After speaking to a few FJ guys at Datsun Day, i forgot about important it is to have the correct coolant flow throughout the motor

Considering that the factory turbo is only oil cooled, having the correct plumbing is important, so as to not 'dead head' the flow. Also using the wrong ports for the heater can disrupt the flow.

I downloaded this diagram from the FJ manual, this is how i think the flow should run with a water cooled turbo and heater. I've modified the flow chart down the bottom.

Only downside is the 19mm port on the water pump inlet. it would be nice to have this feeding the turbo with a slightly lower coolant temp, but this would leave the port under cylinder 3/4 nowhere to flow back to.

I've tried to eliminate the use of tee pieces etc. If you've blanked off any ports on your system, best to use a small loop instead.

1 = port below cylinder 3/4

2 = port above left engine mount

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1600 with FJ20 & Simmons. something different.

Are you keeping the coolant lines that run to the throttle body?

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build-threads.com

no mate, just using that diagram/hose to show the flow for the heater.

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1600 with FJ20 & Simmons. something different.

Sorry for digging up an old thread, but didnt want start a new one.
The hard line that runs across the front of the engine above the water pump, then around under the thermostat and under the inlet manifold.
Is this the pipe that goes through the firewall to the heater unit?

Yes, thats the return pipe for the heater and throttle body coolant lines...

Sweet thx bro.