Hi everybody,
I am close to finishing my EFR turbo build on my S2 3B. I did a few test drives tuning the car, but my coolant temperature always got too high. Cruising at 2000rpm caused a CLT temp of 102°C (measured in the cylinder head, G62 sensor).
Setup:
S2 3B, EFR turbo, custom intake and exhaust manifold, EMU Black ECU, stock cooling setup with AC condenser.
Troubleshooting so far:
- EGT is fine- 350-400°C in idle, max. 650°C when cruising
- replaced coolant, water pump, thermostat, G62 CLT sensor
- made sure cooling fan spins up
- bled the cooling system at the main cooler and the hose for the heater core
- made sure all coolers are getting hot
- made sure the timing is on point
- made sure calibration in the ECU is correct
- did a co2 test on the cooling system --> liquid turned form blue to green
- possible faulty head gasket or crack
- --> tore the engine apart
- didn't see any exhaust gas paths on the flat surfaces or on the gasket
- didn't see any lighter spots in the engine, which water would cause
- checked block and head with a straight edge and feeler gauge -> both very flat, my 0,05mm feeler gauge didn't fit at all
- didn't see any cracks in head, exhaust port or block
I'm not even sure the positive co2 test is the cause of the hight CLT temps. But don't want to assemble the engine and still have the same problems. Do you have any tipps on what to do next?
Thanks!
I am close to finishing my EFR turbo build on my S2 3B. I did a few test drives tuning the car, but my coolant temperature always got too high. Cruising at 2000rpm caused a CLT temp of 102°C (measured in the cylinder head, G62 sensor).
Setup:
S2 3B, EFR turbo, custom intake and exhaust manifold, EMU Black ECU, stock cooling setup with AC condenser.
Troubleshooting so far:
- EGT is fine- 350-400°C in idle, max. 650°C when cruising
- replaced coolant, water pump, thermostat, G62 CLT sensor
- made sure cooling fan spins up
- bled the cooling system at the main cooler and the hose for the heater core
- made sure all coolers are getting hot
- made sure the timing is on point
- made sure calibration in the ECU is correct
- did a co2 test on the cooling system --> liquid turned form blue to green
- possible faulty head gasket or crack
- --> tore the engine apart
- didn't see any exhaust gas paths on the flat surfaces or on the gasket
- didn't see any lighter spots in the engine, which water would cause
- checked block and head with a straight edge and feeler gauge -> both very flat, my 0,05mm feeler gauge didn't fit at all
- didn't see any cracks in head, exhaust port or block
I'm not even sure the positive co2 test is the cause of the hight CLT temps. But don't want to assemble the engine and still have the same problems. Do you have any tipps on what to do next?
Thanks!
Comment