What's the worst case scenario for running the same size tire all around?
 

I know that the stock Z setup has a staggered set up 235 50 17 in the rear and 225 50 17 up front, and with varying degrees for the 18 inch and 19 inch stock wheel versions. Will I do damage to the car running 245 45 17 all around?

F up VDC and you will "slip" all over and more prone to oversteer ..

i know ABS will kick in on the track when hard braking....it will think that the wheels are sliding

The car could become dangerously uncontrolable at speed, and you could die.

Sport Compact Car ran the same size tire on all 4 corners on an 18x9.5 rim. I think they were 265/45/18 at all four corners and that helped them achieve over 1g handling. I plan on running 245/45wr17 on my stock Enthusiast rims and dont have any worries.....i think you would be fine other than it messing with VDC if you have it..........

You will get an intermittent SLIP at about 40 mph. At about 70 mph, you will get a constant SLIP. TCS will recognize a serous problem, and shut down the car. Pull to the side of the road, wait 60 seconds, start the car.

When this was last asked on several boards, the consensus was that the VDC didn't like it, and neither did the TCS. However - the results were not the same for everyone; some reported big issues, others said no problems. There is some risk, no question. But I don't really think that your car will stall on the freeway because of it...... :eek:

BTW, the Sport Compact Car article stated their didn't have VDC, and it would have been no problem for them to turn off the TCS during their limited testing. The article was about getting 1.0 g on the skidpad, not about real world driveability.

There are threads where I often make humorous comments, but not to questions which are safety related. Messing with TCS can have serious consequences. See: http://350zforum.com/net/viewmsg.asp...al&msg_id=6981.

At worst you will need to turn off VDC because it will apply brakes for you going around corners slow thinking your slipping-I have experienced this and it sucks, its so obtrusive it can actually take you out of your line. So if you can live with driving with VDC off, then go for it.

You are correct, I forgot about that. I ALWAYS drive with TCS off so I shouldn't have any problems but I guess with VDC and TCS it could play a factor in messing with those two.

I understand why it would mess with VDC but I don't really understand why it would mess with TCS? Can someone explain just so I know for future reference?

Thanks...

Exactly, TCS/VDC off and the ABS will still messed up your braking...

I am running 35 series on 19's all around and my vdc jams up right before i start out of first. once i turn it off i have no problems

:icon18: +1 worst case scenario.

Stating your profile without the cross section is pointless.

TCS uses the speed of the front wheels and compares it to the speed of the rear wheels to decide if the tires are spinning. Normally, with the stock diameter stagger, the rear hubs are turning slower than the front hubs when the car is going a steady speed in a straight line. The more speed increases the larger the difference. The computer expects this when it calculates "slip".

Now lets say you have put four equal size tires on, in that same straight line, all four hubs are turning the same speed. The faster you go, the computer still expects to see a growing difference but it does not. This is why high speeds can cause SLIP to come on solid. The computer thinks the back are slipping because they are going faster than they should compared to the front tires.

In cornering, the inside tires spin slower than the outside tires because of the greater distance they travel in the same corner, so if the computer is comparing the inside front to the outside rear, it would see an even great difference and that might cause the SLIP to come on at lower speed than it would in a straight line.

Chris

I have no issuses , just have to turn the TCS off or it slips easy.I can rotate my tires too:)

How come nobody's telling the truth about ABS which will kicks in while braking at high speed... :icon9:

I have never had ABS problem braking at high speeds, but TCS HAS to be turned off or it will kick in at anytime you punch it.

I Have 245/35/19 In Te Front And 275/35/19 In The Rear.... Is That Bad

guys you're blowing this out of proportion

i have performance winters on my Z right now, same size all around... when the weather was nicer up here and the roads were dry, I was driving at close to 100 mph on the freeway with no problems at all (w rated winters)... this is WITH VDC ON and NO SLIP whatsoever

VDC needs a whole lot more than 1 or 2 extra revolutions every 10 seconds to detect a loss of control situation under street driving conditions

but if the poster is only interested in daily drivability and plans on turning VDC off @ the track, then there's no problem whatsoever imo

I've had the occasional slip light come on at 40mph as mentioned above. But at the time I was running 245 45 17 in the rear and 225 50 17 in the front.

Has anyone else running same size tire all around had that stall at 70mph that was mentioned?

I'd like to be able to rotate my tires, that's pretty much why I asked.

Thanks