Clutch Cut Wire Install - 1990 DSM
This video was shot as an illustration of the steps that I took to install
a clutch cut wire onto a 1990 DSM. I received a request on this particular
project, so I shot the video to clear up any confusion that still may be
When installing the clutch cut wire, the goal is always the same, make the
ECU see a ground when the clutch pedal is depressed. For 91+ models, a
clutch cut wire was produced by ECMlink. This wire allows users to install
it and maintain the functionality of the cruise control switch while
gaining the added benefit of No Lift To Shift (NLTS). If you own a 90 model
DSM this wire will not work for you.
Just like the ECU, Tach, and other parts of a 90, the cruise control switch
is wired differently than 91+ models. The cruise control switch on a 90 is
switched to a 12v line while 91+ models are switched to a ground. The
programming inside link wants to see a ground, so simply installing the
supplied orange and violet ECMlink wire will not do the trick.
Another drawback to doing this mod on a 90 is that you will loose the
functionality of the cruise control switch. It will no longer disengage the
cruise control when the pedal is depressed!!!! This is not an issue for
some people because they have already deleted the cruise control but for
those of you looking to retain that functionality there is hope. The
process of retaining the function of the switch will not be covered here
and is a lot more involved. You can find those instructions in the 2nd link
Setting up NLTS in ECMlink is exciting, but there are a few things that you
should know. When setting up the limiter, you can not just blindly guess.
You must make a pass (on the drag strip of course) without the mod, banging
through the gears as you normally would. Review the log and see where the
RPM's drop back to during each shift. You want to choose an RPM very close
to this number.
For instance. If you rev the car to 7500 and your shift from 1 to 2 dropped
to 5400 2 to 3 dropped to 5500 and 3 to 4 dropped to 5500 you would want to
set the limiter to 5500 or so. This will closely match the revs between the
flywheel and clutch disk when re-engaging the gears. Ironically, you will
find that the revs drop to about the same spot IF you rev the car to the
same RPM in each gear. Of course, revving the car higher or lower will
result in a different reading.
Learning to use this new feature can be a real learning curve. If you do
not lift your foot completely off the clutch you effectively lower your
redline to your clutch cut limit. If you do not keep your foot 100% on the
throttle NLTS will not work. On the other hand, if you use this mod as it
is intended and you spend the time setting it up the reward will be well
worth the effort.
I hope that this helps you understand the difference between the 90 and 91+
model clutch cut wires.
This page contains a PDF on how to install the clutch cut wire on a 91+
This page contains the methods of installing the wire onto a 90 model.
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