This is the slickest multi-tune option out there for the
tuners of most OBD1 vehicles. Most 1985 - 1995
GM models, 1986 - 1995 Nissan models, 1990- 1994 Mitsubishi
1G models with eprom ECMs or eprom ECM conversions, and 1988 - 1995 Honda
and Acura models utilized 28 pin 8 bit memory devices like
the 27c128, 27c256, or 27c512.
The Multi-tune Adapter installs into the standard 28 pin ROM socket of your
Engine Management Computer, memcal or other memory adapter--anyplace
you would plug in a 27C128, 27c256, or 27c512 ROM. It
allows the use of a 512k ROM (most commonly a 27sf512 these
days) and has
a power input which will switch between the upper and lower
half of the 512k ROM. This allows you to have two
versions of software installed and to switch between them on
The switching is invisible to the engine
management computer and because it uses a power input to
initiate the switch it can be controlled by another
electronic device as well as a simple manual switch.
Common uses are to tune for multiple types of fuels, connect
to boost controllers to allow special tuning at different
boost levels, or to wire to nitrous oxide relays to offer
all your engine control unit's power to you for tuning your
nitrous shot. Wired to your nitrous relays it
will instantaneously switch to your 2nd tune when your
relays open allowing you to put all your fuel in through
your injectors or just fine tune your afr with your wet
shot, customize your ignition timing, etc., etc.
This is the way you want to do nitrous.
Please check the physical constraints of your application
before ordering. This device will add 0.320 inches of
height at the ROM socket and 0.400 inches of height at the
voltage regulator. It is 0.800 inches wide by
2.300 inches long.
If you are a professional tuner, shop, or someone who has
really let his stable of race cars get out of hand we have
these available in perforated/scored sheets of 40, half
sheets of 20, and 1/4 sheets of 10.