I have 205/50/15 toyo T1-S tires
does anyone that has these tires know a good pressure for street use
i had them at like 34psi and they were very hard on the road and i could feel everything
i want a correct psi front and rear which i will get good city daily driving and like good tire wear and mileage

i have all 4 set on 30psi right now, i think they are too soft or something
can ANYONE HELP me and tell me a good pressure to try out

thanks guys

 

30 is too low for the street - handling will suck and you get lower mileage due to the increased rolling resistance.

34-36F/ 32-34 R is about right.

Autocrossers use as much as 42 in the front btw.

And just what is wrong with feeling everything in the road - that's what the car is supposed to do. If that bothers you go to a higher profile tire on a smaller rim.

 

Pretty much what BPR said!

 

ditto, what they said

I run 37F/35R

 

I run 205/50r15 Azenis at 45f/40r for autox and 195/55r15 Eagle F1s at 32 for street.

 

tjhanks BPR

yeah i need to change to a prelude or something
i'm a sushi driver
nice and smooth, the ride isnt' bad, just like it was far worse for some reason over the re010s
ok pressure is up to 34 is FRONT and 32 in REAR
why is rear always lower?

 

Rear is kept lower on the streets to reduce the car's oversteering abilities and help keep things safe for inexperienced drivers.

 

RE-010's are 195/<u>55</u>/15, so it'll be a bit more cushioned than 205/50/15. ~5% difference in side-wall ratio makes quite a bit of difference. That's one reason why I would never put other tires for street driving on the R... RE-010's rule!

As for the tire pressures: Rear doesn't have to be lower than the front... but, a national autoX competitor once told me that in our FWD cars, we get steering/throttle feedbacks from the front tires. Hence, having stiffer (more feedback) front tires provides the necessary feedback for the driver. If you firm up the rears more, then you'll get the feedback from the rear tires (believe it or not)... but we do not have any control over the rear tires (no throttle, no steering), so down go the rear tire pressure. He (Ken Rupp) recommends doing ~max psi fronts/ ~max psi - 1-2 psi rears on <u>street tires</u> for <u>autoX</u>, and it surely works for me!

[edit] Should only use ~max psi on autoX only... [edit]


[Modified by Cosworth, 9:05 AM 9/1/2002]

 

what is the T1-s MAXIMUM anyone know for 205 50 15 size tires?

 

then why is it autocrosser lower rear tire pressure to induce oversteer? . . . . .And yes it does work I have been auto-xing for 4 years and this is a common method.

 

I have to agree with you on the RE010's and street use, I'm on my second set.

I have messed around Soo much with my pressures in the past eventually thinking that 37F and 35-36R would work the best but, after quite some more time I have settled with simply 35F 35R and feel strongly that the car feels the most nimble this way, NOT too much roll in the front NOT too much scary rotation in the rear, "but, I like the rear rotation."

I haven't been on stock tires at an AutoX in quite a while But, remember vividly finding Great success on a tighter course with 40F and 45-48R, Remember that it was a tight course and I like the rear rotation. R compound tires are a Totally different story.

Although I understand what you are saying about steering/throttle Feedback, I think it is better to label this as "Steering Response" and the throttle as "Traction issues." There is always a fine line between the perfect traction, response and rollover at the sidewalls. It is alot more evident at autocross and not nearly as clear on the open road. I know you understand what I am saying Cosworth, I am just trying to make my point as clearly as possible.

Road= the pressures that BPR mentioned.
Track= raise both ends by 2-3 PSI evenly at first and see how the car handles then adjust accordingly.

Ultimately though R compounds will be a future choice and a different animal altoghether.

Good luck,

A.

 

Traction can be lost at any pressure that is not optimal. If the pressure is lower OR higher than optimal traction will be lost. Therefore, you can set the rear pressures higher or lower than front and oversteer will commence.

BUT,

lower or higher pressures have a different feel. When higher than optimal, the rear tires almost 'dance'. Sort of a feeling of being on ice. When lower than optimal, you grip then break loose.

Therefore,

Everything depends on driver style. I like the "dancing" rear tires. To me, it is predictable. I tried both sides of the coin, lower and higher, but I prefer higher.


[Modified by davidnyc, 9:12 AM 9/1/2002]

 

For FF or FR cars?


As a basic rule for a Stock R, RAISING the REAR pressure will induce Oversteer.

A.

 

And we didn't even get into temperatures and tire compound hardnesses.

HEY,,, You don't Even check your pressures!!!


A.

PS you registered for the 11th? I am.......

 

FF cars.

Not true as outlined by Davidnyc. I have tried it both ways as well and find lower to be more controllable. ALl in preference but I have also noted that the majority lower instead of raise (At least in my region and division).

Notice loweing will create the sidewall to roll over and allow for slip.

Also I think that the pressure suggestions so far have been too high for street. I run 38/36 at auto-x for my Azenis. I typically stay around 33-34 psi on the streets. High pressure will cause center tire wear.

 

I'm very curious how Dave is going to answer this.

I know he has ALOT more experience than I, and will clarify everything when he responds. But, I have not yet seen anyone Lower the rear pressures at an X to allow for more oversteer.

Street pressures are preference depending on the level of required performance and or comfort. To each his own but, I stand by the 35F35R for me.

A.

 

Most pro's in our region suggest lowering pressures in the rear on FF cars. It seemed odd to me at first. So for the beginning of the season, I tried it. It does induce oversteer, but just feels different. So, I went back to my old style of increasing pressures.

Here is an experiment. Deflate the rear of your bicycle tire to about 20psi. Ride the bike and turn. The back will wash out on a turn. Oversteer. Same principle.

Also, I run 35psi on Falken Azensis for my ITR 205/50/15 on the street. I don't think anything higher is necessary. Also, I run 35psi all around. Just my preference.

 

Again I learn a little more.

Maybe I'll try this Sunday? Dunno but, am pretty sure I'll still be slow.

Thanks D.

A.

 

for autocross, i used to run 42r/40f.....at the suggestion of an expirenced ff driver, I switched to 38r/42f. It has been my limited expirence that with the lower rear pressure, the car transitions to an oversteer sitiuation in a more progressive fashion. With the stiffer rear, the car transitions in a more dramatic fashion. I change my pressures depending on the course.
On the track i run about 34f/36r cold which works out to about 40f/40r hot, depending on conditions
On the street i run the recomended pressures so if I lose control as a result of a tire failure, I can sue someone

 

i understand
ppl telling me they run 195/55/15 proxes say 34psi front and rear is fine
i just want somethign OK for maximum least wear and mileage
like 33-34 is what i think i guess

 

How hard could it be to try different pressures on your own to find something you are comfortable with?

People have already offered you their tidbit of advice and an online debate has even gone through with the characteristics of higher/lower rear tire pressures.

Fire off some neurons and drive the car......

 

I didn't see anyone mention the recommended stock PSI is 35f and 33r. It's located on the sticker inside of the drivers door.

Mattj

 

GOOD POINT !!!!

to Matt J:
PS=&gt; love your brake ducts ! My expo pics are in a slide show for my screen saver and I love your brake ducts.