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Toyota 4WD systems explained

2487 messages,  Last post on Apr 28, 2012 at 12:48 PM

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What is this discussion about? Toyota Sequoia, Toyota Highlander, Toyota 4Runner, Toyota Land Cruiser, Toyota RAV4, Toyota Tacoma, Truck, SUV

Messages Page 224 of 250

#2226 of 2487 Re: "08 Sequoia H4F mode vs H4L mode. [wwest] by hdfatboy

Apr 04, 2008 (5:54 pm)

Replying to: wwest (Apr 04, 2008 5:22 pm)
"Why would you think A-Trac couldn't be used with a mechanical LSD...?"
  
Maybe just because I'm NOT an IDIOT...??
  
Certainly not on the scale of Shrub.
  
With a Torsen center diff'l, say 30/70 F/R what additional capabilities would be added by including A-Trac....??
  
And think back... "
 
WWest...with all due respect....I have absolutely no idea what you're even talking about. Maybe others understand you but you seem to be alittle too off kilter for me to respond since you're not really making much sense. Maybe its just me...but I don't think so. Are you OK?
 
"Why continue to purchase Torsen Diff'ls from Zetel, or even pay them a license fee, once you come to the realization that A-Trac will do the job at an acceptable level for the public at large...? "
 
Clearly the engineers at some pretty reputable manufacturers like Audi, Subaru, GM and Toyota disagree with your POV, since they have combined mechanical LSDs with electronic traction systems. For me, its a great combination of technologies that puts more power on the road and still protects consumer from themselves. Sounds like you might consider a Highlander since you've already stated that it combines an open ctr differential with traction control software.
 
By getting a Highlander you save money on buying a vehicle with a Torsen CTR and can use the savings for more access to Techinfo.toyota.
 
"And are you STILL of the mind that the GMC Denali series has a center mechainical LSD? You haven't had much to say on that front lately."
 
I think your memory is struggling abit as I referenced a number of times that the 2001 Denali XL sitting in my driveway has a mechanical ctr LSD (viscous) combined with a mech rear LSD.
 
Here's Edmunds summary of the 2008 Denali XL which includes a "mechanical center differential " and a "rear locking differential". http://www.edmunds.com/new/2008/gmc/yukonxl/100894098/standard.html
 
Here's Edmunds summary of a 2001 Denali XL (which matches the information in my manual and all the literature I have on the vehicle, but no...I'm not going to disassemble the differental in my driveway and take pictures so that you'll "believe"): "Limited Slip Differential (Center)" and a "Locking Differential (Rear)". http://www.edmunds.com/used/2001/gmc/yukonxl/100001202/standard.html
 
Trust me....the US government really did really put a man on the moon.

#2227 of 2487 Re: "08 Sequoia H4F mode vs H4L mode. [hdfatboy] by wwest

Apr 04, 2008 (5:58 pm)

Replying to: hdfatboy (Apr 04, 2008 5:54 pm)
" I have absolutely no idea what you're even talking about.."
 
Yeah, I have noticed that.
 
I'm in Seattle, you are...??

#2228 of 2487 Re: "08 Sequoia 2WD = FWD..?? [wwest] by hdfatboy

Apr 04, 2008 (5:59 pm)

Replying to: wwest (Apr 04, 2008 5:35 pm)
""..the '09 Sienna is undeniably a RWD..."
  
Are you certain sure..?? How, where does it say..??"
 
Why are you posting false quotes? I did not make make the quote above. The Sienna is a FWD minivan. You either have me confused with someone else or you are purposefully fabricating false quotes.
 
I'll leave it to the moderator to address if appropriate, however you are losing what little credibility you might have had with your inaccurate information and now fabricating quotes of others
.

#2229 of 2487 Re: "08 Sequoia 2WD = FWD..?? [hdfatboy] by 2toyotas

Apr 04, 2008 (6:17 pm)

Replying to: hdfatboy (Apr 04, 2008 5:04 pm)
hdfatboy
 
      If I were you I would stop answering him, for your own sanity. Believe me, Techinfo.toyota has all the right info, and it is nothing like what Wwest is posting. I think he is trying to egg you on. Good Luck!!

#2230 of 2487 Re: "08 Sequoia H4F mode vs H4L mode. [hdfatboy] by wwest

Apr 04, 2008 (6:35 pm)

Replying to: hdfatboy (Apr 04, 2008 5:54 pm)
I just finished a brief review of the Edmunds threads, posts, concerning the GMC Denali 4WD implemenation. By about July of '03 the number of posts discussing the pros and cons of the OLD Denali LSD 4WD system vs the NEWER open center diff'l Traction Controlled 4WD systems are clearly available.
 
Some of those posts are expressing concern about the rear mechanical LSD not being available as an option with the new braking implemented 4WD system.
 
July of '03, now why does that seem to ring a bell...??
 
Sorry about the '09 Sienna slip-up, I have corrected it.

#2231 of 2487 Re: "08 Sequoia 2WD = FWD..?? [2toyotas] by wwest

Apr 04, 2008 (6:37 pm)

Replying to: 2toyotas (Apr 04, 2008 6:17 pm)
Would you be so kind as to tell me, advise me, as to where I have quoted from techinfo.toyota.com something that is not there or is not true...??

#2232 of 2487 Re: "08 Sequoia 2WD = FWD..?? [wwest] by 2toyotas

Apr 04, 2008 (7:24 pm)

Replying to: wwest (Apr 04, 2008 6:37 pm)
4WD SYSTEM
1. General
 The 4WD model of the ’04 Highlander has discontinued the viscous coupling in the center differential.
 This system, which has adopted front and center differentials with bevel gears, employs TRAC control
in order to ensure the proper drive when a wheel slips, without the use of an LSD (Limited Slip
Differential) mechanism in the center differential. Thus, a lightweight system that offers high levels of
driving stability and drivability has been realized
 
This is the real 2004 Highlander New Car Features.

#2233 of 2487 Re: "08 Sequoia 2WD = FWD..?? [wwest] by 2toyotas

Apr 04, 2008 (7:30 pm)

Replying to: wwest (Apr 04, 2008 6:37 pm)
4WD SYSTEM
DESCRIPTION
 The 4WD model of the ’04 RX330 has adopted a full-time 4WD system that constantly distributes torque
at a ratio of 50:50 to the front and rear axles.
 This system, which has adopted front and center differentials with bevel gears, employs TRAC control
in order to ensure the proper drive when a wheel slips, without the use of an LSD (Limited Slip
Differential) mechanism in the center differential. Thus, a lightweight system that offers high levels of
driving stability and drivability has been realized
 
This is the real 2004 RX330

#2234 of 2487 Re: "08 Sequoia 2WD = FWD..?? [2toyotas] by 2toyotas

Apr 04, 2008 (7:32 pm)

Replying to: 2toyotas (Apr 04, 2008 7:30 pm)
4. Transfer
The engine type is changed from 3MZ-FE to 2GR-FE. Because of this change, an MF2AV transfer is adopted.
The MF2AV transfer is similar to the conventional MF2A transfer, however, the MF2AV transfer contains
a viscous coupling type LSD (Limited Slip Differential).
 The MF2AV transfer uses a viscous coupling to achieve the slip limiting effect for the center differential.
 
This is for the 2007 RX350

#2235 of 2487 Re: "08 Sequoia 2WD = FWD..?? [2toyotas] by wwest

Apr 04, 2008 (7:35 pm)

Replying to: 2toyotas (Apr 04, 2008 7:24 pm)
Sorry, I wasn't even aware that earlier AWD Highlanders (or even that there were earlier AWD HLs) used the VC, and right now I'm drawing a blank as to when or where I might have said something in conflict with that.
 
 If you don't mind helping at a slightly deeper level I'll be glad to go back and correct my mistake insofar as that might now still remain possible.
 
Given the RXes transition away from the VC starting in '04 this does not surprise me in that respect.

Messages Page 224 of 250

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