Last post on Jan 05, 2012 at 5:15 PM
You are in the Honda Civic
What is this discussion about?
Honda Civic, Acura, Coupe, Sedan
Apr 16, 2007 (7:19 am)
as far as the interior specs go...the csx should be identical to the si sedan. If you have the coupe, of course the backseat is more usable! Its a four door and has about 3 1/2 more inches of leg room!
Good article, but it makes me wonder about one thing...
..is ther ANY civic si owners who understand anything about i-vtec? Apparently not.
There is NO cam switchover. You should not be able to hear it. What you intake is amplifing is the engine noise in general, not the ability to here the v-tec valves! This is a characterstic inherent of older b series engines, and even then, its a change that you FEEL and not neccesarily HEAR.
There is a more aggresive cam, but it doesn't 'kick in' at 5800 rpms, thats the point of i-vtec, kicking in when you do.
#3 of 7 Re: Well... [eldaino]
Apr 16, 2007 (7:27 am)
Have you read tech specs on how i-VTEC works? It seems peculiar to me that you are one against many that preach an alternate operation for the engines.
Apr 16, 2007 (12:36 pm)
i have. Many a time. In fact, you can view them on wikipedia or go to temple of vtec.com and find out there. Many who 'preach' this are realatively new forum memembers or ones who join and only stay a little while.
#5 of 7 Re: yes [eldaino]
Apr 16, 2007 (1:17 pm)
Taking a page straight out of ToV:
"Below 2500rpm and with gentle accelerator pressure, neither pin gets actuated. The engine operates in 12V mode with very good fuel combustion efficiency. When the right foot gets more urgent and/or above 2500rpm, the upper pin gets actuated. This is the VTEC-E mechanism at work and the engine effectively enters into the '2nd stage'. Now D15B 3-stage works in 16V mode (both intake valves works from the same mild cam-lobe).
Stage 2 operates from around 2500rpm to 6000rpm. When the rpm exceeds 6000rpm, the VTEC mechanism activates the wild cam-lobe pushing the engine into the '3rd stage', the power stage. Now the engine gives us the full benefit of its 130ps potential !"
I'd bring up things like the Reynold's number and turbulence effects, but that wouldn't serve to do much here.
#6 of 7 Re: yes [vviley]
Apr 18, 2007 (4:38 am)
i know how the i-vtec works on the newer k series engines; in fact this entire post suppports what i've always said; the upper pin goes into over time in as little as 2500 rpm, even if a MORE aggressive lobe is used after 6000 rpms, that still makes it a different beast than the old b series engines that did this strictly after 5000 rpms or so, regardless if you are flooring it or not.
And if i recall, you stated a noticable 'cam changeover' at 5800 rpms? Your own temple of vtec pulled info goes against that as well.
Header and an intake make a car louder, but probably only add about 12-18 hp and that is just engine producing, not hp thats getting to the wheels; you probably added about 6 or 7. Dyno your car, you'd be suprised.
#7 of 7 Re: yes [eldaino]
Jan 05, 2012 (5:15 pm)
I have a 08 Mugen civic Si sedan and all I have done is AEM full cold air intake and all the Mugen features that came with the car (suspension, lip kit, rims 18'' , Mugen shift knob, Mugen shirt throw shifter and an authentic Mugen center counsel with Mugen badge, Mugen cat-back exhaust.) and idk what to do with it, whether to super charge it or turbo it, my last car i had an LS V-tec turbo integra fully built 308whp and idk what to do any ideas???