carl0s Posted May 3, 2004 Share Posted May 3, 2004 With suitable ECU modifications (AEM ?) would it be possible to run the engine on only three of it's six cylinders for improved fuel economy? Would it work and would it in theory offer any benefit for motorway cruising? Perhaps the cams have to be designed in a specific way to allow full revolutions with only half of the cylinders providing movement? any ideas? Quote Link to comment Share on other sites More sharing options...
LeeT Posted May 3, 2004 Share Posted May 3, 2004 buy a nissan micra:p Quote Link to comment Share on other sites More sharing options...
carl0s Posted May 3, 2004 Author Share Posted May 3, 2004 seriously if we could get decent economy, the supra would be a much more acceptable car. Practicality isn't an issue, and it's a great long distance motor, but £20 a day is too much. Quote Link to comment Share on other sites More sharing options...
LeeT Posted May 3, 2004 Share Posted May 3, 2004 when people buy the supra they know its a 3 litre car and accept its not going to be economical. thats why the majority of people on here dont use their supras as daily drivers. i dont think you will ever noticably increase the MPG so maybe the supras just not for you. Quote Link to comment Share on other sites More sharing options...
JamesG Posted May 3, 2004 Share Posted May 3, 2004 It would be totally impractical and the engine would sound very rough, but it's not actually a ridiculous idea. I've heard of a race series that does this in certain situations for fuel economy. James. Quote Link to comment Share on other sites More sharing options...
carl0s Posted May 3, 2004 Author Share Posted May 3, 2004 I know it's not ridiculous! Some modern 6/8 cylinder engines do exactly this. I'm just wondering if it would work for the 2JZ-GTE. Quote Link to comment Share on other sites More sharing options...
JamesG Posted May 3, 2004 Share Posted May 3, 2004 Originally posted by carl0s I know it's not ridiculous! Some modern 6/8 cylinder engines do exactly this. I'm just wondering if it would work for the 2JZ-GTE. I didn't know this. Has it been used on any road cars? James. Quote Link to comment Share on other sites More sharing options...
carl0s Posted May 3, 2004 Author Share Posted May 3, 2004 yeah. I read of it ages ago. Not sure what cars though :-) I did just find this though it's rather 'cutting edge': http://forums.pickuptruck.com/showflat.php?Cat=&Board=04NAIAS&Number=336378&Main=315726 and this from Honda. It seems the proper term is "cylinder deactivation". http://www.auto-report.net/index.html?j30avcm.html Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted May 3, 2004 Share Posted May 3, 2004 Originally posted by JamesG I didn't know this. Has it been used on any road cars? James. Cadillac did this about 20 years ago in an attempt to extract more economy from their (350ci (5.7 litre) I think) V8. All in all its not a bad idea, but for a performance car like the Supra would be totaly wasted on 95% of its buyers Quote Link to comment Share on other sites More sharing options...
JamesG Posted May 3, 2004 Share Posted May 3, 2004 That's interesting. On that Honda it says it disables one of the banks of the V6. I guess as well as turning off the fuel injectors it somehow lifts up the cam so it doesn't lift the valves. Not only that but it has an extra mass somewhere to reduce vibration. Sadly, the Supra has an I6 and none of that extra gubbins, so your dream of eleventy-million miles per gallon will never be fulfilled James. Quote Link to comment Share on other sites More sharing options...
carl0s Posted May 3, 2004 Author Share Posted May 3, 2004 heh eleventy-million. I had to think for a while if that was a real number or not :-) It's just that I'm questioning my plans to sell the Supra. It does something for me that no other car could. Maybe I'll get lucky and do enough work to be able to buy a pug 306 diesel for a couple of grand and still use the Supra for fun. Quote Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted May 3, 2004 Share Posted May 3, 2004 go to a auction buy a 1 litre old E reg fiesta with 5 months tax and mot for bout £300 and use that for now. I wish i kept mine, for a MOT all it needed was a £3 washer replaced...those where the days.....wait up im 21 hows the repair going?? and as the engine is inline i dont think it would work as all valves etc... would still be going round with the engine. at least the block is strong enough to take more vibration and i guess it would sound beefy....but very ill Quote Link to comment Share on other sites More sharing options...
carl0s Posted May 3, 2004 Author Share Posted May 3, 2004 repair's going okay. Following on from what someone else said in the original thread, I've decided to stop lying to everyone and fess up that it was just the door that was damaged. It was only a little prang after all but since Brian (Soop Dog) offered me a new door for £115 delivered I decided to put a new one on. It wasn't a bad crash or anything and any prospective buyers have nothing to worry about do they. Just a door. OK? Quote Link to comment Share on other sites More sharing options...
Digsy Posted May 3, 2004 Share Posted May 3, 2004 You can do it on an I4 as well, although it would be another degree rougher. I know Cadillac have been using this trick for ages,. Sounds like the VTEC engine has a good few trick bits up its sleeve to make it more user friendly. Especially the engine mount and active noise cancellation. You couldn't do it by simply switching off the injectors because of the pumping losses thing - which is mentioned in the Honda article. Quote Link to comment Share on other sites More sharing options...
martynb Posted May 3, 2004 Share Posted May 3, 2004 Some of the big Merc engines do this as well, although they had a lot of problems with it initially. They even rotate which cylinders are "dead" to prevent problems with them going stone cold. they had planned to do it with some of the smaller V6 blocks as well but they had so many problems with the engine management on those anyway I'm not sure whether they ever went ahead. Quote Link to comment Share on other sites More sharing options...
Syed Shah Posted May 4, 2004 Share Posted May 4, 2004 It is a clever idea, but it won't be possible to add it to a 2JZ, if you had the money to do it, petol prices wouldn't concern you. Quote Link to comment Share on other sites More sharing options...
cg084 Posted May 4, 2004 Share Posted May 4, 2004 Originally posted by carl0s With suitable ECU modifications (AEM ?) would it be possible to run the engine on only three of it's six cylinders for improved fuel economy? Would it work and would it in theory offer any benefit for motorway cruising? Perhaps the cams have to be designed in a specific way to allow full revolutions with only half of the cylinders providing movement? any ideas? As far as running on 3 is concerned you would have to cut off the injectors and the ignition to the plugs. Not a very mechanical mind but i would think that to do this would cost loads too. I use mine daily doing about 60 miles a day. Costs me about 45 squid a full tank every week. Not that bothered. Since i was getting about 28mpg. I dont drive with a lead foot very often though. Craig. Quote Link to comment Share on other sites More sharing options...
womble Posted May 4, 2004 Share Posted May 4, 2004 Why not try driving it with only three wheels on to save on tyre wear whilst you're at it . Quote Link to comment Share on other sites More sharing options...
CJ Posted May 4, 2004 Share Posted May 4, 2004 Originally posted by womble Why not try driving it with only three wheels on to save on tyre wear whilst you're at it . PMSL Quote Link to comment Share on other sites More sharing options...
Lewis Posted May 4, 2004 Share Posted May 4, 2004 you could always tow it everywhere with a 1970 volvo estate diesel I am sure the [jeremyclarkson]eleventy million[/jeremyclarkson] mpg you get there would easily outweight the cost of driving the supra, then if you drove the volvo on its side using a stabiliser bar at the rear for the trailer, and only took both cars out alternate weekends and used piss + vegetable oil in the volvo to power it and sell your house and live in a field with hippies...... Then all your problems would be solved Glad I could help Quote Link to comment Share on other sites More sharing options...
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