This is of interest, considering the dual electric fan setup on the
turbo...
Ciao,
Francois Dion (francois@hyperreal.org)
-- Member: FLU #1722, PCNA http://www.fortunecity.com/silverstone/zagato/101/launch.html Alfa Romeo, Fiat, Lancia, Peugeot, Volvo, Solex
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Delivered-To: francois@hyperreal.org Return-Path: diy_efi-owner@esl.eng.ohio-state.edu Received: (qmail 11969 invoked from network); 5 Aug 1998 19:48:06 -0000 Received: from esl.eng.ohio-state.edu (mail@128.146.90.233) by taz.hyperreal.org with SMTP; 5 Aug 1998 19:48:06 -0000 Received: (from mail@localhost) by esl.eng.ohio-state.edu (8.8.7/8.8.7) id PAA19606 for diy_efi-outgoing; Wed, 5 Aug 1998 15:15:24 -0400 X-Authentication-Warning: esl.eng.ohio-state.edu: mail set sender to owner-diy_efi using -f Received: from algw1.lucent.com (algw1.lucent.com [205.147.213.1]) by esl.eng.ohio-state.edu (8.8.7/8.8.7) with SMTP id PAA19601 for <diy_efi@efi332.eng.ohio-state.edu>; Wed, 5 Aug 1998 15:15:19 -0400 Received: from nwmail.wh.lucent.com by alig1.firewall.lucent.com (SMI-8.6/EMS-L sol2) id PAA06362; Wed, 5 Aug 1998 15:34:28 -0400 Received: by nwmail.wh.lucent.com (SMI-8.6/EMS-1.4 sol2) id PAA23849; Wed, 5 Aug 1998 15:14:56 -0400 Received: from lucent.com by nwmail.wh.lucent.com (SMI-8.6/EMS-1.4 sol2) id PAA23846; Wed, 5 Aug 1998 15:14:56 -0400 Message-ID: <35C8AE37.63F4D21D@lucent.com> Date: Wed, 05 Aug 1998 15:10:47 -0400 From: Ken Kelly <kenkelly@lucent.com> Organization: Lucent Technologies X-Mailer: Mozilla 4.03 [en]C-EMS-1.3.1 (WinNT; U) MIME-Version: 1.0 To: diy_efi@efi332.eng.ohio-state.edu Subject: Re: Two cooling fans (was: 165 question) References: <ce2f2750.35c51aae@aol.com> <35C56930.9E0E7DD8@post.almac.co.uk> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-diy_efi@efi332.eng.ohio-state.edu Precedence: bulk Reply-To: diy_efi@efi332.eng.ohio-state.edu
The new camaro F body uses a variation of the two fan Theme. When you reach the low temp fan limit the two fans are put in series, so they both run at 1/2 the battery voltage voltage, and speed. It makes them much quieter and more effecient than running one on only a part of the radiator. When the second temp limit is reached it uses relays to put each fan accross the battery supply, so they both run at high speed.
Ken
Andrew W. Macfadyen wrote: > > Some manufacturers use this system I know the UK Rover use it in the higher > performance turbo and V6 models in the 800 range. If you want to take the > electronic route you could do it several ways using a temperature sensor (such > as a thermistor or LM335 sensor) connected to a simple voltage comparator (you > would also need some kind of timer bassed on 555 chip) or a better one chip > solution in the form of the Analog Devices TMP12FP chip which is designed for > use in Pentium PC and actually measures airflow and temperature. > > Andy MacFadyen > > AL8001@aol.com wrote: > > > In a message someone wrote: > > > > >>Wanted to have two fans in pu that came on at > > >>>different temps. Have some minor drivabilty problems in really hot weather > > >>>- hope to have ecm do controlling of fans instead of wiring to have come > > >>>with eng running. > > >>> > > > > It dosn't have to that complicated (searching for a ecm output and table ). > > Look in a auto parts catalog for a water temp switch used for a hot light. > > Many have a small screw covered by paint or sealer. Most of the older Ford > > sensors have a threaded stud with a flat on one side. > > > > Clean off the paint, then turn the screw two turns clockwise. Most engines > > have extra pluged holes in the intake or cylinder heads. Connect the switch to > > the relay for the second fan. Run the engine and adjust the screw to the temp > > you desire. > > > > Simple, easy and cheap.
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