Downhill : neutral or coast in gear

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Originally Posted by string

Did you do my hill experiment? A video of the test (with sound) would be superb. I tend not to believe what your computer is telling you (and then me). I'd rather you do the hill test and hear your fuel being combusted instead.

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It's probably diagnostic information from the OBD II port. How more accurate do you want to be? Hehe.

Some cars can shut off the injectors, while others can't. In his case, his car can.

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Originally Posted by string

Did you do my hill experiment? A video of the test (with sound) would be superb. I tend not to believe what your computer is telling you (and then me). I'd rather you do the hill test and hear your fuel being combusted instead.

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Ahh string so it was you,couldnt find that thread for the life of me.

I hope u read me right,that u were the only one tryin to have a civil discussion before the imbociles stepped in.

Anyway,aarong the info is a hondata data log.

I know what your sayin about the engine note string (no i havent tried it,combo of living in peak hour hell & car off the road atm) thats why i asked originally,it confused me also when i found this out & i thought about what sounds the engine would make.

Honda states the info clearly that they shut the injectors off for fuel economy above about 1000rpm(varies slightly between models) & closed throttle.

The datalogs i have confirm this on every single occassion,thats just a 10 sec snip of about & hours worth of logs.

There is definitely no fuel passing thru the injectors,zero firing time & zero duty cycle,thats why i wanted someone to originally explain to me why the engine sounds like its still firing or does it just seem that way.

The engine is still compressing and exhaling air through the valves and exhaust so there would have to be a sound of somesort. Also, the spinning action of the crank and camshafts would have its own noise through friction.

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Originally Posted by JasonGilholme

The engine is still compressing and exhaling air through the valves and exhaust so there would have to be a sound of somesort. Also, the spinning action of the crank and camshafts would have its own noise through friction.

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This is what I was alluding to. Have you ever tried to clutch start a car down a hill? The sound you get from that is completely different to cruising down a hill off throttle. One just sounds like air flapping around, the other sounds like tiny bits of fuel being combusted.

I have no doubts that you datalogs are correct, and that yours (and my) car is supposed to cut injector pulse to 0ms, however, you cannot argue with the different sound, which is where my disbelief arises.