Temperature problems on high speed circuit

[JAJ]

I looked through a couple of GT350 tunes and I see nothing for diff. I believe this is a forscan thing. Probably in the BCM.

my friend said, it could be a relay that is defective from the diff. pump?
what do you think?

does anyone know, where the diff. pump relay is located?

Here's the page from the factory service manual. The diff pump is controlled directly by the ECU:

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[K4fxd]

So it's a variable speed pump run by the PCM?

If so the tables are not defined in HPtuners software.

 

[JAJ]

So it's a variable speed pump run by the PCM?

If so the tables are not defined in HPtuners software.

I have SCT Advantage and it's not in there either. I suspect there are a number of ancillary subsystems in the ECU that the tuning companies ignore because they're not engine performance related.

 

[matthewr87]

Schrödinger's Differential Cooler - both on and off at the same time

 

[JAJ]

Schrödinger's Differential Cooler - both on and off at the same time

Hmmm... so you can know how hot it is, but you can't tell whether the pump is on. OR, you can tell if the pump is on, but not how hot it is. Got it.

 

[GT_350]

@JAJ
Thanks for the electronics plan.
My mechanic does not understand the plan. Is there a relay or fuse for the diff. pump?


@matthewr87
what do you mean, "Schrödinger's Differential Cooler"?

 

[K4fxd]

what do you mean, "Schrödinger's Differential Cooler"?

It's a refrence to Schrödinger's cat. A book about quantum physics.

 

[GT_350]

Yesterday I was briefly on the racetrack, because I wanted to know exactly what happens now with racetrack load. ! Note, it is not a high-speed racetrack like Monza !

Differential pump started after a certain time, see video description below.

Since the temperatures have all increased "linearly", not just the differential or transmission temperature, but all together, I think the cooling systems are all working.

Just not on a level like a race car

What do you think?



VIDEO Description:

Note that the car was already warm from the previous stint !
After Stint 1, the car was parked for 20-30 minutes. After that I did Stint 2 (See video)

I could have made 1-2 additional full throttle lapts.
Axle and Engine Oil Temperature would have tolerated it, after that, the "red zone temperature" would have come.

Differential pump has switched on at, approx.:
108/109 °C // 226.4/228.2 °F
(Measured with ForScan, Co-driver was with laptop next to)


Outside temperature:
27 °C // 80.6 °F (not very warm)

Track:
Anneau du Rhin, a small race track 3.7 km. Highspeed straight 220-230 kmh // 136-142 mph


9 minutes full throttle / 5 complete laps

Lap 0) "Warm Up" (car was actually already warm from the previous stint)
Lap 1 - Lap 5) full throttle
Lap 6 - 8) Cool down



Entry Temperature

- Axle Oil - 82 °C // 179.6 °F
- Cyl. Head - 103 °C // 217.4 °F
- Inlet Air - 55 °C // 131 °F
- Engine Oil - 100 °C // 212 °F
- Tans Oil - 64 °C // 147.2 °F


Max Temperature during full throttle

- Axle Oil - 127 °C // 260.6 °F
- Cyl. Head - 119 °C // 246.2 °F
- Inlet Air - 33 °C // 91.4 °F
- Engine Oil - 129 °C // 264.2 °F
- Tans Oil - 83 °C // 181.4 °F


Lap 1 Cool down Temperature

- Axle Oil - 127 °C // 260.6°F
- Cyl. Head - 108 °C // 226.4 °F
- Inlet Air - 33 °C // 91.4°F
- Engine Oil - 124 °C // 255.2°F
- Tans Oil - 83 °C // 181.4°F


Lap 3 Cool down Temperature

- Axle Oil - 117 °C // 242.6°F
- Cyl. Head - 99 °C // 210.2°F
- Inlet Air - 31 °C // 87.8°F
- Engine Oil - 101 °C // 213.8°F
- Tans Oil - 63 °C // 145.4°F


Pitobx Temperature directly after cool down Lap

- Axle Oil - 109°C // 228.2 °F
- Cyl. Head - 109°C // 228.8 °F
- Inlet Air - 39°C // 102.2 °F
- Engine Oil - 99°C // 210.2°F
- Tans Oil - 64°C // 147.2 °F

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