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Hi,
I have two 240 turbo cars and quite a lot of expertise with them. Sounds like you would like to increase the power of the car but have questions about how soound the whole thing is. I would suggest you make sure aren't about to make the mistake of trying to get maximum power out of a worn motor and turbo. You'll end up with a smoking heap of crap if you aren't careful. Do a compression check of the motor first. Change the oil and the air filter. Use 15w/50. Remove the intercooler and wash it out with hot water and a good degreaser. Remove the intake air hoses and wash the turbine with hot water. Reach into the turbo and wiggle the impeller. If it moves 1/4 inch, time for new turbo. Blow everthing dry before reassembly. Now you have a clean intake system, with an air filter that will pass plenty of air with causing excessive vacuum in the intake which can suck oil past the seals in the turbo. Run the car for 3000 miles, then open up the intake hoses. If they're soaked in oil, the turbo is worn. If the oil smells of gasoline, and the compression is down on two adjacent cylinders, the head gasket may be leaking. If the compression is good, the engine may be running rich and mixing fuel into the engine oil. Are there any other symptoms, big or small??? Does the motor smoke? If so, what color is the smoke? How many miles on it? What's the gas mileage? Does the turbo guage go into the yellow? Hope this is helpful.
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