Wheews, it's been awhile since i've posted and I know most likely I should just search this question but I haven't found the answer yet and i don't feel like searching too long so i've decided to just ask you guys...

I remember the question i asked before about the concepts of vtec in which i was rerouted to the Why stuff works website...after reading that and talking to people at school i understand the basic concepts of it now...

but the popularity of RSX's at my school has brought up the subject of Ivtec... the only thing i really know about it, well i hope, is that the DOHC are controlled by computer rather than just the cam profile???? I'm just curious about it and my class doesn't teach Cams in depth like that...

 

every computer is run by computer

 

hey bud vtec is not controlled by cams, its oil pressure. anyhow IV-TEC is supposedly better for the around town driver due to better midrange then regular VTEC. do a google search and you can learn lots.

 

My mistake i just though the oil pressure causes the cam to switch over...

 

i vtec has the vtec fuction, switching to a more aggressive cam profile when you are revving higher. it also adds adjustable intake cam timing. so it has different cam timing through out the rev range also.

 

I think the biggest benifit of Ivtec is the lovly torque curve it gives compared to oldskool vtec :chuckles:

 

i'm not sure what you meant by the DOHC being controlled by the computer??? its the computer that sends a signal to engage the Vtec solenoid and kick the pin to lock the rocker arms so the more aggressive cam lobes take over.

i believe that iVtec uses this method in addition to varying the timing far more by advancing or retarding the spark timing by +/- 20 degrees. with this new element, we can all see how the iVtec has lots of potential in tuning and why the Vtec cross over is smoother than regular Vtec.

anyone please add or correct... i'd like to know more advantages and disadvantages of iVtec... :goodjob:

 

pretty sure your correct Laubo, I saw a sheet on the iVTEC technology when the k20 was introduced online.. I cant remember the site, but im pretty sure you summed it up ^_^

 

Yup I think you pretty much got it all

 

actually its the computer that controls the vtec system cause even if the oil pressure is there and the rpms are there the computer wont activate the solenoid unless you are going at least 25mph and are up to operating temp. but technically the oil pressure and cams work in unison to create vtec.