4x4 / Off-Road TechThis section contains all discussion related to taking the FJ Cruiser in Off-Road situations, 4x4 applications and any armor modifications.
Exactly.. you don't want A-TRAC to apply brakes to rear wheels for several reason. But the most important one is because it'll shatter your rear axle.
How would an ATRAC applying brake be radically different from your foot applying the brake? Yes, it does it on only one of the wheels - but sending the brake force through the locked axel is no biggie - it is no more torque then from regular braking (up to the traction limit).
It would not do any good on a locked rear axel, but it should not shatter it. Just stop the vehicle.
I am glad that this mod has been done. Will need to ping my buddy with the FJ (but it did not change my mind on waiting for the 4dr JK to test out and buy.. )
IMHO
I truly don't think there will ever be a scenario in which ATRAC will apply brake pressure to either of the rear wheels when the rear locker is engaged. ATRAC will only be engaged if there is a difference in rotational speed between the two rear wheels. With the axel locked, this will never be the case. But I do agree with others that only extreme conditions would warrant such a configuration and is probably why Toyota did not feel it necessary to allow this configuration. Personally, I will be putting it to the test this weekend. I've been told the trail I am attempting shouldn't be attempted without locker f & r.
How would an ATRAC applying brake be radically different from your foot applying the brake?
I think he was making the point of ATRAC applying brake when your foot is on the gas pedal. I like to think I'm not in the minority in the fact that I take my foot off the gas pedal to apply it to the break pedal (unless I'm doing a massive standing burnout of course...but that's NEVER going to be done, nor attempted, in my FJ).
__________________
'63 Corvette Split-Window (5 spd MT)
'67 GTO (4 spd MT)
'72 K5 Blazer (Malibu (aka 'Chevy Voodoo') Blue/White Top, 4 spd MT w/ Granny Low)
'04 Mazda3 Hatchback (wife's, 5 spd MT)
'07 FJC (Voodoo Blue/6 spd MT)
Recently Sold (Gone But Not Forgotten):
'97 Viper GTS (Blue/white stripes, 6 spd MT)
'71 Bronco (4 spd MT w/ Granny Low)
'65 Mustang Fastback (4 spd MT)
YES...My left foot gets sad if it doesn't have a clutch pedal near by...
I think he was making the point of ATRAC applying brake when your foot is on the gas pedal. I like to think I'm not in the minority in the fact that I take my foot off the gas pedal to apply it to the break pedal (unless I'm doing a massive standing burnout of course...but that's NEVER going to be done, nor attempted, in my FJ).
The Trail Teams use what they call the "Left Foot Breaking Technique". See chat:
I understand & that's good info...but I'm was just trying to address the 'typical driver' under typical conditions...I think it's probably safe to say the Trail Team members have a little more off-road driving practice compared to most (although no one will admit it of course).
Kind of reminds me of heal & toe driving...drivers on race courses will do it all the time, but your typical driver wouldn't. And come on Bill, you & I both know the 6 spd MT in these FJs are a million times more fun than the 'Trail Team Approved AT'!!! (especially if you're in a VB FJ)
__________________
'63 Corvette Split-Window (5 spd MT)
'67 GTO (4 spd MT)
'72 K5 Blazer (Malibu (aka 'Chevy Voodoo') Blue/White Top, 4 spd MT w/ Granny Low)
'04 Mazda3 Hatchback (wife's, 5 spd MT)
'07 FJC (Voodoo Blue/6 spd MT)
Recently Sold (Gone But Not Forgotten):
'97 Viper GTS (Blue/white stripes, 6 spd MT)
'71 Bronco (4 spd MT w/ Granny Low)
'65 Mustang Fastback (4 spd MT)
YES...My left foot gets sad if it doesn't have a clutch pedal near by...
I understand & that's good info...but I'm was just trying to address the 'typical driver' under typical conditions...I think it's probably safe to say the Trail Team members have a little more off-road driving practice compared to most (although no one will admit it of course).
Well, if you are locked AND A-TRACed, I sure hope you are not in a typical condition!!!
Quote:
Kind of reminds me of heal & toe driving...drivers on race courses will do it all the time, but your typical driver wouldn't. And come on Bill, you & I both know the 6 spd MT in these FJs are a million times more fun than the 'Trail Team Approved AT'!!! (especially if you're in a VB FJ)
Well, if you are locked AND A-TRACed, I sure hope you are not in a typical condition!!!
Good point.
Quote:
bigbill25 previously said:
Damn straight
--Bill
The ultimate point.
__________________
'63 Corvette Split-Window (5 spd MT)
'67 GTO (4 spd MT)
'72 K5 Blazer (Malibu (aka 'Chevy Voodoo') Blue/White Top, 4 spd MT w/ Granny Low)
'04 Mazda3 Hatchback (wife's, 5 spd MT)
'07 FJC (Voodoo Blue/6 spd MT)
Recently Sold (Gone But Not Forgotten):
'97 Viper GTS (Blue/white stripes, 6 spd MT)
'71 Bronco (4 spd MT w/ Granny Low)
'65 Mustang Fastback (4 spd MT)
YES...My left foot gets sad if it doesn't have a clutch pedal near by...
IMHO
I truly don't think there will ever be a scenario in which ATRAC will apply brake pressure to either of the rear wheels when the rear locker is engaged. ATRAC will only be engaged if there is a difference in rotational speed between the two rear wheels. With the axel locked, this will never be the case. But I do agree with others that only extreme conditions would warrant such a configuration and is probably why Toyota did not feel it necessary to allow this configuration. Personally, I will be putting it to the test this weekend. I've been told the trail I am attempting shouldn't be attempted without locker f & r.
You are correct... the ATRAC will NOT even LOOK at the rear axle if the two wheels are locked together via the rear locker. I have played with my FJ a few times locked and Atrac'ed together, and it works amazingly well. Like a front AND rear locker.. only you can turn.
Like stated a million times before, the ATRAC only senses different wheel speeds within the same axle.. therefor having the rear locked makes the computer simply ignore that axle.
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