Turbochargers: GT vs. T
What's the Difference?

Turbocharger technology has advanced during the recent years, and at the forefront of that
wave has been Garrett, leading the charge of modernization at the OEM level. One notable
advance at the OEM's has been the shift from the traditional T-turbocharger to modern GT
technology. Older 'T' products served as a workhouse for the aftermarket for many years, but
now Garrett GT will revolutionize turbocharger performance and enable the reduction of turbo
lag to virtually undetectable levels.

The GT Evolution

In the 1990's Garrett engineers developed a radically new efficient turbocharger baptizing it
'New Garrett Technology' aka the 'NGT' turbo. Over time the term was shortened to 'GT' and is
now used to specifically describe the aerodynamically advanced Garrett turbochargers that
cause the turbo to spool up to boost and accelerate your vehicle quicker than ever.


Product Simplification - T product typically contained 54 components, compare this with GT
technology which has drastically reduced the number of components by more than 45% to
average of 29! Reducing the number of individual parts drastically diminishes the opportunity
for failure, thus resulting in smoother motoring.

Journal Bearing - The bearing system in the GT turbocharger allows for improved shaft stability
and less drag throughout the speed range. In fact, the GT shaft motion has decreased by 20%,
which greatly improves the durability of the bearing system.

Thrust Bearings - The new GT turbochargers have an increased load bearing capacity of up to
35%. This provides greater resistance to thrust bearing failure, especially when the
combination of an oversized compressor wheel to turbine wheel is used.

Improved Aerodynamics - The wheels used on the GT turbochargers increase the efficiency of
the turbocharger system. Increased efficiency allows improved engine performance in each

Wheel Trims - The GT range has several more wheel trims that the T range, enabling a more
accurate match of turbocharger to engine that will in turn result in optimum performance.

Piston Rings - The piston rings on the GT range are made from M2 tool steel. This material can
withstand higher temperatures than traditional T range piston rings, making the GT product
more appropriate for today's modern engines

Information Provided By: Garrett Performance Products
Turbochargers, K-27, Garrett GT-35 R, T-66, T72 with T-4 turbine housing
T-72 with T-4 turbine housing on the modified 930 header.
T-72 is good for 850 HP but the engine is only good for 600HP, boost does not kick in till 4000
RPM. GT-35 R will be better match.
Garrett GT-35R good for 600 HP
AN-4 Oil inlet fitting for GT Ball Bearing turbos. For GT35R with built-in oil restrictor. Custom
machined part. Output is -4 AN male flare. Use with any of our -4 oil feed line assemblies

Drain flange adapter kit allows original KKK K26 K27 T3 or T4 flanged oil drain line to be
used when switching to GT BB turbo. Flange, O-rings and Bolts included

Oil line and adapter kit for install a GT 35 R turbocharger in a Porsche 930 or 965 turbo.

GT turbocharger with oil center cooling.