If he is using the stock Mazda turbocharger, I believe he can get that kind
of boost at altitude.  The stock turbine out-let area is really inadequate
for the amount of exhaust gas mass flow you can get at WOT.  They have had
continuos problems with boost creep on the Rx-7 (at least some model years)
due to this.  So with the effective A/r of the turbo that small, 38" is
probably attainable where it wouldn't be with a turbine housing sized for
aircraft use.

I personally believe getting the stock turbo modified as offered by the
Aussies at this URL overcomes some of the limitations of the stock turbo for
aircraft use as I see them.  Of course going to some of the T4/T3 series
turbos can do the same as they have turbine housings with A/rs ranging from
around 0.4 to over 1.2.

http://www.turbonetics.com.au/ATS_p&s_12a_13b.htm

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Michael D. Callahan" <micallahan@worldnet.att.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, July 09, 2004 1:14 AM
Subject: [FlyRotary] Re: Turbo post mortem


> Hard to put out 38" at 11.5K with the gate wide open;-) I want an intake
> like HIS if he can do that! Mike C.
>
>
> > 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>
>
>
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