GTM Performance Engineering: GTX V3 Twin Turbo Kit

Alstann

More or less.

Keep in mind, there is so much more to turbo kits than raw power. Generally speaking, all GTM turbo kits have the capability to produce more power than the stock motor can handle, which is estimated to be around 550-600whp. The differences in the kits allow for better efficiency and response, as well as extra headroom for different power paths.

For example - the GTX GTM kit comes with the GTX turbos, which many people would argue produce negligible increases in power since the efficiency maps are similar at low boost levels. However, at higher boost levels, the GTX flows very efficiently. Also, the GTX turbos have higher adiabatic efficiency overall, and would lead to better transient response and spool characteristics.

Also, the GTX kit comes with 1100cc injectors, and 340lph fuel pump. In other words, it's also full-E85 capable.

On the other hand, the MHI kit has smaller injectors/pump, and the turbos are journal bearing. But, that being said, you can totally make 550+whp with that kit. You can also look at the reliability and simplicity of the MHI turbos - turbos people have been using forever and they work great.


That's one thing about turbo cars - it totally changes the driving dynamic of the car. You'll be going from a car with a totally linear, all-motor powerband to a car that now has a delay due to lag and response with forced induction.

Big turbo cars have an inherent issue - they make great power and in a straight line with the right setup - they are fast as hell, but during dynamic driving events such as tracks, or even in the city and just cruising around - the car drives like a dog. You'll always be waiting for the boost to build - and by then, it's too slow. I believe in minimizing that boost delay and improving the response to behave as much as all-motor as possible - since I enjoy driving dynamically, and not just fast in a straight line. And yes, you could use external implements such as nitrous to help turbo spool and other ECU tricks, but we're just talking turbo basics.

It all comes down to what you are looking for in a kit. Me personally? I want the most efficient setup possible. A kit that will provide the best transient response, run the same power level on lower cylinder pressures and temperatures (possibly with E85), and has lots of headroom since I plan on a build down the line.

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