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Originally Posted by darkjedi04
someone recomended i do it to my car(rx-7) instead of turbo because it'd be better for the engine, so I guess that guy is just a moron?
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He's not necessarily a moron. Your engine is the infamous Mazda 13B, a wankel rotary which shares little in common with the reciprocating piston engines in 99% of the cars on the road. There are two major problems with turbocharging a rotary engine:
- Lowering static compression - low-compression pistons are usually not that difficult to find, and you could have them custom made if needed. Low-compression rotors, however, are unheard of, and I don't know of anyone off-hand who fabricates specialty rotors.
- Detonation - Detonation occurs when the temperature inside the combustion chamber becomes so high that the air/fuel mixture explodes instead of burning. Since there is a linear correlation between heat and pressure, turbocharging can cause detonation by raising the dynamic compression. Now, in a piston engine, detonation will rapidly fatigue internal components. In a rotary engine, however, detonation will almost instantly destroy the apex seals. These are the rotary engine's version of piston rings. When these fail, the rotor crashes into the housing, and your engine becomes a big, expensive paperweight.
Safely turbocharging a rotary engine is quite possible, but it's a delicate science. You really need a rotary expert for this. You ought to have a really good engine computer to keep your engine out of the red zone.
Despite the dangers involved, turbocharging a rotary engine can be very rewarding. One of the major downsides of wankel rotaries is the relatively low static compression. A turbocharger can reduce or totally eliminate this disadvantage. Whatever you do, be careful. N/A would certainly be the easier and safer path.