Been following this thread with great interest.
I'm considering buying a set of 255/85R16 ST Maxx and am wondering if owners of this size (or 255/80R17 - same specs), could provide me with some real world 'on the vehicle' measurements:
1) Actual tread width in contact with the ground.
2) Tire...
Compressor Progression
I first started using my ARB locker compressor to fill my 12.5 by 15 tires which worked, but I was exceeding the compressors' duty cycle and it was extremely hot when finished, from 18 psi to 30 psi. When I got my Goodyear MTR/Kevlar 315/R16 that was whole different ball...
The instructions for the Spidertrax spacers I have are to red locktight them and torque to 80 ft-lbs - no more. I am surprised how few people seem to read the installation instructions - I often hear "well I cranked up the impact gun on them". Over torquing them can pull the steel studs through...
I guess Warn has it wrong ...
See page 11, Before You Pull,second paragraph
http://www.warn.com/corporate/images/90/TechGuide_PN62885-A2.pdf
I am on my third winch which is a Toyota mechanical PTO, the first was a 12 v Warn 8274 and second was a 24 v Warn 9000i.
Winch cable should be rewound with a significant amount of tension, otherwise the line will be pulled between the lower coils. The proper amount of tension can't be done by rewinding by hand. The best way is is hook the cable to a tree on level ground and use the vehicle's rolling resistance to...
Sounds to me like engine is too small, if you have to run at the high RPM part of the torque curve, which burns a lot of fuel (2,600 RPM vs 1,800 RPM.) Have you tried bigger exhaust and increasing turbo boost?
These trucks seem to be primarily built for construction/landscaping/utility uses rather than efficient highway cruising, and are geared low (axle ratios 5.7:1 ?). That is good for low speed, heavy load applications, but it also leads to excessive RPM for moderate load applications, say...
Well if torque is flat from 1,600 RPM to 2,400 RPM, then cruising at 2,400 RPM chews up way more diesel for no added torque gain. Fuel consumption is closely related to engine speed.
What I am suggesting is to select tire diameter and diff ratios to allow the truck to cruise comfortably at...
max engine torque
Engines operate most efficiently (most power per unit fuel use), at maximum torque. The FG engine spec says 347 ft-lbs of torque at 1,600 RPM. So chose tire diameter and diff ratio combination that puts your cruising speed at 1,600 RPM.
What RPM you guys turning??