u need tuning because, with a turbo ur going to be pushing more air into the engine, now what controls the amount of fuel? the ECU..so u need it reprogrammed to add the proper amount of fuel, to the amount of air that goes in...so u maintain a bigger version of ur previous a/f ratio...having more air and less fuel will cause ur engine to run lean, thats why u tune it.
your saying ur dads turbo diesel doesnt have all that? well think about it..without the turbo raising the compression, the diesel's compression is small..it NEEDS to the turbo to run normal, it doesnt have a big intercooler cuz u dont need one, and then it DOES have a tuned ECU, but mercedes has these pre-programmed like any other ECU for their cars.
no more than 8psi ever? trust me...u will have 8psi..then get bored of the power, like your bored of your current power. if you want something with no lag, and less maintance, get a supercharger.
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