Hi Mark,
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If you already have a good EBC, then use that to control boost.
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Use the unichip to control fuelling and ignition, and dont use the boost control module.
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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.
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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
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£35 quid which I then used.
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Not a prob as long as it's the same type, as It'll be wiped by the tuner anyway.
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Anyway all you need to know about Unichips From Dino.
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Hi Andy,
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OK, here goes an explanation on the Unichip's boost and other
features.
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.
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.
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Basically, if the Unichip is to control boost, what it does is pulse a
boost solenoid of some kind.
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In the case of the MR2, this is most likely
to be the stock VSV.
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Now, the Unichip itself holds the map for the boost control, which is
just a duty cycle at any given RPM.
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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.
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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.
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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.
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Even thought the Unichip holds the map for the boost control, it
requires a device that will
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"drive" the solenoid.
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This is what the boost
module is.
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Imagine it as a device driver, as the Unichip on its own
doesn't have the power to drive this device.
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Other devices that the
module can be used for are:
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* mappable Water Injection
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* Extra injectors
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* shift lights
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(I think!)
etc
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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.
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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.
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What may have confused Geoff is that the WI map in the Unichip is really
designed to work with systems like the ERL 2c.
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Essentially, the Unichip
will only drive the WI on the induction stroke
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(a clever little touch!).
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The problem occurs when you try to drive another WI system, such as Paul
Port's kits
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(Paul may have changed this though
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- I'm not sure!).
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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.
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Hence, the way we worked around this on mine
was to use the Unichip's boost map to control the WI instead
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(since it
would drive the boost output at all times, not just on the induction
stroke).
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Another thing to explain is that there are 2 types of modules that are
available for the Unichip:
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* one WITH an internal MAP sensor
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* one WITHOUT an internal MAP sensor
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Now, some tuners
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(eg Nobles) use the former so that they can map an
engine that is boosting above the Fuel Cut point.
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Obviously, if you're
running more boost than the fuel cut point, you are having to
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"clamp"
the FC signal, so neither the stock ECU or Unichip see the extra boost
over that FC point.
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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.
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Finally, here's my personal advice, Andy.
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Use the Blitz boost controller
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(it's one of the best around!), and the Unichip will just control
fueling and ignition.
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If at any point you want to run more boost than
the FC point, then use the module.
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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.
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Hope this helps.
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Regards,
Dino
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HTH
Andy