DOHC i-VTEC or DOHC VTEC better?

[Euro76]

I feel that Euro's K24A DOHC i-VTEC engine is great however I feel that it kicks more polite than the previous DOHC VTEC engine. I drove my friend's EK9 Civic VTi-R and when it kicks it feels so responsive. Has the DOHC i-VTEC engine loses the raw feeling of that DOHC VTEC engine? S2000 is the only car that is still equipped with original DOHC VTEC engine. Do you think DOHC VTEC engine is better than this DOHC i-VTEC engine?

[akina]

supposively... i-VTEC should be better because i... "intelligent", it is all computerised and the VTEC is able to kick in when ever it wants depending on how much you step down on the pedal whereas the normal VTEC it has to build up the pressure inside and only able to kick in at high revs. So basically, i-VTEC kicks in when ever it wants and VTEC needs to be at high revs.

[stephen8512]

long story short, the DOHC i-VTEC is hondas new breed of engine where honda focused not only on performance in keeping with the VTEC heritage but also fuel consumption. whack a K20A in ur mates civic and see if it still loses that "raw feeling"

and if ur mate has a VTiR civic, its an EK4. EK9 is a CTR.

[aaronng]

I feel that Euro's K24A DOHC i-VTEC engine is great however I feel that it kicks more polite than the previous DOHC VTEC engine. I drove my friend's EK9 Civic VTi-R and when it kicks it feels so responsive. Has the DOHC i-VTEC engine loses the raw feeling of that DOHC VTEC engine? S2000 is the only car that is still equipped with original DOHC VTEC engine. Do you think DOHC VTEC engine is better than this DOHC i-VTEC engine?

It doesn't matter if it is VTEC or i-VTEC. The thing that makes the "kick" is the difference in the two cam profiles. The Euro's low cam is more aggressive than the DC5R, but the high cam is milder. That's why there is little feeling when it switches to high cam.

[aaronng]

supposively... i-VTEC should be better because i... "intelligent", it is all computerised and the VTEC is able to kick in when ever it wants depending on how much you step down on the pedal whereas the normal VTEC it has to build up the pressure inside and only able to kick in at high revs. So basically, i-VTEC kicks in when ever it wants and VTEC needs to be at high revs.

No, i-VTEC means that the intake cam has VTC, or infinitely variable cam phasing throughout the RPM range, similar to Toyota's VVTi.

[vippy84]

supposively... i-VTEC should be better because i... "intelligent", it is all computerised and the VTEC is able to kick in when ever it wants depending on how much you step down on the pedal whereas the normal VTEC it has to build up the pressure inside and only able to kick in at high revs. So basically, i-VTEC kicks in when ever it wants and VTEC needs to be at high revs.

I-vtec is more efficient in terms of fuel consumption. But definitely Vtec is still much better and much more responsive.
S2000 is one of the best Honda cars. Why does it use the Vtec instead of i-vtec? this tells u the reason why... :P

[aaronng]

I-vtec is more efficient in terms of fuel consumption. But definitely Vtec is still much better and much more responsive.
S2000 is one of the best Honda cars. Why does it use the Vtec instead of i-vtec? this tells u the reason why... :P

Because the S2000 came out in August 1999 in Australia, while the first car with i-VTEC was the Stream which came out in October 2000.
Your info is wrong.

[BusterSonic12]

the mod whipping out.... pawned

[tron07]

I think usually before vtec kicks in there is a drop in the power, when vtec kick in you will feel the surge as if suddenly more power. However in newer ivtec engines, the power curves become much more linear, therefore you dont feel the strong kick.

[kenny]

vtec should feel more strong as it is a sudden kick of power that's been holding up, up until 6000 rpm.. while i-vtec on the other hand is more of a smooth kick because vtec kicks in depending on how much you push the throttle.. i've played around with a dc5, s2k, and euro, and can say for sure that vtec kicks harder in the normal vtec... however, does not mean that it will automatically produces more power than i-vtec.. so yeah, just my thoughts..

[aaronng]

There is less dip in torque before cam change point with i-VTEC because the ecu can alter cam phasing to help boost torque.

[h1coupe]

in the newer versions of honda the dohc i-vtec engines you get 2 types of vtec. there is the "power vtec" in the k24 engine in the euro for example, and the "economy vtec" found in the k20 engine in the euro also.
the k24 engine in the euro has got a very similiar vtec system to the older dohc vtec engines but with cool things like the vtc added and the k20 engines in the euro and other(crv, us accord and civic si) have similar systems to the vtec-e found in the 92-95 vei 1.5l and vtec-II found in the 96-00 lsi 1.5l sohc engines.
the newer engines have the vtc added so it´s more economical and more torquey through out the rev range.


the kick found in the older engines and is also present in the newer models is because of the vtec x-over is set to high for a reason, it´s so that people feel the "kick" it´s sort of a sales gimmick. a perfectly tuned vtec engines does not have a kick but a gradual climb in power to redline.

if your tuning vtec x-over you first try to set it way to low and then way to high and there should be set at where the lines cross. you can see if you set it to low that the power dips befor vtec switch over, and if you set it to high the power skyrockets just after vtec switch over but if you get it just right it´s just a gradual clean line from bottom to top