Finally out to autocross

claudermilk

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I finally got my car out dodging cones this weekend; I ran the autocross with the Speed Ventures guys at Auto Club Speedway--what a blast. Attendance was apparently pretty light from what they often see, so we got plenty of runs--this is a different setup than Solo II's 3 runs & you're done, then you take a turn chasing cones.

My first two sessions were in the wet, but this was probably a good thing as it kept the speed down and really forced me to focus on grip levels. This was my first time out with the car, with a RWD chassis, and first autocross in about 10 years. At least I did have the old memories of how an autocross works going for me.

So, of course the first thing I do is get a little lost, then spin as I tried to regain my bearings. After that the butt was mostly dialed back in and I started learning how the S197 chassis handles at the limits. I am still a bone-stock GT with Brembos & 3.73 gears, still on the OEM Pirellis.

I was already impressed with the handling of the ancient-tech suspension running on the street & a couple of canyon runs. Now that I could go 10/10ths, I am even more impressed and look forward to what this beast can do with improved suspension components & tires. The back end broke away smoothly, and I quickly got comfortable balancing the car with the throttle around most of the course. I still think I'm overdriving the really tight corners and am still trying to unlearn the FWD mindset on how to rotate the car in those. I'm probably leaving speed on the table in the faster sections as well. That said, on a course that the fast, gutted Fox Mustangs were running low 37's I got down to a 38 flat, so I was hanging within a second or two of them. Not too bad considering lack of experience in the car, and lack of preparation.
 

frank s

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Good experience and a beginning for a decent basis to evaluate modifications.

What were the highest speeds you reached, and what gear was most useful to you?
 

dennisafrompa

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Yes AX is fun...

.....the more you do it the better you get.
 

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claudermilk

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Good experience and a beginning for a decent basis to evaluate modifications.

What were the highest speeds you reached, and what gear was most useful to you?

Yep, exactly. I want to first get comfortable with the new platform, then start analyzing what it is doing that I don't like, or isn't doing that I want it to. Step one is further along than I anticipated it would be. I guess all those hours playing GT5 in RWD platforms wasn't a total waste; handling the power oversteer felt natural. Or maybe I've got more talent that I give myself credit for....nah, that can't be it.

I just stuck it in 2nd and left it there. About 50' from the start line was a really sharp right-hander, so starting is 1st was pointless. I'm also running 3.73 in the rear end (I now have read that is not optimal for autox, but it came on the car so it it's what I have for now). I would guess 50-60ish. It was a small course & nowhere to really let the beast loose for long. I never bounced off the limiter. Checking an online calculator, it looks like 2nd maxes out at about 62 for me.

Once I make it back down to a SD event again, I'd love to pick your brains. Unfortunately I am already committed to something the day of the December event, so I'm waiting for the 2013 schedule.

.....the more you do it the better you get.

Yep. Seat time is the best mod. I'm not coming from total scratch. I did pretty well back in the late '90's in GS in San Diego region. So, my main obstacles are scraping off the rust, and learning a new chassis.
 

19COBRA93

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In general I've found that 3.73's or 4.10's are actually more ideal for autocross as I can pretty much leave it in 2nd and use the whole RPM band without having to downshift.
 

DILYSI Dave

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In general I've found that 3.73's or 4.10's are actually more ideal for autocross as I can pretty much leave it in 2nd and use the whole RPM band without having to downshift.

All depends on the type of lots / events you run on, and the speed potential of the car. I'm planning on 3.55's, because that should get me 70mph @ 6500 RPM with the tires I'm running. 3.73 would do 66, and 4.10 would only do 60. Given the prep level, I should see over 60 often, and even 70 won't be unheard of.

Now - street car on street tires? I absolutely agree that there's no reason to need a 70mph rev limit.
 

Sam Strano

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In general I've found that 3.73's or 4.10's are actually more ideal for autocross as I can pretty much leave it in 2nd and use the whole RPM band without having to downshift.

I sure don't agree with that. When I ordered my 5.0, I got 3.31's. Even those were too short at times.
 

19COBRA93

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I sure don't agree with that. When I ordered my 5.0, I got 3.31's. Even those were too short at times.

I guess our courses are a lot shorter out here. I can't think of a time I've touched 3rd gear with 4.10's. I'm no pro, but I do autocross about 10 times a year for the last 10 years at least. There are times when I've certainly hit my 7k limiter in 2nd and maybe should have shifted, but I can definitely keep a cleaner run when I don't have to shift. And this is on street tires BTW. Probably a different story with R compounds (which is probably why we're having this conversation).

I've seen and heard of some courses that are a lot more opened up than what we run around here, but I haven't run them.
 

claudermilk

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Just a guess: struts/stick-axle vs. SLA/MHD dampers and IRS...

That would be it. I am impressed with how well Ford has that stick out back working, however.

Between the small course, stock tires, and a slow driver I had no problems with gearing. Change any of those variables, and we will see. I kind of expect that I'll be doing some rowing as each of them are changed.
 

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