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Did have a thread but starting a new one because its not backwards its just not boosting at altitude. Yes I have contacted mpi and dealt with them. 2015 Yamaha viper mtx 190 kit. So far no boost leaks, eabc and gems has been tested. Turbo has been tested and run on another sled. I bought a new map sensor and seemed to work for a bit but now same as the other one. I finally got to test at 6500'-7000' and only 4-5 psi. It doesn't over boost after about 5000'. Supposed to the way the eabc works I guess. I'm sure it has something to do with the eabc, map sensor, gems box. Thought it could be a voltage problem? I wont be able to try it again this season but hopefully I can have it figured out for the next one.
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