Stock Setup Tire Pressure

[smurfslayer]

KO2’s on the Raptor are special versions, with a lower load rating, “C” as opposed to the D/E load ratings of most other off road / truck tires. This is a big part of why the Raptor rides like it does and it’s one of the lightest off road tires we can put on the truck.

 

[No Clue]

My tires are all over the place... front left was 39 front right 38 rear left was liike 37 and 36 on frear right. Wow. I guess ill try to run a 40 front 36 rear setup.

I may need to find another tire though, I'm slipping all over the place.. its ridiculous.

When my tires are different from the other side it's been because the sun was hitting that side.

I run 35/34, and it tames the rear end. Keep in mind though that the lighter rear end is going to be susceptible to sliding out when you are going faster or have a rough or slippery surface on the road.

 

[Donovan]

I always run 4A now. When its raining or just got done being rain (wet/dew). I will have to research some better tires for wet.

 

[jzweedyk]

My tires are all over the place... front left was 39 front right 38 rear left was liike 37 and 36 on frear right. Wow. I guess ill try to run a 40 front 36 rear setup.

I may need to find another tire though, I'm slipping all over the place.. its ridiculous.

You are slipping because you have too much pressure in them. The tire is not making full contact with the road. Try a lower pressure. Radials are not so pressure sensitive on MPG, you should notice very little difference. Go through a car wash to get the tires clean, then very slowly drive through some light dirt (not mud) and see if your tires get dirty all the way to the edge. Also when you air down, the entire contact patch gets bigger, and the ride is smoother.

 

[smurfslayer]

Plus, with those high pressures, and winter you’re not getting a lot of heat into the tire at all. Not that there’s a lot of extra traction in the KO2’s when they’re hot, but cold + full pressure inflation = lots of slipping, even in 4a.

 

[BKB13]

I copied this from another thread and put it in my notes:

“
Instructors at Raptor assault asked the group "how many of you have the rear end kick out on bumps in normal everyday driving?". The majority of the class answered back w/ resounding yes and then they simply said, your PSI is too high in the rear.

We had a good discussion on tire psi. Here's my notes from the class:
-Raptors ship from factory at 48psi and should be aired down by the dealership upon delivery (which never happens)
-Ford procedure document state 36psi all around
-The instructors prefer 38f and 34r psi for normal driving
-Ford engineers prefer 34f/28r psi for off road driving WITH highway driving
-Ford engineers prefer 28f/22r psi for pure off road driving (no highway at all)
“

 

[isis]

I always run 4A now. When its raining or just got done being rain (wet/dew). I will have to research some better tires for wet.

I do this when it’s wet as well.

 

[Donovan]

Interesting pressures.

I do get the step out and big "tail" wag when I go over bumps fast. Especially this ****** ass ******* 495 beltway around DC.

 

[Steve Arm]

I copied this from another thread and put it in my notes:

“
Instructors at Raptor assault asked the group "how many of you have the rear end kick out on bumps in normal everyday driving?". The majority of the class answered back w/ resounding yes and then they simply said, your PSI is too high in the rear.

We had a good discussion on tire psi. Here's my notes from the class:
-Raptors ship from factory at 48psi and should be aired down by the dealership upon delivery (which never happens)
-Ford procedure document state 36psi all around
-The instructors prefer 38f and 34r psi for normal driving
-Ford engineers prefer 34f/28r psi for off road driving WITH highway driving
-Ford engineers prefer 28f/22r psi for pure off road driving (no highway at all)
“

Wow. Glad I found this thread, which I had exact same issue. Thanks.
I'm new to this. May I ask why use a lower psi on the rear?

 

[dewalt]

A set of scales is your friend