CDL Pin #7 Mod Why do it ?

[robbed666]

Hi All,

You'll have to excuse my ignorance. I've read the details of the pin #7 mod, but I don't understand what advantages it gives. Please can someone enlighten me, "As I wish to know the ways of all things Land cruiser". I'm not worthy !! (genuflects on floor).

Rob
(I need a beer!!)

 

[Junk]

[quote author=robbed666 link=board=2;threadid=16745;start=msg161452#msg161452 date=1085164568]
I'm not worthy !! [/quote]

Maybe if you tried to search or read some other previous posts

 

[MoJ]

Couldn't think of anything smart ass to say so I'll answer.......
Pin 7 allows you to use low range without having the CDL locked. (need CDL switch as well).

Try this link http://www.sleeoffroad.com/technical/tz_cdl_pin7mod.htm

 

[Doc]

So that your 80 doesn't lock the center differential when you shift to low range.

Gives you the option of running an open diff in low range. I wonder if it'd let you run locked front and rears without a locked center? That'd be interesting.

 

[Rogue]

The center diff must be locked to lock the F&R.

 

[robbed666]

Thanks for all the replies guys,

I know what it is, and how it is achieved. Its the advantage when driving I don't understand. If You have all the diffs open (FR&C) and you loose traction on one wheel, that wheel spins, and you loose drive to the other three wheels, ie you stop. If you have the centre diff locked you will need to loose traction to one Front & one rear wheel before you loose drive, and you stop (assuming open F & R diffs). Is it used for when using low on good paved surfaces to stop "diff wind up" ? Sorry for all the questions, just trying to get my brain around its purpose. I did do a search, and have read the Slee tech article.

Rob

 

[PHAEDRUS]

Rob,
it is precisely for the high traction surfaces in low range. ie launching obat at ramp. slick rock with tight turning radius. that is its only purpose.
Dave

 

[MoJ]

....pulling another vehicle out of the ditch when you're sitting on dry pavement

 

[drohweder]

[quote author=Phaedrus link=board=2;threadid=16745;start=msg161499#msg161499 date=1085167608]
Rob,
it is precisely for the high traction surfaces in low range. [glow=red,2,300]ie launching obat at ramp. slick rock with tight turning radius. that is its only purpose[/glow].
Dave
[/quote]

Thats useful information. I too have read all the threads on this topic of CDL, PIN 7 Pin19-something but simply telling us when and why you use it would be helpful for us who don't really have the experience nor the mechanical expertise or understanding.

List when and why you use this so we can make sense of things. Still going to do it as its the only mod I can afford right now ($58)

 

[Rookie2]

What it basically boils down to is.. locked diferentials don't work good (at least not for very long ) on hard surfaces. Pin 7 let's you use the 'L' gear pattern without locking the center diff.

fAvE - I'm getting there on the translation skills, i.e. no smart-alic comment this time on the o-bat thing .


Rookie2

 

[PHAEDRUS]

you can have you boats, I prefer my obat,

Dave

 

[offroadkid]

Now I see why it's useful. Thanks for the example of why it would be used.

 

[Boom7750]

But wait, there's more.
As others said, the CDL allows you to run in low range without the ECU automatically locking the center diff. Helpful for high-traction surfaces to avoid wind-up.
The pin-7 mod allows the ECU to use pre-programmed shift-points while in low range. In other words, the CDL alone will trick the computer into thinking you're still in high range, thereby shifting the tranny at the programmed HIGH range shift points. The pin-7 mod allows the ECU to use the pre-programmed shift-points for LOW range, which are assumed to be better for crawling.
You can run the CDL without doing the pin-7 mod quite happily. I did for along time. To be honest, I haven't really noticed much of a difference now that I did the pin-7, but hey, it counts in the all-important " how many mods ya got?" wars.
HIH, please correct if I'm talkin' outta my #$$
John

 

[DRTDuck]

Not wanting to confuse things too much, but. But how does putting the gear selector in 2 or 1 (on 95-97 models) differ from low range shift points?

Using the example of pulling a boat up a ramp, would putting it in 1 or 2 to get up the ramp accomplish similar results to putting it in low range unlocked?

 

[Boom7750]

DRTduck...Are you talking about putting the tranny in 1st or 2nd in HIGH or in LOW?
When I mention low-range shift points, I'm referring to the shift-points that are programmed into the ECU when in low range. The pin-7 mod allows you to access those shift points. The CDL, by itself, does not.
Putting the gear selector in 1 or 2 , assuming you're still in high range, will NOT accomplish similar results as being in low range.
If you're primarily concerned about pulling boats outta water, just do the CDL mod. More than adequate for your needs.
John

 

[DRTDuck]

Thanks John. I understand completely how the pin 7 mod works. I don't even have a boat to pull out.

I suppose I am hijacking a little. I guess my question is, what happens to the shift points in low as compared to high?

 

[Boom7750]

That's a good question. Maybe the ECU holds the rpms a little higher in low before shifting, or maybe it allows the tranny to shift at a lower rpm. I guess I'd vote for the latter, to better utilize torque vs horsepower, but its just a guess. I'm outta my league now...

 

[robbed666]

Now I understand,
As I already have the CDL switch fitted. All I have to do is the as mod as per Slee's tech article. Pulling a wire to get increased drive flexibility must by the best "bang for buck" ever. Thanks for the replies guys. I'm sorry if this was "going over old ground", so I'm grateful for the patience of the experienced members, and their explanations.

Rob

 

[cruiserdan]

When the transfer case is in low range the transmission shift points are "moved up" the rpm band. IE the trans shifts later than it does in high range. In addition, it also downshifts sooner on decelleration.