RE: Bottom End Performance Mods

[Robert Malinka <rmalinka@spec.net>]

At 10:06 PM 10/5/98 -0700, you wrote:
>In a turbo you have lag.  It may not kick in until 3500 rpms.  

Depends on size of turbo and what rpm it's designed to kickin at.  
The 1.8T engine is a low boost turbo that comes on at very low speed.
This gives the engine a broader power curve, however, it's not as strong
as higher boost turbos.

>A supercharger starts about 200 rpm all through out the spectrum.  

Turbos run off the exhaust and supercharger run off the engine. 

>It does not require a intercooler in most cases.  A turbo has to be cooled
by a 
>intercooler (in most cases)  this means when you get out of your car you 
>have to let it idle until your turbo is cool.  If you don't you will 
>seriously take the life away from it.  

There's a little confusion here gentlemen, the intercooler merely cools the
air coming into the turbo, it has nothing to do with cooling the turbo
itself.  If you have a turbo a cool down idle or just driving slower before
you shut down is a good idea to prevent coking of the bearings and release
some of the thermal loading. However, most turbos today will utilize
synthetic oils to prevent this and will have a water jacket with an
auxillary pump and thermostat, which will run after the engine is shut down.


Bob
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