Hi Mark,
If you already have a good EBC, then use that to control boost.
Use the unichip to control fuelling and ignition, and dont use the boost control module.
I was in exactly the same situation as you, and learn't so much from Dino about Unichips I hope he won't mind me quoting him below.
I bought a ex mr2 unichip and boost control module for a lot of money, then sold it and bought a ex 200sx unichip for about
£35 quid which I then used.
Not a prob as long as it's the same type, as It'll be wiped by the tuner anyway.
Anyway all you need to know about Unichips From Dino.
.
.
.
.
Hi Andy,
OK, here goes an explanation on the Unichip's boost and other
features.
.
.
Basically, if the Unichip is to control boost, what it does is pulse a
boost solenoid of some kind.
In the case of the MR2, this is most likely
to be the stock VSV.
Now, the Unichip itself holds the map for the boost control, which is
just a duty cycle at any given RPM.
It is NOT closed loop, but if set
properly, should work pretty well, although it won't compensate for
different conditions like some good closed loop aftermarket boost
controllers.
Also, since you don't have access to change any of the
settings in the Unichip, it means that you have to have a remap just to
make a change to the boost.
This isn't a bad thing, as it means that you
can get the car set up properly each time, but it isn't as handy as most
aftermarket BCs.
Even thought the Unichip holds the map for the boost control, it
requires a device that will
"drive" the solenoid.
This is what the boost
module is.
Imagine it as a device driver, as the Unichip on its own
doesn't have the power to drive this device.
Other devices that the
module can be used for are:
* mappable Water Injection
* Extra injectors
* shift lights
(I think!)
etc
Geoff was incorrect in saying that, if you use the Blitz controller for
boost, this would free up the output from the Unichip so that you can
drive other devices.
The Unichip has separate maps for WI and boost, so
you can run both simultaneously, although you'd need one module for each
device you want to drive.
What may have confused Geoff is that the WI map in the Unichip is really
designed to work with systems like the ERL 2c.
Essentially, the Unichip
will only drive the WI on the induction stroke
(a clever little touch!).
The problem occurs when you try to drive another WI system, such as Paul
Port's kits
(Paul may have changed this though
- I'm not sure!).
Basically, with Paul's original systems, the Unichip would only drive it
on the induction stroke, and hence you weren't able to get the full flow
of water that you'd want.
Hence, the way we worked around this on mine
was to use the Unichip's boost map to control the WI instead
(since it
would drive the boost output at all times, not just on the induction
stroke).
Another thing to explain is that there are 2 types of modules that are
available for the Unichip:
* one WITH an internal MAP sensor
* one WITHOUT an internal MAP sensor
Now, some tuners
(eg Nobles) use the former so that they can map an
engine that is boosting above the Fuel Cut point.
Obviously, if you're
running more boost than the fuel cut point, you are having to
"clamp"
the FC signal, so neither the stock ECU or Unichip see the extra boost
over that FC point.
By using the internal MAP sensor of the module, the
mapper can use the reading from that MAP sensor to give better
resolution when mapping at boost levels above Fuel Cut.
Finally, here's my personal advice, Andy.
Use the Blitz boost controller
(it's one of the best around!), and the Unichip will just control
fueling and ignition.
If at any point you want to run more boost than
the FC point, then use the module.
Also, this module can be used to
drive any other device that you might need in the future, eg WI or even
an additional injector.
Hope this helps.
Regards,
Dino
HTH
Andy
](./images/smilies/eusa_wall.gif "Brick wall"){kind=small}