Aerochargers etc: real back pressure numbers

[Frank F Parker]

> Insightful info.  Thanks.  I am curious as to whether you had an exhaust
> system downstream of the turbine in your TY during those tests (ie: piping,
> converter, muffler), and whether you data logged the EBP at the turbine
> discharge?  Anyone else ever measure this type of thing?  I know this is
> going to sound rather vague, but, what's an acceptable value for post
> turbine EBP in a street car before seriously impacting a turbo's capability?
> Walt.
>

Yes, I had a complete exhaust, 3" downpipe back to a Flowmaster and 3"
over the rear axle, but test pipe in place of cat.

Sorry, did not measure EBP at the turbine exhaust but from tests others
have reported, it seems turbos like the lower the better. In fact, in the
early days of turbos, exhaust backpressure was often used to limit boost.
( my old 66 Corsa turbo, for example). Also used an external HKS wastegate
with it's output fed back to DP about 3x dia's down the pipe.

regards,

frank parker


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