User-Agent: Microsoft-Entourage/10.1.4.030702.0
Date: Sat, 12 Jun 2004 06:16:25 -0400
Subject: FW: Turbo over boosting
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-ID: <BCF05039.D5C8%atlasyts@bellsouth.net>
In-Reply-To: <40CA8B04.FBFBDC7D@earthlink.net>
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From: ACRE <rotaryeng@earthlink.net>
Organization: ACRE
Date: Fri, 11 Jun 2004 21:48:04 -0700
Subject: Turbo over boosting


> > Kind of hard to believe all this as the stock 90-91 engine only
> > generates about
> > 5 or 8 psi max. This is pretty much identical to what Francois is
> > running
> > with no apparent problems. Francois what is the diameter of your
> > exhaust
> > pipe after the turbine?


> Not hard to believe at all, Series 5 is 8.5 psi from the factory,
> limited by exhaust restriction, and also intake restriction.  This is
> why opening the exhaust on a turbo RX-7 gives so much power.  Racing
> Beat:
> 
> "The bolt-on exhaust system increases horsepower approximately 32% - a
> 59 HP increase on a 1987 Turbo II RX-7!"
> 
> Mazdatrix adds:  "Boost increase is 4-6 psi. Fuel  cut controller is
> required to prevent fuel shut-off to rear rotor due to  the increase in
> boost pressure seen by the factory computer"
> 
> Basically the factory wastegate is designed with the intake and exhaust
> restrictions in mind.
> 
> Many have blown rear apex seals  on the 2nd gen turbos by using less
> restrictive intake/exhaust and the factory computer computer shuts fuel
> off to the rear rotor at around 11 psi, thus detonating the rear rotor.
>   Stupid move on Mazda's part.
> 
> Hans

 
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