GTM Stage 2 S/C on Meth 507whp/357wtq

Mike@GTM

Derek called us up wanting our Stage 2 Supercharger and wanted to get the most out of it on pump gas and keep his beautiful black 370Z reliable. We recommended incorporating water/methanol injection to compensate for the low knock threshold of 91 octane pump gas.

To increase the knock threshold, we decided to do a 5 port injection setup. This entails an injector right before the intercooler, a small injector before each MAF and the main injectors after the MAF sensors. By using very small injectors before the MAF sensors, we are able to lower the intake air temperature the MAF sensors see without dousing them in copious amounts of water/methanol mix. This allows the ECU to advance timing automatically with very little fine tuning. This resulted in an impressive 40whp gain.

The water/methanol system we employed is the Aquamist HFS-3. This is by far the most sophisticated water/methanol injection system on the market. Rather than a simple MAF sensor reading or boost pressure reading, the HFS-3 reads injector duty cycle to calculate how much water/methanol to inject. This means that the car's ECU has already calculated the amount of fuel it will be injecting based on all the sensors it has at its disposal (TPS, MAF, IAT, ECT, RPM, etc.). This not only simplifies the water/methanol system wiring, but it also give it the most accurate picture of what the engine is doing. The HFS-3 also has an ON/OFF switch that enables the end user to decide whether or not to use the system at any given time. While that might sound basic, there aren't many other systems that allow you to just turn it off. The HFS-3 incorporates a failsafe feature that monitors the flow rate of water/methanol through the system to detect leaks, clogs, or an empty reservoir. This gives a warning so the user can take their foot off the gas and switch to a non-methanol map.



To increase airflow to our engine oil cooler, we developed a louvered fender liner to allow air to get sucked out through the oil cooler. This allows for additional heat to be dissipated through the 25 row oil cooler without compromising the front end aesthetics.