Only on a car with a WBO2 sensor (and ECU that knows how to use it properly). The NBO2 sensors are nonlinear and their inflection point is not moveable. With an ECU that's designed to keep the sensor output toggling across the inflection point you'll end up with excessive oscillation in the A/F if you offset the sensor signal with a rheostat.
----- Original Message ----- From: Chris To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] Cc: [email protected] Sent: Sunday, June 01, 2008 8:10 PM Subject: RE: NPC: High MPG Miata Anyone think this o2 rheostat would work to any degree in saving gas? ------------------------------------------------------------------------------ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Sent: Saturday, May 31, 2008 7:34 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: [email protected] Subject: RE: NPC: High MPG Miata I wonder about my Miata. Put rheostat on o/2 sensor (cuts out at higher throttle/ open loop anyway?), and adjust to lean the mixture Also. Higher tire pressure Install cruise control ------------------------------------------------------------------------------ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Saturday, May 31, 2008 7:29 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: [email protected] Subject: Re: NPC: High MPG Miata I'm quite intrigued by your idea of DIY multiple displacement. I just don't think it will gain you much for the effort. Let me suggest a different angle. Lean burn. I can't find the article, but someone did a bunch of testing on a Honda Insight with a wide band, and discovered that the lean burn AFR's were much, MUCH leaner than previously thought. There is a lot of info about lean burn in general, and the Honda Insight specifically. Here's one: www.gassavers.org/showthread.php?t=2160 I suggest considering: low resistance tires (or at least blow 'um up tight) light weight wheels (obviously) water injection (for knock resistance) several sizes of water jets, or preferably a variable speed motor low octane fuel (obviously) 195* thermostat (want as complete a burn as possible) extra slippery lubricants in engine, tranny, & diff. (Obvious Man at work again) free-flow exhaust (maybe) scavenging header (maybe) hot range spark plugs wide band sensor (obviously) EGT gauge would be nice as well tune your Link so the cruising zones are considerably enleaned (experimentation required) Log your knock sensor and simply enlean ARF's slowly till knock, then add a bit more water. Repeat. When additional water will not quell the knock, back up to the previous settings. I think you could run on all 4 cyls and still get some decent mileage. Jim in Tucson In a message dated 5/30/2008 7:20:48 P.M. US Mountain Standard Time, [EMAIL PROTECTED] writes: I think that stopping the compression would be pretty hard to do. Maybe some VVT solution could be built with a newer Miata but I am looking at buying a $5 switch and running some wires, not completely re-engineering the ICE. Yes, the compression is definitely going to put a hurting on the two "running" cylinders. It should be fairly easy to test unless I am missing something (which is why I am asking before cutting any wires <G>). Yeah, probably nothing wrong with letting the spark go. It's not like I would be running the car like that for any length of time. My "test track" will be the 16.3 mile drive to work. It is made up of four 5 minute sections (separated by stop signs). During these sections it may be possible to kill the injectors for the 2-3 minutes of straight level road and do some coasting. On Fri, May 30, 2008 at 9:55 PM, derf <[EMAIL PROTECTED]> wrote: > If you could somehow stop compression in the two cylinders in > question, wouldn't that help with resistance? > If you could just shut off the injectors and release the compression, > then you might have something. > Miatas regularly run wasted spark so you could just let the spark go, eh? > -- Robert McElwee and Red Beast 1991 T25 Turbo @ 15 PSI Link ECU, FM IC, 9:1 pistons Over 400 lbs of "added lightness" www.lightweightmiata.com Lightweight Miata Forum: www.lightweightmiata.com/forum The Miata Trailer Project: www.lightweightmiata.com/trailer _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower ------------------------------------------------------------------------------ Get trade secrets for amazing burgers. Watch "Cooking with Tyler Florence" on AOL Food. ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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