Vehicle & Technical > Defender

DETROIT LOCKERS AND DETROIT TRUETRACS

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extreme90:
arbs are easy peasy and simply the better option than a detroit
just cos the arbs are air dont make um complicated
ive built up 2 arbs into diffs, fitted them into the axles and had them un and running all on sunday
its easy

and when you want a std diff in tricky woods...not get pushed forwards...you can..then lock it at flick of a switch

sorry
but im same as rolla ARB

KAM's are leccy...leccy and water dont mix very well, yes ino the solenoid end everything is sealed to some extent...but what happens when water gets into the axles ?

clbarclay:
Just to clear up a few points about the different types of diffs used in 4x4s

ARB (manual locker) - Normally an open diff like standard, but on demand locks the wheels causing both wheels on one axle to rotate at the same speed. This sends up to 100% of the torque to either wheel.

Detroit locker - The name is miss leading, In normal action they are locked. When you turn a corner one side at a time can unlock and over run, so when you turn a corner only the inside wheel is driven (unless you have wheel spin in which case the outside won't over run and lock). A more accurate name might be a ‘Detroit unlocker’.

LSD - Limited slip, typically friction plates connected between each output from the differential to the input of the differential. This means that a minimum torque is delivered to both wheel. To make it driveable on the road the maximum torque that can be sent to one wheel (whilst the other is spinning) is not much compared to locking diffs, but enough to help in difficult terrain.

Detroit Truetrac (Torque biasing diff) - these typically use friction gears between the 2 outputs in place of the bevel gears found in open diffs. They have an inbuilt torque bias so the wheel with the most resistance receives 3 to 5 times the torque delivered to the wheel with least resistance. Using left foot breaking increase the resistance of a spinning wheel delivering more torque to the wheel with traction.

Viscous couplings (as fitted in later RRC) - This works as an open diff with a fluid that is thickened by a difference of speed between the outputs. The greater the speed difference, the more viscous the fluid becomes, increasing resistance between the outputs.


The reason I asked about a Truetracs on side slopes is that I've heard that the locked action of Detroit lockers and normal LSD can cause the car to crab down a slope compared to either a standard open diff or unlocked manual diff. I wanted to know if the Truetrac was going to reduce the current vehicles performance on side slopes.

extreme90:
it depends how good a driver you are  :wink:
and yes true tracks are very misleading...most people think they are open and lock up...nope...thats why i hate them

back to subject
ive found out after experimenting that its best on sidslopes with both front and rear diff's unlocked ... i.e std
with all 4 locked ive ended up down an embankment into a tree cos i had them locked up
so in a nutshell
i find std open diffs win on side slopes
but terrain plays a big part aswel as driver

Xtremeteam:
ARB FTW

Xtremeteam:

--- Quote from: "ScrapyJape" ---Well i bet what puts most people of is the price of 1 air locker and then having to buy a compresser and then wiring the compresser in and then getting the air line to your diff and then drilling a hole in your axle case..... LSD same as changing a diff.

I wouldnt say no to a set of ARB lockers but i would say no for the near £1000 price tag for having 2 of them in.
--- End quote ---
thats just you convincing yourself not to fit them,

there is a reason that nearly all the competitors on the OBC Oz use ARB's :wink::wink::wink:

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