will 265/35/19 305/30/19 setup have DSC/MDM issue at 100+ mph?

[tonywham]

Want to try mps4s with 265/35/19 305/30/19 setup, but still can't pull the trigger due to dsc concern. Did anyone with this setup have the dsc issue at any speed, even at 100+?

[Harveyd396]

I have RE71R's in that size, a very slight dsc intervention only at full throttle at high speed. Happens for just a second rowing thru the gears, may be perfectly normal and warranted. I normally hit the dsc button when starting up and use only euro mdm on dry pavement. Then there is no intervention after preventing wheelspin in 1st gear. BTW, not lowered, stock 19' wheels, no spacers, handles great, perfect tire sizes.

[4everkidd]

Originally Posted by tonywham

Want to try mps4s with 265/35/19 305/30/19 setup, but still can't pull the trigger due to dsc concern. Did anyone with this setup have the dsc issue at any speed, even at 100+?

Exactly what I'm rolling with in Michelin's... haven't had any issues as of yet

[tonywham]

Thanks Guys....glad to know...thought there would be crazy DSC interventions since the front and rear rolling diameters are almost the same...Now this setup looks the best

[JamesGames]

The DSC intervention w/ that size is pretty noticeable to me. Here's an example, I've ran 3 sets of wheels / tire combos so far..

1) OEM 513M 255/40/18 275/40/18
2) BBS LMR 255/30/20 275/30/20
3) TE37 265/35/19 305/30/19

The 265 / 305 had the most DSC intervention even in MDM mode. Even 3/4 throttle in 3rd gear lights up the DSC lights, which never happened in the other two setups. It's gotten to the point where I'm annoyed of the power cuts and just turn off DSC when I run the 265/305 setup, especially since they are running grippy RE71Rs. YMMV.

For what it's worth I always thought this version of the ///M cars had the most sensitive DSC/MDM modes and I feel the car "predicts" when traction is about to be loss before there is any slip. I don't see how anyone can drive this car on the track w/ MDM mode on and square setup..

[tonywham]

Originally Posted by JamesGames

The DSC intervention w/ that size is pretty noticeable to me. Here's an example, I've ran 3 sets of wheels / tire combos so far..

1) OEM 513M 255/40/18 275/40/18
2) BBS LMR 255/30/20 275/30/20
3) TE37 265/35/19 305/30/19

The 265 / 305 had the most DSC intervention even in MDM mode. Even 3/4 throttle in 3rd gear lights up the DSC lights, which never happened in the other two setups. It's gotten to the point where I'm annoyed of the power cuts and just turn off DSC when I run the 265/305 setup, especially since they are running grippy RE71Rs. YMMV.

For what it's worth I always thought this version of the ///M cars had the most sensitive DSC/MDM modes and I feel the car "predicts" when traction is about to be loss before there is any slip. I don't see how anyone can drive this car on the track w/ MDM mode on and square setup..

my current stock zcp setup (265/30/20, 285/30/20) will throw in the DSC lights at 3/4 throttle in 3rd gear, I thought it was normal, but now it just amazed me that it was never happened in your other two setups

[JamesGames]

Originally Posted by tonywham

my current stock zcp setup (265/30/20, 285/30/20) will throw in the DSC lights at 3/4 throttle in 3rd gear, I thought it was normal, but now it just amazed me that it was never happened in your other two setups

I'm 6MT, So it never occurred in 3rd with previous setups unless I was on surface that was bumpy or going WOT on those surfaces. DCT has shorter gears and no lag in-between shifts so lighting up 3rd gear on DCT is easier. Hell I could even put WOT down on a nice road in 2nd gear without DSC lighting up sometimes. In 3rd was rare, and even less so with the 265/305 setup. The difference now is I noticeable in 3rd gear upon heavy throttle.

[tonywham]

Originally Posted by JamesGames

I'm 6MT, So it never occurred in 3rd with previous setups unless I was on surface that was bumpy or going WOT on those surfaces. DCT has shorter gears and no lag in-between shifts so lighting up 3rd gear on DCT is easier. Hell I could even put WOT down on a nice road in 2nd gear without DSC lighting up sometimes. In 3rd was rare, and even less so with the 265/305 setup. The difference now is I noticeable in 3rd gear upon heavy throttle.

gotcha...

[mercedesc63]

Originally Posted by tonywham

Want to try mps4s with 265/35/19 305/30/19 setup, but still can't pull the trigger due to dsc concern. Did anyone with this setup have the dsc issue at any speed, even at 100+?

There is only slight intervention above 100mph.. It also throws off the speedo.

I had a 265/35 and 305/30 on RE11s on VMR 810s.

PS4S 305/30 should be the latest and greatest in terms of ride quality and performance.

[G1n Mast3r]

mercedesc63 about by how much does it throw off the speedo? Curious as this is the exact setup I am looking at running when I finally get around to putting wheels one the car.

[mercedesc63]

Originally Posted by G1n Mast3r

mercedesc63 about by how much does it throw off the speedo? Curious as this is the exact setup I am looking at running when I finally get around to putting wheels one the car.

It was like at least 5mph off but it had the capability to be correct sometimes..

[applesauce683]

I have run this same setup for over 10,000 miles, mostly with AD08R's and most recently with PS4S. I am not sure why anyone would need to have DSC/MDM on with this setup especially at stock power levels. I am running BM3 stage 2 and it is totally manageable and easy to modulate with DSC completely off. Speedometer is a consistent 3mph faster than actual speed, verified by GPS.

Side note: If with this setup someone doesn't feel comfortable with leaving DSC/MDM off, they definitely need some sort of high performance driver training.

[mercedesc63]

Originally Posted by applesauce683

I have run this same setup for over 10,000 miles, mostly with AD08R's and most recently with PS4S. I am not sure why anyone would need to have DSC/MDM on with this setup especially at stock power levels. I am running BM3 stage 2 and it is totally manageable and easy to modulate with DSC completely off. Speedometer is a consistent 3mph faster than actual speed, verified by GPS.

Side note: If with this setup someone doesn't feel comfortable with leaving DSC/MDM off, they definitely need some sort of high performance driver training.

I am going to have to disagree on this..

I personally highly recommend MDM stay on and DSC never be turned off. If necessary upgrade to Euro MDM.

Even experts drive with DSC activated it helps even when the light isn't flashing.

[applesauce683]

Originally Posted by mercedesc63

I am going to have to disagree on this..

I personally highly recommend MDM stay on and DSC never be turned off. If necessary upgrade to Euro MDM.

Even experts drive with DSC activated it helps even when the light isn't flashing.

Driving 10/10's on the track, yeah maybe having MDM on is a good idea, but for street driving where you shouldn't be driving at the limit anyways, I don't see the need for MDM being on. It just cuts out the fun.

[kyleb350]

Looked up the actual numbers as I thought there were some overreactions. Here are the overall diameters of the PS 4S tires in 19" sizes.

255/35/19 - 26"
275/35/19 - 26.6" (2.3% larger than front tire)

265/35/19 - 26.3" (1.1% larger than stock front size)
305/30/19 - 26.3" (1.1% smaller than stock rear size, 0% with this front size)

You're going from a 2.3% delta to a 0% delta between the front and rear tire rotation speeds. The speedometer is also only going to read 1.1% faster. These differences shouldn't be noticeable in my opinion.

[Sonic_M2c]

Does anyone know how will 265/35/19 and 295/30/19 perform when in Euro MDM?

[mercedesc63]

Originally Posted by Levi

Does anyone know how will 265/35/19 and 295/30/19 perform when in Euro MDM?

255/35/19 stock and 295/30/19 or 265/35/19 front and 305/30/19 would be the ideal combo... both work really well with euro/gts MDM and even regular MDM.

[Sonic_M2c]

Originally Posted by mercedesc63

255/35/19 stock and 295/30/19 or 265/35/19 front and 305/30/19 would be the ideal combo... both work really well with euro/gts MDM and even regular MDM.

Thanks man!