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Jamie, I can only offer advice about the LPT vs. Reg. turbos. LPT stands for "light pressure turbo". A light pressure turbo is somwhat smaller than a "regular" turbo, Like a Garret T-3. Turbos are driven by the exhaust that your engine makes, which spins the turbine to provide boost to your engine. This means that your turbo spools up quicker, because it requires less exhaust to get it working. The main benefit is that a LPT has less turbo "lag"(time that is starts working). Your turbo gets working a lot faster. A bigger turbo cannot really start working good until your rpms get up pretty high (exhaust exiting very fast). The main drawback (only if you have a very heavy foot) is that a LPT "tops out" faster in that it gets to its maximum boost threshhold faster than a bigger turbo, so it makes somewhat less boost. There is a lot of really good info at www.turbobricks.org (not sure if that is the right address or not) that goes into a lot more detail than I have. I know that you more than likly know most of this already, so my apologies if I told you what you already knew.
As for letting your engine run, I do not know. I have a '84 245 with a T-3 Turbo and I do have to let mine run about a minute because it is cooled by the oil, which will cook if it is shut off right away. If yours is water cooled (i think it is) then I do not think that you need to let it run.
Just my .02 worth, Robert
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