16-07-2012, 08:48 PM
You really shouldn't tee into the heater matrix lines, it'll screw up the flow through the cylinder head, more than likely causing all the coolant to go round there rather than through the main cooling system, IMHO it should be teed into the bleed line off the top of the head...
Also, hate to contradict Mark, but welding wastegates shut will produce higher EGTs... The smoke limit is higher than the actual level of boost provided, so say you're making 28psi with the wastegate closed, you could probably open the wastegate, make 24psi, still burn all the fuel, but the EGTs will be lower as there'll be less restriction on the exhaust side... That's why Variable Nozzle turbos work - they affect the restriction of the exhaust, hence I can make my turbo make 40-50psi of boost, but it goes worse than at 20psi because the gasses just stay inside the engine, rather than escaping.
Also, hate to contradict Mark, but welding wastegates shut will produce higher EGTs... The smoke limit is higher than the actual level of boost provided, so say you're making 28psi with the wastegate closed, you could probably open the wastegate, make 24psi, still burn all the fuel, but the EGTs will be lower as there'll be less restriction on the exhaust side... That's why Variable Nozzle turbos work - they affect the restriction of the exhaust, hence I can make my turbo make 40-50psi of boost, but it goes worse than at 20psi because the gasses just stay inside the engine, rather than escaping.
