My engine has the compression set to 7.5:1. I have not experienced any knock, lots of power and too much heat in the oil. As for my turbo setup, I
have dual egt, 4 CHT, as well as manifold pressure. One quick note to think about when running a Turbo, especially if you are adding a turbo, is some information that a gleaned from a book by B&M Superchargers. Simply adding a turbo will definitely improve the volumetric efficiency, but will not necessarily allow for the most from your turbo/engine combo. They did a test with one of their street blowers, and a stock camshaft, and found that it had 16 pounds of boost (manifold pressure) but only increased the horsepower and torque something like 10 and 15% each respectively. They then installed a off street cam, for normally aspirated motors with close lobe centerlines and lots of duration and lift, and gained just a little bit more, but most was gained very close to the blower's max effective rpm, with boost pressure still showing near 14 pounds. They then designed a cam that took into account the rpm range and the factors that supported a supercharger, and installed it. It had a wider lobe separation angle, and moderate increase in lift and duration and I believe it had a fair amount of cam advance. This cam dropped the manifold pressure down to 10 pounds and raised the horsepower and torque values 40 and 45% as compared directly to the other cams, using the stock as the base for all increases. My point for mentioning this is that when considering an add-on to a stock engine, like a turbo or supercharger, you need to consider the whole engine design package in order to get the most for your money spent. The same amount of air was being pumped into the engine, but the cams, intake valves, and intake manifold determined how much actually went into the engine, and how much stayed in the intake just making pressure. I personally recommend installing complete design packages, where the engine has all modifications made by the turbo designer in order to get best results. Companies like Vortech, and Banks Turbochargers have tech guys that will guide you to what to purchase to get a complete working package that will accomplish what you want. Be wary of the Ebay deals, unless you know what to get and what you WILL get. Often times these people have tried these packages and found them not to work, and so they are selling them to the unwary. Do NOT take the advice of the counter guy at Autozone or Advance or Central Auto Parts or NAPA when it comes to the aftermarket performance parts. If they knew as much as they think they do, they would not be working there... Colin Rainey brokerpi...@bellsouth.net
