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04-25-06, 12:50 PM
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#1 (permalink)
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Forum Regular
Join Date: Jun 2004
Location: Denison, Texas
Posts: 164
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Tech Question - What is the grinding-clicking noise you hear when A-TRAC is active ?
Does anyone know exactly what causes the grinding-clicking noise you hear whenever A-TRAC is engaged and is actively controlling wheel spin ?
Does this noise happen by design, letting you know it's active ?
Is it just a by-product of the ABS system, and if so, what is actually happening to make the click/grinding sound?
Is it in any way destructive or should it be a cause for concern during extended use of this system ?
Thanks
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Aye-chee-wa-wa
Mike
Oilive 73 FJ40
5.3 LS1 - SM465
4 cup holders
Denison, Texas
Last edited by logic2; 04-25-06 at 02:19 PM.
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04-25-06, 01:29 PM
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#2 (permalink)
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Forum Regular
Join Date: Dec 2005
Location: Saskatchewan
Posts: 195
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Some of the noise comes from the brake servo motor, some comes from the brakes, like ABS.
I believe that the the rest of the noise comes from the tranny/t-case as it loads and unloads during the operation of the a-trac system.
I dont think it would hurt anything for the short time that it's used.
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04-25-06, 03:00 PM
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#3 (permalink)
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Forum Lifer
Join Date: Jun 2003
Location: Raleighworld, NC
Posts: 2,535
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See above.
uzj100
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00 - UZJ100 - Step Sliders, Diff Drop, 865s, FRB's, BAK - 285/75 R 16
03 - UZJ120L
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04-25-06, 04:24 PM
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#4 (permalink)
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Forum Regular
Join Date: Apr 2006
Posts: 105
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It is the sound of it working 
__________________
 FJTT- "It's not so much the mud I hate as those trees right next to the mud that gives me concerns."
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04-25-06, 11:44 PM
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#5 (permalink)
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250+ Club
Join Date: Mar 2006
Location: Raleigh, NC
Posts: 392
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yeppp like he said when I first used A-TRAC i thought I had fucked up my Tranny but then it drove nice on the highway so I was like wtf?
It's like a grinding/clicking ABS noise.. not pretty but hey it's the way ti works
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04-26-06, 10:50 AM
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#6 (permalink)
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Forum Regular
Join Date: Mar 2006
Location: Henniker, NH
Posts: 21
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A-Trac & Roof Rack...
I got my FJC on 4-7-06 and haven’t even tried out the A-Trac. Well at least when I do now I won’t freak when I hear it do its thing…
Has anyone noticed a rattling sound from the roof rack at highway speeds? I can’t find anything loose but at 65-80 there it is…. Wonder if it’s air turbulence through the rack flexing the roof sheet metal?
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04-26-06, 11:04 AM
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#7 (permalink)
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Admin
Join Date: Jan 2002
Location: Appleton, WI
Posts: 8,360
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Quote:
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Originally Posted by VoltsAndBolts
Has anyone noticed a rattling sound from the roof rack at highway speeds? I can’t find anything loose but at 65-80 there it is…. Wonder if it’s air turbulence through the rack flexing the roof sheet metal?
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http://forum.ih8mud.com/showthread.p...ht=rack+rattle
welcome
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Brian 'woody' Swearingen
Owner, IH8MUD.com
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04-26-06, 07:01 PM
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#8 (permalink)
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Forum Regular
Join Date: Mar 2006
Location: Henniker, NH
Posts: 21
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Thanks for pointing me over there Woody.
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05-29-09, 01:08 AM
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#9 (permalink)
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Forum Regular
Join Date: Apr 2009
Location: San Diego (PB)
Posts: 24
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A-TRAC works by sensing free spinning and activating the brake for that one wheel, pushing torque across the axle to the other tire with traction. It then pulses the brake on and off to monitor when the wheel regains traction (i.e., stops free spinning), and this happens several times a second. This is opposite ABS, which is activated by and monitors for non-spinning wheels when braking. It sounds like clicking and grinding, but it's not. Hummer optimized this technology in the H1.
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'07 FJC 
Former toys: '71 FJ-40, '80 Datsun King Cab 4x4
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05-29-09, 08:40 AM
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#10 (permalink)
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IH8MUD Chupacabra
Join Date: Aug 2006
Location: Parker County, TX & Santa Fe County, NM
Posts: 461
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Quote:
Originally Posted by VoltsAndBolts
Has anyone noticed a rattling sound from the roof rack at highway speeds? I can’t find anything loose but at 65-80 there it is…. Wonder if it’s air turbulence through the rack flexing the roof sheet metal?
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__________________
'80 FJ40, '07 FJC
N5MUD
High Desert Cruisers
"What is life? It is the flash of a firefly in the night. It is the breath of a buffalo in the wintertime. It is the little shadow which runs across the grass and loses itself in the sunset."
- Crowfoot, Blackfoot warrior and orator
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05-29-09, 08:49 AM
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#11 (permalink)
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Forum Regular
Join Date: Jul 2005
Location: SE WY
Posts: 44
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Thanks 1911, it's time we all acknowledged the true source of rack rattle.
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'07 FJ Cruiser
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uzj100
woody
Gretchen
The Raisin
