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GRs in STU autocross
GRs in STU autocross
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Old 12-15-12, 10:07 PM   #11
DelJago
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Default Re: GRs in STU autocross

@GA Scooby

GRM did a review on the RS-3 and found that is likes a bit of a stretch to really perform well. The width on a 245 is right at 8.5", so if you go with a set of GD BBS you'll actually be pinching them a bit.

I was torn between the 17x10 +38 RPF1 and the 17x9 +45 Kosei. In the end I went with the Kosei because it was much cheaper and almost 1lb lighter.
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Old 12-15-12, 10:10 PM   #12
yman
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Default Re: GRs in STU autocross

so you took 2nd in STU but you basically cheated by running higher boost than what you're allowed? I wouldn't call that fair, even if 1st place is way faster. If you're not running for competitive time then just run ASP until you get a stock boost target tune. Is your invidia DP catted?
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Old 12-16-12, 03:01 AM   #13
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Quote:
Originally Posted by DelJago View Post
@GA Scooby

GRM did a review on the RS-3 and found that is likes a bit of a stretch to really perform well. The width on a 245 is right at 8.5", so if you go with a set of GD BBS you'll actually be pinching them a bit.

I was torn between the 17x10 +38 RPF1 and the 17x9 +45 Kosei. In the end I went with the Kosei because it was much cheaper and almost 1lb lighter.
That's interesting to know! Thanks for the info.
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Old 12-16-12, 06:33 AM   #14
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Default Re: GRs in STU autocross

@yman

There isn't a single STi in my region that isn't Stage II, hell some guys are running on e85 conversions. Nobody cares cause it's all about having fun and compared to the guys that go to nats we're slow.

STU is where we all run because we're not on race rubber. Get a Braille and lighten up.
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Old 12-16-12, 10:50 AM   #15
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Default Re: GRs in STU autocross

Quote:
Originally Posted by DelJago View Post
Sadness, no traction in this thread??
I was disappointed in the lack of interest, too.

Quote:
Originally Posted by GA Scooby View Post
I'm thinking of girodiscs (I plan to get on road courses more) and ferodo DS2500's with goodridge stainless lines, motul RBF600 brake fluid, and a grimmspeed master cylinder brace.
I wouldn't want to replace Girodisc centers anymore than necessary ($$$), so they might be a poor choice for track use. Also, master cylinder braces are not STU legal.
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Old 12-16-12, 11:03 AM   #16
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Default Re: GRs in STU autocross

As of 03/2014, mods are:

Suspension/steering
HVT internal DA coilovers (728f/896r)
Vorshlag camber plates
RCE tubular adjustable front sway bar
Whiteline steering rack bushings
Whiteline rear trailing arm bushings
Whiteline rear subframe inserts

Wheels/tires
Dry
18x9.5 TR Motorsports MT1
245/40-18 Dunlop ZII

Rain
18x8.5 OEM BBS
245/40-18 Continental DW

Brakes
Girodisc 2-piece rotors
Ferodo DS2500 pads

Drivetrain
Cobb short shifter
Cobb shifter bushings
Torque Solutions engine mounts
Kartboy pitch stop
Group N trans mount
Whiteline rear diff inserts

Power
Cobb Accessport w/ 100 octane STU tune (286whp/353wtq on Mustang dyno)
AEM panel air filter
Perrin crank pulley
Perrin EL header
Perrin "big tube" up-pipe
Cobb catted downpipe
custom v-band 3" 16ga stainless catback w/ Magnaflow race muffler

Weight reduction
Sparco Evo driver seat (mounted directly to Planted base)
Kirkey aluminum passenger seat (custom mounted to steel base)
Ballistic Evo 12-cell battery

Additional specs
-3.6* f, -2.0* r camber
0 toe square


The car weighs 3065# with the fuel light on.

Next up for weight loss:

a turndown to replace the axle-back section of the exhaust
AP Racing front calipers
lighten the driver seat mounting arrangement (at 33# now, 8# over minimum)
exotic wheels (CE28Ns or something comparably expensive; at 19# each now)

The TR Motorsport wheels are the easy button for GR/GV STU cars, since they do not require spacers. Although clearance is tight with AST 4100 front spring perches, they fit fine. Plus, they're relatively cheap and look decent.

Last edited by em99sport; 03-13-14 at 06:09 AM. Reason: update mods
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Old 12-16-12, 01:32 PM   #17
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I wouldn't want to replace Girodisc centers anymore than necessary ($$$), so they might be a poor choice for track use. Also, master cylinder braces are not STU legal.
The benefits of the girodisc's are they last longer under track conditions. I'm not going to be tracking the car every month. The rotor hats are the expensive part and you can buy the outer rings separate at a much cheaper rate.

I'm not competing nationally. If I were I would abide more closely to the rules. My local region doesn't really care.
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Old 12-16-12, 01:39 PM   #18
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Default Re: GRs in STU autocross

I'm glad to see someone running softer fronts, how do you like it?? The 2011 come with 10% softer fronts which I've come to enjoy. The car has some nice predictable lift-off oversteer coming into sweepers that helps with rotation.

I'm going to order some T2s and was planning on 550f/600r. There's not a lot of info on GR rates for AutoX. Most of the fast GD guys are running something like 600f/500r. But I don't like following them blindly, since a GR hatch is very different from a GD sedan.
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Old 12-16-12, 02:36 PM   #19
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Default Re: GRs in STU autocross

Quote:
Originally Posted by GA Scooby View Post
The benefits of the girodisc's are they last longer under track conditions. I'm not going to be tracking the car every month. The rotor hats are the expensive part and you can buy the outer rings separate at a much cheaper rate.
As mentioned above, I have them on my car. The advertised benefit is lighter weight, so I'm failing to see how they last longer under extreme braking (track use).

Despite writing "centers", I was thinking of/referring to replacing outer rings. While obviously cheaper than buying complete rotors, the outer rings are hardly the inexpensive part. MSRP for whole rotors: $1450; replacement outer rings: $800.

If my car were seeing occasional track use, I'd pick up some Centric Premiums and not feel *as* bad about eating rotors with track pads.
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Old 12-16-12, 02:49 PM   #20
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Default Re: GRs in STU autocross

Quote:
Originally Posted by DelJago View Post
I'm glad to see someone running softer fronts, how do you like it?? The 2011 come with 10% softer fronts which I've come to enjoy. The car has some nice predictable lift-off oversteer coming into sweepers that helps with rotation.

I'm going to order some T2s and was planning on 550f/600r. There's not a lot of info on GR rates for AutoX. Most of the fast GD guys are running something like 600f/500r. But I don't like following them blindly, since a GR hatch is very different from a GD sedan.
I love my coilovers. As I said above, I want more spring rate, but for a first try it's pretty damn good.

My plan has always been to rely on spring and not bar, so I'll end up increasing rates until I'm truly happy. My car is getting close to becoming a trailer queen anyway, so I won't have to compromise anymore. As a guess for the future, I'll try something like 600-650f/700-750r. At that time, I may or may not change dampers to a double adjustable.

If your car is a DD, and will stay that way, 550/600 is probably the absolute highest you'd want to go (provided your seat is comfy). At 500/560, the awesome AST dampers are the only thing saving my back, and NC has pretty decent road quality. With a fixed-back seat, spring rate selection requires a whole new level of consideration.
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