TuxBlackEB

Justin,
The sound that you are hearing is compressor noise from the increased
boost and change in modulation of the CBV(Compressor Bypass Valve)that
equalizes boost pressure from the turbochargers. This is different from
the waste gate as it acts on the compressor housing, diverting boost
back into the low pressure side of the inlet as opposed to the waste
gate, which re-routes exhaust gas around the turbine.

Increased compressor noise is inherent with any rise in boost over stock
on any forced induction engine. This is not something that will cause
damage to the turbos. When you let off the gas and the throttle plate
closes, you experience a momentary increase in boost pressure because
the charge(air under pressure leaving the turbo) is hitting a wall as it
reaches the closed throttle plate. This increase in pressure has nowhere
to go so it would normally back up all the way to the compressor wheel
of the turbo, forcing it to slow or stop because the air has nowhere to
go. This could cause damage to the turbo over time if the Compressor
Bypass Valve did not open, relieving the pressure.

Short answer is no, you have nothing to fear from the greater amount of
turbo noise.


Thank you,
Drew Gorrie
Superchips Inc.
888-227-2447

boosted150

Good info, thanks for posting

woogieboogie

I'm glad they don't have to fix it, because I friggin love that noise

TuxBlackEB

I love the noise, too! Esp now that I know it's normal. I was glad to get a response from SC, and then post if for everyone concerned.

Mudweiser

Okay so I am trying to catch up here. You are talking about the superchip programmer for the EB. What gets louder, the turbo whistle or the bypass release valve noise?

TuxBlackEB

I believe it's the bypass release valve noise that I'm hearing. The actual noise coming from the turbos sounds the same.

MGM

Are you referring to the "chirping" noise or the sequential noise coming while under acceleration? Or just when you let off the throttle????

Because I'm finding myself getting a bit annoyed with it under acceleration, doesn't sound right at all, plus my truck surges mildly while its doing it.

woogieboogie

It's more of a "SHOOP" noise for me when i let off the throttle under boost, no chirping for me

MGM

Yeah that's supposed to happen, will with any turbo car.

Mine does it under mild acceleration or climbing a hill while STILL on the throttle.