motorbreath Posted September 20, 2022 Share Posted September 20, 2022 I just finished an opensource e-tune a few weeks ago use RomRaider/TactrixOP for logging. I switched back to my usual gauges through through my aftermarket head unit through my iDatalink/Maestro. The "boost" measurements I am getting through this system and through Btssm/TactrixOP are quite different than what I was getting using RomRaider. I am seeing maximum boost in the low 20s, like 22-23psi, which is waaaay higher than I expected. With RomRaider I am seeing manifold relative pressure topping-out at 18.43psi, attached. I have also attached a plot of manifold absolute pressure from RomRaider. Am I completely missing something or am I doing something wrong with RomRaider and actually overboosting badly right now? Link to comment Share on other sites More sharing options...
motorbreath Posted September 20, 2022 Author Share Posted September 20, 2022 Ok, I kind of feel like an idiot, I should have known that the MRP flatlined like that is a measurement or protocol issue, not the actual value. I've found a few RomRaider forum posts about this being related to Subaru's SSM protocol for interacting with the ECU. Either way, I was not understanding what was going on during the tuning process and there is waaaay too much boost mid-range for stock engine. I'll save this map for when I eventually get the engine built and see about getting a revised tune limiting boost to 18psi. Link to comment Share on other sites More sharing options...
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