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How Turbo's Work

Click to go to Turbo Fundamentals

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By: Dennis Grant dg50@chrysler.com
June 1997
Subject: Turbo Fundamentals -
 
How Turbos Work
 
(or: The Closest Thing to a Free Lunch)

Enter the turbocharger, a turbine fed by exhaust gasses, connected to a compressor via a shaft that compresses intake air into the engine. More air in the cylinder means more fuel can be burnt per power stroke, more burnt fuel means more hot gas, more hot gas means more power - and more boost too.

This is the closest thing to a free lunch you'll find in engineering, because you're taking heat (energy) that would otherwise be wasted and getting usable work out of it, with almost no tradeoffs. You gain a little complexity, and added manufacturing costs, but there is no real performance hit from adding a turbo. There are many ways to save money while doing modifications and power ups, and that is what the this info is all about. I would be one of the most cost conscious rev heads around but some (most) times you have to spend money (wisely) to make power. Obviously the more you can do yourself, the cheaper any modification becomes. If you know exactly what needs to be done, paying someone else to do just that also saves money. It's when you are unsure of what is required to be done to achieve your goals that leaves you open to exploitation.

I am constantly amazed at photo's in magazines showing great cars that have the exposed fancy foam filter under the hood that obviously sucks all that hot air from the radiator (and intercooler dependent on turbo or not). These cars are not getting any benefit from the foam filter if they are sucking air 50 degrees or more over ambient or outside air temperature.
From tests conducted with temperature sensors in various locations it shows that this can definitely increase the temperature of the boost air entering the cylinders by a significant amount.
Possibly even enough to cause detonation under some circumstances.

NEXT:-  Turbo Fundamentals Pg 1.

BEFORE ANY TURBOMODS

CONTENTS
Click Image to go to information
To MODIFY or NOT
DETONATION
Pre-ignition & Fuel
Fuel Volume & Pressure
Air Supply
Exhaust & Heat
Lubrication
Cooling & Water
Breathing
Boost
Modification Sequence
Conclusions
 

CONTENTS
Click Image to go to information
AIR FILTERS
DUCT COLD AIR
SPARK PLUGS
INCREASE BOOST
FUEL ENRICHMENT
INTER COOLING
 

  

The Ideal Gas Law.

In short, gas temperature, pressure, and volume are all related. Compress a gas (reduce the volume) and pressure and temperature goes up. Let it expand, and temperature and pressure go down. Increase the temperature, and the pressure goes up (in an enclosed space) or the volume goes up (it expands).

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AIR FILTER

Replace AIR FILTER with Alternate type.

As mentioned, the foam type air filter seems to have been proven in racing and extreme power conditions by allowing much better air flow while still doing its job of removing dust, dirt and grime from harming your sensitive high speed turbo and engine internals.

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  From discussions with many Turbo owners, I have found that some want to retain the factory performance, while others want to make major modifications for the full power potential of their Turbo Vehicle.
( typed car but changed it, because you may have a Van or 4WD as some of our RTO's do.)


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 This page was last updated on 19-Mar-2009 18:34.

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