Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2579952 for flyrotary@lancaironline.net; Mon, 15 Sep 2003 09:34:06 -0400 Received: from rad ([68.212.12.251]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030915133405.CSAJ13779.imf18aec.mail.bellsouth.net@rad> for ; Mon, 15 Sep 2003 09:34:05 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Good news, Bad news Date: Mon, 15 Sep 2003 08:34:07 -0500 Message-ID: <00b101c37b8e$09a7a4e0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B2_01C37B64.20D19CE0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00B2_01C37B64.20D19CE0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable operation of the butterfly on a turbo engine produces a more nonlinear outcome relative to power. The partial throttle operation should produce an = output below that of a nonturbo. Thanks, that's pretty much the answer I was looking for. Wouldn't it be better to watch boost, inlet air temp, timing and mixture = and not track MAP? I don't really understand what you're asking here. MAP is boost when it gets above ambient, and certainly there is a need to monitor the other parameters. Are you saying to quit worrying so much about limiting the boost to such a low number if everything else is in range? How much boost did the stock Mazda run on the street? How much advance = did the street cars have dialed in at full tilt? =20 I have no idea what they ran for timing on the 2nd gen engines. The = stock boost was 5.5 psi for the 87-88 S4 turbo, with 8.5 cr rotors. The 89-91 = S5 turbo ran 6.5 psi with 9.0 cr rotors. 10 psi is pretty common for both = on the street with just a few bolt-on mods. Now that I've looked at the = rotor chart again ( http://www.mazdatrix.com/r-rtrwgt.htm ) I noticed that the 89-91 seems to use the same rotors as the 93+. I know more about the = 3rd gen engines, and know that folks are running these way up in the teens = of psi for boost. I'm starting to believe that I could just retard the = timing a few degrees, and make sure I'm slightly on the rich side with fuel, = and let-er rip to 6-7 psi. Maybe I'm making too much of this 2-3 psi that = Bruce suggested as a maximum. Gotta think about this some more. Perhaps a small manual waste gate to get into the range. Or a popoff = valve in the intake ahead of the injectors. Whatever it takes, you will get it = right. Thanks for all the info. I really do want to keep the turbo, since this = IS supposed to be a hotrod (all evidence to the contrary so far). I've got some more planning to do, but I feel the front end redesign project is = going to happen sooner, rather than later. =20 Rusty ------=_NextPart_000_00B2_01C37B64.20D19CE0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

operation of the butterfly on a turbo engine produces = a more=20 nonlinear outcome
relative to power. The partial throttle operation = should=20 produce an output below that
of a nonturbo.

Thanks, = that's pretty=20 much the answer I was looking for.

Wouldn't it be better to watch boost, inlet air temp, timing and = mixture=20 and
not track MAP?

I don't really understand = what you're=20 asking here.  MAP is boost when it gets above ambient, and = certainly there=20 is a need to monitor the other parameters.  Are you saying to quit = worrying=20 so much about limiting the boost to such a low number if everything else = is in=20 range?

How much boost did the stock Mazda run on the street? How much = advance=20 did
the street cars have dialed in at full tilt? 

I have no idea what they = ran for timing=20 on the 2nd gen engines.  The stock boost was 5.5 psi for the 87-88 = S4=20 turbo, with 8.5 cr rotors.  The 89-91 S5 turbo ran 6.5 psi = with 9.0 cr=20 rotors.   10 psi is pretty common for both on the street with = just a=20 few bolt-on mods.  Now that I've looked at the rotor chart again ( = http://www.mazdatrix.com/r= -rtrwgt.htm )=20 I noticed that the 89-91 seems to use the same rotors as the 93+.  = I know=20 more about the 3rd gen engines, and know that folks are running these = way up in=20 the teens of psi for boost.  I'm starting to believe that I could = just=20 retard the timing a few degrees, and make sure I'm slightly on the rich = side=20 with fuel, and let-er rip to 6-7 psi.  Maybe I'm making too much of = this=20 2-3 psi that Bruce suggested as a maximum.  Gotta think about this = some=20 more.

Perhaps a small manual waste gate to get into the range. Or a popoff = valve=20 in
the intake ahead of the injectors. Whatever it takes, you will get = it=20 right.

Thanks for all = the=20 info.  I really do want to keep the turbo, since this IS supposed = to be a=20 hotrod (all evidence to the contrary so far).  I've got some more = planning=20 to do, but I feel the front end redesign project is going to happen = sooner,=20 rather than later. 

Rusty

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