E90 320d Msport - DTC flashing around bend

[Lizzard]

:withStu: Please let us know on Wednesday what happened

 

[Spannie]

I think your issue is rear suspension setup. I've had Nankang tyres on a previous car and they were excellent, very grippy in the dry and wet.

 

[Deon Rupnarain]

I think your issue is rear suspension setup. I've had Nankang tyres on a previous car and they were excellent, very grippy in the dry and wet.

No issues before the new tyres.

Easily clocked 200 on any road with old tyres....

lets see how it goes on wednesday.

 

[DieselFan]

You paid to keep your own tyres... what a joke. I would have lost my shit.

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[Deon Rupnarain]

You paid to keep your own tyres... what a joke. I would have lost my shit.

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Ya its balls , R70 a tyre too.

They say its some new rule in place , same thing happened at their sister company when i replaced 15inch tyres about a month back ..

 

[DieselFan]

Why are you still using this company?

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[Deon Rupnarain]

Why are you still using this company?

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Yes i know bud , it was my first and last time.

Quakity comes at a price!!!

 

[Carbon]

Shame , i made the wife go check the tyre sizes again...i need to edit the original postraise:

Back 255/40/17
Front 225/45/17

I hope the above sizes are correct.

WRT JacksTyres , I clearly remember the guy adjusting the Rear cambers and i found printout but forgot to bring to work today:sorry:

Thanks for the response "X3" . My car will be all over the place if i go on the road at even 100kph.
From what i gather the alignment and the new NON RUNFLATS are the issue, Guess what i forgot to mention ...i paid to keep my original RunFlats which has about 60% life.......

Lets see how it goes on wednesday with BMW.

Thanks alot guys!!!:ty:

It's not the tyres. They may be on the budget side but it still wont cause your problems. Also, run-flat tyres have worse road handling than regular tyres, don't go back if you aren't worried about punctures.

There are two main causes for unpredictable oversteer, one is mismatched tyre pressures, but the differences have to be extreme, more than 1.5 bar difference.

The other is toe out rear. Less Camber would lessen grip, but more predictably and with fair warning. Toe out (instead of in) would cause snap oversteer and the DSC would freak out.

Check tyre pressures today (2.2 bar all round is a fair start) , and also, don't go to BMW to fix alignment, they would tell you that its the tyres (happened to me). Go to a Hi-Q or similar with a hunter laser alignment machine. It has the car's specs loaded on the system so the operator has no thinking to do. They also charge about R350 for alignment.

 

[Deon Rupnarain]

Shame , i made the wife go check the tyre sizes again...i need to edit the original postraise:

Back 255/40/17
Front 225/45/17

I hope the above sizes are correct.

WRT JacksTyres , I clearly remember the guy adjusting the Rear cambers and i found printout but forgot to bring to work today:sorry:

Thanks for the response "X3" . My car will be all over the place if i go on the road at even 100kph.
From what i gather the alignment and the new NON RUNFLATS are the issue, Guess what i forgot to mention ...i paid to keep my original RunFlats which has about 60% life.......

Lets see how it goes on wednesday with BMW.

Thanks alot guys!!!:ty:

It's not the tyres. They may be on the budget side but it still wont cause your problems. Also, run-flat tyres have worse road handling than regular tyres, don't go back if you aren't worried about punctures.

There are two main causes for unpredictable oversteer, one is mismatched tyre pressures, but the differences have to be extreme, more than 1.5 bar difference.

The other is toe out rear. Less Camber would lessen grip, but more predictably and with fair warning. Toe out (instead of in) would cause snap oversteer and the DSC would freak out.

Check tyre pressures today (2.2 bar all round is a fair start) , and also, don't go to BMW to fix alignment, they would tell you that its the tyres (happened to me). Go to a Hi-Q or similar with a hunter laser alignment machine. It has the car's specs loaded on the system so the operator has no thinking to do. They also charge about R350 for alignment.

Thanks , I learn everyday with the input from this forum much appreciated!!!! I sort the Tyre pressure out this afternoon .

I worried that by going to Hi-Q or Ashwin that after money spent it still wont be correct . I hate going back and forth only to realise what i should of done in the first place. At least i am getting free diagnostics one time....lol.

 

[AadZO]

I'm also on Non RFT now and never had an issue. Really doubt it's the tyres bru ...
Wait, you had to PAY for your own used tyres and you still think it could be the tyres ? Haibo
:crazylaugh:
Go do alignment, properly - let us know

Something to think about as well - Non RFT's are lighter than RFT's, so in theory, could they light up easier given similar compound and pressure ? Then again, usually softer, so in theory they should stick more ?
Just a question ...

 

[Carbon]

Something to think about as well - Non RFT's are lighter than RFT's, so in theory, could they light up easier given similar compound and pressure ? Then again, usually softer, so in theory they should stick more ?
Just a question ...

Weight has a negligible effect on grip on a smooth road and normal driving conditions. It does affect acceleration mostly due to increased inertia.

The main reason for increased grip with non-rft tyres is the reduction in unsprung mass causing the suspension to work better, that and a softer sidewall conforms to uneven surfaces better.

 

[Deon Rupnarain]

i speak engrish....lol.

well the only input i can add now , just by driving on str8 roads , is that the car is alot smoother/softer and doesnt feel like a golf1 with heated springs....hahahah.

 

[sash]

the issue about the old tyres has become a norm, most places dont advertise that their prices include your old tyres as they normal sell them off to the next person,

 

[Deon Rupnarain]

the issue about the old tyres has become a norm, most places dont advertise that their prices include your old tyres as they normal sell them off to the next person,

agreed , after i queried: they say they balance and align for free in return for the tyres...

but faaar**** my rims didnt need balancing and sure as hell didnt need alignment etc etc ....

 

[Rayzor]

[/quote]

Thanks , I learn everyday with the input from this forum much appreciated!!!! I sort the Tyre pressure out this afternoon .

I worried that by going to Hi-Q or Ashwin that after money spent it still wont be correct . I hate going back and forth only to realise what i should of done in the first place. At least i am getting free diagnostics one time....lol.
[/quote]

I try to get my balancing and alignment done after every 20k km, I dont get charged if my alignment is correct. Just make them aware of you situation before you make a booking :coolShake:

 

[WIDEOPN-X5]

Shame , i made the wife go check the tyre sizes again...i need to edit the original postraise:

Back 255/40/17
Front 225/45/17

I hope the above sizes are correct.

WRT JacksTyres , I clearly remember the guy adjusting the Rear cambers and i found printout but forgot to bring to work today:sorry:

Thanks for the response "X3" . My car will be all over the place if i go on the road at even 100kph.
From what i gather the alignment and the new NON RUNFLATS are the issue, Guess what i forgot to mention ...i paid to keep my original RunFlats which has about 60% life.......

Lets see how it goes on wednesday with BMW.

Thanks alot guys!!!:ty:

It's not the tyres. They may be on the budget side but it still wont cause your problems. Also, run-flat tyres have worse road handling than regular tyres, don't go back if you aren't worried about punctures.

There are two main causes for unpredictable oversteer, one is mismatched tyre pressures, but the differences have to be extreme, more than 1.5 bar difference.

The other is toe out rear. Less Camber would lessen grip, but more predictably and with fair warning. Toe out (instead of in) would cause snap oversteer and the DSC would freak out.

Check tyre pressures today (2.2 bar all round is a fair start) , and also, don't go to BMW to fix alignment, they would tell you that its the tyres (happened to me). Go to a Hi-Q or similar with a hunter laser alignment machine. It has the car's specs loaded on the system so the operator has no thinking to do. They also charge about R350 for alignment.

I refer to the parts bold / underlined

Not sure i agree entirely with the handling hypothesis. There is significantly less sidewall deflection in a runflat tyre so the turn in characteristics of a runflat and normal tyre of same sizes on the front of a car would see the runflat with a "crisper" turn in and theoretically hold the line with few corrections than a normal tyre. Don't forget that the BMW suspension is also set up around runflat tyres which I assure you exhibit different characteristics.

Lets not confuse camber and toe.

Tyre pressures are extremely important. BMW recommended tyre pressures will see you get maximum 20k km out of the front tyres before they are worn to canvas on the shoulders.

I ran 2.8bar front and 2.6bar rear on my 320d and got 35k km out of the tyres with even wear across the surface. The same applies to my X3 and Tyre Mart Pinetown has the data logged. They were very surprised but the proof is there.

Yes the ride is somewhat harsher but at R15k per set for my X3, I will put up with the harshness to get 50k km out of a set of tyres.

If I could be so bold, don't let a BMW dealership loose on your alignment; they messed mine up and I paid the price. You're in Durban, go see Paul at TyreMart Crompton Street and they will get you car sorted.:coolShake:

 

[Carbon]

I refer to the parts bold / underlined

Not sure i agree entirely with the handling hypothesis. There is significantly less sidewall deflection in a runflat tyre so the turn in characteristics of a runflat and normal tyre of same sizes on the front of a car would see the runflat with a "crisper" turn in and theoretically hold the line with few corrections than a normal tyre. Don't forget that the BMW suspension is also set up around runflat tyres which I assure you exhibit different characteristics.

Tested proof. Same car and same tyres, rft vs non rft. Non-Rft wins every single test by quite a significant margin. I do agree that stiff sidewalls can inprove turn-in though, but there are better tyres for that. See test below.
RFT vs Non-RFT Tyre test.

Lets not confuse camber and toe.

I was refering to the differences in handling characteristics between the two, hence the period in the underlined section.

Tyre pressures are extremely important. BMW recommended tyre pressures will see you get maximum 20k km out of the front tyres before they are worn to canvas on the shoulders.

I ran 2.8bar front and 2.6bar rear on my 320d and got 35k km out of the tyres with even wear across the surface. The same applies to my X3 and Tyre Mart Pinetown has the data logged. They were very surprised but the proof is there.

Yes the ride is somewhat harsher but at R15k per set for my X3, I will put up with the harshness to get 50k km out of a set of tyres.

Tyre pressures are important. RFT tyres require much higher pressures than regular Non-RFT tyres as there is a higher torsional force on the tread edge causing so-called "camber-wear".[/color]

See my response in red.

 

[WIDEOPN-X5]

I refer to the parts bold / underlined

Not sure i agree entirely with the handling hypothesis. There is significantly less sidewall deflection in a runflat tyre so the turn in characteristics of a runflat and normal tyre of same sizes on the front of a car would see the runflat with a "crisper" turn in and theoretically hold the line with few corrections than a normal tyre. Don't forget that the BMW suspension is also set up around runflat tyres which I assure you exhibit different characteristics.

Tested proof. Same car and same tyres, rft vs non rft. Non-Rft wins every single test by quite a significant margin. I do agree that stiff sidewalls can inprove turn-in though, but there are better tyres for that. See test below.
RFT vs Non-RFT Tyre test.

Lets not confuse camber and toe.

I was refering to the differences in handling characteristics between the two, hence the period in the underlined section.

Tyre pressures are extremely important. BMW recommended tyre pressures will see you get maximum 20k km out of the front tyres before they are worn to canvas on the shoulders.

I ran 2.8bar front and 2.6bar rear on my 320d and got 35k km out of the tyres with even wear across the surface. The same applies to my X3 and Tyre Mart Pinetown has the data logged. They were very surprised but the proof is there.

Yes the ride is somewhat harsher but at R15k per set for my X3, I will put up with the harshness to get 50k km out of a set of tyres.

Tyre pressures are important. RFT tyres require much higher pressures than regular Non-RFT tyres as there is a higher torsional force on the tread edge causing so-called "camber-wear".[/color]

See my response in red.

:coolShake:

 

[Deon Rupnarain]

Guys

So what should be the correct tyre pressure now ?

---

so here's a little quickie ....


front tyre pressure 1.8bar
back tyre pressure 2.2bar

I have adjusted all to 2.4bars and can't tell a difference just yet . I am way to far away from the roads that have given me the problem or the speeds since traffic is quite bad atm[CRYING FACE]

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[Lizzard]

Well I will tell you what I do on my car.

Front: 225x45x18"
Rear: 255x40x18"

Pump my front to 2.4bar and rear to 2.8bar, not sure on 17" what it should be.