Like any good calibrator, I have been twitchy thinking about the stock ECU in my 1990 R32 GTR. It is 25 years old, based on a 6502 CPU, and has an 8k EPROM. There are a few tuning solutions that can use this ECU, but it is still 25 year old technology. I decided to get a Link NGTR+, which is basically a Vipec V44 in a single board factor that fits in the factory ECU case. The stock configuration is MAF based, but I’m switching to speed density. I plumbed a vacuum/boost reference to the MAP sensor and the car fired right up. I dropped in a wideband and started working on a calibration. It is an interesting motor owing in part to the 6 throttle bodies. A simple 3D fueling map (rpm vs map vs fuel) isn’t sufficient because even with a reference from post throttle body the cylinder filling varies a great deal based on throttle angle at a fixed MAP point. Interesting to tune!