I have recently wrapped some Viper Reps in Nitto NT420S 265/35R22 (front) and 295/30R22 (rear). The tire pressure upon arrival was about 33 PSI. When I threw them on on the car they looked like they could stand another 4-5 PSI....it just looked LOW. A few of my buddies also thought they looked low. I contacted Nitto and they said I should be running 30 PSI in front and rear. I don't mean to undermine the vendor's input but I can't imagine dropping the pressure to 30.
I have a buddy who is getting a pyrometer for his M3 track days so we will see what the optimum pressure turns out to be.
Just wondering what other people think about this who might be running the same size tires.
BC coilovers, Eibach sways, Staggered 22 Viper Reps, Danko Chin and V2,
R1 Concepts, DI-NOC interior accents, custom billet MOPAR grille
emblem, misc BT.
I run about 36-38 PSI in the 265/35R22 tire size, Viper Reps as well. Definitely firmer, but I like it. I'm on the Nexen Roadians HPs.
I have stock sizes, & run 34/33 cold. When the car heats up & it's hot outside I get anywhere from 36/35, to 38/37. I run the fronts 1 psi higher.
Johan tune,LMI Hammer,BBK85mm TB, BB GP300X4 res del,180 tstat,tranzformer,MTCM,DC Sports front strut bar,speedlogix rear arched strut bar,stack sway bars,getrag lsd conversion,Ipod interface,hard wired V1,15% tint,yellow fogs,Black grill,catch can,upgraded 10" sub & kicker amp
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Next: Lower with BCR Coilovers.
2008 Charger R/T R&T
QuantumBlue • DiabloSport InTune • TranZformer • NoESP • Billet Technology Catch Can • Legmaker Air Hammer • Flowmaster American Thunder • Hankook V12 Evo • Factory Reproductions 20'' SRT Replicas • R1 Concepts Rotors • PosiQuiet Pads • Sequential Tail Lights • OEM HID Projector Headlights • Smoked HID Fog Lights • Daytona Grille • Debadged & Demolded
just follow whats on your door and run higher if you feel like it.
i wouldnt however recommend going at a lower psi than whats on the door
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Thanks for the responses. goooooooooooooooOOOOOOO TEAM!
PYROMETER RESULTS ARE IN!!
Here's the skinny:
rear tire (295/30R22) PSI=38
front tire (265/35R22) PSI=36
We ran the highway for about 15 minutes at 75-80 mph and pulled off to a gas station parking lot and took some temps (about 8 or 9 minutes after parking).
We took measurements at 4 places across the width of the tread starting at the outside and moving towards the inside:
Both REAR tires: 90, 92, 96, 98
Both FRONT tires: 89 all the way across
So what this tells us (we think) is that the front PSI is fine at 36 with even tread wear. The rear however, looks like it may need to be some camber adjustment.
Here is my concern:
About 3 months ago I had an alignment done by the dealer with my stock wheels and snow tires (i never got before or after readings from them....stupid me for not asking) and I have BCR suspension setup. As soon as spring rolled around and I started running the 22 Viper reps, when you stand back you can definitely see some negative camber. Since the pyrometer checks have revealed that wider rear tires are running hotter on the inside, we are assuming this is due to the factory camber setup for a stock tire and it's punishing the inside portion of the tread. They are brand new Nitto's and i don't wanna run tires bald on the inside by summer's end.
Here are my questions:
- Does anyone know how much of a PIA it is to adjust the camber?
- Is it possible to make a big enough adjustment to correct to problem or will i have to add camber plates to allow for more adjustment?
- Does anyone know a suspension expert in the New England area who help me out?
- Is there something else to look at and maybe we're barking up the wrong tree?
It doesn't sound like your camber is that far out, and with a bit lower of a PSI in the rears your tread wear should remain pretty even, and as I posted in the "Directional Tire" thread, at the end of the season, if you have a winter setup being in the NE, have the rear tires at least remounted and balanced turning them around so that the inside left becomes the outside right and vice versa for the next season.
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2005 300C: BC Racing, Eibach Sways, 22" Savini BM-7, SRT8 Bumper, SRT8 Full Exhaust, CF AirHammer CAI, Lots of BT and Color Matched under the hood, Color Matched Headlights with Blue Plasma Halos, Custom Painted Tails. Next Step: Interior.