X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 29 Aug 2009 13:21:57 -0400 Message-ID: X-Original-Return-Path: Received: from asp-3.reflexion.net ([205.237.99.178] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with SMTP id 3828107 for lml@lancaironline.net; Fri, 28 Aug 2009 20:20:22 -0400 Received-SPF: none receiver=logan.com; client-ip=205.237.99.178; envelope-from=cberland@systems3.net Received: (qmail 25365 invoked from network); 29 Aug 2009 00:19:47 -0000 Received: from unknown (HELO asp-3.reflexion.net) (127.0.0.1) by 0 (rfx-qmail) with SMTP; 29 Aug 2009 00:19:47 -0000 Received: by asp-3.reflexion.net (Reflexion email security v5.60.10) with SMTP; Fri, 28 Aug 2009 20:19:47 -0400 (EDT) Received: (qmail 25342 invoked from network); 29 Aug 2009 00:19:46 -0000 Received: from unknown (HELO systems3.net) (98.172.79.178) by 0 (rfx-qmail) with SMTP; 29 Aug 2009 00:19:46 -0000 Content-class: urn:content-classes:message Subject: [LML] IV-P Manifold Pressure Problem MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CA283E.699AD0DC" X-Original-Date: Fri, 28 Aug 2009 17:19:45 -0700 X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Message-ID: <87C33F695961494D886EB3B6C8A4765164370A@s3server.Systems3.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] IV-P Manifold Pressure Problem Thread-Index: AcolbVSevr5cQo4zR+6/2vmZliX0BwAKA7NgAKmJCnAAALWdUA== From: "Craig Berland" X-Original-To: "Lancair Mail List" This is a multi-part message in MIME format. ------_=_NextPart_001_01CA283E.699AD0DC Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable =20 I thought I would share the solution to my boost control problem which included a runaway over boost at takeoff and a wondering non-controlled boost in level, climb and descent cruise flight. =20 I found through testing the wastegate did not have the capacity to bypass enough exhaust and the turbos were therefore uncontrollable. Gary at Main Turbo out of California was a huge help and found a different wastegate with the same footprint but a larger ID. The new part arrived today, was high speed taxi tested and then flown. The two hour flight was perfect and the problem seems to be solved. =20 I must point out I have changed several parts in the turbo system including custom intercoolers, custom tailpipes, removal of the tailpipe restrictor and my own sonic nozzles. However, the sonic nozzles are made to the Piper Mirage inside dimensions. I also have the large Mirage compressors, 8.5 to 1 CR and an experimental camshaft. I am now adding a larger ID wastegate to the list. =20 Craig Berland N7VG =20 ------_=_NextPart_001_01CA283E.699AD0DC Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I thought I would share the solution to my boost control = problem which included a runaway over boost at takeoff and a wondering = non-controlled boost in level, climb and descent cruise = flight.

I found through testing the wastegate did not have the = capacity to bypass enough exhaust and the turbos were therefore uncontrollable. = Gary at Main Turbo out of California was a huge help and found a different = wastegate with the same footprint but a larger ID. The new part arrived = today, was high speed taxi tested and then flown. The two hour flight was = perfect and the problem seems to be solved.

I must point out I have changed several parts in the = turbo system including custom intercoolers, custom tailpipes, removal of the = tailpipe restrictor and my own sonic nozzles. However, the sonic nozzles = are made to the Piper Mirage inside dimensions. I also have the large = Mirage compressors, 8.5 to 1 CR and an experimental camshaft. I am now = adding a larger ID wastegate to the list.

Craig Berland

N7VG

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