what up, wondering of also buying a si but i heard that even with a cold air and a cat back there vtec is very bad, like yiou cant feel it or hear it , is this true? people with si's tell me how your vtec is compared to a b16 or somthing thanks.

 

well tonite i just raced my stock si against my friend's 99-00 si (i/h/e/camgears) only beat me by a car...

i hear that when you add i/h/e to the ep3, the "vtec" has a nice sound to it. i don't think these addons will slow you down though

 

http://www.hondata.com/techk20general.html

yep, ep3 vtec is weak

 

ep3 vtec isn't "weak" - it's just not the "I'm in Vtack! y0!" that everyone is used to.
Who cares whether you "feel" the vtec in upper rpms - as long as you're making power throughout the powerband, I could care less.

It's like saying the STi sucks because you can't feel the "turbo lag baby!" that you can in a WRX.

If you want to say that the ep3 engine is "weak" compared to the RSX-S engine, that's a different argument.

 

^^ isn't that what he was comparing? ... "vtec being weak compared to a b16 or something?"

 

i dont think the k20a3 even has the higher cam profile change

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fireDC5 &raquo;</TD></TR><TR><TD CLASS="quote">i dont think the k20a3 even has the higher cam profile change</TD></TR></TABLE>
yes, it does not. But it does have more power than a B16, even though it does not have the profile change (greater torque).

 

The vtec on a k20a3 kicks in at around 2200 rpm or so, which is alright I guess. However nothing beats that kick in the pants of "normal" vtec.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kal &raquo;</TD></TR><TR><TD CLASS="quote">
yes, it does not. But it does have more power than a B16, even though it does not have the profile change (greater torque).</TD></TR></TABLE>

it has more torque than a b16a2 ... not more power. ep3 has the same power as em1, but also about 150 pounds heavier.

 

regardless of what type of vtec it is, the best transition into vtec is the most linear.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aznboysrfr &raquo;</TD></TR><TR><TD CLASS="quote">

it has more torque than a b16a2 ... not more power.</TD></TR></TABLE>

torque= power. hp is only an eqaution of torque. basically hp= how much work an engine is capable of, not how powerful it is.

one question, which is heavier b16a2 or k20a3?

 

k20a3 is heavier...I'm happy with the power of my ep3...thats why I'm saving up for a k20a swap.

peace
jon

 

Someday, someday there will be a sticky thread in here that says "Whas up with my ep3/rsx-base vtec yo?" and it will contain this priceless info:

http://www.superhonda.com/foru...05867

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hatch2k &raquo;</TD></TR><TR><TD CLASS="quote">Someday, someday there will be a sticky thread in here that says "Whas up with my ep3/rsx-base vtec yo?" and it will contain this priceless info:

http://www.superhonda.com/foru...05867</TD></TR></TABLE>

Great information in that link.

 

VTEC DOES NOT MAKE YOUR CAR FASTER!!! HELL NO

 

one thing i saw wrong in the link above. VTC is on all k-series motors, not only those with 6 lobes/cylinder. i'm curious if further gains could be had from modifying ,or aftermarket VTC cam gears. no need for adjusting degrees it should do it for you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stealthhatch &raquo;</TD></TR><TR><TD CLASS="quote">one thing i saw wrong in the link above. VTC is on all k-series motors, not only those with 6 lobes/cylinder. </TD></TR></TABLE>

I've read it again and again, but I can't find what you are talking about.

 

Anyone have an overlay of an 02+ Si's dyno with the 99-00 Si's dyno? I think that will go a long way to demonstrating the diffences of two engines with the same *peak* hp but with radically different powerbands.

 

That's a good point. The new Si addresses issues that people had with the 00 Si:

1) what happened to the hatchback?
2) why isnt it tighter and more comfortable?
3) where is the low-end torque?

At the same time, Honda also had to build a car that

1) was based on the already successful Type R hatch
2) had some appeal to both younger and older people
3) wouldnt harm Acura RSX sales

I think they did pretty good...er except the front struts

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hatch2k &raquo;</TD></TR><TR><TD CLASS="quote">

I've read it again and again, but I can't find what you are talking about. </TD></TR></TABLE>

heres what i copied and pasted from the thread.

Now here we see the VTC mechanism - the gear on the end of the intake cam that adjusts valve timing (overlap) automatically on the fly.

This system is used in engines powering the JDM Honda Integra Type-R, Civic Type-R, Accord Euro-R, and the USDM Acura RSX Type-S and TSX.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stealthhatch &raquo;</TD></TR><TR><TD CLASS="quote">This system is used in engines powering the JDM Honda Integra Type-R, Civic Type-R, Accord Euro-R, and the USDM Acura RSX Type-S and TSX.</TD></TR></TABLE>

That referrs to the entire section about the first type of i-VTEC above it, not just the last part on VTC.


The section after that is about the second type of i-VTEC, and it also mentions VTC, then closes with

"This system is used in engines powering the USDM Acura RSX base, Honda Civic Si, Accord 4-cylinder, CRV, and Element."


Targa250R took on a difficult task putting all that together in an understandable way, but its the best one I've seen so far.

 

gotta look at that again, i guess i misread it

 

You hear the VTEC really well in the EP3, and you only need one mod to hear it really well. K20a2. lol


You can't really hear the A3 VTEC kick especially in stock form. I have I/E , and if you listen real close you can hear it.

The kick you feel at around 2200 is the cam advancing. There is a small change in the cam profile at the normal vtec spot, but it isn't harsh because there isn't a change on both cams, just the intake.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SloazzEKhatch &raquo;</TD></TR><TR><TD CLASS="quote"> There is a small change in the cam profile at the normal vtec spot, but it isn't harsh because there isn't a change on both cams, just the intake.</TD></TR></TABLE>


Exactly... K20A3's i-VTEC is non-audible because there is only a profile change on the intake cam... The exhaust cam doesn't not have any VTEC lobes... Essentially the K20A3 is a glorified single cam...

 

ep3 vtec sucks compare to my b16a2 vtec you cant really feel it or hear it engage. ive heard that you aren't suppose to be able to hear it because its always on? i don't know about it. i got a 97 with a b16 in it and waxed the **** out of my buddies 03 si with i/e/h. and my b16 is stock i think the lsd helped a little though. bud to answer the origanal QU i think that ep3 vtec is weak.