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ST165 VPC Installation
Here is a few notes about ST165 VPC installation. There is no
harness for the ST165 so it MUST be hardwired. There are a few extra
notes here that are not covered on ST185 installation. Note that a
Supra 87-88 VPC harness can be converted to work for the ST165, so that
you don't have to splice into your wiring. Please see me for more
explanation.
ITEMS REQUIRED:
HKS VPC Unit
MR2 Stock Injector chip for VPC
HKS VPC Air temperature sensor
HKS VPC 3 Bar Map Sensor
Resistor for Air Temp Mod
Wire Taps or ability to solder to existing wires
Some way to turn on fuel pump
ECU PINOUTS:
WIRING SCHEME:
|
VPC WIRE COLOR |
ST165 WIRE PINOUT |
|
WHITE |
IGT (IGNITOR) |
|
BLACK |
E1 |
|
YELLOW |
VS (AFM) |
|
RED |
+B |
| |
|
INSTALLATION:
Just tap the wires! You won't cut the
AFM (VS) signal since when you remove the AFM there will be nothing going
to that signal wire. The VPC yellow wire will then send the signal
to the VS wire.
A
resistor must be installed between the THA (air temp sensor) and E2
(sensor ground). See this page for more details on that mod.
CLICK HERE
The air temperature sensor must be installed after the IC. The
throttle body is the ideal location. This will require drilling and
tapping of the throttle body. You can also use the intake manifold
if desired. This is where the supra TT guys put their air temp
sensor and we can see it works out great for them.
The map sensor for the VPC must have a source directly from the manifold.
You can tap into any line coming directly from the manifold. Be sure
to use the filters included with the kit, so that dirt does not find it's
way into your expensive sensor.
Note: The AFM on the ST165 also turns on the fuel pump. You
need some way to turn on the fuel pump once the AFM is removed. For
testing, you can turn on the fuel pump manual by bridging the +B and FP
ports of the diagnostic box. But you need some way for the fuel pump
to be turned on when your car is started. You can wire the fuel pump
to be on with IGN on, but remember that this will make the fuel pump
always on when you are driving. This is great, but if you crash, the
fuel pump will still be on and can possibly be dangerous. Seek help
if you would like to make a proper fuel pump switch that will be safe.
If you do turn it on this way, at the very least make some sort of fuel
cut off switch accessible by the driver in the event of an accident.
TUNING:
Tuning should be performed by a person
familiar with VPC, hopefully a professional. You can ruin your
engine by "playing" with the knobs. Set all to zero and start the
car without the AFM. It will take a little while, but it will settle
down smooth idle. If the idle is rough you can use the idle
adjustment knob. You might find that the idle must be adjusted at
times depending on ambient conditions.
Click here to view
the actual HKS VPC documentation and notes
An MR2 owner noted on his relatively stock
car that these settings started him out best:
Response -2
Gain -1
Idle +3
GAINS:
Many have asked about the gains associated
with removing the AFM. There is no correct answer. It depends
on your car. If you have a turbo upgrade, or are running a lot of
boost, the gains will be higher. For example, if you put a VPC on a
stock car, the gains would be very little. Just know that it's
always GOOD to remove the afm. Some have reported gains around 20
hp, depending on their mod level.
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