Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.1.4) with ESMTP id 2607061 for flyrotary@lancaironline.net; Sun, 28 Sep 2003 13:15:06 -0400 Received: from rad ([68.212.13.204]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030928171505.IYRV1874.imf18aec.mail.bellsouth.net@rad> for ; Sun, 28 Sep 2003 13:15:05 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Life is better at 5 psi Date: Sun, 28 Sep 2003 12:15:07 -0500 Message-ID: <000001c385e4$10d30b50$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C385BA.27FD0350" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C385BA.27FD0350 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit The wastegate on my 89 (S5) RX-7's turbo cracks right around 5.5 PSI. The higher (than S4, being 86-88) boost is attained with an ECU controlled solenoid which bleeds pressure from the signal line between the compressor and the wastegate actuator. Hi Matt, You could be right. Mazda certainly could have used the same actuator pressure on the S4 and S5, but since they don't list the part numbers for the actuator, I can't tell. I was just hoping that maybe the earlier version was a slightly lower spring pressure. I figure the easiest way to tell for sure will be to get one of each and test them. Porting the wastegate will be the big question now. I've read a bunch of RX-7 forum messages about this. Some folks go so far as to make the ports larger than the flapper that covers them. Until I really get one apart to examine it, I won't know quite what I'll try. Thanks, Rusty ------=_NextPart_000_0001_01C385BA.27FD0350 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

The wastegate on my 89 (S5) RX-7's turbo cracks right = around 5.5=20 PSI. 
The higher (than S4, being 86-88) boost is attained with = an=20 ECU
controlled solenoid which bleeds pressure from the signal line=20 between
the compressor and the wastegate actuator. 

 
Hi=20 Matt,
 
You = could be=20 right.  Mazda certainly could have used the same actuator pressure = on the=20 S4 and S5, but since they don't list the part numbers for the actuator, = I can't=20 tell.  I was just hoping that maybe the earlier version was a = slightly=20 lower spring pressure.  I figure the easiest way to tell for sure = will be=20 to get one of each and test them. 
 
Porting = the wastegate=20 will be the big question now.  I've read a bunch of RX-7 forum = messages=20 about this.  Some folks go so far as to make the ports larger than = the=20 flapper that covers them.  Until I really get one apart to examine = it, I=20 won't know quite what I'll try. 
 
Thanks,
Rusty
 
 
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