Tire size recommendations for a 1995 FJ80 with a 2" OME Lift?

[b16]

inline 6 engines are very well balanced; 4k RPM should be no problem. I imagine the limitation of rev's on these motors has more to do with airflow in the head than the bottom end.

 

[Nay]

Wow, really, I have always tried to maintain at 3000 rpm. or so for optimum hill climbing, and 2500 for flat ground. I find that range to be the sweet spot for optimal engine load. But maybe I'm wrong.

My target range is to be around 2,700 RPM at 70 mph in OD. In my case, that's 37's on 5.29 (net about 18% lower than stock ratio between tires and diff gears so sez my Yellow Box) and why I have always favored "up one ratio", because I see zero reason to retain 90 mph on big tires and lift.

OD off @ 60-65 mph is around 3,400 - 3,600 RPM. If I am dropping into 2nd, I'm down at 45-50 mph and not running it up a higher RPM over any distance - the lower gears really take 2nd out of the equation for use over distance whereas on 35's you might find it has a good range. Anyway, I can run up I-70 out of Denver from 6K-11K feet at speed limit (65 mph) as long as it isn't heavily loaded. That's why I kept my 80 light (didn't add more weight). Adding my family, dogs, and gear...not happening on any steeper grades. That's why I just bought a '04 Sequoia...well...and size.

So back to tire size, I actually liked 35's better on stock gears than 33's, because I thought the OD=off RPM range was better over longer distances. Yes, there is some gearing leverage loss in 33" to 35", but with an auto transmission it's more where 3rd and OD slot in the RPM range (to the extent you are already under geared) and speedo correction made a big difference because shift points are where you want them.

Offroad...there is no substitute for gears. It's all bad with stock gearing, even 33's. Onroad...it's all perfuming pigs anyway.

 

[LandCruiserPhil]

Wow, really, I have always tried to maintain at 3000 rpm. or so for optimum hill climbing, and 2500 for flat ground. I find that range to be the sweet spot for optimal engine load. But maybe I'm wrong.

You are not pulling much of a hill if your limit is 3000 rpm and you are generating lots of heat in the process.

Read the time of year and the steepness of my video then look at my water temp. Point is the engine is super happy and cool running at 4200, how could it be bad.

I run stock gears, 35's, ~6700lbs travel weight, aftermarket low range gear set, and even for free I would not change my set up.

Notice the temp gauge below .....happy

35's and never a need to look back

 

[BrooklynFJ80]

285/75/16's
OME 2.5" Full heavy lift with MAF 30mm front spacers
View attachment 1315555

@jwilliams I noticed you're running heavies with only a front bumper and winch. Nothing in the rear? If not does it still ride ok? Also, how are those Coopers holding up? About to take the plunge!

 

[BltByKrmn]

OME 2.5" lift with 33" (285/75) Goodyear Duratracs, wish I had 35" Duratracs to be honest.

 

[jwilliams]

@jwilliams I noticed you're running heavies with only a front bumper and winch. Nothing in the rear? If not does it still ride ok? Also, how are those Coopers holding up? About to take the plunge!

Nothing in the rear. I used to tow a boat so the rear heavies made a lot of sense then. Sold the boat but now they are just a little stiff. I am happy with the ride still.
Cooper ST/MAXX's are holding up really well. I would recommend them to anyone. The rain and snow handling is much better than the BFG KOs I had, and the sidewalls are stronger than the duratracs.