VTEC Question

**khaled_y** · May 8th, 2010 10:29 PM

I own a 2004 Honda City VTEC - stock engine. Everytime I hit 80 Kph may naririnig ako na humming sound na nangagaling sa likod (i think from the exhaust yung sound). Yung tunog nya ay parang may 400 cc na bike na malapit syo. I asked a friend who owns a 2003 Honday Civic and he said na it's because of the VTEC engine and its normal.

Ask ko lang para sa mga VTEC car owners kung normal po ito. Thanks!

**[archie]** · May 8th, 2010 10:31 PM

yep normal po yan... yung sound na parang tumatapang yung engine? hehe

**khaled_y** · May 9th, 2010 10:03 AM

Yes sir. Parang nagagalet nga cya. Lagi po ganun pag nasa 80 kph na ako.

**kulotz** · May 9th, 2010 10:27 AM

AFAIK me certain rpm range kasi ang vtec na ginagawa niyang mas agresibo ang cam profile kaya gumaganun ang tunog.. ayos lang yan astig nga ganun eh..

**khaled_y** · May 9th, 2010 01:02 PM

Naliwanagan na po ako. Thanks mga Sir!

**isa1023** · May 11th, 2010 08:08 AM

Originally Posted by khaled_y

Yes sir. Parang nagagalet nga cya. Lagi po ganun pag nasa 80 kph na ako.

Masyadong maaga ang 80 kph para bumukas ang VTEC ng 1500 sohc honda kung nasa top gear (final gear) ka, unless nalang meron kang VTEC controller which is unlikely in your case.

Pero gaya nga ng sabi nila, yung humming sound na biglang papalo tapos makakaramdam ka ng biglang lakas ng hatak ay senyales na engaging na yung VTEC.

VTEC ba yan o i-VTEC na? AFAIK, VTEC-E ang nakalagay sa 1500 sohc ng City 2004 (pls correct me if I'm mistaken) so dapat wala kang maririnig na hissing sound dahil sarado na ang VTEC-E sa ganung speed ...

**civic minded** · May 18th, 2010 08:39 PM

hindi yata vtec yang naririnig mo...baka wheel bearing yan...vtec activates at 5600rpm(depende sa tune)...besides hindi sa likod ang tunog nung vtec it should come from the engine bay...kung sohc yan di masyado prominent yung tunog nyan(pwera lang kung d15b)kasi vtec is only on the exhaust side..at 80kph hindi pa bumubukas yung vtec pwera lang kung nasa 2nd gear accelleration ka...hope it helps.

**isa1023** · May 21st, 2010 11:00 AM

Originally Posted by civic minded

hindi yata vtec yang naririnig mo...baka wheel bearing yan...vtec activates at 5600rpm(depende sa tune)...besides hindi sa likod ang tunog nung vtec it should come from the engine bay...kung sohc yan di masyado prominent yung tunog nyan(pwera lang kung d15b)kasi vtec is only on the exhaust side..at 80kph hindi pa bumubukas yung vtec pwera lang kung nasa 2nd gear accelleration ka...hope it helps.

JDM D15B VTEC 20 camlobe owner here:
http://www.lepak.tv/index.php?page=v...&vid_id=101285

AFAIK sir and according din sa video, sa intake valves po pumapalo yung addtional 4 camlobes once VTEC activates.

Agree po ako sa engine bay dapat manggagaling yung sound once the VTEC activates.

Hindi lang ako sure sir pero diba yung VTEC ng City 2004 is VTEC-E, or 3-stage na?