Sylvain Bourgault Posted July 4, 2014 Report Share Posted July 4, 2014 Setup: 2.5L engine with 8.75 CR. VF29 turbo. 40mm external wastegate. 3 ports grimmspeed boost control solenoid. Â Problem: The tune was completed on a dyno (timing, fuel, boost control). Target boost 16psi at 4000rpm dropping to 10psi at 7000rpm. Once on the road, boost was reaching 20psi at 400rom and 14 psi at 7000rpm. Load seems to be a BIG factor in my issue. Â Tests: I did try to run wastegate pressure (0 duty cycle) and it is perfectly stable at 9psi. No leak anywhere in the system. Â What could I do? Thanks. Quote Link to comment Share on other sites More sharing options...
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