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

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.

:happydance::tup::tiphat::driving:

Love the fender liner, very nice! Are you going to have any videos of this car by chance?

what's that green filter?

meth setup looks awesome!

Pricing for the Meth kit please!

The car's been running great. The install is pretty damned clean. I'm taking her to Laguna Seca on Saturday so I'll let you guys know how she performs.

Impressive car. My question for the GTM guys is what (if any) benefit would you get from injecting water only? That's what I am interested in doing basically to deter detonation and help with cooling the engine. As great as water/meth is, I can get water anywhere, and I am not interested in keeping stocks of meth and water. Since I live in SoCal, I don't really have a freezing issue.


That's the air-filter feeding the SC compressor wheel.

that's quality work

If I'm correct, a stock 370Z is meant to run on 98 octane.

The SC Kits aren't? :ugh2:

In the U.S., premium gas is typically either 91 or 93 octane, depending on the state. A stock Z requires 91. So to answer your question, no.

Interesting. I just looked up the Australian specs and it states:

"Recommended fuel type - Premium Unleaded 95 RON or higher (for optimum performance use 98 RON fuel)"

Anyone know how this impacts on the SC kits if at all?

The US and everywhere else calculate their octane levels differently. I believe that US calcs (e.g. 91) correspond to slightly higher RON numbers.

From Octane rating - Wikipedia, the free encyclopedia: "Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel."

We do not have any videos as we were pressed for time on this project.

We'll be putting together a package and adding it to our website.

Injecting just water will only improve knock resistance. The methanol will lower intake air temperatures more than just water alone in addition to having a higher knock resistance than gasoline. Jordo and I had a good discussion in a different thread that went into more detail.

If you are doing water/methanol or just straight water, you MUST use DISTILLED water! Any dissolved solids will clog the injectors over time! Think about how often you have to clean/replace the aerator screen in your faucets at home...especially in SoCal where we have nasty, hard water that is barely potable. You do not want that dissolved lime and crap in your motor do you?

Like Nix said, we Americans rate our fuel on the conservative side. Our 91 octane is comparable to your 95 octane and our 93 octane is comparable to your 98 octane.

As far as how it would impact the S/C kit, you would run a little richer on higher octane fuel as it would have less propensity to fully combust. Therefore, you would have a conservative tune for your conditions...nothing wrong with that.

NIce, I ran the Aquamist HSF-5 kit on my Evo. Probably the best meth/water injection kit out there. :tup: