What is the difference of the VTEC and I-VTEC ?
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Re: What is the difference of the VTEC and I-VTEC ? (Ferrell)
VTEC basically has 2 cams, low lift, and high lift (yes I know a lot more than that). When "VTEC" kicks in, it simply switches from low to high. Easy as that.
This intellegent VTEC **** is a little different. There are still 2 sets of cam lobes, but just before engagement, something happens with the rocker arms to allow it to engage more smoothly, (not sure exactly what)
I think.
This intellegent VTEC **** is a little different. There are still 2 sets of cam lobes, but just before engagement, something happens with the rocker arms to allow it to engage more smoothly, (not sure exactly what)
I think.
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Re: What is the difference of the VTEC and I-VTEC ? (EpDarks)
wrong, all i-VTEC is is VTEC with VTC on the intake cam to advance or retard timing
* from the RSX brochure
"i-VTEC features Variable Timing Control (VTC) a new device between the intake camshaft and its drive sprocket that can advance and retard cam timing in infinitely small degrees, always matching valve timing perfectly to engine requirements"
[Modified by WR93EG, 11:34 PM 11/5/2002]
* from the RSX brochure
"i-VTEC features Variable Timing Control (VTC) a new device between the intake camshaft and its drive sprocket that can advance and retard cam timing in infinitely small degrees, always matching valve timing perfectly to engine requirements"
[Modified by WR93EG, 11:34 PM 11/5/2002]
#7
Re: What is the difference of the VTEC and I-VTEC ? (tone*def)
OK, considering that nobody has quite hit the nail on the head yet...
i = intelligent in iVTEC. what's so intelligent about it? the fact that the timing is now continuously adjustable based on engine rpm, throttle position, load, inlet air temp, etc. iVTEC has 4D (as opposed to 3D) fuel maps too, which the engine will switch between the 6 maps depending on any one of its input parameters. this has also lead to part of the problem with dynos for the K20. a slight variance in temp may cause the maps to be swtiched, therefore making it difficult to see consistent gains.
i = intelligent in iVTEC. what's so intelligent about it? the fact that the timing is now continuously adjustable based on engine rpm, throttle position, load, inlet air temp, etc. iVTEC has 4D (as opposed to 3D) fuel maps too, which the engine will switch between the 6 maps depending on any one of its input parameters. this has also lead to part of the problem with dynos for the K20. a slight variance in temp may cause the maps to be swtiched, therefore making it difficult to see consistent gains.
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Re: What is the difference of the VTEC and I-VTEC ? (F1HONDA)
OK, considering that nobody has quite hit the nail on the head yet...
i = intelligent in iVTEC. what's so intelligent about it? the fact that the timing is now continuously adjustable based on engine rpm, throttle position, load, inlet air temp, etc. iVTEC has 4D (as opposed to 3D) fuel maps too, which the engine will switch between the 6 maps depending on any one of its input parameters. this has also lead to part of the problem with dynos for the K20. a slight variance in temp may cause the maps to be swtiched, therefore making it difficult to see consistent gains.
i = intelligent in iVTEC. what's so intelligent about it? the fact that the timing is now continuously adjustable based on engine rpm, throttle position, load, inlet air temp, etc. iVTEC has 4D (as opposed to 3D) fuel maps too, which the engine will switch between the 6 maps depending on any one of its input parameters. this has also lead to part of the problem with dynos for the K20. a slight variance in temp may cause the maps to be swtiched, therefore making it difficult to see consistent gains.
I had almost 20hp difference between my dyno runs, one on a 100F day, the other on a 55F day.
I will say that I did also see a 4-5 hp gain on the 55F day, after I had disconnected the battery to 'reset' the ECU. I assume this action causes the ECU to delete learned behavior for fuel economy purposes?
#9
Re: What is the difference of the VTEC and I-VTEC ? (nc-rsx-s)
I had almost 20hp difference between my dyno runs, one on a 100F day, the other on a 55F day.
I will say that I did also see a 4-5 hp gain on the 55F day, after I had disconnected the battery to 'reset' the ECU. I assume this action causes the ECU to delete learned behavior for fuel economy purposes?
I will say that I did also see a 4-5 hp gain on the 55F day, after I had disconnected the battery to 'reset' the ECU. I assume this action causes the ECU to delete learned behavior for fuel economy purposes?
As far as disconnecting the battery. It makes sense to do it after installing power mods, but not on the dyno really. Unless you want to skew the dyno into giving you a raw max power number just for the sake of getting the dyno to read higher, in reality you wont be resetting the ecu while driving around town, so that 4-5 hp gained after resetting the ecu doesn't really exist once the ecu relearns fuel settings and integrates more fuel economy back into its program.
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