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06-13-2008, 11:13 PM
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#1 (permalink) | ||||
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King Detail
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Using 3 or 4 cylinders to save gas in a 3S
Not sure this is in the right place for this, but it seems like it. Move if not.
IE: The new Dodge Charger among some other vehicles use whats known as a "multi-displacement system" or for Hondas "variable cylinder management". Multi-Displacement System - Wikipedia, the free encyclopedia Variable Cylinder Management - Wikipedia, the free encyclopedia Put simply can we do this with our cars in some simple fashion like unplugging 3 plug wires and 3 injector wires? or would it require a monumental undertaking to re-engineer the 3S engine bay? Ultimately what would it take and ideally instead of allowing the computer to decide for me when to toggle the feature how about a button or switch so I can decide when I want more power vs economy?
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06-13-2008, 11:17 PM
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#2 (permalink) | |
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Goddamn lifter tick.
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Re: Using 3 or 4 cylinders to save gas in a 3S
The car has to be engineered from the ground up to do that. Essentially if you unplug three injector wires your car will just run like absolute shit if it even does run and you will get ridiculously terrible gas mileage.
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"I have no fear of death. It just means dreaming in silence. A dream that lasts for eternity."
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06-13-2008, 11:25 PM
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#3 (permalink) |
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Verified Seller
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Re: Using 3 or 4 cylinders to save gas in a 3S
Vehicles that are engineered to use this type of technology disable the valvetrain so that there are no pumping losses.. Not something that can be done to vehicle where it wasn't intended.
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Because One broken Stealth just wasn't enough...  I made twins.. |
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06-14-2008, 03:56 AM
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#5 (permalink) | |
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SOHC you in the FACE
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Re: Using 3 or 4 cylinders to save gas in a 3S
Quote:
Our firing order is 123456. you cut one bank and you have 135 or 246 According to the crankrotations this is still smooth operation. Real Mccoy correctly points out the pumping losses. To me the pumping losses seem like they would overcome any potencial gains. That said, I know someone doing this on a 6g72 in his minivan. He has an old van that runs batch fired injectors so he only needs 1 switch to kill 3 cylinders. He claims fairly serious mileage gains. I dont know that I believe without testing myself. It might be him driving super conservatively because his van on 3 cylinders is gutless. I dont know how he can gain 5-8mpg on the freeway in a minivan driving conservatively though. My problem with this is that you would need to swap banks every once in awhile to help stop the plugs from fouling (vacuum puling oil into cylinders). I wanted to try it for fun but sequential injection requires a much fancier switch. If someone wants to buy me a switch that can cut 3 separate wires with one throw (and I want two so I can swap banks to clean the plugs) then I would have plenty of fun trying it out. I love collecting data.
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Brent
1992 Duster -12.7@114 - 14psi boost -13.9@107.4 - 5psi - 6g72 3.13L "built" SOHC, Precision T67 P-trim, Tial 38mm open dump, 3" downpipe, 20x12x3" evo style intercooler, 7:1 compression, balanced, shot peened rods, heavily ported heads (+40% on flowbench), Ferrea Competition Plus +2 +1 stainless valves, Nielson Vintage 278 duration custom turbo cams, RPW Cam gears, Custom Ram Style short runner intake manifold, Walbro 255hp, 6*47# injectors, +0.096" Forged Venolias, Total Seal chrome gapless top rings, Fidandza Flywheel, Clutchnet 3 puck solid hub, OBX Helical LSD, Zeitronix wideband/EGT/Boost sensors, 100watt DevilsOwn Meth Kit. 1994 Spirit - 13.987@101.89 - 5psi- 6g72 SOHC, K27 Turbo  Last edited by Ondontii : 06-14-2008 at 04:03 AM. |
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06-14-2008, 04:06 AM
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#6 (permalink) |
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SOHC you in the FACE
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Re: Using 3 or 4 cylinders to save gas in a 3S
1987 voyager with displacement on demand... - TurboDodge.Com - Turbo Dodge forum for Turbo Mopars, Shelbys, Daytona, SRT-4, PT Cruiser, Omni and more!
Interesting thread. Some of the issues he has are dealing with auto trans and whether or not the torque converter is locking up. The most interesting issue was that your o2 sensors will be all screwed up, especially if you only have 1 o2 sensor for the whole motor. if you have two, you could splice the signal from the bank that is running to the bank that is not running. Another means could be modification of the o2 signal so that the computer doesn't try to add more fuel because it thinks you are lean. That would require some hard to build electrical devices because you have to increase voltage instead of dropping it. |
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06-14-2008, 04:30 AM
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#7 (permalink) |
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Member: Burned valve club
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Re: Using 3 or 4 cylinders to save gas in a 3S
Alt plan for reducing pumping losses using EGR.
http://global.mitsubishielectric.com...ol87/87tr6.pdf Exhaust gas recirculation - Wikipedia, the free encyclopedia
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1991 Stealth RT/TT - Firestorm Red - 193K Miles / Original Owner
Maint: Castrol 10W40 / Mitsu Filter / Rislone Replaced: 2X clutch / 3X brakes / 2X front rotors / 2X ABS HU / 1X NGK Plugs / 1X Ball joints / 2X Antenna mast / 1X Active exhaust cable / 1X Windshield / 1X Fuel FIlter / 1X Struts / 1X rear rotors / 1X Front Head / VSS / 1X rear wheel bearings / 1X Transfer case (warranty) / 1x Tie rod end (drivers side) Overhauled: Starter, IAC, BISS, CV Boots Upgrade: SilverStar Headlights / ebay "Xenon" Fog Bulbs (no more yellow!) A/F Gauge / MAP - Electronic Boost Logging / MMCd Data Logger Pending Projects: Steering Rack |
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06-14-2008, 04:50 AM
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#8 (permalink) |
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Forum user
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Re: Using 3 or 4 cylinders to save gas in a 3S
My RT/TT gets great mileage compared to my other cars. What kind of mileage are you looking for ?? Stay out of the turbos and you can up your mileage a good deal. Viper gets about 15mpg, Hemi Truck about 14-15 (on the road).Mustang (pro-charger) about 20mpg on the road if I say out of the supercharger, RT/TT about 25 on the road. A/F crusing with the RT/TT is running 14.5.
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Not to old to have fun - yet ??? -
2007 Dodge SRT-8 Superbee 2007 Hemi Quad Cab 4X4 2006 Harley V-Rod , 1999 S&S 1200 Sportster 2005 H/D FatBoy(Stage II),1973 BMW R75/5 restored 2004 Ducati Monster SR2,1972 BMW R75/5 restored 2004 Ford MACH I Mustang, Pro-Charger 535 RWHP 2002 Viper SRT-10,2000 Custom 883 Sportster 1992 Stealth RT TT (Stage III) 633.9 AWHP 1992 Stealth RT 1991 Stealth RT TT  and More |
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06-15-2008, 01:05 AM
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#10 (permalink) |
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Forum Member
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Re: Using 3 or 4 cylinders to save gas in a 3S
This is a creepy thead, just a few days ago i was thinking the exact same thing. It would be nice to have a switch on my dash where i could just cut half my cylinders and get amazing gas mileage. But you other guys make a good point, your pistons are still moving around causing trouble. Although by the sounds of it, i need the gas mileage improvement more then any of you guys, i have a 98 SL with just an intake and exhaust and i get 16 MPG! I cant freaken believe it, my brothers mustang GT gets better mpg then me
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