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Old 04-24-2011, 08:36 PM   #1
Leadsled124
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Default Track advice with DCCD setup. Auto=more tire wear

Interested to see what DCCD setting you guys use at the track. Auto or fully open? Id prefer 07 and older guys chiming in since their dccd seem to react differently, but any comments are welcome.

When im in Auto mode the center diff grabs and binds a lot more, and im wondering if thats why i got very uneven chunky tire wear last time. Just pulling into my garage with minimal gas when i turn i feel it bind. ive heard this from a few other 06-07 owners. All the 08+ guys say auto is smooth no chatter. Latley ive been putting the car in full open everytime i drive or carve the canyons. Also us pre 08 guys do not have a auto +/- setting. i never know what your talking about when you say that.

So is full open quicker on the track assuming you can keep the car under control? I have much racing experience in the past but never had any nannies or traction control etc to deal with. Going back to the track in a week just looking for advice thanx
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Old 04-25-2011, 06:26 PM   #2
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Nobody has any advice on dccd settings at the track? BTW the title was supposed to have a "?" at the end but i cant edit that.
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Old 04-25-2011, 06:30 PM   #3
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auto from what i hear
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Old 04-25-2011, 07:53 PM   #4
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I have an '06 STI transmission in my Legacy, controlled by a Spiider controller. I typically leave it in Auto for auto-x stuff. Really haven't done much open track time with it.

I've definitely never experienced any sort of binding, low speed or high speed, nor have I ever read about others having issues with it.
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Old 04-25-2011, 08:11 PM   #5
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Yeah Ive never heard of binding in auto. Ill start to get binding at full lock turns while in manual.
Ive messed around with it auto/ man for auto x. to me honeslty two from the rear makes the car feel more planted. but that for auto x which has sharper and much more of a durastic changed in direction and speed.
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Old 04-25-2011, 08:17 PM   #6
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I think he's talking about the stock STi system, and the stock "auto mode" is not adjustable like it is with my systems.

He basically is running what it would be like in auto mode on my controller having the knob turned about 3/4 or higher setting. Pretty aggressive in terms of maintaining lock, and a solid amount of understeer on the road/track.

I think this explains the wear on your front(?) tires.
Is the wear even front to rear? Does the car understeer entering corners?
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Old 04-25-2011, 10:58 PM   #7
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Quote:
Originally Posted by DCCDPro View Post
I think he's talking about the stock STi system, and the stock "auto mode" is not adjustable like it is with my systems.

He basically is running what it would be like in auto mode on my controller having the knob turned about 3/4 or higher setting. Pretty aggressive in terms of maintaining lock, and a solid amount of understeer on the road/track.

I think this explains the wear on your front(?) tires.
Is the wear even front to rear? Does the car understeer entering corners?
Yes that is exactly how it feels. A little understeer entering corners and some chunking on mainly the fronts. The only reason i figured the biinding was normal is because the manual says "this may happen it is normal", and a few other sti's claimed the same thing in day to day driving
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Old 04-26-2011, 05:09 PM   #8
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Yeah, I suspected that as the case.

I personally think that the 07's understeer too much in auto mode...the 08'+ is brilliant though!

Not much you can do with it really. There is no reprogramming them.
Rocket Rally makes a drop in replacement board...for $2k plus $700 per program, lol.
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Old 04-26-2011, 08:51 PM   #9
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Quote:
Originally Posted by DCCDPro View Post
I personally think that the 07's understeer too much in auto mode...the 08'+ is brilliant though!
Why/how? And which setting?
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Old 04-28-2011, 01:00 AM   #10
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Originally Posted by DCCDPro View Post
Yeah, I suspected that as the case.

I personally think that the 07's understeer too much in auto mode...the 08'+ is brilliant though!

Not much you can do with it really. There is no reprogramming them.
Rocket Rally makes a drop in replacement board...for $2k plus $700 per program, lol.
Are you saying thats due to the dccd programming or to something else like the a arm change? Im an 06 but not sure about any dccd changes
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Old 04-28-2011, 10:26 AM   #11
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^^

Good questions. As far as I know the only change to the '07 suspension wise is the LCAs that have less caster....
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Old 04-28-2011, 11:24 AM   #12
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screw it! time to just hire some computer programming wiz to write a controller for a standalone unit that utilized a 3 axis g-sensor, steering, brake and throttle input...well clutch too actually. I can see some strategic uses of a clutch signal.

Now where did my Fundementals of Vehicle Dynamics book (by Gillespie) go?


Back on topic, didn't 07 get a widened rear track (I know it changed at some point)? It also has the FWD biased center diff gearing (like 06).

Edit: Ok, so only the 04 had a different rear track width.

Last edited by Homemade WRX; 04-28-2011 at 11:39 AM. Reason: Edit: found dimensions
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Old 04-28-2011, 11:35 AM   #13
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I have 07 STI, I always set the DCCD at full open all the time. At auto it loves to bind
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Old 04-30-2011, 07:52 PM   #14
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^^^Yeah exactly, I think the stock auto mode is too tight on the 07's for track use personally.
I don't think its anything to do with suspension/geometry.
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Old 05-01-2011, 12:07 AM   #15
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Quote:
Originally Posted by berdugo
I have 07 STI, I always set the DCCD at full open all the time. At auto it loves to bind
Mine binds at auto too on tight low speed turns. I never thought about dd'ing on open to get rid of that. I also have forgot to play with it at the track, hopefully I will remember this weekend. I'll post up my results ( and hopefully times associated with them too so I have some quantitative evidence for at least how I drive).
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Old 05-01-2011, 12:08 AM   #16
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Quote:
Originally Posted by berdugo View Post
I have 07 STI, I always set the DCCD at full open all the time. At auto it loves to bind
^^^ Im glad to hear that because that means my binding is somewhat normal and theres not anything wrong in the drivetrain. Lately i've been doing exactly that. Its almost a habit now to click into manual full open soon as i start my car
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Old 05-01-2011, 03:44 PM   #17
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Quote:
Originally Posted by Leadsled124

^^^ Im glad to hear that because that means my binding is somewhat normal and theres not anything wrong in the drivetrain. Lately i've been doing exactly that. Its almost a habit now to click into manual full open soon as i start my car
Same thoughts exactly. I thought it was abnormal but after seeing all these posts I feel a little better. At least that means we have a strong center diff that is too strong on auto at low speeds
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Old 05-01-2011, 04:22 PM   #18
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I don't get any binding in daily driving or auto-x. I have been fighting understeer but I believe that is from other sources...
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Old 05-01-2011, 05:16 PM   #19
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I don't get any binding in daily driving or auto-x. I have been fighting understeer but I believe that is from other sources...
But what year do you have? So far from what I have gathered it seems to be an 07 thing. I don't get it at autox, mainly low speed stuff as I am turning while letting out the clutch. Once the clutch is out all the way I don't really get it at all. I can do steady speeds turns at full lock and not get it either, so it seems to only be in the 0-5mph range for me at least.
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Old 05-01-2011, 06:21 PM   #20
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The trouble with running on an "open" setting, is that you get benefit coming out of the corners from the awd system.

What you want is to enter the corner nearly open and exit with proportionate lockup as you straighten out "on throttle". This is something I worked very hard to perfect with my controllers. Putting it in open just means you lose traction and time out of every corner. This is only on sharp corners where you need to get moving again...on long sweepers, who cares.
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Old 05-01-2011, 07:40 PM   #21
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Quote:
Originally Posted by RallyLegacy View Post
But what year do you have? So far from what I have gathered it seems to be an 07 thing. I don't get it at autox, mainly low speed stuff as I am turning while letting out the clutch. Once the clutch is out all the way I don't really get it at all. I can do steady speeds turns at full lock and not get it either, so it seems to only be in the 0-5mph range for me at least.
Its an 06 thing as well seeing im 06
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Old 05-01-2011, 08:08 PM   #22
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Quote:
Originally Posted by DCCDPro View Post
The trouble with running on an "open" setting, is that you get benefit coming out of the corners from the awd system.

What you want is to enter the corner nearly open and exit with proportionate lockup as you straighten out "on throttle". This is something I worked very hard to perfect with my controllers. Putting it in open just means you lose traction and time out of every corner. This is only on sharp corners where you need to get moving again...on long sweepers, who cares.
I actually just got back from the track today. I tried full open and auto. In full open it was kinda fun because in the tight switchbacks you can actually kinda get the rear end a bit loose and kinda pitch it in the direction you wanna go, but comparing lap times auto mode was a few tenths faster constantly. Your right too exiting the tight turns, especially this uphill turn exit at my track open tended to push out to much
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Old 05-01-2011, 08:11 PM   #23
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That "open" rwd feeling is super fun...I have to admit.
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