So, here is where we are...
The idea of the 7th injector is not the ideal solution. That being said, it is the most cost effective solution. As Rick says, from a mechanical stand point the kit is 100% and from an electrical/fuel management point of view it is 98% The problem is the pre-2005 PCM. 2005 and up PCMs can be, and are, reprogrammed and we all know that our XJ PCMs cannot. There is a long history of sending air/fuel through the blower. How do you think draw-thru dragster engines work? One or more carbs on top of the blower.
We will be installing the production kit, hopefully next week, when it gets here from Oz. I will report on that after it happens.
Interesting features:
1. The belt tensioner bracket (beautiful piece, I'll photograph it next week) is vehicle dependant. XJ/TJ, LHD/RHD differences in the mounting drove the different designs. I don't know how much you all are familiar with, but dedicated castings are a major investment in tooling. Then they have the mounting surfaces machined after casting.
2. Multi-bar MAP sensor.
3. The piggyback computer is going to look at water and air temps as well as the boost pressure to adjust the timing.
3. Intake manifold. Wait until you see the pictures... The SC mounts to the manifold with 4 bolts and uses an o-ring seal. Tha manifold itself has reliefs in the bottom to make it easier to bolt onto the engine. What an idea, have the installer in mind...
The attention to detail is amazing. The quality of the castings looks are OEM quality. It is well thought out and is designed to be installed in an afternoon. Not much more work than changing the manifold gasket. One cut and splice and a few new connections to the piggyback.
Other projects in the works:
1. Electric water pump with controller. Actually, my XJ may get the first one... These are in use in Oz, just new here.
2. Electric fans with controller. Again my XJ...
Both of these use a PWM based motor drive with temperature sensing. For those unfamiliar, PWM means Pulse Width Modulated. The idea is that you send pulses of DC to the motor to control the speed of the motor. Proven technology, this is how DC Servo Motors on CNC Machines work. As the voltage stays constant, the HP of the motor is maintained. You can vary a DC motor speed by voltage but, you lose the HP and torque at the lower voltage levels.
As the Hot Rod market has been using electric water pumps for years with no real issues, this should go like gang busters. Removes drag off of the engine which translates into HP and fuel economy improvements. The difference here is that instead of using an electric motor to turn the mechanical pump, this pump will set in the lower radiator hose and the mechanical pump will be gutted out. Can you say full flow at crawling speeds?
If it sounds like I'm hyping this, well I sort of am... I will be involved with the SC kits from now on and will be helping to develop the other projects. My thanks to the guy that initially posted the link to the web site... Looks like my forced retirement will not be as boring as it has been.