TEECEE

Just wondering, in all your opinions, what is the best PSI to be running in our Z's?? Regular warm weather.

Higgs Boson

I would say 15 is a nice round number....

Oh did you mean TIRE pressure???? 30 cold.

TEECEE

haha. Yes!!

Dfwz06

Yup, 15 on the blower and 30-32 on tires
Or 20 on drag radials

TEXHAWK0

Just run 30 psi like it says inside the door.
It is amazing that someone would think they know better than the engineers that designed the tire and built it for the Stingray.
The ideal tire pressure is the same whether the ambient temperature is warm or cold, but obviously you would need to adjust the tire pressures periodically since they change with temperature.


If you are running 15 psi in the car, you must be below sea level.

Bill Dearborn

I run 30 psi cold on the street. I run the Cup2s at 28 on the track. With my DOT Rs I run 28 front and 26 rear on the track.

Bill

Greg00Coupe

[QUOTE=TEXHAWK0;1593843364]Just run 30 psi like it says inside the door.
It is amazing that someone would think they know better than the engineers that designed the tire and built it for the Stingray.
The ideal tire pressure is the same whether the ambient temperature is warm or cold, but obviously you would need to adjust the tire pressures periodically since they change with temperature.


If you are running 15 psi in the car, you must be below sea level.[

Agree with that!!!! You know GM the manual and door thing says 30 PSI...... I'm sure you have the Michelin Man agreeing too.......... but let me ask the experts on the Forum. After all they always agree with one another and are the true experts..........geesh.

TEECEE

Cool. I always do run the manufacturers specs but I like to hear everyone's opinions.

thebishman

You will not notice any degradation in performance or wear rates IMHO by running both the MPSS and MPSC2s at 28 on the street. You will notice a little more compliance and won't trigger a warning light for the TPMS system.

On a road course you want to be no more than 25/26 psi cold on the PSC2s.

Bish

capevettes

30 cold seems to be the sweet spot on the street for performance and wear.

TEXHAWK0

Whew! Good to know that the GM engineers got it right.

Widgeon5

There are GM design/performance engineers and there are GM CAFE compliance engineers. With manufacturers striving for every .01 MPG improvement, there are some easy ones availaable with a simple tire pressure increase. Who knows how these considerations played out with our Corvettes?

HMDS

Hope these aren't the same esteemed engineers that worked on the Ford Exploder who put something like 24 or 26 psi on the door sticker and then tire treads separated killing people. Just sayin. That door sticker ain't no bible.

That said I do run 30 on the street and 26-28 on track per the dash display but have found cosworth shows 1/2 pound lower. No tread separation on the street yet. Need a better gauge I think.

AZGASSER

What is the max pressure we should worry about for the MPSS? We get such temp swings in the desert. Don't want to blow a tire.

AVETTE

I sometimes gain 8 10 10 psi in one 30 min session what is your psi at the end of your session assuming you start at 28

Greg00Coupe

Dont believe that was the case. People died because they let the pressure drop below what was recommended.

I've gotten a lot of good info on the forum in 16ish years but never knew we had folks who could analize tire performance in tenths of pounds.

tobaccokid

Opinions regarding nitrogen fill? I've been told there is less expansion/contraction with nitrogen.

Higgs Boson

waste of time and money on a street car and most race cars.

Thomasmoto

I thought stock boost was more like 8-9 lbs? I've changed both pulley's and need an aftermarket/better boost gauge now. It just pegs the needle to 15 now. I don't know the exact pulley ratios, but I'm guessing 15-18% maybe? The top pulley is a 2.31 from Metco.

Rd16rr

....@30psi and Cups, the risk of denting a rim is fairly high....32 helps.....34 is ridiculous