slimjim Posted April 16, 2011 Share Posted April 16, 2011 Quick question... If you are engine braking in the Zed.... Are you using fuel? Couple of the newer cars (most of the NEW cars) have a feature that you use little if not NO fuel when using the engine for braking... Is this like this in the Zed? Im presuming not, but thought I'd as the question Quote Link to comment Share on other sites More sharing options...
AK350Z Posted April 16, 2011 Share Posted April 16, 2011 No fuel gets used if it's still in gear. Only if its idling out of gear. Quote Link to comment Share on other sites More sharing options...
slimjim Posted April 16, 2011 Author Share Posted April 16, 2011 Even on my old 2003 model? Quote Link to comment Share on other sites More sharing options...
AK350Z Posted April 16, 2011 Share Posted April 16, 2011 Certainly every fuel injected car that i know of. Don't know about carbs! Quote Link to comment Share on other sites More sharing options...
Stroudy Posted April 16, 2011 Share Posted April 16, 2011 The MPG computer on my daily driver (Pug 307) and work van go to 99.9 mpg when engine braking so i'd certainly say it uses little or no fuel at all Quote Link to comment Share on other sites More sharing options...
Chris`I Posted April 16, 2011 Share Posted April 16, 2011 370z definately uses no fuel as the real time gauge goes off the scale! Given the 350z isnt a whole lot different, I would say its the same Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 16, 2011 Share Posted April 16, 2011 how does it still make a noise though if the engine isnt pumping fuel in? Surely the engine would go quiet too? I know its still being compress but no fuel? Quote Link to comment Share on other sites More sharing options...
JetSet Posted April 16, 2011 Share Posted April 16, 2011 It's really difficult to pin down an answer to this, so I'm not giving any opinion. There are several reasons given why it must use some fuel firstly to avoid detonation and secondly to avoid catalyst damage. Others say no fuel at all is used. One answer I saw avoided the question altogether by saying that you should use your brakes because they're cheaper to replace than gearboxes . Apparently in days of old engine braking was essential as on long downhills brakes would overheat and even catch fire Pete Quote Link to comment Share on other sites More sharing options...
mc Posted April 16, 2011 Share Posted April 16, 2011 I think it uses less or the same amount of fuel as if the engine is idling, because the throttle is 'shut' and you're trying to slow to idling speed? although the throttle may not be totally closed? I thought you need a little bit of fuel to help lubricate the pistons? I think there's an engine I've heard of that can 'shut down' half the cylinders if you're driving economically? Quote Link to comment Share on other sites More sharing options...
Chris`I Posted April 17, 2011 Share Posted April 17, 2011 I think there's an engine I've heard of that can 'shut down' half the cylinders if you're driving economically? A lot of modern V8s can do this as its very easy to cycle just 4 cylinders and make it a 4 pot. I think a few of the big yank tanks do this. All F1 cars now do this too, apparently some of them can run on cycling even less cylinders I'm sure they said yesterday in qualifying. Quote Link to comment Share on other sites More sharing options...
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