| They are perfectly capable of doing it and dont require any elaborate wiring or setup to get good results. The stock ECU uses 4-point interpolation, meaning, both the x and y coordinates take part in the calculation as 'x's refer to engine load and 'y's refer to engine RPM. It also has rather involved self-learning engine management capabilities that aftermarket management systems do not incorporate as well as diagnostic functions too. These self-learning capabilities allow for things like closed loop, alpha and gamma correction, and EGT closed loop control w/EGR; all of which improve fuel economy and make passing emissions a no-brainer. Some aftermarket systems have closed loop control, but not all. I'm sure even fewer have support for dual-inputs for 2 O2 sensors. Precautionary features of the stock ECU such as 'limp home mode', safety boost, secondary fuel and timing mappings for use when a sensor fault is detected, knock retard (not all EMS systems have this), etc. are also features that deserve merit. To date, I've made 1053RWHP and 865RWTQ with a Nissan ECU and the ZEM. Runner-up is Mike Vale's TT making 865RWHP, Peacemaker at 811RWHP, and the list is long. Mike Vale's TT had a haltech in it when he brought it to me and after two days of me working at it to just get an idle out of it, he pulled the plug and we put an OEM ECU in it and strapped in the ZEM. No need for the CDI system you were talking about either - nissan ECU and ignition amplifier will get the fire started. The real-time tracing feature of the ZEM allows you to see parameters of the nissan maps which are being used so that you can adjust only the parameters that need be. Taking it to the next level is the data acquisition element of the ZEM which allows for connectivity with any factory or aftermarket sensor; EGT, throttle position, boost, wideband O2, etc, as well as datalogging of the data to a file for later review make it a complete package for tuning the nissan ECU. I've used it to tune 100+ Z32s and there are close to 100 ZEM units out there around the world being used to date. We have a mailgroup hosted through yahoogroups.com which is used for news, support, and suggestions and any question you may have can either be answered there or I can be contacted directly. Standalone systems appear to be primarily for race-only-vehicles. However, they do have a lot of nice built-in features such as boost control which the nissan ECU doesn't have and they all have some variation of auxiliary inputs for additional sensors. Of course, they also have a means to alter the parameters to allow you to tune them. Additionally, they all primarily operate using speed-density rather than MAS. I'm not a big fan of speed-density as MAS on the Z32 has proven itself to work very well and it is more accurate than speed density, but some swear by it. Speed density does have the advantage of less restriction at the intake since there is not a sensor to have to draw the air through. Hope this helps - I've tried to make it as cut-and-dry as possible based on my experience and given credit as well as discredit to both systems - they both have their advantages and disadvantages and in this short divulgence I'm sure I have missed some things, but the main points have been covered. One should look over the benefits of each and decide for themselves which setup they need for their particular application. Some will like the advantages that the nissan ECU has for a high-performance daily driven vehicle whereas the hardcore racer doesn't need all the emission control and precautionary features; just get down to business and make her perform. Good luck to you whichever you decide!
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