drive by wire delay explained

[radiocontrolhead]

After each shift, or any sudden release of the throttle, the engine "burps,"
emitting high concentrations of exhaust emissions. The ECU has a delay,
or a map that allows the revs to drop slowly, in a controlled manner, to
reduce the amount of emissions emitted while revving-down.

[Gone]

and where exactly is this information coming from?

[radiocontrolhead]

good question... gti forums the audi a3 has the same problem and it's dbw. it makes a lot of sense acctually.

[Gone]

Oh, I'm not doubting you, just wondering. Yeah, it does make sense though. I'm kinda getting used to it now...

[Dmc]

Originally Posted by radiocontrolhead

After each shift, or any sudden release of the throttle, the engine "burps,"
emitting high concentrations of exhaust emissions. The ECU has a delay,
or a map that allows the revs to drop slowly, in a controlled manner, to
reduce the amount of emissions emitted while revving-down.

DBW doesn't "HAVE" to do that.. but for some reason *maybe emissions* honda did it.. the Sentra SE-R DBW doesn't have any lag at all..
too bad hondata doesn't wanna mess with the DBW settings on the ecu

btw.. what u r talking about is throttle hang... DBW lag is something else.. go race beside a RSX type R and u'll feel it.. its at the very second you step on the gas.. your car doesn't move till like 1/4 - 1/2 a second later.. this also occurs when you switch gears..

[Dale_K]

Yeah, not every car with DBW does this. None of the American cars I've driven with DBW have a throttle hang. The Subaru I used to own did it pretty much the same as the Honda so maybe it's a Japanese thing.

I read somewhere else Honda is going to provide a reflash for the engine computer for those folks who want it.

[Gone]

Originally Posted by Dmc

DBW doesn't "HAVE" to do that.. but for some reason *maybe emissions* honda did it.. the Sentra SE-R DBW doesn't have any lag at all..
too bad hondata doesn't wanna mess with the DBW settings on the ecu

btw.. what u r talking about is throttle hang... DBW lag is something else.. go race beside a RSX type R and u'll feel it.. its at the very second you step on the gas.. your car doesn't move till like 1/4 - 1/2 a second later.. this also occurs when you switch gears..

Who mentioned anything about lag? I think that was you.

Hes talking about the revs hanging after you let off the gas.

[Dmc]

Originally Posted by Gone

Who mentioned anything about lag? I think that was you.

Hes talking about the revs hanging after you let off the gas.

woops I must have misread the subject earlier that day

[radiocontrolhead]

lol, thats what i was thinking also. what were u talking about.

[PoLiShPrInCe]

Originally Posted by Dale_K

Yeah, not every car with DBW does this. None of the American cars I've driven with DBW have a throttle hang. The Subaru I used to own did it pretty much the same as the Honda so maybe it's a Japanese thing.

I read somewhere else Honda is going to provide a reflash for the engine computer for those folks who want it.

reflash the computer? is this true? wont this effect emissions?