Miata stops making boost around 5000rpm
#1
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So i've randomly encountered a strange issue that i need some help identifying. So the car ( 1.8 turbo with mspnp2, stock engine) pulls hard up to around 5000 or so RPM and just loses all boost pressure, it makes a very quiet sound similar to compressor surge. Im not running a BOV at the moment but i wasn't having the issue before i put on a boost controller. I've tried running with wastegate pressure and get the same noise. Any ideas would be greatly appreciated, thanks!
#7
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Ok so i did a few pulls and got it to happen once in this log, it happened right after the first mark i placed. The car has no cats, 3in exhaust, no boost leaks. I'll be installing a BOV when it arrives to see if that could be the difference but i don't think it's the cause.
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what turbo/Wastegate setup so you have? Maybe Wastegate blowing wide open under high rpm boost?
Last edited by borka; 07-14-2018 at 12:33 AM.
#11
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Ok so i made a couple changes and i'm still getting the same issue. I have a great datalog of the issue occuring twice. I tried stayed on the throttle so you can see boost falling off and the car just loses power. I really have no idea what it could be because its not making any crazy noises, it just stops making boost. Turbo is a china t28 with ebay wastegate. Could my turbo be shot?
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gorillazfan1023
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01-24-2013 07:47 PM