Diesel Forum - TheDieselStop.com - View Single Post - '2015 turbo upgrade with streetmax turbine and sustained turbo bark
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post #7 of (permalink) Old 02-04-2018, 04:07 PM
shoguy89
 
Join Date: Jan 2000
Location: Atlanta, Georgia, USA
Posts: 607
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The bark is called compressor surge. it happens to all turbos, but you get to hear it more with an open element filter. Torque reduction from the computer during shifts exacerbates the issue. The bark comes from shutting off the exhaust energy to the turbine. When that happens, the shaft speed slows down abruptly. Then all the compressed air in the intake tract tries to back flow thru the compressor. When you've got your foot in the throttle and the engine is at higher rpm and making more torque, the shifts don't have the same effect. The engine can make enough exhaust energy to keep the turbo spooled up.

That said, is a single turbo an upgrade? Maybe, maybe not. I like the Dual Axial Compressor system. I'd like it to be a little bigger, but it does a really good job. Making more power requires more air. So it does have it's limitations. But I think drivability is much better than with the standard style turbos.

Doug Lewis

Ford Performance Specialists
351 Six Flags Pkwy SE
Mableton, GA 30126
770-949-7191

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