Does VTEC work differently if you slowly accelerate past 6k as opposed to pushing the pedal to the floor? From observation it would appear so, however, I am interested in knowing if this is technically true.

Thanks.

 

It still "works" the same since the sliding pin is still engaged, but it certainly won't feel as powerful.

 

Vtec is either on or off, either you're on the mild lobes or you're on the wacky lobes. The only difference felt is in throttle position.

 

Makes sense guys. The big difference in feel is what made me wonder.

Thanks!

 

I can't find a reference in the shop manual but the VTEC kicks in at a higher RPM if the throttle isn't wide open on a Prelude. I suspect the same thing is true here...

 

Well think about it... you have just forced the valves to open further and for a longer duration... which does not do much unless... you give it the fuel to feed the flames. The magic is that is can do this... what you choose to do with it is up to you.

 

Red_s2k - You provided a very clear explaination of the mechanics behind the subjective experience of VTEC under full throttle and not under full throttle. Well put.

[Edited by Dallas on 04-02-2001 at 08:56 PM]

 

I remember reding somewhere that VTEC workd on oil pressure.....so it depends on how much your givin' it

 

"I remember reding somewhere that VTEC workd on oil pressure.....so it depends on how much your givin' it "

the oil pressure just determines if it turns on or not... has no bearing on the amount of VTEC.

 

I don't think that the oil pressure "determines" whether VTEC turns on or not (except that if you're too low on oil, it won't work). I would say that it is determined by the computer sensing that the engine has exceeded a certain rpm. The computer uses oil pressure to actuate the pins that engage the high performance cam lobe followers. It seems to me that the factors used to determine "turn off" are a little more complex. It feels like, once VTEC is engaged, the rpm must drop significantly below 6000 rpm and stay there for more than half a second or so before it reverts back to the normal cam lobes. Does it feel that way to you?