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These turbos use oil-lite bearings to support the turbine shaft, which eventually wears out after years of usage. T3 and T4 turbos have been around for a long time and offer great value. T4 can deliver enough air for applications in the 400 to 600HP range. T4 turbos are usually for larger motors and use a different exhaust flange. The penalty you pay is a slightly slower spool time, when compared to a T3 on the same engine.
2011 scion tc turbo kit for sale full#
This allows the T4 to pump out more air at full boost to achieve more horsepower than T3, assuming the engine displacement is big enough to provide enough exhaust. The bigger T4 turbo has a larger turbine on the exhaust side and larger turbine fins in intake compressor side.
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Generally speaking T3 class turbos can deliver enough air volume for applications in the 200 to 300HP range. So when somebody says they have a T3, they are actually saying what class of turbo they have, and the flange type. It’s important to understand there are many different types of T3 turbos with different air outputs which are rated for different horsepower applications. The T number also specifies a compatible exhaust flange type which the turbo will bolt onto. The “T3” number is a general CFM classification. You have probably heard people talking about T3 and T4 turbos in their car. These numbers were originally created by Garrett, the largest turbo manufacturer in the world. Turbos are often referred to by "T" numbers that are really a "class type". That’s the tradeoff you need to consider, horsepower versus spool time. So the thing to keep in mind is to select a turbo that has a small enough turbine to spool up quickly, but big enough to pump enough air to support the maximum horsepower you’re targeting to achieve. That's where you depend on Outfront to recommend the best turbo setup to achieve your target horsepower, based on your engine setup and displacement.Įverybody wants a fast spool time to get the horsepower to build at the lowest RPM as possible as you accelerate. So how do you measure this? For the shade tree mechanic this is difficult. This matching will produce the best combination of max horsepower and quick spool time. The length of this spin up process is called “spool time”.Īccording to standard turbo theory, your engine is happiest when the exhaust pressure and intake manifold pressures are identical throughout the RPM range. Larger exhaust turbines are also heavier, having more mass, hence it will take slightly longer spin up to produce build full boost. But the bigger the exhaust turbine is, the more exhaust can pass through easier, reducing back pressure. The bigger the turbine inside, typically the more air it can deliver at full boost. Each model usually has specs that explain the capabilities and limitations. Turbos are rated based on how much air they can deliver. Here we’ll explain the basics to understand the technology a little better when selecting your next turbo for your projector car. There are literally hundreds to choose from. Turbochargers come in many sizes and physical orientations for all kinds of applications.