ACD Tuning Options - USDM CT9As, Read!
Modifying the yaw angle is primarily the rear diff's job. Maintaining some controllable oversteer is a lot easier to achieve with getting a new rear diff (more aggressive ramp angle plate LSD) or just making sure your USDM 8/9 rear LSD was put together properly.
Creating a polar moment with the center diff is much harder, but it works. USDM 8/9's understeer and send a lot of power to the front wheels which just turns into wheelspin. By clamping the ACD earlier and with more force it preserves a more neutral feel and gets the distribution back to 50:50.
Asking which is better to tune or which to tune first is a hard question. Doing the ACD and the rear diff yields great results but doing either individually is kind of a toss up.
It's nice to have AYC because you can do it all electronically.
Generally doing the ACD tuning will yield better braking, better turn in, and better exit speeds, eliminate understeer and promote neutrality. Doing the rear diff upgrade will yield more power oversteer.
Creating a polar moment with the center diff is much harder, but it works. USDM 8/9's understeer and send a lot of power to the front wheels which just turns into wheelspin. By clamping the ACD earlier and with more force it preserves a more neutral feel and gets the distribution back to 50:50.
Asking which is better to tune or which to tune first is a hard question. Doing the ACD and the rear diff yields great results but doing either individually is kind of a toss up.
It's nice to have AYC because you can do it all electronically.
Generally doing the ACD tuning will yield better braking, better turn in, and better exit speeds, eliminate understeer and promote neutrality. Doing the rear diff upgrade will yield more power oversteer.
Modifying the yaw angle is primarily the rear diff's job. Maintaining some controllable oversteer is a lot easier to achieve with getting a new rear diff (more aggressive ramp angle plate LSD) or just making sure your USDM 8/9 rear LSD was put together properly.
Creating a polar moment with the center diff is much harder, but it works. USDM 8/9's understeer and send a lot of power to the front wheels which just turns into wheelspin. By clamping the ACD earlier and with more force it preserves a more neutral feel and gets the distribution back to 50:50.
Asking which is better to tune or which to tune first is a hard question. Doing the ACD and the rear diff yields great results but doing either individually is kind of a toss up.
It's nice to have AYC because you can do it all electronically.
Generally doing the ACD tuning will yield better braking, better turn in, and better exit speeds, eliminate understeer and promote neutrality. Doing the rear diff upgrade will yield more power oversteer.
Creating a polar moment with the center diff is much harder, but it works. USDM 8/9's understeer and send a lot of power to the front wheels which just turns into wheelspin. By clamping the ACD earlier and with more force it preserves a more neutral feel and gets the distribution back to 50:50.
Asking which is better to tune or which to tune first is a hard question. Doing the ACD and the rear diff yields great results but doing either individually is kind of a toss up.
It's nice to have AYC because you can do it all electronically.
Generally doing the ACD tuning will yield better braking, better turn in, and better exit speeds, eliminate understeer and promote neutrality. Doing the rear diff upgrade will yield more power oversteer.
Matt
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Joined: May 2009
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From: parts unknown
does anyone have any experience running a wide body kit along with the acd re-flash and dif upgrade combo? im planning on doing both upgrades with GTworx springs , whiteline FSB and RSB and maybe later down the line a voltex wide body kit with some 17x10's..im wondering if the wide traction will help or just be overkill..
does anyone have any experience running a wide body kit along with the acd re-flash and dif upgrade combo? im planning on doing both upgrades with GTworx springs , whiteline FSB and RSB and maybe later down the line a voltex wide body kit with some 17x10's..im wondering if the wide traction will help or just be overkill..
Matt
Some folks may disagree but I really feel that the first of those two mods imo would be the acd flash---- IF that flash is one that does NOT cause the binding issue like the GS race flash. I only got rid of the binding after my TRE rear diff was put on. The advantage with an acd tune is that you get a couple different settings of how aggressive you want it to be. That really is a nice feature for when it starts to rain in the middle of your track day.
With the ACD tune you have different maps with different levels of aggresiveness. Just like a swaybar which may have different settings for stiffness, for example. With a TRE rear diff your really limited to changing its aggresivness-- mostly with just using different fluids with different levels of friction modifiers. my .02
What do you guys recommed... ACD tunning or gruppe-s? Looking for a street/track set up (mostly street with monthly trips to track)... Was looking at the race set up from gruppe-s or the acd tunning street, track and autocross setup (Stage 3- 3 map flash) ...Any input is greatly appreciated 
Have read about the binding on tight turns on the gruppe-s acd flash but sounds like nothing on the acd tunning flash... Kinda leaning toward the acd tunning flash but find myslef confused...
Also note that I will be ordering a TRE diff once Jon at TRE is back up and running!
Have read about the binding on tight turns on the gruppe-s acd flash but sounds like nothing on the acd tunning flash... Kinda leaning toward the acd tunning flash but find myslef confused...
Also note that I will be ordering a TRE diff once Jon at TRE is back up and running!
What do you guys recommed... ACD tunning or gruppe-s? Looking for a street/track set up (mostly street with monthly trips to track)... Was looking at the race set up from gruppe-s or the acd tunning street, track and autocross setup (Stage 3- 3 map flash) ...Any input is greatly appreciated
Have read about the binding on tight turns on the gruppe-s acd flash but sounds like nothing on the acd tunning flash... Kinda leaning toward the acd tunning flash but find myslef confused...
Also note that I will be ordering a TRE diff once Jon at TRE is back up and running!
Have read about the binding on tight turns on the gruppe-s acd flash but sounds like nothing on the acd tunning flash... Kinda leaning toward the acd tunning flash but find myslef confused...
Also note that I will be ordering a TRE diff once Jon at TRE is back up and running!