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Originally Posted by JLad10687
A turbo works off the exhaust gasses. So if i get a kick ass exhaust and get a kick ass intake and air filter, it will help my turbo kick in sooner? What else can I do to help air flow?
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Very good!
Yes, turbos hate backpressure and stock exhausts with crushed bends, restrictive cats and mufflers, and small tubing create backpressure. Backpressure is a factor that means the more you have of it the harder it is for the engine to push out exhaust gasses. An ideal exhaust system would be a 3" or larger, depending on the size of your engine, mandrel bent exhaust. You will also want a high flow cat and a straight through muffler. Avoid Flowmaster mufflers like the plague. They are horrible for turbocharged applications and have the highest backpressure ratings of most any aftermarket muffler. It’s also a good idea to have the exhaust manifold ported and have the manifold and the downpipe ceramic coated. The ceramic coating helps the exhaust gases exit faster. All this translates into a faster spooling turbo since the exhaust is allowed to exit quicker. You can even go as far to have the head ported to match the manifold and polished with three angle cut valves. All these things will improve airflow. Just be sure to have a professional do your porting since it isn't simply removing material that is important it is removing it from the right places. There can be downsides to doing this. Some cars can start to run lean if you put on a bigger exhaust. You also might have the same problem I do, when I put on my new exhaust I will have to install a three bar MAP sensor and have the ECU flashed since I have an over-boost cutoff. Since the turbo will spool faster it will hit that cutoff faster. These things just depend on the car. On the intake side, simply going bigger isn't always better. For instance, going to a 52mm throttle body on my car does nothing for performance, and in some cases has hurt it. It just depends on the car. It is always a good idea to get an intercooler, the more boost you run the bigger your intercooler should be. Replace the stock piping with a heat soak resistant material if you can or just go with some mandrel bent pipes. Make sure that if you install a new air cleaner that you have the filter somewhere that it can get cold air, for example, the fender. Most places under the hood will result in heat soak and the intake will be sucking in hot air, you want to be sucking in as cold of air as you can.
Like I said, this is subjective for a lot of cars. I would do some research on you car before you go ahead with a project like this and find the best balance in setup. You don't want to go too big or too small on anything. As for getting more airflow, like they say, there is NO replacement for displacement.
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06-24-2004, 02:56 PM
Let me get this straight...
