STi - Driver's Control Centre Differential
Discussion
Morning all.
I've had my 2008 WRX STi hatch for three months now. Its my 5th Impreza in 10 years but the first scooby i've owned with a DCCD.
In the wet I'm locking the diff as I pressume this will give additional grip when cornering but I cant really tell the difference compared to when teh diff is in its normal setting.
Should I be able to notice the difference when cornering hard in the wet..?
Cheers
Stu
I've had my 2008 WRX STi hatch for three months now. Its my 5th Impreza in 10 years but the first scooby i've owned with a DCCD.
In the wet I'm locking the diff as I pressume this will give additional grip when cornering but I cant really tell the difference compared to when teh diff is in its normal setting.
Should I be able to notice the difference when cornering hard in the wet..?
Cheers
Stu
You'll notice the difference between having it set to open ( 70:30 rear:front torque split) and locked (50:50 torque split). It's not quite so obvious between set to auto and locked, until you have to turn with full steering lock then it will bang and crash like a goodun with the diff locked. I tend to drive with the diff open most of the time, it's essentialy RWD and much more fun. I'll lock the diff if I'm going across a muddy field, and set it to auto on boring motorway trips or short runs.
Edited by Syndrome on Tuesday 24th November 09:20
Syndrome said:
You'll notice the difference between having it set to open ( 70:30 rear:front torque split) and locked (50:50 torque split). It's not quite so obvious between set to auto and locked, until you have to turn with full steering lock then it will bang and crash like a goodun with the diff locked. I tend to drive with the diff open most of the time, it's essentialy RWD and much more fun. I'll lock the diff if I'm going across a muddy field, and set it to auto on boring motorway trips or short runs.
What he said. The diff-lock is pretty good in snow too, other wise I wouldn't have it locked because of the juddering at low speeds. Lets face it whether the diff is open or locked you're going to have to be going some to make it lose grip on the public road. I've had my STi for 3 years now and I've only had one real moment on the road (standing water + RE070 tyres = brown moment)Edited by Syndrome on Tuesday 24th November 09:20
For tyres, Yoko Parada Spec 2.. Better than the Falkens. But the Bridgestone is not a bad tyre though.
Been out as a passenger in a My04 Sti Spec C, with the RE070 in the winter (Damp Greasy roads), they can grip well in all conditions managed a run from Guildford to Woking in 6 minuts in the wet!
Been out as a passenger in a My04 Sti Spec C, with the RE070 in the winter (Damp Greasy roads), they can grip well in all conditions managed a run from Guildford to Woking in 6 minuts in the wet!
When driving the car hard, different differential locking ratios are making the car act different.
Fully down* (*open) (36:64) it will make the car the most RWD- biased = slower on the corners but it turns well. You will have to steer the front tires more active since wider yaw.
On LOCK (50:50) posistion the front and rear -axles will spin at same ratio. Fastest way around a corner but you have to use more effort turning the car into a corner. Less steering required since smaller yaw.
These conditions only apply on when driving extremely hard but the basics are the same for smaller or easier drive. You may feel some cluncking if more than fully down position is applied, and they are advised only to use on harder conditions (wet, gravel, snow).
Fully down* (*open) (36:64) it will make the car the most RWD- biased = slower on the corners but it turns well. You will have to steer the front tires more active since wider yaw.
On LOCK (50:50) posistion the front and rear -axles will spin at same ratio. Fastest way around a corner but you have to use more effort turning the car into a corner. Less steering required since smaller yaw.
These conditions only apply on when driving extremely hard but the basics are the same for smaller or easier drive. You may feel some cluncking if more than fully down position is applied, and they are advised only to use on harder conditions (wet, gravel, snow).
Newer STI's like yours have the AUTO- option in the DCCD control and this optimises the settings depending on the condition and various parametres given from certain sensors. So if you want to have the fastest setting, you will either have to choose that are you going to drive the car (MANUAL 36-64 <-> 50:50 LOCKED) or is the car going to help you drive the car (AUTO). You will have to practise what suits you best. In theory the AUTO setting should be the fastest, but you will have to learn and adapt to the way the system works. Basically it will only change the differential ratio depending the the exact moment of vehicle movement. If the car senser that you are going in to the corner and you would need more turn- in, it will add more ratio in to the back. Then when it senser that you've cleared the apex of the corner and you want to start straighten the vehicle, it will add more ratio into the front. Making it faster.
You really should do into somewhere where you could safely practice and start knowing your car better. Its all about physics afterall.
Thank you,
Ville, a Subaru driver from Finland
You really should do into somewhere where you could safely practice and start knowing your car better. Its all about physics afterall.
Thank you,
Ville, a Subaru driver from Finland
There is a video floating around on the interweb of Toshi Arai demonstrating the difference between DCCD settings of an '08 STI on a wet test track, is a bit of fun and quite interesting.
ETA: Found it.
http://www.youtube.com/watch?v=tRrejHG4gl0&fea...
ETA: Found it.
http://www.youtube.com/watch?v=tRrejHG4gl0&fea...
Edited by GravelBen on Tuesday 15th December 06:56
vertastic said:
...and quite different from the older scoobs.
Very similar demonstration of DCCD in a Ver.2 STi-RA
http://www.youtube.com/watch?v=zHZSgXXC2x8
No auto mode back then though.
Edited by GravelBen on Tuesday 15th December 08:44
GravelBen said:
He just wants to be like Stefan Roser
Actually, I seem to recall Senna wearing similar shoes in a video testing the NSX as well.
Maybe I should get some in case they make me a better driver...
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