that keep it in DS be extremely competitive. In the right hands this thing is a beast. out of the 3 events Ive been to in the last couple months, he comes out top 5 overall every time.

BS is not nearly as active as DS in my area either.