Can I Put 19in's On A Bf Turbo

[tur]

So its a do it but wont work to how its designed to, or its a BIG NoNo

[SavageF6]

Depends on whether your willing to risk it. As the replies above said, it may affect calibration, to what degree is unknown. DSC will still activate, but its reactions/corrections may not be 100% as expected if you've played with suspension or wheels. Just dont go changing the brakes though...

Edited 28/10/06 11:17 AM by SavageD

[tur]

Thanks

[Slash737]

thanks fordtech, makes sense to me. hopefully wont be needing the dsc very often so all should be good. when I do get the car all do some test in the wet and see what the dsc actually does/feels like.

[Mildman]

So if the factory offers the option of 17's or 18's - is the DSC performance compromised when you go to a 18 inch wheel?

Or is Ford able to alter the calibration slighty for the 18's?

[FORDTECH]

So if the factory offers the option of 17's or 18's - is the DSC performance compromised when you go to a 18 inch wheel?

Or is Ford able to alter the calibration slighty for the 18's?

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Spot on.Unfortunately it's not something that the dealers can do though due to it being a safety item(You know,legal stuff and all that).

[obi]

thanks fordtech, makes sense to me. hopefully wont be needing the dsc very often so all should be good. when I do get the car all do some test in the wet and see what the dsc actually does/feels like.

←

It is very good & you will be surprised how quick it reacts. When it accidently happened to me in the wet I instantly thought "Crikey I'm a bloody top driver" untill it sinks in that it was the DSC that done all the work.

[replicant]

The DSC setup in the BF is a Bosch 8 unit. The circumference of the wheel and tyre combo is one of the variables for the DSC... why because the DSC uses the ABS sensors in each wheel to determine the rotation speed and based on the circumference knows the wheel speed as a variable to determining whether to intervene, it will also affect the duration and severity of the intervention...

The DSC will initially brake individual wheels to correct the yaw (under/oversteer) movement past what it considers appropriate and may intervene at the engine ECU level by retarding ignition to reduce power (generally it won't change the throttle position or injector duty as this will alter the response once the yaw is corrected).

The DSC is pretty sensitive to calibration - brake pad friction is one of the factors in the DSC programming to assist in deciding how long and how hard to apply the brakes to a wheel and it isn't a simple backyard operation to calibrate either. The calibration for most of the BF DSC equipped Fords relies on having the 'premium' brake system out of the V8 equipped and Barra 245T cars, the 17 inch wheel/tyre combo, ZF six speed auto as well as the 'sports suspension' package (which is the ESP option in the BF2 for Barra N/A cars).

There is a separate DSC calibration for the Ghia with Barra N/A and 230kW SOHC V8 Ghias in BF although I'm wondering if this has been changed for BF2 as my drive impression was that it intervened way too early for most enthusiast drivers in BF (actually given who orders a Ghia vs an I-Design Luxury pack in a XR6T or an XR8 maybe the DSC calibration should stay as is!).

The intervention in the Barra 245T and Boss 270 engine XR cars is very different in calibration to the Ghia calibration. I'm wondering if the ESP cars get the Ghia Calibration or one based on the XR series...

Anyway, the DSC operates in split seconds - if you change the wheel/tyre combo, the brake pads or rotors, potentially the engine tune, it won't work in the way it was intended to do by the folk who calibrated the software. However, if the variables don't change significantly then remember this is a Ford Falcon not an F1 car then the change should not affect the car too much.

However, just remember if you have a plus 2 wheel fitment then it's likely that it will have more mechanical grip from a larger contact pad. So it's entirely possible that when the unwanted yaw movement occurs then you are going to be going faster than in regularly shod car and that the intervention of the DSC is going to have be faster and more decisive than was originally intended with the original fitment.

In other words, with better wheels and rubber hoops when the moment comes, the DSC is going to have make it's mind up a lot faster and work harder to correct things and you going to be going faster and therefore more inertia and energy is involved... and as one of my colleagues who worked in road safety once told me, more energy means harder impacts and importantly greater deceleration on the relatively brittle parts of the human body.

Maybe some exploration in a controlled environment say a track day in wet conditions may yield some clues about the limits and behaviour of your car and the DSC with the different wheel/tyre that would be useful long term, perhaps?

[tur]

To good, maybe Motor or WHeels could do a test with the xr6 turbo with different tyre and rim packages as to what happens.