Re: Turbo Tuning

["Jeff M" <tystorm@email.msn.com>]

I need to correct myself on the turbo rating, it is LB/MIN (use to injector
ratings ;-).  Now, most guys ask what PSI I run, that is not a good
indicator of power making.  Then they ask what CFM, not the best rating yet
but closer.  The best way to rate a turbo's potential to start is by mass
air, i.e. LB/MIN or pounds of air flow per minute.  At Garrett's web sight,
they rate their turbos by Compressor Flow LB/MIN and all those values you
indicate come up with this and the map, as you know ;-).  I hope that helps?

Jesse


> At 09:31 PM 4/18/00, you wrote:
> >Let me first say where my brain resides, I understand GM digital fuel
> >injection systems including sensors and controlled devices etc.  I also
> >have a good background in engine mechanics rebuilding stock and high
> >performance engines.  I also use and comfortable understand hex and
> >decimal reading systems for our bins, being able to make changes and burn
> >the EPROMs.  I Also understand GM calibrations (that was fun) regarding
> >tables, calcs and usage strategy.  The tuning tips provided by such great
> >guys such as ECMNUT and Bruce P were excellent reading and helped fill
the
> >gaps as well as confirm previous areas of understanding.
> >
> >Now, the work that I am doing (and I feel that my ground breaking and
> >learned results shared with the list here will help enlighten many who
are
> >coming up the ranks of being tuners) is to change the tables in my bin to
> >accommodate the mechanical and external changes done to this engine.  I
> >have a set of high performance aluminum heads, more aggressive supposed
> >computer friendlier cam upgrade, 29 lb injectors and a 39 lb hr turbo,
low
> >compression pistons and a well done performance rebuild to the rest of
the
> >engine.  I will run pump gas for now but 100 octane will later satisfy
the
> >need for more speed, later.
>
>
> Curious what the heck a 39 lb/hr turbo is...
> Turbo's are really not flowed in lb/hr etc... as they all depend on
exhaust
> trim and housing for spool, and compressor trim and housing for
> boost.  Different combo's of the above can be used to tweak the power
curve
> of an engine to meet it's desired purpose.
> Never in my 37 years of auto mechanicing seen one advertised or even rated
> on a spec sheet/compressor flow chart in Lb/hr.
>
>
>
> ===========================================================
> David Cooley N5XMT Internet: N5XMT@bellsouth.net
> Packet: N5XMT@KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
> We are Borg... Prepare to be assimilated!
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