Traction loss with 245/40/17 MPSS

[twag4]

Originally Posted by why?

Yea summer tires that wide probably are nor going to be able to get warm enough to handle really well even in 60 degree weather. There are people who race on the 245's and say sometimes they cannot warm tires that size up.



because the rest of the world always uses the arbitrary metric system, oh wait, no they don't. Brits use a gallon that is a different size than our gallon. Oh wait, they use stone for weight. I could go on. The US system was based on actual use and what was done for centuries, the metric system was randomly created and made up.

Don't forget that we also got to keep our identity as the Germans never kicked our ass in war- not once or even twice. But hey, thanks for the waffles with the big squares, they're tasty!

But I have to agree with @projectXTR, the metric system is much easier and much more intuitive!

[Nevermore]

This thread is making me rethink my desire to get 245/40/17 when I get my summer wheels. Even when it's above 60 degrees here during the day, it's rarely that warm when I leave for work. There's probably only a two-three month period in the year where I'd be able to use these tires if they're no good below 60 degrees.

[hamlet]

this thread actually brings up some great points about the reality of wider tires and that they aren't necessarily better for street performance (maybe worse in a lot of cases).

There's a tendency to set up our street cars like they're track cars when a lot of guys dont actually drive on the track very often. It's nice when a little bit of education comes around, but ignorance is king.

[icybrzzz]

^ Yes lots of good points brought up in this thread. I'd like to thank everyone for chiming in and teaching me a thing or two about tire setups.

The first thing I thought when I actually tried out the tires was "did I ruin the balance of the car?". I'll have to wait for warmer temps to see as I'm putting the winters on shortly.

Might have to go back to 215/45/17 if that is the case.

I do plan on getting some RCE yellow's and a rear strut bar next spring so we shall see what happens

[jawn]

Originally Posted by hamlet

this thread actually brings up some great points about the reality of wider tires and that they aren't necessarily better for street performance (maybe worse in a lot of cases).

There's a tendency to set up our street cars like they're track cars when a lot of guys dont actually drive on the track very often. It's nice when a little bit of education comes around, but ignorance is king.

Yeah. For a street car with ~200HP, 215s or 225s with good compound are probably enough for most folks.

[churchx]

Maybe even 205, as imho eg. MPSS of 205 will still be slightly grippier then stock primacies of 215. Also 205 was stock tire width for 16" options of lower FT86 trims.

[why?]

Also it is good to look at tire cost, because these summer tires do not last that long, so you are going to replace them more. And 245 are at minimum $30 more a tire, and even 225 tires can be more expensive.

And weight is worth thinking about too. Wider tires and the wheels for them weigh more, and for daily driving that can hurt not just performance but also handling and gas mileage.

[SoCalArgento]

Interesting, I have the same exact tire and wheel spec except different brand wheels and mine handles amazing well; much more grip than stock primacys. However I did get coilovers and running camber front and slight in back. Also lowest temps I've driven in were around 65F here in SoCal.
In regards to mileage and wear I can attest that mileage has gone down for me however slight and of course tire wear will occur much quicker.

I haven't had a chance to AutoX or track yet with the new setup.

P. S this is my first true sports car so I'm still learning the ways about tuning/car handling characteristics with the help of this community.

Hope you get your setup to your liking👌🏽


Sent from my iPhone using Tapatalk

[Timmy_Jones]

I have ultra high performance summer tires and even when the temps are 40-50F here I have tons more grip than the stockers (225 Front/255 Rear). I am stumped by this one.

[df.dima]

I watched this over a few days before posting, I run exact same tire as you, they have about 2k on the, and Im just an hour away from you, so we have pretty much the same weather.
I do notice a difference in grip between say early crispy morning at 5C after cold night, vs during the day at 15C, that is pretty much given. But not to the point that I can't take normal turn due to slipping. This morning was about 10C, cold tires, 2nd gear, about 35km/h, mid turn I was able to get some tc action, mostly because I induced it myself (yank the wheel and play with gas). At about 15C or above, I feel MPSS have noticeably more grip than stockers. Below that it does drop down.

[Campo]

FWIW I track and daily my car on two different sets of rims and tires because they're meant for different things.

Street - 255/30-19 +45 square Pirelli PZero Nero GT
Because they look awesome

Track - 225/45-17 +45 square MPSS
Because they drive awesome after a couple laps

You would think that a naturally aspirated car couldn't break those 255s loose, but since I can barely get them up to temperature even here in Phoenix, I can slide them sideways all day long. TC is never turned on in the car.


Tapatalk - because smoke signals would be too easy.

[mav1178]

Originally Posted by icybrzzz

3. The tires are far too worn out.

I'm assuming you traded for a set of used tires?

You may have tires that are heat cycled out or otherwise beyond normal/advertised usable grip due to neglect by previous owner.

-alex