![]() ![]() While Chrysler claimed the engine only put out in the 400hp range, some estimates put it as high as 700+ (some even higher). The Mopar Hemi engine of the 60/70's would fit into this category. Many manufacturers stated one figure when in fact the actual numbers were much higher. Insurance: For insurance reasons, they did the same thing.In actuality they did put out the same HP/TQ, GM just said it wasn't as strong. They would not allow their flagship sports car to have the same output as the mullet-headed freaks were using in their whoopties, so they said the Camaro put out less HP/TQ, while it was exactly the same engine. Politics: In the earlier years of General Motors, they would not allow the Camaro to have as much horsepower as the Corvette.Retard the timing, causing the engine to effectively reduce the compression ratio and increase pumping losses. ![]() It only goes to reason, the other way can affect it inversely. Many of today's fuel injected engines can see modest gains if the correct tune is applied. Be not as aggressive with fuel mapping.By limiting the speed of any engine, you limit the amount of HP produced by the engine. We all know HP is factored on torque and engine speed. Not allow a turbo to produce as much boost.Detune with a Tune With a tune you can:.Not allowing a turbo to produce as much boost with a smaller turbo, or not including a turbo at all (making the engine naturally aspirated).By adding parts which create more restriction, this also reduces VE. As a rule of thumb, every point of compression is worth about 3% in power output. Create the engine with not as much static compression.The end result, not as much volumetric efficiency (VE) and not as much power output. For instance, reducing the lift from one cam to another will not allow as much air to flow into the cylinders. There are several different ways a manufacturer can detune an engine: ![]()
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