Down Timer 2 (CDT)
Shutting your engine down after a heavy haul when the exhaust
gas temperature (EGT) is above normal can result in turbo
bearing damage-but now you can protect your turbo with BD's
Cool Down Timer (CDT). The CDT works with any K-Type EGT probe
commonly found in most pyrometer gauge kits and has adjustable
shut down temperature setting. Plus, five-minute timeout and
quick shut down functions. The new design of the CDT adds
increased troubleshooting ability and new installation features
plus the ability to work with vehicle security alarms and
in reducing regeneration of the DPF on 2008-up vehicles.
Engine Shutdown (CES)
The CES works in conjunction with BD's own X-Monitor digital
gauge package, connecting between the control module and display.
What Is The Cool Down Timer 2 (CDT2)?
The CDT2 is designed to keep the engine running when the ignition
key is turned off and the exhaust temperature is above a set
point (between 250-550°F) to prevent turbocharger bearing
failure that could occur when the engine is shut down too
A typical turbocharger can spin in excess of 100,000rpm under
load, which will continue spinning when the engine is turned
The turbocharger is lubricated and cooled by the engine oil,
and when the engine is turned off, that oil supply is cut
off. If a turbocharger is still spinning at a high RPM when
the oil supply is cut off, the internal bearings will utilize
what remaining oil is around them then start to heat up -
essentially cooking the oil, which causes premature bearing
failure. By allowing the turbocharger to slow down to a safe
RPM, this bearing failure can be prevented.
A very efficient means of gauging a safe time to turn the
engine off is by the exhaust temperature. The suggested temperature
range to go by is below 400°F (with the thermocouple mounted
post-turbo). The further away the probe is away from the turbocharger,
the lower the shut-off temperature should be. If the thermocouple
is mounted pre-turbo, then the shut-off temperature can be
How Does The Cool Down Timer 2 Work?
The CDT2 module utilizes the signal from the thermocouple
that is measuring the exhaust gas temperature. The thermocouple
may already be connected to a gauge or it can be connected
to the CDT2 module on its own.
When the key is turned off and the exhaust gas temperature
is above the shutdown setting, the CDT2 module will keep power
supplied to the ECM/PCM, which in turn will keep the engine
running until the temperature falls below the setting.
As well a new feature of the CDT2 is to shut the truck down
based on an adjustable time. This time is adjustable using
the potentiometer on the side of the control unit.
The CDT2 module has a few safety features built-in that the
driver should be aware of. If for some reason the exhaust
gas temperature does not fall below the shutdown setting within
five (5) minutes from the key being turned off, the CDT2 will
automatically shutdown the engine.
As well if the engine starts to initiate a REGEN cycle causing
the EGT’s to rise the CDT2 will shut the truck off.
The CDT2 module is also designed to monitor the vehicle’s
hydraulic brakes when it is connected to the brake pedal switch
via the Brake Pedal terminal on the module. While the CDT2 module
is keeping the engine alive (ignition key turned off and exhaust
gas temperature above the shutdown setting), if the brake pedal
is depressed the CDT2 will shutdown the engine. This was implemented
to protect the vehicle from being stolen when the engine is in cool
down mode; eventually the brake pedal would have to be pressed which
will shutdown the engine preventing the thief from easily driving
away with the vehicle. This is also useful in situations where the
engine needs to be shutdown immediately or is desired to be shutdown
Turbo Cool Down Timer Features:
Your BD Diesel
Performance Cool Down Timer is covered by a 1-year warranty
instructions included with your Turbo Cool Down Timer; installation
time varies by truck
the ignition, lock your doors and leave it running—BD’s
Cool Down Timer takes care of the rest
Cool Down Timer connects to any K-type EGT probe that’s
common with most pyrometer kits
motor runnin’, allowing your EGTs to drop to safe levels
before shutting down
The BD Diesel
Performance Cool Down Timer saves your diesel truck's turbo from
the perils of high-heat damage after hard runs