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Originally Posted by jay3000
Kirk. Would not the vast majority of things you listed also have to be done with any forced induction setup?? Are the turbo, and supercharger setups addressing all of these issues or are they just keeping the boost down low and hoping the knock sensors will retard the timing enough to save the engine??
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Yes, with any forced induction setup you'll have to pull timing as the boost pressure increases and it would be wise to have the gauges, etc. (although I would use EGT, boost, and a wide band O2). But with a turbo or supercharger you're pretty much running forced induction all of the time, unlike nitrous, which is just temporary. So with a turbo or supercharger you would re-map the DME or use a piggyback system to control the fueling and timing. You need that any way as you'll need more fuel out of the injectors. With nitrous you don't need a new fuel map as you can simply provide the additional fuel with the nitrous.
Still, even with remapping the DME, you'll have to run at a fairly low boost pressure. It's tough. People get greedy (just as with nitrous) and end up turning it up to get more.... As a result you see a lot of people who buy the turbo or supercharger kits and then suddenly want to sell their cars within 6 months...
Obviously there are a couple exceptions on this board where boost has worked well for them, over the long haul.
Hoping the knock sensors will retard the timing is a big hope. I personally wouldn't count on it. Even the Knock Link is wishful thinking. The problem is that once detonation hits, if it hits hard enough, fast enough, it may be too late to react whether it's by lifting the throttle when you see knock on a Knock Link or whether it's by the DME pulling timing.
Kirk