I removed a HKS vein pressure converter and uni-chip and installed a MS2, V3 board using a existing T-harness to cut in. (factory wiring stays intact as does pcm)
Keeping the factory PCM in the car keeps all existing functions working correctly, such as cruise control, traction control, dash functions,A/c, etc.
The MS2 has Jean's Sequential modifications and runs the sequntial beta code.
Wasted spark is accoplished using the 5v pullup method, driving the factory toyota ignitor. There are simple PnP's in the proto area. The Cyl's are paired in like throws, 1&6,2&5,3&4.
Semi-sequential injecting is done using the Jbperf.com 4ch board, however I populated the ignition section with To3055's from radioshack to drive the injectors. (after blowing up all kinds of other drivers
![Laughing :lol:](./images/smilies/icon_lol.gif)
Driving Low Z injectors with the Jimstim and my powersupply , the case would get slightly warm around 7A's and 92% duty cycle:lol: Speaking of duty cycle, the injectors turn OFF at 85% with the IRF510 Fet's! They stick ON at 92% duty cycle with the TO3055's. A better condition for the pistons sure!
There is a second VR circuit aboard that is built with the exact values perscribed in the megamanual. I havent had to do much to get it to work with the G2 signal .
One positive thing about the 2jz pcm over the other toyota 24/2's is each VR sensor has it's OWN ground. no carryover signal to clean up..
By leaving the factory PCM in place sharing certain sensors such as the Vr inputs, the filter network toyota designed seems to be in place doing it's job. Scoping the inputs for Ne,G1 G2 produced a nice clean sine bilp. 24Vpp at idle speed of 640rpm. A bonus for your MS aspirations.
After chasing a few inductive demons around we are reset free, and ready to street and dynotune. The car made 525observed/548 Std correction on my Dynomite running a myriad of piggybacks and 20psi. It will be interesting to see what MS2 and the sequential code can do for us. 8000 rpm will be one big bonus with a turbo that doesnt do squat until 5K. The previous rev limiter was 6500.
![Shocked :shock:](./images/smilies/icon_eek.gif)
It's late and I'm tired. I will post a nice "how to squirt your MK4 supra" when a get a moment to sit down (along with pics).
Megasquirt FTW!
![Yeah! :yeah!:](./images/smilies/icon_yay.gif)
![Yeah! :yeah!:](./images/smilies/icon_yay.gif)