Insert the high-pressure line from the output of the pump into the quick-connect fitting labeled PUMP on the front of the SafeInjection unit. Pull on the hose after inserting to ensure a tight connection. Insert a second high-pressure hose into the quick-connect fitting labeled NOZZLE on the front panel-the other end of this hose is connected to the nozzle itself.
It's important to note that the J&S SafeGuard is designed to pull up to 20 degrees of timing when reading through its knock sensor, while its switched timing retard (triggered by the Snow Performance SafeInjection in this test), offers only 2 or 4 degrees of timing retard. In this test, we were able to increase total timing from 19 degrees to 26 degrees for a total increase of 7 degrees. Obviously, the 4 degrees of retard built into the SafeGuard will not be sufficient, but J&S informed us that the unit can be reprogrammed to provide even more timing retard. Based on your engine combination, this will be something you'll want to consider when ordering the unit.
Our subject vehicle for this test was an '01 Bullitt Mustang belonging to Bob Watson of Jacksonville, Florida. Bob's Bullitt (No. 5094) has the distinguished honor of being the second fastest Bullitt Mustang (according to www.imboc.com) in the country, thanks to its big-bore 302ci, Vortech-supercharged powerplant. It has run a best elapsed time of 10.01 at 136 mph.
We followed along on the install as Matt Snow and HP Performance's Jason Combs handled the SafeInjection installation. HP Performance in Orange Park, Florida, also provided the Dynojet dynamometer for our testing purposes, in addition to SCT custom tuning by HP's Tony Gonyon.
The installation of these two components is fairly easy, though we don't recommend it for the novice. Working in tandem, the SafeInjection and SafeGuard allowed us to crank up ignition timing by 7 degrees, and safe horsepower escalated as a result. Should the water/meth mix run out, Watson now knows that the safety devices he has in place have his back.
The SafeInjection unit has a user-adjustable dial that can be used to set the flow point at which the +12-volt trigger signal is activated. The recommended starting point is one half of total nozzle flow rating. For example, if using a 375ml/min nozzle, set the trip point around 187ml/min. If using two 375ml/min nozzles for a total of 750 ml of nozzle flow, set the trip point to 375. | 
The SafeInjection unit we used was an early model and featured this warning light, which we installed next to the Boost Cooler power-on light. Later units will be offered with an actual flow gauge. | 
Snow Performance's Matt Snow (right) and HP Performance proprietor Tony Gonyon (left) discuss the dyno results and how much timing could be added once the water/methanol mixture was flowing. |
By the time you read this, Snow Performance should have this trick flow gauge available for its SafeInjection customers, which will give you a bit more information than whether the system is flowing or not. | 
Our Subject vehicle features a 302ci, Darton-sleeved mod motor from VT Engines, along with a Vortech T-Trim supercharger and aftercooler. Our baseline pull on pump gas produced 520 hp and 492 lb-ft of torque at the wheels at 15 psi of boost. | 
Baseline total timing was 19 degrees, and with the Boost Cooler spraying at full tilt, we were able to take total timing to 26 degrees. Manifold pressure jumped to 17 psi, and power escalated to 602 hp and 531 lb-ft of torque. |