I was also thinking about the greater exhaust back pressure on the engine. That may cost some HP too?

Bulent

On 7/9/04 1:16 AM, "Russell Duffy" <13brv3@bellsouth.net> wrote:

""" By the way, I was showing 38 MAP at 11,500 ft with the wastegate fully
open.
  However,  there's an open 1/2 inch air bleed on the intercooler (to be
  closed off) and a blow off valve, so the turbo may have been putting out
  much more than the MAP showed."""


That doesn't sound right.  How big is the wastegate, and what style (ie,
throttle plate or Delta-gate (or Race-gate)?  With the wastegate fully open
the majority of the exhaust should be bypassing the turbo.  Or am I
misunderstanding your comment?  WOuldn't be the first time. <g>

      <Marv>

Marvin,

John's comments are probably right on the money.  One of the most significant problems is that the stock turbo's have small, internal wastegates.  They are barely adequate in the cars, even with serious restrictions in the intake, and exhaust systems.   His numbers indicate that he was putting out close to 10 psi, plus whatever he was losing through the half inch hole.  When you consider that he was doing this for hours, rather than seconds (as it was designed for),  it's not surprising that it failed.  I've got my fingers crossed for the Oz mod.  At least it should give the turbo a fighting chance.  

Cheers,
Rusty (very satisfied Todd's Canopy customer)