Re: [ISTA] NP205 X-Fer Case..Driveline Gurus..

["Hummer Guy" <atiprogmc@hotmail.com>]

This is the problem we are having....nobody really knows for absolute SURE 
what is the reality here.....  I've talked to a few GM technicians as well 
as some others from different manufacturers and some are really good with 
their trade and some that don't know their  ball-joints from their U-joints.
I have spoken with people who claim that x-fer case "A" will do this and 
that, and that x-fer case "B" will only do so and so.
My own personal experience with the auto-trac's is what I have seen with my 
own two eyes.
As far as the delay in taking too long to disengage....we can eliminate that 
when we program the PCM that controls the x-fer case.....basically fool it 
into thinking that traction has been restored sooner than it is being led to 
belive based on sensor inputs.
Trial and error sessions at the local 1320 will be necessary to find out at 
what RPM/speed/etc that the x-fer case needs to disengage.  The engage time 
is not an issue....just as long as it's in 4x4 auto at the starting line, 
we're all good.
We are not interested in engagement.....we need a nice smooth DISengagement 
so that we don't eat unnecessary HP after the 60' or somewhere thereafter 
(again, based on trial and error).
Start obsessive professor mode:  Let's do some research people!!!

Later for now,
Matt
atiprogmc@hotmail.com


>From: decodave@webtv.net (David Petterson)
>To: atiprogmc@hotmail.com (Hummer Guy)
>CC: syty@syty.org
>Subject: Re: [ISTA] NP205 X-Fer Case..Driveline Gurus..
>Date: Thu, 22 Jun 2000 23:33:51 -0700 (PDT)
>
>Well maybe I'm not listening BUT I have gone to the dealership & read
>the manuals & spoke with the mechanic that knows these things.  HAVE
>YOU?
>According to them there is NO "electronic clutch".
>The Auto-Trac is just a addition to the 4-whl anti-loc sensors that when
>slippage is sensed it turns on the x-fer case 4-whl loc actuator & ties
>the front & back together. NO proportional split , just on or off ,
>which according to the manual can take up to 30 seconds.
>I have heard that Subarue may have something like we're looking for .
>I'll be going there real soon.
>
>   Thank    You   Much                                           Dave
>
><< Message3.txt >>

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