andre said:
OHhh..thanks...someone else had told me that it causes more heat in the engine...and you say that a good turbo is more efficient...but I dont want to get rid of my header, and change my exhaust again (got 2" piping...damn expensive strumong).
Oh well, as long as I get the facts straight. Thanks.
Turbochargers can increase exhaust gas temperatures more than superchargers do. They can also increase underhood tempeartures.
However, most supercharger systems aren't intercooled, and IMO that offsets any thermal advantages that a supercharger supposedly has. Consider that a roots-type supercharger running 10 psi of boost will have a 160 to 180 degree delta T. This means that your intake manifold temperature on an 85 degree day will be about 245-265 degrees F! A well matched turbocharger will only have about a 115-120 degree delta T, and then a decent intercooler will drop intake manifold temperatures down to the 115-130 degree F range.
Which engine do you think will have bigger thermal problems? The one with the 250 degree F intake manifold temperature (hotter than boiling water!), or the one with a 120 degree F intake manifold temperature? Which motor will be more likely to detonate? Which one will have to run more retarded ignition timing (further driving up EGT's)?
It is true that turbos introduce thermal issues, but a well designed turbo kit (like the F-Max kit for Sentras) and some decent thermal barrier coatings (like Swain's White Lightning or HPC) will keep temperatures down to a reasonable level.
Keep in mind that nobody makes a supercharger kit for your car, but there are turbo kits available. The pain of removing your header and exhaust won't be nearly as great as the pain of developing your own supercharger kit.