Posted By: brads70
Tire pressure suggestions 18" rim Falken 615K rubber? - 07/06/14 07:15 PM
Any suggestions for air pressures?
295/40/18 rear
315/30/18 front
Suggestions for regular street driving and autocross would be helpful!
Thanks Brad
Posted By: Tomswheels
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/07/14 02:37 AM
The sidewalls on the 615k are pretty stiff, they can be run at fairly low pressure. I run 32 psi all around on street, 30 front 28 rear for autocross. Some of my competitors on them run as low as 26 F 22R....
Posted By: BigBlockMopar
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/07/14 10:52 PM
Are those pressures with hot or cold tires?
I'm thinkin cold.
If cold, how much pressure do they end up with when hot?
Posted By: Tomswheels
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/08/14 02:43 AM
You are correct most tires need higher pressure for Autocross so the sidewalls don't roll over. I ran the Dunlop Z2 and they liked a bit more pressure, 38F and 36R. Lighter cars like Miatas always seem to like more pressure than heavy cars like ours. The pressures I use on the 615K are cold pressures, again with the 615 K you don't get huge pressure increases as the tire doesn't get overheated by falling over on itself. It's a very stable, planted tire in the corners and the pressure after most Autocross runs in my Valiant is rarely up more than 1 or 2 psi. Any more pressure increase than that and you're over driving...
Posted By: blown340
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/08/14 10:36 PM
I just use the old school shoe polish or chalk trick. Draw a line of shoe polish across the tread and down the sidewall. Make a run and adjust pressures so that the polish is worn off all the tread and just a little onto the sidewall. Do this on all 4 wheels each run until you have a consistent pressure that works for each tire.
Posted By: MrAngry
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/21/14 08:50 PM
Hey Brad -
I run 615k's on my Mustang for road course duty - 315 squared set up. I start them out at 24 psi as hot temps climb to 34. For Auto-X you may want to start a bit higher though - maybe 25/26.
Just my
Posted By: MrAngry
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/21/14 11:20 PM
That's a bad ass car right there...
Posted By: RTSE4ME
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/22/14 11:40 PM
I like it!! You did a nice job.
You should do the rear also.
Posted By: PHJ426
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/27/14 07:16 AM
That looks great! I take it those are repop fenders that got the treatment? You might start a trend and be selling some 315 series front fenders for Challengers here.
What manufacturer for the 18" mini lite style wheels there?
Posted By: PHJ426
Re: Tire pressure suggestions 18" rim Falken 615K rubber? - 07/27/14 05:36 PM
I hear that Brad.....the cornering section appears to be a bit more forgiving on modifications.
So how does the car feel with the 315/295 combo? I forgot your t/bar spring/swagger/shock setup.