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Unread 03-26-2015, 12:02 AM   #1
808G19
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Default Hill climb on loose dirt and rocks question.

A few months ago I was on a trail and came upon a hill with soft dirt and loose rocks beneath it. I started off good and slowed down due to another 4Runner a 5th gen Trail Edition kicking up a dust storm, my sr5 4Runner started to get stuck then my dash started beeping while the skid, Trac vsc lights started flashing while still accelerating. I was just wondering, is that normal?
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Unread 03-26-2015, 12:38 AM   #2
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Originally Posted by 808G19 View Post
A few months ago I was on a trail and came upon a hill with soft dirt and loose rocks beneath it. I started off good and slowed down due to another 4Runner a 5th gen Trail Edition kicking up a dust storm, my sr5 4Runner started to get stuck then my dash started beeping while the skid, Trac vsc lights started flashing while still accelerating. I was just wondering, is that normal?
Yes, that's normal. All that means is that your traction control was kicking in and telling you that your tires are slipping.

Were you in 4WD? If your center diff had been locked, those lights would not be coming on due to VSC being disabled.

Best thing to do in that situation is just ease up on the throttle and let your wheels grab traction again. If you try to accelerate, not only will your wheels slip even more, but the VSC will kick in and cut your throttle anyways.
Preferably, try to anticipate this situation beforehand and switch into 4hi or even 4lo if necessary. If you're on dirt/ offroad trails, you should probably just switch to 4hi anyways for the added stability and traction.
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Unread 03-26-2015, 04:57 AM   #3
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Thanks for your response. Mines a full time 4wd v8 and I was in 4hi. Forgot to mention that I also could feel and hear some kind of vibration under My foot area.
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Rear: ICON Shocks and All Pro 3.5" springs
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Unread 03-26-2015, 08:12 AM   #4
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Thanks for your response. Mines a full time 4wd v8 and I was in 4hi. Forgot to mention that I also could feel and hear some kind of vibration under My foot area.
Ok gotcha. Airing down tires makes a huge difference in a situation like that too.
The vibration is normal as well, it's the vsc system kicking in
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Unread 03-26-2015, 08:57 AM   #5
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Quote:
Originally Posted by 808G19 View Post
Thanks for your response. Mines a full time 4wd v8 and I was in 4hi. Forgot to mention that I also could feel and hear some kind of vibration under My foot area.
You weren't in 4HI unless your center diff was locked, and if those lights were flashing then your center diff was not locked, so you were just in AWD.
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Unread 03-26-2015, 10:27 AM   #6
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I'm am not used to this vsc Trac stuff. But thanks for all your responses.
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Unread 03-26-2015, 02:09 PM   #7
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You weren't in 4HI unless your center diff was locked, and if those lights were flashing then your center diff was not locked, so you were just in AWD.
Mikestang, you just confused the poop out of me. What's the difference between 4hi (unlocked) and AWD?

I tried to research this, and came across your post in another thread where you said:
"Not only can you run 4HI (center diff unlocked) on dry pavement, you are SUPPOSED to every couple months if you're not engaging 4HI otherwise to keep the front diff/axles properly lubed."

Is it just phrasing? "4hi" is technically when locked, "AWD" is the normal modus operandum for v8?
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Unread 03-27-2015, 12:59 AM   #8
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No, they mean different things and if that's what I wrote about the v8 then I was wrong. It has to do with how torque is split to the wheels and how aggressive the computer gets. Locking the center diff is true 4HI with a XX/YY torque split front/rear, someone will fill in the numbers. Otherwise the v8 is AWD where power is split around to each wheel that has the most traction.
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Unread 03-27-2015, 08:27 AM   #9
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Quote:
Originally Posted by Mikestang View Post
No, they mean different things and if that's what I wrote about the v8 then I was wrong. It has to do with how torque is split to the wheels and how aggressive the computer gets. Locking the center diff is true 4HI with a XX/YY torque split front/rear, someone will fill in the numbers. Otherwise the v8 is AWD where power is split around to each wheel that has the most traction.
Thanks for clearing that up Mike. That's basically what I thought it was, I'm not sure why I got so confused by what you said earlier
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Unread 03-27-2015, 12:32 PM   #10
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I will make it simple. Lock the center diff when doing offroad climbs, and pending on the obstacle go to 4Lo.

This kicks ATRAC up a notch, makes the drivetrain work a lot less, maximizes traction on all 4 wheels.
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Unread 03-27-2015, 10:39 PM   #11
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Originally Posted by bulldog View Post
I will make it simple. Lock the center diff when doing offroad climbs, and pending on the obstacle go to 4Lo.

This kicks ATRAC up a notch, makes the drivetrain work a lot less, maximizes traction on all 4 wheels.
That's about as simple as it gets!
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Unread 03-27-2015, 11:29 PM   #12
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Quote:
Originally Posted by bulldog View Post
I will make it simple. Lock the center diff when doing offroad climbs, and pending on the obstacle go to 4Lo.

This kicks ATRAC up a notch, makes the drivetrain work a lot less, maximizes traction on all 4 wheels.
Ok, got it. Thanks.
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Front: Toytec/Eibach Bilstein Height Adjustable Coilovers
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Unread 03-28-2015, 06:26 PM   #13
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Agree with Bulldog.

Locking center diff gives you a "locked" split of 50/50 front to rear. There is nothing active in the axle diffs that sends power left or right. That is regulated via the ATRAC system by using the brakes on each wheel to slow/stop the spinning wheel to diver power to the opposite wheel on the same axle.
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