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I saw the video and the car got out of the hole like a bat out of hell. With the engine being very loud, I couldn’t differentiate when the turbos actually spooled up. I was surprise the there was little or no boost lag at all on such a big turbo. It looked like it left the line in full boost. I’m not sure if your definition and mine regarding boost lag “turbo spool up time” are the same. When selecting a turbo, you would need to match it up the output of the motor to the sweet spot on the compressor map of the turbo to get the best efficiency. For example, if 91 mm turbo went on a 4 cylinder car, its small motor output would probably not be sufficient enough to generate 1 lb. of boost pressure until the car got up to 80 mph in order for enough exhaust gas volume and velocity to spin the big turbine. Sometimes when you go with a turbo that is too big for a motor, it could result in slower times. In Lee’s case, he made an excellent choice. I was going to use 88 mm on my car but after seeing Lee’s I’m definitely getting at least 91 or 94 mm.
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