DSC modes

[Django91]

Can someone please explain to me how the different DSC modes differ on the RX8?
From what I understand, DSC ON offers stability control as well as traction control, DSC off means stability control off but traction control remains on. And the final mode if you hold it in for 7 seconds, is all systems off, is this true? I have heard the car applies brakes and some form of LSD vectoring in the first two modes, is this the case?

Thanks

[ChrisHolmes]

IIRC A short press switches off the traction/ stability control, but leaves the ABS operational. A long press turns off the ABS too. Edited see Daves post below
Traction control and Stability Control are one in the same systems. When cornering or braking hard the system senses a breakaway situation and applies the brake of the relevant wheel or wheels to effect direction control and simultaneously the power may also be reduced.

[Django91]

The ABS is always on, unless you pull the fuse or take the bulb out of the centre brake light, so the system self-test fails.

A short press of the DSC button turns the Traction/Stability Control down, so it will only engage in extreme conditions.
A long press switches the Traction/Stability off completely.

[ChrisHolmes]

Thanks Dave, I have lived under a misconception for too long!

[30405]

interestingly,... if you read the owners manual, it says a short press is off, a long press causes the system think there is a fault with the switch and brings the error light on...

[Dr. FrankenRex]

interestingly,... if you read the owners manual, it says a short press is off, a long press causes the system think there is a fault with the switch and brings the error light on...

This was my understanding. Likewise I haven't personally found a way to get it to engage when it has just been pressed once - so unless someone has had it engage when turned off with a single press then I'm inclined to believe the manual on this one. The only - very specific - scenario I know of is that some people report issues when doing a dyno run with just a single press, but then I believe they need to resort to the removing of fuses to overcome that issue?

As has been said, though, ABS is always on unless there is a fault detected with the system which results in the brake warning light on the dash. And by fault with the system that could be from human intervention lol.

[untakenname]

When we had the group dyno session I'm pretty sure that the DSC was kicking in on my run even though it was meant to have been disabled as it only put down 137 hp which if it were a true output would be very noticeable on the road.

One press of the DSC seems to allow for more slip angle before kicking in but it's still definitely enabled.
Had it short pressed and along the last corner of Brands Hatch before the straight the system was still kicking in massively so had to hold it down fully to stop it interfering, found the laptime difference with it disabled was a couple of seconds quicker per lap back last December on the indy track.

[Dr. FrankenRex]

I stand corrected then

[V8 Power]

I’m not 100% certain it is fully off even with the long press.
I remember experimenting at Rockingham a few years ago and even with it supposedly fully off I’m sure it was still killing power when taking liberties around the Tarzan corner.

[qwakers]

easy way to get fully off is to unplug a abs sensor, will got into fault and no abc tsc or dtc.

[Django91]

The ABS is always on, unless you pull the fuse or take the bulb out of the centre brake light, so the system self-test fails.

A short press of the DSC button turns the Traction/Stability Control down, so it will only engage in extreme conditions.
A long press switches the Traction/Stability off completely.

Based on my experience I believe this to be true, with one press the car stops applying brakes at different corners when needed, but traction control will come in if you try launch the car etc. In fully OFF mode( 7 second hold), all aids except ABS are off

[mrspiller]

So
Can you disable it once the car is in motion ?


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[ChrisHolmes]

You can find out on Saturday!

[mrspiller]

Ha ha
That’s why I’m asking
When I forget to turn it off , I do it whilst driving , well think it does .
Have since been told it’s not possible to disengage whilst in motion


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[Ollie]

Would be a safety feature that it's not able to be turned off in motion for obvious reasons. Imagine if the button some how got pressed mid corner on a normal road and you wanted those functions active. Ooft.

[qwakers]

turns off in motion just fine.

[casey]

I'm fairly sure you can hold the button in for 7 seconds when driving to disengage the DSC/TC. I'm pretty sure I've done that when on a long straight on a trackday when I forgot to turn it off before going on circuit.

I should add, I only tend to turn it completely off when it's interfering too much and the track is dry!

[mrspiller]

turns off in motion just fine.

Thanks once again Qwakers
I thought the same , but was told otherwise
That’s how she slides in the wet then


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[mrspiller]

I'm fairly sure you can hold the button in for 7 seconds when driving to disengage the DSC/TC. I'm pretty sure I've done that when on a long straight on a trackday when I forgot to turn it off before going on circuit.

I should add, I only tend to turn it completely off when it's interfering too much and the track is dry!

Sounds about right
Thanks Malcolm






Any one seen Neil Parry



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[warpc0il]

I find, even on a dry track, the DSC is useful to indicate when you're trying too hard.

My best lap times are with DSC enable and the light just giving the occasional blink but not getting intrusive.
It's still possible to steer with the throttle with DSC enabled.

I have seen an 8 on track with the rear discs glowing, which we assumed was a sticking handbrake, but later discovered it was the lead-footed driver trying to overcome the traction control.

[New Duke]

I'm fairly sure you can hold the button in for 7 seconds when driving to disengage the DSC/TC. I'm pretty sure I've done that when on a long straight on a trackday when I forgot to turn it off before going on circuit.

I should add, I only tend to turn it completely off when it's interfering too much and the track is dry!

No need to be fairly sure, you can be 100% certain you are right.
I've cycled the DSC off/on/off plenty of times while on a lap.

Turned it off once approaching the hairpin at a frozen damp Mallory Park at Ranjan's insistence. Never doing THAT again

[ChrisHolmes]

I had a total lock up, no ABS, at the Mallory Hairpin in the dry which was scary.

[casey]

I find, even on a dry track, the DSC is useful to indicate when you're trying too hard.

My best lap times are with DSC enable and the light just giving the occasional blink but not getting intrusive.

I'd agree, in 90% of circumstances, even in the dry, I find the DSC/TC a useful guide as to when I'm trying too hard and leave it on.

The only situation I know for certain that the DSC/TC was losing me time was at a dry Javelin Sprint event at Woodbridge a few years ago. There were several tight corners where power was being cut coming off the apexes. There was one other RX-8 at the event who had his DSC/TC off and was posting better times, but he was a more experienced sprint driver and set his car up for sprinting, so put it down to that. But for my last 2 runs I turned everything off and the car felt much better through those corners. The sprint times confirmed that, getting much closer to the times posted by the other RX-8.

[Will66]

The Fault message is to cover Mazda's back, that's when it is fully off and won't come back on. Pressing the button once means you can pull a smokey wheelspin start but it will come back on if the yaw detector thinks you're being a fool! Holding the button in until the system thinks there is a fault means it's all off. I tend to only mess with mine on track.