somebody who knows a lot about turbos please help

WarmAndSCSI · 09-18-2010, 02:17 AM

Yes, that is slight surge heard as the BOV fluttering. It's not really that bad for the compressor - what is bad is compressor surge that occurs under load when the turbo outspools/outflows the flow capacity of the engine at a particular RPM. This happens a lot with stock-housing turbos on the Evo when you mess with cam timing to improve spool up.

I'm guessing 370Z's need a BOV like the Synapse since we don't have a lot (if any) vacuum available when you transition from WOT to off-throttle. This is due to the inherent throttle body behavior in the VVEL-equipped engine (butterfly valves are almost always open while the engine is running).

09-18-2010, 02:17 AM	#3 (permalink)
WarmAndSCSI A True Z Fanatic Join Date: May 2010 Location: SLC, UT Posts: 1,671 Drives: '08 Evo X \| '10 370Z Rep Power: 18	Yes, that is slight surge heard as the BOV fluttering. It's not really that bad for the compressor - what is bad is compressor surge that occurs under load when the turbo outspools/outflows the flow capacity of the engine at a particular RPM. This happens a lot with stock-housing turbos on the Evo when you mess with cam timing to improve spool up. I'm guessing 370Z's need a BOV like the Synapse since we don't have a lot (if any) vacuum available when you transition from WOT to off-throttle. This is due to the inherent throttle body behavior in the VVEL-equipped engine (butterfly valves are almost always open while the engine is running). __________________ '10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake '08 Evo X - built motor+trans \| BB-X @ 32 psi \| CH3OH \| self-built+tuned - ??? WHP '01 Galant V6 - built motor \| GT35R \| self-built+tuned - 550+ WHP (retired)