[T3] 72 FI

[Daniel K. Du Vall]

Question  is the throttle shaft smaller on the early FI than the later FI? 
The pictures MAX has seem to indicate that the one I have is much larger.

Daniel Du Vall
http://1peter4-10.org
http://volkswageninsanity.us

-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Daniel K. Du Vall
Sent: Saturday, January 19, 2013 12:51 PM
To: type3 at vwtype3.org
Subject: Re: [T3] 72 FI

Here is the one I have off the stuff from Mike Fisher:

http://volkswageninsanity.us/Postings/FI/


Daniel Du Vall
http://1peter4-10.org
http://volkswageninsanity.us


-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Dennis Stiefel
Sent: Saturday, January 19, 2013 10:20 AM
To: type3 at vwtype3.org
Subject: Re: [T3] 72 FI




On 19 Jan 2013 at 7:48, Dennis Stiefel wrote:

> The TPS on modern cars dose tell the computer a percentage of how far 
> the throttle is open.  For example most modern cars with automatic 
> trans needs this info to compare with vehicle speed and other things 
> to know when to change gears and lock the torque converter among other 
> things so it must know an exact percentage of that.  I thought the
> 72-3 done this. Why do they need 5 pens just to know idle and WOT 
> position. My son's 88 golf's digifant II TPS just dose idle and WOT 
> but is
a lot different than the one on our FB.

There's no variable resistor in our TPSs.  For your '72 with 5 pins:

One pin is common

One pin indicates idle position

One pin indicates WOT

Two pins give alternating pulses as the throttle is opening, but not as it closes.

It's a pretty simple system.
--
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

OH ok I guess I was trying to make it harder than it was.  Makes since to me. The whole adjustment procedures makes more since now.  I had it in my head that it worked like one on a modern car because the injectors pulsed with its movement. But I guess it wouldn't need to know the exact % of how far the throttle is open to do that. Thanks Jim!

Dennis 

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