Nissan 370Z Forum - View Single Post - Looking for Input: 370 Motorsport Data Logger

MotorvateDIY · 03-22-2025, 02:04 PM

Well.... I like it when the data results match, as it gives me confidence that the math and programming is correct!

I'm going to do a special version of the GTR gauges and will re-purpose the "Trans Oil Pres" gauge to show ECP (engine coolant pressure... new acronym!) for this afternoon's longer test drive.

As for the temp drop at high RPM:
Since the stock thermostat starts to open at 82C / 180F and isn't fully opened until 95C / 203F, the rad will have "cooler" coolant until the entire system is 95C / 203F.

Keep in mind, the thermostat acts like a "blend door" and controls the "mix" of recycled (hot) coolant and cooler (rad) coolant UNTIL all the coolant is at 95C / 203F or more.

With the 17mm restrictor plate, you will heat up all the coolant at the same time, which will take longer but will eliminate the temp drop.

However, from a knock perspective, having the engine coolant 4C/7F cooler at WOT isn't a bad thing.

Anyways, that's my theory!

03-22-2025, 02:04 PM	#30 (permalink)
MotorvateDIY Base Member Join Date: Nov 2016 Location: Toronto Posts: 232 Drives: G37 Sport Rep Power: 6789	Well.... I like it when the data results match, as it gives me confidence that the math and programming is correct! I'm going to do a special version of the GTR gauges and will re-purpose the "Trans Oil Pres" gauge to show ECP (engine coolant pressure... new acronym!) for this afternoon's longer test drive. As for the temp drop at high RPM: Since the stock thermostat starts to open at 82C / 180F and isn't fully opened until 95C / 203F, the rad will have "cooler" coolant until the entire system is 95C / 203F. Keep in mind, the thermostat acts like a "blend door" and controls the "mix" of recycled (hot) coolant and cooler (rad) coolant UNTIL all the coolant is at 95C / 203F or more. With the 17mm restrictor plate, you will heat up all the coolant at the same time, which will take longer but will eliminate the temp drop. However, from a knock perspective, having the engine coolant 4C/7F cooler at WOT isn't a bad thing. Anyways, that's my theory! Last edited by MotorvateDIY; 03-22-2025 at 02:59 PM.