Sorry for the n00b question, but my friend is lookin into the RSX S and we are just trying to find out as much about it as possible. Also, how has the S responded to aftermarket modifications like intake, exhaust, etc. Finally, about how long is the breakin period for it when bought brand new? TIA

 

i-vtec = Inferior Vtec.

its basically an economic version of VTEC. do a search :fire:

 

**** searches im lazy anyone else with info other than a wiseass comment

 

BTW, search for i-VTEC, iVTEC, in recent and archive yielded no results.

 

i-vtec is on a constant retarding/advancing cam/ignition timing according to engine load. There is no actual 'engagement' in i-vtec, i guess you can say vtec is always on

and on the Type S motor it does this on both the intake and exhaust cam where as the 02 Civic Si and the base model RSX is only on the intake side.

Where as older VTEC such as h22a and ITR motor has a specific low cam profile for good idle and torque and mid performance, and then actually engages to a more higher profile cam lobe running at high rpm's generating more horsepower with more lift and more duration for more power

HTH

 

grassy ***

 

hey how is that better than my economic vtec statement

sure he has more details but we discuss the same thing! really!

 

Just to clarify, the VTC mechanism (the "i" in i-VTEC) is only operational on the intake camshaft on all i-VTEC motors.

VTC is marketed as a performance enhancement, and in truth it could be used that way, but the ECU tuning on the K-series motors uses VTC to recirculate exhaust gasses like an EGR valve. It's really more for emissions reduction than anything else. One drawback of continuously variable camshaft timing is that it makes it much more difficult to design aftermarket camshafts that will work accepably under the many conditions created by the engine's constantly changing needs. Any camshaft is a compromise, but VTC throws in so many tuning variables it may prove to be too damn difficult for aftermarket cam designers to come up with their own set of compromises. Toda Racing already has camshafts for the K20A, but they recommend their cam sproket for the intake cam, which completely disables VTC.

 

iVTEC is true three stage while the VTEC is only two stage. iVTEC on the D15B starts by only opening 1 instake and exhaust valve, followed by 16 valve operation and then the high lobe is operated.

 

Since when does Honda make a D15B with i-VTEC? I thought those were the old VX motors with VTEC-E?

***** I must be stupid.

 

haha, its funny to see how many versions of i-vtec.

 

iVTEC and VTEC-E use the same VTEC activation system so you get better MPG and performance. Look at the location under my name.

 

Actually there is a 3 stage VTEC that came only in the D15B in Europe and JDM Civic's. Produced 128 HP and has 54 MPG.

i-vtec is on constant variable timing according to engine load.
vtec-e has 1 lil camlobe&valve and 1 big cam lobe&valve (vtec) where the big valve barely opens and runs mainly on the lil cam lobe&lil valve and at high rpms opens up the bigger valve.

vtec-e is very good for turbo applications.

3 stage vtec (D15B) -- has low cam lobe, mid cam lobe, and high cam lobe.

What i wonder is why didn't Honda develop 3 stage VTEC for performance also into the ITR motor, and extract even more torque, and even more aggressive power band of cam lobes with lift/duration.

HTH

 

i think u are from japan, right? why dont u buy any book about civic(hyperrev, carboy, u name it) and read whats ivtec?

 

Why would I want to buy books about iVTEC when I don't have an iVTEC equipped motor?

Turbo B18C all day long!!

 

Since the Type-S responds well with mods........ injen sri/ and aem cai both dyno'ed in at 8hp/5tq. Also seen people with I/E dyno in at 13-14hp......

 

You guys got it all mixed up (except MK Ultra).

i-VTEC = VTEC + VTC on intake cam (like BMW VANOS or Toyota VVTi). That's it.

 

The I, stands for intelligent... that all I know.

 

i-VTEC Variable Valve Timing and Lift Electronic Control (VTEC) and camshaft Variable Timing Control (VTC), DOHC, four-valves-per-cylinder, chain-driven camshafts

 

 

All i heard was that it was used to make power delivered more smooth and linear..

Vee Tek y0!

 

What he said.

It still has the hi-cam operation, just that the intake cam has the ability to "tune" itself throughout the rpm range.

 

poor man's VANOS?!
j/k

 

What the **** is Vtec?

 

I bet the RICE BOYS on VTECtech can answer this question with NOOOOOO problem. bwahahahahaha!!