X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from zproxy.gmail.com ([64.233.162.195] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 920103 for flyrotary@lancaironline.net; Tue, 10 Jan 2006 08:51:34 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.162.195; envelope-from=barrygardner@gmail.com Received: by zproxy.gmail.com with SMTP id z3so4046567nzf for ; Tue, 10 Jan 2006 05:50:49 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:user-agent:x-accept-language:mime-version:to:subject:references:in-reply-to:content-type:content-transfer-encoding; b=Irwl3+1xtOpbOYFMdp81FfiWn6a7Jyua9vrVVBXaS6Bzn4Und1N3ZiBjmaLypgV+MzT32Ygpmx7MGKzS2aA6fPhv+aQEZFB5Vg0VWI9i+6eNbB2eA9ojFs6m4O5HMQNJUb7xsHuZFqEmThcltvk8jEF/IYhMJt8GcC5Ff/F/02E= Received: by 10.36.227.30 with SMTP id z30mr515491nzg; Tue, 10 Jan 2006 05:50:49 -0800 (PST) Return-Path: Received: from ?192.168.1.102? ( [68.255.29.190]) by mx.gmail.com with ESMTP id 24sm1658810nzn.2006.01.10.05.50.48; Tue, 10 Jan 2006 05:50:49 -0800 (PST) Message-ID: <43C3BBB3.8000907@gmail.com> Date: Tue, 10 Jan 2006 07:50:43 -0600 From: Barry Gardner User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Runaway Turbos References: In-Reply-To: Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Buly,

I can only echo what Rusty said about "danger, danger." You've got runaway boost, irrespective of the fact that you removed the wastegate. The wastegate size is not sufficient to get rid of all the boost you're producing. That boost past 30" MP makes the turbo go even faster, which feeds back even more to the insufficient wastegate--it's a recursive cycle that takes you to that very high boost level very quickly. All the racer boys working with the stock turbo complain about it.

All that boost requires tons of fuel. Think .65 BSFC, guess what horsepower you're producing at that boost level and figure out how much fuel you need to deliver. Then re-check all your bottlenecks: fuel injector sizes, fuel pressure, pump sizes, fuel computer programming, everything,

You need to be able to control that boost, friend. It could go uncontrollably lean on you and....

The symptoms all tell the same story.

Barry Gardner
Wheaton, IL

87 TII sitting on my driveway


Bulent Aliev wrote:
I ran yesterday my engine with John inside the plane and noticed something that John said is happening to his stock turbo too. After 30" of MP pressure the turbo sometimes goes to 40-46", but suddenly the MAP jumps to 50-60. It happened today also? 
Another thing my engine is running very lean at high MAP with the mixture knob all the way  rich? My exhaust inside changed from being wet black to almost shiny clean. The white prop has no trace of carbon. I think i should change the injector programing on mode 3 ? I wander if Dave or steve had similar experience?

Bulent "Buly" Aliev