GTM Performance Engineering:PROJECT: VQ42VHR S/C

[SAM@GTM]

We would like to share this amazing project,Christopher brought his gorgeous G37 Sedan to us to create the ultimate torque monster supercharger build to complement his impeccable aesthetic. To get massive torque, we suggested our 4.2L stroker engine as the basis with 11:0 compression ratio to maintain as much torque throughout the power band as possible. Riding that wave of torque is our Stage 2 Supercharger Kit to give an extra wallop of power up top. As a result, this G42 sedan feels like a big V8 was swapped in…only better.

Here is the list of the upgrades

GTM Stage 2 Supercharger-600HP
GTM Stage 5 Short block - 4.2 L
GTM Stage 1 Cylinder Heads
GTM Micro Surface Treatment
GTM 2.5" Cat-back exhaust
GTM 2.5'' Test Pipes
GTM Competition 70 MM Radiator
GTM Thermostatic oil cooler
GTM Return fuel system
GTM ECU reflash via Osiris uprev
GTM Race logic Traction Control System
OS Giken Twin Plate Dampened clutch/flywheel kit
Aquamist Meth Injection HSF-4
HKS KNOCK AMP
HKS CAMP 2 System



Results

With our GTM Stage 2 Supercharger Kit and GTM Stage 5 4.2L Longblock and supporting modifications, we were able to make 546whp and 411ft-lbs of torque.

Taking a look at the graph below, you can see that this setup has an extremely nice torque curve for a centrifugal supercharger with 90% of peak torque from 3900rpm to 7600rpm with substantially more torque than stock even below that. With this setup, we were able to max out the intake design of our Stage 2 Supercharger system. Since we found the limit of what the intake system can flow, and we know that the supercharger unit itself can flow more, we are in the process of developing Stage 3! Our goal is to break the 600whp mark on our supercharger system. Stay tuned for more information on that development.

As with most car projects, this isn’t over until it’s over. This car will be returning to us for some more tweaking after this year’s car show season comes to a close. Stay tuned for more updates on this project later on this year/early next year.

Now to fun part, Here are all the pics of the project by category

Project featured components











































Before pics











Car tear down

Engine tear down