Uhmm... well. I don't think it's going to "overspin" the turbo. But that is just my personal opinion. As for it not "making an airplane sound" it's probably because a lot of turbos won't spool when you just rev a motor. The motor has to be working to put out enough exhaust (ie- driving hard) to propel a turbo. So just finish the system when you get the chance, and after it's all hooked up see if you are getting boost.