The exhaust housing is smaller, so it can spool faster; the T4 compressor housing is larger, which allows it to flow more air without the lag which usually happened in larger turbos.
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The steel turbine wheel is made from the special K alloy to achieve high oxidation resistance and stability under high temperatures up to degrees Celsius. Save my name, email, and website in this browser for the next time I comment. The Engine Get Street Performance Turbo On the other hand, the T4 turbo has a larger turbine on the exhaust side and larger turbine fins on the intake compressor side.
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Contact us: branding maxpeedingrods. About Contact Policy. Each model usually has specs that explain the capabilities and limitations. The bigger the turbine, typically the more air it can deliver at full boost. But the bigger the exhaust turbine is, the more exhaust can pass through easier, reducing back pressure. Larger exhaust turbines are also heavier, having more mass, hence it will take slightly longer spin up to produce build full boost.
According to standard turbo theory, your engine is happiest when the exhaust pressure and intake manifold pressures are identical throughout the RPM range. This matching will produce the best combination of max horsepower and quick spool time. So how do you measure this? For the shade tree mechanic this is difficult. 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.
Everybody wants a fast spool time to get the horsepower to build at the lowest RPM as possible as you accelerate. Turbos are often referred to by "T" numbers that are really a "class type".
These numbers were originally created by Garrett, the largest turbo manufacturer in the world. You have probably heard people talking about T3 and T4 turbos in their car. The T number also specifies a compatible exhaust flange type which the turbo will bolt onto. So when somebody says they have a T3, they are actually saying what class of turbo they have, and the flange type.
Generally speaking T3 class turbos can deliver enough air volume for applications in the to HP range. The bigger T4 turbo has a larger turbine on the exhaust side and larger turbine fins in intake compressor side. This allows the T4 to pump out more air at full boost to achieve more horsepower than a T3, assuming the engine displacement is big enough to provide enough exhaust.
The penalty you pay is a slightly slower spool time, when compared to a T3 on the same engine. T4 turbos are usually for larger motors and use a different exhaust flange.
These turbos use oil-lite bearings to support the turbine shaft, which eventually wears out after years of usage. The length of usage depends on how often the oil is changed, and what type of oil filter used in the engine setup.
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