idolo

I recently purchased 2 brand new RE040's to replace the originals. Same size 225/45/18. The rear 2 failed the pink slip so i replaced those only (will replace fronts soon)

They have been on a week and tonight i drove the car down my favourite road which contains many twisties. To my horror the car is now handling like an absolute piece of crap. DSC kicks in without me even getting slightly radical, in fact without even trying. I can take a long sweeping bend and feel the DSC tapping the brakes constantly.

I am hoping it is just because i have 2 new tyres and 2 old tyres and will be fixed when i change the fronts. I will get to it ASAP as the car is no fun at all like this.

Has anyone experienced the same problem when replacing only 2 tyres. I hope its not the new tyres that are the problem rather just having a new and worn set that is the problem.

mac11

iTrader: (1)

turn it off?

takahashi

Need to rub the new tyre...

Check the tyre pressure.

Have you done alignment lately?

Cromax

Yeah, as taka said, you need to wear them in a bit. From memory, when I got my new set of RE040s, they had little nodule things on them which was causing my car to handle like crap for ~50-100km.

I think Mogley had the same problem a year or so ago as well.

idolo

Not an alignment no, wheels were balanced when the new tyres were fitted however.


Yeah i know new tyres need to scrub in a bit before they grip however i did not expect it to be quite this bad. Don't remember it being like this when the car was new but then again i may have been driving alot easier. Anyway thanks for the info guys.

Cromax

I almost drifted into a kerb after I had a new set of tyres installed on my other car.

I'd say take it easy for a few days, if symptoms persist, get another two tyres

Revolver

There have been some DSC complaints from those with different branded tyres front and rear but this is the first time I've heard of it happening with identical tread patterns, etc.

I tend to agree with the other opinions expressed above. Let them scrub in and then have another lash to see what happens.

Let us know. This is always good feedback to hear. No ESP/DSC system is perfect but I tend to rate the 8's as better than most I've experienced (including some much more expensive euro cars).

auzoom

DSC kicking in is as a result of sensors detecting wheel spin. This could be as a result of 2 things.

The 1st is excessive difference in rolling circumference. Remembering that a tyre has around 5mm of tread. if you are worn right down to the marker then you have reduced 10mm of diameter. This can cause DSC to sense wheel spin sooner than normal.

The 2nd thing is as has been mentioned and that is the mould wax on most tyres which causes them to be slippery for the first few 100 km's.

The combination of these 2 will just make things worse.

Cheers

Andrew

LittleJohn

Here's a kicker.. Don't take this as gospel as it's only observations.
I suspect the systems in the RX8 is a little more clever than this, I believe there is a degree of self calibrating that goes on for all these fancy systems.
If after a few more kms, you find that DSC is still kicking in too early, try disconnecting the battery for a while. (a few mins should be enough)
Once you've done that, perform all the usual resets.

1. Turning your key to acc then pumping the brake a zillion times like a bat outta hell
2. While holding down the trip meter reset button, turn the key to acc. postion. go through all the options and turn the key off then on again.

You might find that after you do this you a few things might act a little odd. Go for a short drive, shut everything down and start her up again. Everything should settle down again and be as you once remembered it.

Cheers
LJ

auzoom

ooo nice one...never though of that! Interested if this is true.

JAT1

1. Turning your key to acc then pumping the brake a zillion times like a bat outta hell
2. While holding down the trip meter reset button, turn the key to acc. postion. go through all the options and turn the key off then on again.



what does this actually do, what does it reset. Are we likely to have to go to mazda to have it reset on the computer after this?

auzoom

resets varying levels of memory. 1st one being a reasonably soft level such as CELs and LTFT. 2nd being basically reseting everything.

rotaryPilot

1) Get a descent alignment
2) Check tire pressures (use the same all around as a starting base)
2) do you have stock shocks, springs, sway bars?

Revolver

LJ's tip reminds me of those Nintendo games where there are secret ways through to the next level.

Why does it have to be that hard???

Cromax

Idolo, what's happening with this?

Was it just the fact that the new tyres had to be worn in a bit?

nugsdad

Sorry but you're now up for new fronts, had the same problem, bottom line is the rolling circumference of the fronts and rears is now different and the slightest slip in grip is picked up by DSC as a major slide and in it cuts.

idolo

I have a feeling this is the main culprit. Might let the new tyres bed in a bit before replacing the fronts so i can test this theory.

Stock as a rock

Not sure yet, the car hasn't really been anywhere i can test it since last time. Will let you know after the weekend.

I suspect you are correct. (although i should never take advice from a Dragons fan ;-)