370z MEATY TIRE THREAD

[RBfastback]

looks really good man, maybe next time.
I went with 295/35

[cjwsrt6]

Can someone enlighten me on the tire height debate? I have a set of 285/35/19 kumho xs fronts under my house and want 305/30/19 kumho v720's but I am not knowledgeable enough to know if these heights will mess with the sensors, I'm not worried about the speedometer but more along the line the difference in height messing with the traction control or stability sensors

[370zHawaii]

Seems fine to me, but I am no expert by any means. Traction is on point with this setup

[RBfastback]

btw everyone should read this, this is what I've been talking about with wide tires not being the best options aside from sexy looks. TALLER and tire compound= more traction.

the pss 335/30/19 is pretty tall tho but also adds ALOT of outer wheel edge rotational wheel weight/mass!!!

so many variables

off another forum:
tire physics

Mechanisms of Tire grip. Friction Mechanical Keying Adhesion As they are made from deformable rubber, tires dont exactly follow basic friction theory. So to just say that F=mu*r is strictly wrong. Although it basically does floow this during the elastic range. Tires only give grip when they are at the correct temperature. this is the most important thing you can remember about tires . Now on to business. Tires are the most important part of the suspension, either they are designed to fit it, or the suspension is designed around the tire. People who say wider tires make more grip because ;''there is more rubber on the road' are wrong. They are both wrong that it makes mroe grip and that there is more rubber on the road. When you make a tire wider, you alter the contact patch to be wider , but it reduces in length. So depending on sidewall stiffness, a wider tire can actually give less rubber on the road. The main reason for tires being the size they are is actually heat management. Wider, low sidewall tires will cool better than narrow tall tires. If you can;'t get a tire up to temperatie it will give no grip, if you get it too high you will cook the rubber and ruin the set of tires. Back to contact patch, you can safely assume that contact patch stays roughly the same area with wide or narrow tires (as long as the load stsys the same). Narrow will have longer contact patches and wide tires will have shorter. The reason why F1 tires are wide is primarily so that they dont cook (remember they arent just wide, they are fairly high sidewalled), but they ten to have wider contact patches because they will give better grip going round corners. A wide tire will generate more lateral force per slip angle making cornering better. F1 cars DO NOT have wide tires for linear acceleration. Conversely drag racers acutally use the tires not becuase of the width, but the tallness. As we know a wider contact patch gives better cornering performance, a narrow but long contact patch is what you want for linear acceleration. so strangely, drag racers will actually be better with narrow tires. So why do they use wide tires? (remember the most important grip aspect of tires) Temperature! They want as longer contact patch as they can get, but need the width for cooling. (with 4000+ horsepower you do kind of build temp rather well) But if you look at the contact patch shape between say, an F1 car or drag racer. (both are considered to use wide tires). The F1 patch will be wider and shorter for good cornering, the drag patch will be longer and narrower (relatively) for good linear acceleration. So to sum up: Wider tires are not always better. They dont always give better traction. It depends on the car, the situation, the conditions. Eg. Rally cars use wider tires when on tarmac rallys, and use (surprisingly) very thin tires on ice rallys. F1 cars used to use narrow tires until aero began to be used in the 60's. Drag racers acutally want tall tires, width is there to stop the tire being destroyed. TEMPERATURE!!!!!! rawr. As example I can think of is formula student cars, they used to use 8inch tires but couldnt get them up to temperature. They switched to 6.5inch and got more grip because they can get them up to temp. holy beep thats the longest post i've ever done. I should do a summary.

Reference https://www.physicsforums.com/thread...debate.330790/

[jchammond]

Statement by RBfastback is True; at the strip,a narrower tire w/more sidewall will bite better....more psi on the tire. & look how fast cars are going on 275's.
My reasoning for going wider,would be strictly for looks & on the street....but at the track-everyone has their own little details (not necessarily published) to help them along.
Example.....My ~Z~ went 1.95 in 60' w/275 all weather tires on 18's w/open diff 3.359 gearing......
some will say WTF....but planning to go 1.60's this spring N/A
Good Imfo RB!

[Rusty]

Nice write up. But it belongs on another thread. This is the "Meaty Tire Thread!" And is for fans of fat tires. So......

Oh... by the way. Indy cars and F1 cars was running fat tires before aero in the '60's. They was on bias ply tires, not radials. They didn't have the technology then, like we have today. Plus the rules limit on what you can do with tires too.

On dragsters. One reason the slicks grow in height when spun. Is to change tire height so that it changes the overall gear ratio. The rules limit the gear ratio to 3.09 in the rear end. So the get the speed at the end of the quarter mile the tire grows from 36" to about 45". The tires are 36x17.5-16 with about 8 different compounds. If the tire didn't grow. You wouldn't see trap speeds in the 300's.

And remember. Rules dictate on what you can do and can't do, and level the playing field.

[Spooler]

WOW, you wrote why I needed wider tires. Heat management. Go to the Dragon and see how much slip you have toward the end of the run.

[FPenvy]

Originally Posted by Spooler

WOW, you wrote why I needed wider tires. Heat management. Go to the Dragon and see how much slip you have toward the end of the run.

end of the dragon i have tons of grip lol


now when i leave fontana and go balls out that first turn into hell bender is sideways lol

[Spooler]

Originally Posted by FPenvy

end of the dragon i have tons of grip lol


now when i leave fontana and go balls out that first turn into hell bender is sideways lol

That's because your car is slow, it is an automatic.

[FPenvy]

Originally Posted by Spooler

That's because your car is slow, it is an automatic.

oh god another manual homo

[Spooler]

Automatic Hater, Hater bud.....

[FPenvy]

Originally Posted by Spooler

Automatic Hater, Hater bud.....

first one sounds more appropriate

[Rusty]

He doesn't have enough coordination to use the 3rd pedal.

[FPenvy]

Originally Posted by Rusty

He doesn't have enough coordination to use the 3rd pedal.

i gotta make a note to do a nice burn out at 3am by wherever you're staying at zdayz lol

[edzilla123]

Has anyone done a 19x12 +20 set up yet, id like to run 335 square with my aimgain flairs