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Just a pure TT motor swap for under $3000. : Ok, for those of you who have been following this, I have some new things to show-and-tell :-D : First of all, I have the software completely written and all sensors are calibrated to correspond to the Nissan CONSULT device as well as a few others. : I have recently installed a manifold pressure sensor and have written that into the code. Additionally, I have written the event driven system that will allow me to change my boost pressure on the fly simply by changing a threshold pressure value. Here's a couple of pics of the newly designed interface, the first is at idle and the second is at WOT.
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: You can see here that the manifold pressure is at appx -8PSI which was calibrated using a vacuum/pressure guage. The throttle position sensor has been changed from its original voltage unit into a percentage unit (0-100%), left and right O2 sensors have been changed from graphs to floating triangles with both min and max tolerance levels. The detonation sensor is still in its original format as that information is best viewed as a graph. I have also added in engine temperature (in degrees F) display as well. :  : Now, here's the cool stuff - the manifold pressure display is also linked to an event driven output which will open and close the wastegate solenoids. The solenoids are simply electrically controlled valves that either allow pressurized air to pass through them or not. Applying pressure to the wastegate actuator opens the wastegate to lower boost and when the solenoid is closed, the wastegates are held closed beacuse the air pressure is not being routed to the actuator. When manifold pressure threshold is met - that being the maximum boost in PSI that I want it to boost up to, the wastegate solenoids are opened, pressure is sent to the actuator, and this opens the wastegates. But it will only open the wastegates until the manifold pressure falls below the preset boost level I want. In the second picture you can see that the wastegate SIM (simulation) is showing them as open, this is because I have set an arbitrary threshold value of -2.5PSI. The first pic shows them closed because manifold pressure is below -2.5PSI. Changing boost is as simple as changing the number in the threshold value. This takes appx 5s to do. : The speed of the reaction is awesome. The data acquisition board I am using runs at 40,000 samples and outputs per second. Since the manifold pressure is under completely dynamic conditions, the pressure will rise, fall and pulsate very quickly - so we need an acquisition card fast enough to keep up with the demand. The acquisition adapter can open and close the wastegate solenoids at a rate >100Hz, that being over 100 times per second. This is absolutely necessary to have because I want to be able to eliminate boost spikes and maintain a specified boost pressure very accurately. Boost spikes come from the lag associated with aftermarket boost controllers, you wont find that here. If you want more boost though, it can always be changed! :-D : Additionally, I have written the code for mixture adjustments. Intercepting the o2 sensor information and adjusting that value real-time by whatever I please and then directing it into the ECU, I can fool the ECU into either dumping more fuel or less as to change the mixture. : In the bottom of both pictures are small minimized windows that I have generated that measure two other sensors; injector pulse width and vehicle speed.Injector pulse width is pretty cool to see, but is virtually useless information. Just got bored the other day and wrote the code for that. BUT, the vehicle speed sensor is actually an awesome sensor to have. You might be saying, "What could be so cool about having a computerized speedo when there is one in the dash?" Well, here's your answer: If you know the vehicle speed, you can derive the rate of change of speed. This is accelleration. From accelleration, vehicle weight and a few more mathematics, you can calculate net horsepower. In fact, it is much more accurate than the G-Tech accellerometer results. (Yes, I got duped into buying one of those pieces of garbage) :-D.
: G-Tech was saying my car was making an impressive 210-230RWHP but totally incorrect for a StageII NA. Go figure. I have been consistently running 182RWHP +/- 2HP during different environmental conditions. Forget the dynos - get a computer. You want a horsepower rating - I'll show you one. : Now that I have gotten through all that stuff, here's what's to come in about a month. I have priced out numerous parts for the engine - main bearings, rod bearings, TT pistons, rings and an complete engine gasket and seal kit. $600. Helluva deal if you ask me - but then again, it REALLY helps to be in tight with your local Nissan Parts Manager. :-D : I am planning to do the engine rebuild within the next month or so - I still need to get together a few items like oil cooler, radiator, Stillen GTZ-R fascia, etc.. I am also going to go with a lightened flywheel with a performace clutch, unorth UD pulley and upgraded ECU. : Once all this is complete, I plan to be boosting around 14-18PSI (or however much these T28's will put out safely). : I also have a NOS kit (nyuck nyuck nyuck) that I will be inetegrating into the system once all the hardware mods have been completed and successfully tested. And yes, this too will also be controlled via the computer. : All this in a lighter slicktop Z (no t-tops) and not as much body flex either. Not that I dont like t-tops, actually wish I had them, but owell. :-D GOtta sacrifice somewhere. : I'll keep all of you posted here as things develop - so look forward to seeing some cool pics of the VG30DE internals!
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