Soarer Posted July 7, 2017 Share Posted July 7, 2017 I've had my car back from the tuner now for a few months and I'm a wondering if I've got an issue. I'm running a BNR 18G turbo with all the supporting mods and I can make decent boost in lower RPMs but don't seem to feel any power hit until I get over 4k RPMs. For instance, I'll lean into the throttle at 2750 RPM and watch my boost gauge hit 12-15 PSI as the motor starts to spin up from 3k RPM to 4k RPM but I don't really feel the power hit until over 4k RPM when I'm making 20 PSI. I'm a bit disappointed with this as the vast majority of driving I do is below 4500 RPM. I don't have any check engine lights or boost leaks. Is this just how my tuner decided to build the power curve or is there something wrong? Link to comment Share on other sites More sharing options...
Rubaru Regary Posted July 7, 2017 Share Posted July 7, 2017 Are you satisfied with the power that comes on after 4k? Seems completely natural for a larger turbo to not get the power going until that range. And 12 psi on a tuned car is a normal pressure to build down below 2.5k rpms without the car really starting to move. Link to comment Share on other sites More sharing options...
08Legacy-GT Posted July 12, 2017 Share Posted July 12, 2017 Just your turbo, spools when it spools tuner cant make it spool any quicker. I'm not a fan of any BNR turbo personally. 2017 Subaru STI 2008 Subaru Legacy 2.5i limited Link to comment Share on other sites More sharing options...
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