Re: knock sensor

[kdbinney@juno.com (Kyle D Binney)]

>On your Mk1, did you change anything in the fuel or ignition systems, 
>or did you just drop in a 1.8 longblock?  I am guessing from your 
>question that you just did the longblock.  Is it a solid lifter 1.8 
>9:1CR (like stock '83-'84 GTI) or hydraulic lifter 1.8?  Hydraulic 
>lifter 8v 1.8's came in two CR's.  8.5:1 in A2Golf/Jetta & 10:1 in 
>A2GTI/GLI.


Grassroots motorsports said rabbits were 8.5:1, which I believe is
correct.  anything 9:1 or over should have the sensor.

>
>If you are running the 10:1, I suggest fitting the knock sensor 
>ignition.  It is easiest to obtain from an '87 GTI or GLI.  Many of 
>the parts are common to other years and cars, but everything you need 
>should be available in an '87.  Some CIS-E cars do not have separate 
>control boxes for the injection and ignition systems.  I believe that 
>the '85-'87 GTI/GLI all have separate boxes.  From '88 and up, it 
>varies.  Some parts can be sourced from Audi 4K if you have trouble 
>finding everything.
>
>You need:
>
>Knock Sensor ignition control box.
>Knock sensor (~1" doughnut shaped thing between #1 & #2 cyliders on 
>front of block)
>Distributor (does not have a vacuum actuator on it)
>Throttle body switch assembly
>
>If you don't already have an electronic ignition, add in:
>
>Ignition amplifier (any A1/A2/Audi with electronic ign)
>heatsink/bracket that the amplifier mounts to
>Coil (again from nearly any VW/Audi electronic ign)
>
>I like to use the sparkplug wires that do not have the locking ends, 
>so I use the early style cap (pre 85) on the late model distributor.  
>All the pieces go together pretty logically if you have the wiring 
>diagram from the A2 Bentley manual.  If not, New Dimensions has a 
>schematic on their website www.newdimensions.com
>If you can get the wiring harness out of your donor car, it even stays 
>color coded throughout.  If the harness is from '85-'86, you need to 
>change one wire.  Seems the control box holds two different ignition 
>maps, one intended for VW's transverse layout, and one for Audi's 
>longitudinal layout.  Audi's gives a little more power (2hp).  
>Starting in '87, VW started using the Audi map.  That's why the 
>'85-'86 GTI spec was 100hp, but in '87- it was 102hp.

86 had the 102 hp map, that I am positive of.  only 85 came with the 100
hp, and all you need to do is cut one wire.

>
>I have mixed opinions about what sparkplugs to run.  The stock Bosch 
>WR7DTC is a superior plug based on seat of pants driving feel, but 
>wears quickly and (at least with the setup I run in my Jetta) gives 
>poor emissions reading at idle (lots of unburnt HC).  The Bosch 
>Platinum does not seem to have the top end power of the triple 
>electrode copper plug, but gives nearly zero HC and CO at the tailpipe 
>under idle and dyno testing.
>
>If you want more information about the KS conversion, drop me a line.
>
>Mike
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