 DOHC
Base TiminG SETUP
Written by Ryan K.
Stock
DOHC base timing is 20 degrees. Click on picture
to enlarge.
I find many people advancing
or retarding or attempting to set base timing to stock
incorrectly. It is proper procedure to pull the TPS after
the motor is warmed up.
Another key point is
to making sure your car is at 700 rpms. The way you do
this is through the idle air screw on the back of the
intake manifold.
After the motor is warm,
turn off the car and unplug the TPS. Then start the car
up and race the motor over and over again to around 3000
rpms and then set the idle to 700-750 rpms. Then shoot
the timing light and rotate the distributor until it
shows 20 degrees (last notch to the right on crank) but
it needs to be at 700-750 rpms. Obviously as you rotate
the distributor, the rpms change as well. After its at
20 degrees, turn the car off, plug the TPS back in, fire
it back up and then it will be considered stock base
timing.
I set my base timing
easily with the use of my MDM Techtom. The MDM Techtom
has a timing readout. After motor is warm, turn the car
off and pull the TPS, fire it back up, race the motor
over, and then just match the crank to whatever timing
number is displayed on the MDM Techtom. After that, I
turn the car off and plug the TPS back in (locks it in
place in ecu) and then my timing is considered stock
base timing. With the MDM, its easy to do this since
all you have to do is make sure the crank and the MDM
show the same number with TPS unplugged.
Either one of these ways
are the only effective ways to do it. When you are advancing
your base timing, it is really important to do it correctly
so you dont end up being 15 degrees advance over or something
crazy like that.
Its easier than i make
it sound through my wording but if you cant do it, hook
it up to CONSULT at Nissan dealership and call it a day.
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