Running Rich at Negative Manifold Pressure

Hi all, I'm running a Haltech Elite 2500 on an RB26 running at 1.4 bar. It has stock turbos, aftermarket injectors, and stock BOVs. My challenge is that the car runs very rich at negative manifold pressure. Using the Haltech app, I'm tracking the difference between my target lambda and the o2 lambda. When I'm at zero or positive manifold pressure, the ECU is doing what I would expect and adjusting fueling to align target and o2 lambdas. At negative manifold pressure, the STFT is running at 25% and the ECU is dumping fuel into the system. This is creating a situation where the o2 lambda is about 25% off the target lambda. For example, at idle the target lambda is set to 1.02. The o2 is reading around .76. I was thinking it could be a vacuum leak or something adding air to the system, but wouldn't the o2 lambda readings be aligned with target lambda (e.g. more fuel added to compensate for the air leak and then the o2 reads something close to target lambda)? Could oversized injectors create this situation? I had the stock injectors replaced with Siemens Deka 550s, which gives me room for future mods. Could I be overfueling in my current setup? I'd appreciate some insight. I'm new to computer controlled fueling. I have many years of playing with carbs and VW CIS-E/Bosch K-Jetronic, so I understand the concepts. I've also now watched many hours of online tutorials. Point being: I'm not a total idiot, but I'm low on my learning curve. -Kip

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Running Rich at Negative Manifold Pressure

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