What tire pressure working well over 100mph - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

lionssfan · 10-16-2019, 03:49 PM

I'm going on a road rally. Top speeds of 140mph. What tire pressure with stock tires (Eagle F1 frts.285/35/20 rr.305/35/20) have you experienced works well for cold setting. Owners manual says 44psi cold setting over 100mph. Of course the pressure will be higher when they get hot. Just would like to know others exprience.

Zslash28 · 10-16-2019, 05:44 PM

What event are you doing? How long will you be at the sustained speed?

1911 1LE · 10-16-2019, 07:27 PM

I run the front F1s at 44 psi and the rear Hoosier R7s at 80% of max psi, but I'm only a mile at a time. 196mph on the top end so far

pat_t · 10-17-2019, 09:43 AM

Similar to 1911 1LE I ran the front Trofeos at 45psi upto 167mph on a runway event. Rears I left at ~32psi, they came upto about 35psi and it was a hot day.

On trackdays I stick with lower, aiming for ~32psi hot all round. Have run various tyres on the Z/28 (Trofeos, Michelin Cups, Nittos) all upto ~140mph for multiple laps with no problems.

Although speeds will be high on a road rally, you're less likely to be as near to the limit of the tyre's performance as you are on a trackday (unless you're really brave!!)

just my 2cents

lionssfan · 10-18-2019, 01:42 AM

Thanks for the input guys! I set mine to 38 to 37 frt. and back. When hot they where 40 41 today. Suprising it wasn't as harsh a ride going from 27 psi to 40 psi.

lionssfan · 10-18-2019, 01:45 AM

I should be discreet on the event right now. Dont want tip off the police lol

j o n · 10-18-2019, 06:31 AM

Quote:

Originally Posted by lionssfan

I should be discreet on the event right now. Dont want tip off the police lol

If the road rally is only "top speeds of 140+" for minimal amounts of time, like how road racing events are. The normal tire pressures should suffice.

10-16-2019, 03:49 PM	#1
lionssfan Drives: 2010 2ss camaro Join Date: Nov 2010 Location: mi Posts: 1,184 View My Garage	What tire pressure working well over 100mph I'm going on a road rally. Top speeds of 140mph. What tire pressure with stock tires (Eagle F1 frts.285/35/20 rr.305/35/20) have you experienced works well for cold setting. Owners manual says 44psi cold setting over 100mph. Of course the pressure will be higher when they get hot. Just would like to know others exprience. __________________ 2012 zl1 stock 7000 miles 2010 TVS2300, BTR cam PD stage 3, ID1050 injectors, CHE bronze trunnions, 7.400" pushrods,.660" lift platinum springs, Titanium ret, Zl1 fuel pump, Kooks LT headers, High flow cats, Roto Fab CAI, Corsa exh., Mellings oil pump, HD chain, ls2 damper, all synthetic, BMR control arms, zl1 toe link, BMR cradle mounts, W/bottle relocation, air scoop deflector, Hennessy wheels, two piece rotor, morimoto fogs, DRL harness, coilovers, Heads up install, mgw shifter, slps splitter, slp spoiler, zl1 side skirts, painted strips, debadged, tinted, 2018 emblems. Edit Signature

10-16-2019, 05:44 PM	#2
Zslash28 Jumanji Drives: '14 Z/28 - AGM - No A/C Join Date: Mar 2014 Location: Alaska Posts: 1,688	What event are you doing? How long will you be at the sustained speed? __________________ Keeper of the 5th Gen Z/28 Registry. Registry Facebook. Follow: @5th_gen_z28_registry I track wrecked Z/28s Total lost -41

10-16-2019, 07:27 PM	#3
1911 1LE Drives: 2015 SW 2SS 1LE Join Date: Jan 2018 Location: 78155 Posts: 308	I run the front F1s at 44 psi and the rear Hoosier R7s at 80% of max psi, but I'm only a mile at a time. 196mph on the top end so far __________________ Maggie 2650 @ 18psi/ 75mm 10 rib/ Dual alky nozzles/ Roto-fab/ ARH 2" Lt's/ GT-12 cam/ ZL1 3.23 Conv./MGW/RPS triple carbon clutch/RSG tranny upgrage/Pedders Ex. XA w/ remote cans and a lot of other crap 897/8??@tires

10-18-2019, 01:42 AM	#5
lionssfan Drives: 2010 2ss camaro Join Date: Nov 2010 Location: mi Posts: 1,184 View My Garage	Thanks for the input guys! I set mine to 38 to 37 frt. and back. When hot they where 40 41 today. Suprising it wasn't as harsh a ride going from 27 psi to 40 psi. __________________ 2012 zl1 stock 7000 miles 2010 TVS2300, BTR cam PD stage 3, ID1050 injectors, CHE bronze trunnions, 7.400" pushrods,.660" lift platinum springs, Titanium ret, Zl1 fuel pump, Kooks LT headers, High flow cats, Roto Fab CAI, Corsa exh., Mellings oil pump, HD chain, ls2 damper, all synthetic, BMR control arms, zl1 toe link, BMR cradle mounts, W/bottle relocation, air scoop deflector, Hennessy wheels, two piece rotor, morimoto fogs, DRL harness, coilovers, Heads up install, mgw shifter, slps splitter, slp spoiler, zl1 side skirts, painted strips, debadged, tinted, 2018 emblems. Edit Signature

10-18-2019, 01:45 AM	#6
lionssfan Drives: 2010 2ss camaro Join Date: Nov 2010 Location: mi Posts: 1,184 View My Garage	I should be discreet on the event right now. Dont want tip off the police lol __________________ 2012 zl1 stock 7000 miles 2010 TVS2300, BTR cam PD stage 3, ID1050 injectors, CHE bronze trunnions, 7.400" pushrods,.660" lift platinum springs, Titanium ret, Zl1 fuel pump, Kooks LT headers, High flow cats, Roto Fab CAI, Corsa exh., Mellings oil pump, HD chain, ls2 damper, all synthetic, BMR control arms, zl1 toe link, BMR cradle mounts, W/bottle relocation, air scoop deflector, Hennessy wheels, two piece rotor, morimoto fogs, DRL harness, coilovers, Heads up install, mgw shifter, slps splitter, slp spoiler, zl1 side skirts, painted strips, debadged, tinted, 2018 emblems. Edit Signature

10-17-2019, 09:43 AM	#4
pat_t Drives: . Join Date: Jun 2016 Location: . Posts: 589	Similar to 1911 1LE I ran the front Trofeos at 45psi upto 167mph on a runway event. Rears I left at ~32psi, they came upto about 35psi and it was a hot day. On trackdays I stick with lower, aiming for ~32psi hot all round. Have run various tyres on the Z/28 (Trofeos, Michelin Cups, Nittos) all upto ~140mph for multiple laps with no problems. Although speeds will be high on a road rally, you're less likely to be as near to the limit of the tyre's performance as you are on a trackday (unless you're really brave!!) just my 2cents