GUIDE REQUEST for turbo map

[cwspellowe]

nice one

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as a second question....vaccuum actuated turbos...where the actuator is inbetween hot/cold sides...can that be controlled with a MBC?!?!

Think you've misunderstood something there mate.

All the actuator does is control the wastegate flap, either by a vacuum or boost signal.

A boost actuator pushed the wastegate open as boost pressure rises. A vacuum actuator allows the wastegate to move depending on the vacuum solenoid.

Are you talking about VNT's or wastegated turbos?

EDIT again..

I presume you're looking at VNT's where the vacuum actuator is physically located next to the CHRA and the flapper it controls is in the middle? They work a completely different way to wastegated turbo's and are much more complex than simply running an MBC. For a start, an MBC only works in boost applications, in a vacuum application it wouldn't let anything through as they need the air pressure to push a valve open, a vacuum would hold it shut. Also, VNT's work by controlling vane angle in the hotside of the turbo to generate varying levels of boost dependent on load and rpm's. If you fit one of them without any method of properly controlling the vanes something will die very quickly. They don't use a wastegate to bypass the turbine completely, their equivalent is to open the vanes up to decrease resistance in the turbine and build less boost

Strap one of them onto an XUD and use a boost actuator as with a wastegated turbo and you'll build boost exponentially until something dies.