Blog — precision turbo

Courtesy of TurbobyGarrett.com ( http://turbobygarrett.com/turbobygarrett/compression_ratio_with_boost ) Before discussing compression ratio and boost, it is important to understand engine knock, also known as detonation. Knock is a dangerous condition caused by uncontrolled combustion of the air/fuel mixture. This abnormal combustion causes rapid spikes in cylinder pressure which can result in engine damage. Three primary factors that influence engine knock are: Knock resistance characteristics (knock limit) of the engine: Since every engine is vastly different when it comes to knock resistance, there is no single answer to "how much." Design features such as combustion chamber geometry, spark plug location, bore size and...

More Great Turbo Tech from www.TurbobyGarrett.com There are two different types of turbocharger manifolds; cast log style (see Figure 3.) and welded tubular style (see Figure 4.).    Manifold design on turbocharged applications is deceptively complex as there many factors to take into account and trade off . General design tips for best overall performance are to: Maximize the radius of the bends that make up the exhaust primaries to maintain pulse energy Make the exhaust primaries equal length to balance exhaust reversion across all cylinders Avoid rapid area changes to maintain pulse energy to the turbine At the collector,...

Courtesy of www.TurbobyGarrett.com A/R (Area/Radius) describes a geometric characteristic of all compressor and turbine housings. Technically, it is defined as: the inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centerline to the centroid of that area (see Figure 2.). Figure 2. Illustration of compressor housing showing A/R characteristic   The A/R parameter has different effects on the compressor and turbine performance, as outlined below. Compressor A/R - Compressor performance is comparatively insensitive to changes in A/R. Larger A/R housings are sometimes used to optimize performance of low boost applications, and smaller A/R...

The release of these three new turbos, the GTX3071R, the GTX3076R and the GTX3582R raises the bar for mid-frame turbo performance. More BOOST and additional FLOW without losing BOOST RESPONSE is result of extensive research and development of a new and more aerodynamic profile of compressor wheels. The GTX3076R can now flow nearly 65 lb/min and the GTX3582R has the potential to do over 750HP in the compact familiar external package of the standard GT turbos we've grown to appreciate. You do not have to change your turbo kit arrangement! While Garrett by Honeywell is currently the industry leader and...