Over sensitive???

J

jakblade

Active member
 Lincolnshire
Is the DSC over sensitive on z4's or do I have hidden problem???
Following a Leon FR along a well known, well used piece of road went into right hander at a "fair" pace gaining on FR and stutter,stutter blinking dash light and obviously slow up. I personally couldn't see any reason why DSC had to kick in. If a chuffing Seat Leon FR could get round it surely a Z4 can????
Stopped further down the road gave the Zed's tyres a kicking, bouncing corners listening for anything untoward. Nothing obvious.... checked tyre pressures once home seem ok. Unless someone has ideas of settings for 108's with P ZERO non Rft's?? Mine are 33psi rear n 30psi front. Bit hard maybe????
 
could be a faulty sensor somewhere. if your happy to trust yourself with cornering at pace turn it off, otherwise leave it on for safety.
 
I found my e85 dsc kicked in to spoil the party a lot. Bear in mind while we love our Z4s they're not the best cars ever and are ageing now and frequently are out gunned by run of the mill modern cars. Things move on.
 
SonnyA85 said:
could be a faulty sensor somewhere. if your happy to trust yourself with cornering at pace turn it off, otherwise leave it on for safety.
Click to expand...

+1

End of the day it's a safty feature, it's meant to kick in before you get anywhere near the limit. Are you aware it has two settings before its off completely.?
 
Wet or dry road? I've the same year/model on 108's running same tyre pressures but on Eagle F1A's and cant say I've had the system kick in on dry roads without deliberately provoking things. Different in the wet where it does it's job fine. I've posted a few times about the ability of the FR having had one on hire for a few months and I was convinced I'de get A-B quicker in the FR just because it's pretty fool-proof so maybe it's just quicker than our 2.5's.

But the roof don't come off an FR, it sounds rough and I looked like I needed a baseball cap, backwards, according to my darling daughter 8)
 
Cheers for the replies guys.
It was a dry road and we'll known by myself and others around here. If my Z4 gets outperformed by my 2.0l diesel Mondeo estate of the same age that I used to own. And my 1.6l mazda 3.Then I may have to go back to oil burning, family luggage lugger!!!! They have been round those bends many a spirited time with no issues.

DSC has two settings???? More info required.
I know it's a safety feature but if it kicks in that early, why own a sports car?? I didn't think that i was anywhere near the cars or my limit. In fact all felt really good until it kicked in.... :headbang: May as well put my head on backwards and buy a hatchback..... Oh I already one of those. Maybe should spend my hard earned on the Mazda?????

Yeah. Right. Like that's gonna happen??
 
OK. After searching through Forum bumpff. Went to garage and had tyres pressures set to 36psi rear, 33psi front. Got Nitrogen in them hence the reason of the garage visit. He did fronts then I checked with my gauge,which I've tested against calibrated gear at work, his said 33psi mine said 36psi. When he did rears to 36psi again checked with mine and 36psi.... :? So we tried at different pressures and all read same except for when his was at 33psi. Soooo, set up with my gauge, very helpful chappie.

Went down the same piece of road today "Haahmmm cough" at slightly brisker pace a couple of times and no issues...... :thumbsup:

Amazing,if it was just tyre pressure, how much it affected the car.......or I wasn't going "brisk" enough yesterday?? :driving:
 
Usually it's only in the wet I've had any issues.

I found that the end of their life Vredestein Ultrac Sessanta just didn't have the grip in the wet and this caused all the issues. Only once since the Goodyear Eagle F1 AS2 were fitted have I had any lights on the dash due to coming off a roundabout a bit too quickly.

Get the odd warning at the same junction sometimes when it's wet. Think this is more due to the road condition than anything else as there's no problems in the dry.

Is it new tyres? Old tyres?

There's plenty of info on here about tyre pressures and different feel of these cars when driving depending on the tyre pressures.
 
skelters said:
Is it new tyres? Old tyres?

There's plenty of info on here about tyre pressures and different feel of these cars when driving depending on the tyre pressures.
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TBH the tyres all round are fairly new probably done 400ish miles. That maybe an issue too from what I've read. Although after that mileage would have thought they were scrubbed in by now.

Still interested about the 2 levels of DSC if anyone knows anything.
 
jakblade said:
Still interested about the 2 levels of DSC if anyone knows anything.
Click to expand...

In another thread said:
My understanding of the three stages of control are as follows.

Normal - No lights on dash - Car will detect slip and pull throttle control and apply brakes to relevant wheels. No fun allowed.

DTC mode - DTC light on dash - Car will now allow some fun, won't pull throttle control but will still apply brakes to relevant wheels if it detects lateral slips. Fun with a safety net.

DTC/DSC off mode - Yellow triangle symbol on dash - You're on your own. Car will do nothing to stop slip and slides. ABS is your only saviour.
Click to expand...
 
I've found the DSC my E89 particularly sensitive with higher tyre pressures. I wonder if this is something to do with RFT tyres?
 
jakblade said:
DSC has two settings???? More info required.
Click to expand...

Press for half a second and "DSC" will illuminate on the dash. This mode "allows" some wheel slip, supposedly for better traction on snow/sand (yeah right) It also allows a nice power tail "waggle" coming out of corners :D Pressing it again for a bit longer turns off the DSC and illuminates the "spinning wheel" type light, this apparently is completely off, aka "DONUT MODE" don't ask me how I know :evil:

Pressing once again for half a sec or so put it back into "Wife" mode :fuelfire:

As an aside, in mine, I don't think I've ever had it kick in when I haven't expected it to, ie only when I've been going for it. easy to provoke it on a corner with a little bit of a hoof, but mine's a 3.0...

Mike
 
From Page 17...

http://www.bmwclub.lv/files/06_E85_Chassis_Dynamics.001.pdf

Dynamic Stability Control
Purpose of the System
The Dynamic Stability Control system (DSC MK 60) currently in the E46 is carried over to
the E85. In addition to the ABS, ASC and CBC functions, the DSC system incorporates a
further function in the E85, Dynamic Traction Control (DTC). The DTC function can be activated
with the DSC button and provides two subfunctions:
• Sports tuning of the Automatic Stability Control (ASC) + Dynamic Stability Control (DSC)
• Improved traction, particularly on ground surfaces with a low coefficient of friction
All other functions have essentially remained the same. A "DTC" indicator light illuminates
in the instrument cluster when the DTC function is activated. The DSC warning light in the
instrument cluster flashes when intervention is necessary and takes priority over all other
functions (as in current E46 vehicles).
In certain situations (i.e. accelerating on an uphill gradient on a snow covered road), the previous
ASC function provided brake intervention at the spinning wheel and extremely
reduced the engine output. Although the vehicle remained extremely stable, minimal
propulsion was available.
DTC achieves maximum possible traction essentially by expanded ASC and DSC control
thresholds. Compared to the ASC/DSC function, DTC mode allows a little more "drift" at
low speeds and transverse acceleration (increased rear wheel spin is permissible up to a
speed of approx. 45 mph). This allows the engine power output to remain without an
extreme reduction of power, improving propulsion.
On approaching higher speeds and transverse acceleration (measured by the yaw rate sensor),
the DTC function acts more and more like the "normal" ASC and DSC function and
the slip thresholds are reduced back to a conservative mode for stability reasons.
 
Ducklakeview said:
jakblade said:
DSC has two settings???? More info required.
Click to expand...

Press for half a second and "DSC" will illuminate on the dash. This mode "allows" some wheel slip, supposedly for better traction on snow/sand (yeah right) It also allows a nice power tail "waggle" coming out of corners :D Pressing it again for a bit longer turns off the DSC and illuminates the "spinning wheel" type light, this apparently is completely off, aka "DONUT MODE" don't ask me how I know :evil:

Pressing once again for half a sec or so put it back into "Wife" mode :fuelfire:

As an aside, in mine, I don't think I've ever had it kick in when I haven't expected it to, ie only when I've been going for it. easy to provoke it on a corner with a little bit of a hoof, but mine's a 3.0...

Mike
Click to expand...

In another thread said:
My understanding of the three stages of control are as follows.

Normal - No lights on dash - Car will detect slip and pull throttle control and apply brakes to relevant wheels. No fun allowed.

DTC mode - DTC light on dash - Car will now allow some fun, won't pull throttle control but will still apply brakes to relevant wheels if it detects lateral slips. Fun with a safety net.

DTC/DSC off mode - Yellow triangle symbol on dash - You're on your own. Car will do nothing to stop slip and slides. ABS is your only saviour.
Click to expand...
[/quote]
Cheers for the info guys.... :thumbsup:
 
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