Vtec activation
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Joined: Feb 2002
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From: Chicago, Il, US
In order for the ECU to initiate the VTEC system, 5 engine conditions must be met.
Temperature: The engine must have reached normal operating temperature.
Throttle Position: The throttle must be open far enough to allow for increased airflow in VTEC.
Vehicle Speed: The car must be in motion (wheels spinning).
RPM: Engine must spin to it's target value. The GS-R will send it's "GO" signal for VTEC at 4400 RPM while the Type R sends it's signal at 5700 RPM.
Oil Pressure: The engine must be operating with normal and safe levels of oil pressure determined by the VTEC pressure switch.
The ECU will send a signal for a spool valve to open. When this valve opens, oil is allowed into the pivot shaft inside the valve rockers and directed into the center rocker. Inside the center rocker, a set of pins are forced outward by the oil pressure and lock inside the rockers to both sides. This entire process occurs in 1/10 of a second.
-from surfer X-
Temperature: The engine must have reached normal operating temperature.
Throttle Position: The throttle must be open far enough to allow for increased airflow in VTEC.
Vehicle Speed: The car must be in motion (wheels spinning).
RPM: Engine must spin to it's target value. The GS-R will send it's "GO" signal for VTEC at 4400 RPM while the Type R sends it's signal at 5700 RPM.
Oil Pressure: The engine must be operating with normal and safe levels of oil pressure determined by the VTEC pressure switch.
The ECU will send a signal for a spool valve to open. When this valve opens, oil is allowed into the pivot shaft inside the valve rockers and directed into the center rocker. Inside the center rocker, a set of pins are forced outward by the oil pressure and lock inside the rockers to both sides. This entire process occurs in 1/10 of a second.
-from surfer X-
Joined: Mar 2003
Posts: 674
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From: ann arbor / detroit
i think its the other way around...GSR has the 2 stage intake mani, the type R head is the same as the B16 head which does not come with a dual stage intake mani...
the butterflies are pretty much what open up and create the dual stage intake...
see, when your car is in low RPM's, you dont want to lean it out so your GSR gets less air from the intake mani...then when you get up in the RPM's, your GSR wants all the air you can force at it so that butterfly opens up and creates a bigger opening for the air to flow through...get it???
the butterflies are pretty much what open up and create the dual stage intake...
see, when your car is in low RPM's, you dont want to lean it out so your GSR gets less air from the intake mani...then when you get up in the RPM's, your GSR wants all the air you can force at it so that butterfly opens up and creates a bigger opening for the air to flow through...get it???
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Re: (romeo619romeo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by romeo619romeo »</TD></TR><TR><TD CLASS="quote">my butterflies open at 6k stock ECU and all.. and vtec sounds like near 5k on my car.. 98 gsr to be exact</TD></TR></TABLE>
For the 713611th time, VTEC is 4400 on a Gen3 GS-R. Stop basing it on "noise".
For the 713611th time, VTEC is 4400 on a Gen3 GS-R. Stop basing it on "noise".
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s1ngle
Honda Civic / Del Sol (1992 - 2000)
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May 6, 2005 06:50 PM
