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Old 08-19-2012, 04:57 PM   #1
Macrackie
 
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Under steer and my first Auto-X

First off I am hooked. I have been itching to start racing the car and today I did. The only complaint I have as I got faster and started pushing harder I have officialy found under steer especialy if I was still braking when entering the corner.

I have been thinking the bmr 1" drop springs and sways but is there a better starting point if my only complaint is the under steer. I know I haven't found the other limits of the car so in my mind I say "STEP ONE FIX UNDERSTEER" then race more and find my next milestone.

Only other complaint was strugling through the slalom they had set up mostly driver but they had the cones tight. Once again car felt like it didn't want to turn in.

I have a v-6 manual if that changes people's thoughts. I had also run with traction control off and stabilitrack on. On my last pass I did turn off stabilitrack. Under steer almost felt better but possibly only due to allowing the rear to drift around a bit more.

FYI New auto-x junky in the making here.

Thanks guys.
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Old 08-19-2012, 05:04 PM   #2
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To correct understeer you will need front and rear adjustable sway bars and since you are pushing your car pretty hard you will need end links as well. Feel free to hit me up if you have any other questions.
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Old 08-19-2012, 09:47 PM   #3
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Quote:
Originally Posted by Macrackie View Post
First off I am hooked. I have been itching to start racing the car and today I did. The only complaint I have as I got faster and started pushing harder I have officialy found under steer especialy if I was still braking when entering the corner.

I have been thinking the bmr 1" drop springs and sways but is there a better starting point if my only complaint is the under steer. I know I haven't found the other limits of the car so in my mind I say "STEP ONE FIX UNDERSTEER" then race more and find my next milestone.

Only other complaint was strugling through the slalom they had set up mostly driver but they had the cones tight. Once again car felt like it didn't want to turn in.

I have a v-6 manual if that changes people's thoughts. I had also run with traction control off and stabilitrack on. On my last pass I did turn off stabilitrack. Under steer almost felt better but possibly only due to allowing the rear to drift around a bit more.

FYI New auto-x junky in the making here.

Thanks guys.
Autocross Road Course Drag Strip

You'll read a lot of opinions here on C5. You'll also find a lot of good data on C5. Before you buy anything for your 5th Gen I suggest you read The Book of 5th Gen here on C5. The book covers everything from the structure GM designed and built in your Camaro to the how and why of suspension, wheels, brakes, tires and thermal management.

Before you buy anything can I ask what if any modifications you have made to your Camaro?
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Old 08-19-2012, 10:54 PM   #4
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Mods so far as follows:
-Trifecta tune
-Cold air intake
-Axle back exhaust
-18x8 alluminum wheels

And my best mod so far 245/50/18 tires. Car handles completely compared to the stock 55 series tires.
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Old 08-19-2012, 10:59 PM   #5
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great thread! subscribed. i have an LLT M6 and cant wait to get started with my auto-x!!! i have a few friends with mini coopers and 240's etc. that are really into it. I dont even know where to start!
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Old 08-19-2012, 11:04 PM   #6
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Quote:
Originally Posted by Macrackie View Post
Mods so far as follows:
-Trifecta tune
-Cold air intake
-Axle back exhaust
-18x8 alluminum wheels

And my best mod so far 245/50/18 tires. Car handles completely compared to the stock 55 series tires.
Good stuff! Do you have your current alignments numbers?
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Old 08-19-2012, 11:06 PM   #7
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Quote:
Originally Posted by Macrackie View Post
Mods so far as follows:
-Trifecta tune
-Cold air intake
-Axle back exhaust
-18x8 alluminum wheels

And my best mod so far 245/50/18 tires. Car handles completely compared to the stock 55 series tires.
me too! exact same except tune! wat intake? was tune worth the $?
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Old 08-19-2012, 11:06 PM   #8
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well i have 245 55 18 tires
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Old 08-20-2012, 07:57 AM   #9
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Quote:
Originally Posted by JusticePete View Post
Good stuff! Do you have your current alignments numbers?
Alignment is oem with 23000 miles
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Old 08-20-2012, 07:59 AM   #10
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Originally Posted by Chevrole+ View Post
well i have 245 55 18 tires
Switch to some 245/50/18 the car is much more planted on the road. And with the stiffer sidewall and the car starts to slide everything is much more predictable. Doesnt woller around as much without the suv tires
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Old 08-20-2012, 08:43 AM   #11
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Originally Posted by Macrackie View Post
Alignment is oem with 23000 miles
Time to do some alignment work. 5th Gens understeer from the factory. We can address some of that with an alignment.
This alignment will drive much better than your current OE spec alignment.

Front

Camber -1.1
Toe 0.00
Caster Not Adjustable from the Factory

Rear
Camber 0.00 to -0.50
Toe IN 0.10
Total Toe 0.20

The next step in the process is to address the change in alignment angles created by made soft for NVH sub-frame and radius bushes. The four large rubber bushes that hold the entire IRS to the monocoque allowing it to twist creating rear end steering also known as rear end step out. That unsettled feel you have in your rear is a direct result of the IRS assembly twisting while you drive. Pedders EP1200 sub-frame bush inserts will get that under control.

Up front the fluid damped radius arm bushes create a large range f caster change. The caster changes create a some what soft on center feel to your steering. Remove the OEM rubber snubbers from the bushes and replace them with EP6579 inserts. You'll think you just installed a new steering rack.





These critical bush upgrades set the foundation of your Camaro for all future suspension and driveline mods. They immediately improve performance. They prepare your car for the next step which would be a full sway bar set upgrade. Pedders has already tested, validated and proven on track that a Pedderised Camaro is faster than a brand x Camaro. Going back to 2009 at the OPTIMA Challenge following SEMA the Pedders USA Camaro pulled every brand late model American Muscle Car by 5 seconds or more on a single lap. On the short AC run it was the same. Since that day there has not been a single instance where a brand x 5th Gen has beaten a Pedders USA car and believe me, with my big mouth, they are all trying as hard as they can.

Check out these AC videos.




I look forward to discussing your plans to setup your 5th Gen exactly to fit your driving style and skills.
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Old 08-20-2012, 09:22 AM   #12
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Quote:
Originally Posted by Macrackie View Post
First off I am hooked. I have been itching to start racing the car and today I did. The only complaint I have as I got faster and started pushing harder I have officialy found under steer especialy if I was still braking when entering the corner.
Without getting into worries about modifications that move you up in class, one of the autocrossers' mantras is "seat time, tires/wheels, everything else".

I'm not trying to step on anybody's toes here, not yours or those of any vendors.

Seat time
You're almost certainly guilty of "overdriving". Entering a course feature too hot, or starting your braking too late/holding it too long is an absolute guarantee that you'll find understeer.

For slaloms, you need to be aware that you cannot crank the steering wheel from position to position in zero time. If I had to guess, I'd say it takes at least half a second, during which time the car has travelled at least 20 feet. Meaning that you'd have to get your steering started about 20 feet sooner, or visibly before you reach the next cone you're trying to get past. This takes practice, some confidence that it will actually take this time, and a little co-ordination between what you're doing and what the car needs. When you take an instructed course walk and the instructor mentions "getting on the back side of the cone", this is what he's getting at. If you wait until you get to each slalom cone before starting to steer, you're LATE. And you'll thereafter be playing catch-up (unsuccessfully), you'll be slow and probably plowing.

You absolutely need to turn all of the nannies OFF. They aren't there to make you better at driving hard, only to help protect the street-driving morons against their own incompetence, and they do this by insisting on understeer (the average driver tends to either "freeze" or worse, do exactly the wrong thing, when faced with oversteer).

Look where you want to go, not at what you don't want to hit. Hands follow eyes, car follows hands . . . and this is good advice for all of your driving, actually.

On a really good run, you'll frequently feel that you aren't really "stuck down". That's off in your future, though.


Tires/wheels
For now, or at least until you invest in a set of higher performance tires (see class rules for limitations), tire pressure adjustments are what you have available. A little more front tire pressure will make the car turn in (get your turning started) better. A little front to rear tire pressure "stagger" with the rear tires at lower pressure may help get the car to 'rotate', or actually get pointed in the new direction better, and tend to give you a little extra margin against power-on oversteere on corner exit. You'll have to experiment with this.

Everything else
You're best off NOT modifying the car right away, beyond a more performance-oriented alignment. Learn how to drive it at this new level first, which will give you a better idea just what it is you want to fix about its handling (and you'll have had a chance to separate your own driver errors out from the clutter). Learn what different mods do.

If you're trying to stay in a specific class - be careful about what you do to modify your car, or you might find yourself running directly against far more heavily modified cars. But if you're just in it for the experience, or have other criteria such as taking in road course track days or just want to mod for your street use and autocross it wherever it falls, don't worry about this part too much.


Pete and Apex have both made good suggestions. If you even think you might get serious about this, having a few adjustments available (such as for stabilizer bars and shocks/struts) can help you upgrade the car to suit you as you grow as a driver.



Norm

Last edited by Norm Peterson; 08-20-2012 at 09:40 AM.
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Old 08-20-2012, 09:35 AM   #13
JusticePete
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Norm,

Did you know we occasionally make a mistake and cast parts in SCCA Black ;-)
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Old 08-20-2012, 09:45 AM   #14
Chevrole+
 
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Quote:
Originally Posted by Norm Peterson View Post
Without getting into worries about modifications that move you up in class, one of the autocrossers' mantras is "seat time, tires/wheels, everything else".

I'm not trying to step on anybody's toes here, not yours or those of any vendors.

Seat time
You're almost certainly guilty of "overdriving". Entering a course feature too hot, or starting your braking too late/holding it too long is an absolute guarantee that you'll find understeer.

For slaloms, you need to be aware that you cannot crank the steering wheel from position to position in zero time. If I had to guess, I'd say it takes at least half a second, during which time the car has travelled at least 20 feet. Meaning that you'd have to get your steering started about 20 feet sooner, or visibly before you reach the next cone you're trying to get past. This takes practice, some confidence that it will actually take this time, and a little co-ordination between what you're doing and what the car needs. When you take an instructed course walk and the instructor mentions "getting on the back side of the cone", this is what he's getting at. If you wait until you get to each slalom cone before starting to steer, you're LATE. And you'll thereafter be playing catch-up (unsuccessfully), you'll be slow and probably plowing.

You absolutely need to turn all of the nannies OFF. They aren't there to make you better at driving hard, only to help protect the street-driving morons against their own incompetence, and they do this by insisting on understeer (the average driver tends to either "freeze" or worse, do exactly the wrong thing, when faced with oversteer).

Look where you want to go, not at what you don't want to hit. Hands follow eyes, car follows hands . . . and this is good advice for all of your driving, actually.

On a really good run, you'll frequently feel that you aren't really "stuck down". That's off in your future, though.


Tires/wheels
For now, or at least until you invest in a set of higher performance tires (see class rules for limitations), tire pressure adjustments are what you have available. A little more front tire pressure will make the car turn in (get your turning started) better. A little front to rear tire pressure "stagger" with the rear tires at lower pressure may help get the car to 'rotate', or actually get pointed in the new direction better, and tend to give you a little extra margin against power-on oversteere on corner exit. You'll have to experiment with this.

Everything else
You're best off NOT modifying the car right away, beyond a more performance-oriented alignment. Learn how to drive it at this new level first, which will give you a better idea just what it is you want to fix about its handling (and you'll have had a chance to separate your own driver errors out from the clutter). Learn what different mods do.

If you're trying to stay in a specific class - be careful about what you do to modify your car, or you might find yourself running directly against far more heavily modified cars. But if you're just in it for the experience, or have other criteria such as taking in road course track days or just want to mod for your street use and autocross it wherever it falls, don't worry about this part too much.


Pete and Apex have both made good suggestions. If you even think you might get serious about this, having a few adjustments available (such as for stabilizer bars and shocks/struts) can help you upgrade the car to suit you as you grow as a driver.



Norm
thank you very much for the tips!!!! should help out alot in the near future. especially for me. i have never driven *that hard* as i haven't been on an open enough closed course to test my limits.. but going in there for the first time knowing these things should make it more of a sense to me!
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