turbo and vtec
Registered!!
Joined: Jan 2004
Posts: 28
Likes: 0
Rep Power: 0 
Responding to this kinda late but here goes:
VTEC will not automatically be turned off by installing a turbo system. VTEC would have to be intentionally disabled. There is a reason why he believes it is turned of which is really not because he is full of BS but more of lack of knowledge in this subject.
VTEC or any variable valve timing (VVTL-i in the Celica motor) is awesome for N/A motors. You know that it is working when you fell the pull or hear it thru your cold-air-intake. With a cold-air-intake you can really hear it because the air box is no longer there to soak up the extra resonance created by the valve overlap. You still hear it if you have a stock air box but it is a huge difference in sound level when you install a new intake.
After you install a turbo it makes it seem like VTEC/VVTL-i is disabled because of two things:
1. The intake track is much longer due to all intercooler piping and the fact that air has to pass through the turbo. Both of these things absorb a lot of the sound that is created by the valve over lap I mentioned before. Without the sound, people might think VTEC is disabled.
2. The pull the you feel when VTEC/VVTL-i kicks in is not that noticable in a turbo charged motor. It will still show as a gain in a dyno graph, but you don't feel it as much in the butt dyno because the motor is already having air rammed into it.
VVTL-i is not as noticeable in my Celica GT-S (2ZZ-GE) after the SF turbo because of these two reasons. Key word there is "noticeable". It is still there cause I can slightly hear it and the dyno shows a gain.
Richard del Rosario
VTEC will not automatically be turned off by installing a turbo system. VTEC would have to be intentionally disabled. There is a reason why he believes it is turned of which is really not because he is full of BS but more of lack of knowledge in this subject.
VTEC or any variable valve timing (VVTL-i in the Celica motor) is awesome for N/A motors. You know that it is working when you fell the pull or hear it thru your cold-air-intake. With a cold-air-intake you can really hear it because the air box is no longer there to soak up the extra resonance created by the valve overlap. You still hear it if you have a stock air box but it is a huge difference in sound level when you install a new intake.
After you install a turbo it makes it seem like VTEC/VVTL-i is disabled because of two things:
1. The intake track is much longer due to all intercooler piping and the fact that air has to pass through the turbo. Both of these things absorb a lot of the sound that is created by the valve over lap I mentioned before. Without the sound, people might think VTEC is disabled.
2. The pull the you feel when VTEC/VVTL-i kicks in is not that noticable in a turbo charged motor. It will still show as a gain in a dyno graph, but you don't feel it as much in the butt dyno because the motor is already having air rammed into it.
VVTL-i is not as noticeable in my Celica GT-S (2ZZ-GE) after the SF turbo because of these two reasons. Key word there is "noticeable". It is still there cause I can slightly hear it and the dyno shows a gain.
Richard del Rosario
Joined: Jul 2003
Posts: 30,677
Likes: 1
From: Dallas, PA
Rep Power: 607 
i'm not even bothering arguing with anybody anymore. I've done my research and if i dont' know sumtin, then i will research it. I wish everyone would do the same 
lease:
lease: 
Joined: Jul 2003
Posts: 30,677
Likes: 1
From: Dallas, PA
Rep Power: 607 Originally posted by throwback201
disabiling vtec is only good for extreme drag racers who dont drive their car on the street. while u are drag racing you stay in the upper rpm range so the vtec is not really in use. its just extra weight in the valve train that is sapping power.
disabiling vtec is only good for extreme drag racers who dont drive their car on the street. while u are drag racing you stay in the upper rpm range so the vtec is not really in use. its just extra weight in the valve train that is sapping power.
Turbo Member
iTrader: (3)
Joined: Mar 2001
Posts: 2,490
Likes: 0
From: Salisbury, Maryland, US
Rep Power: 330 Originally posted by throwback201
disabiling vtec is only good for extreme drag racers who dont drive their car on the street. while u are drag racing you stay in the upper rpm range so the vtec is not really in use. its just extra weight in the valve train that is sapping power.
disabiling vtec is only good for extreme drag racers who dont drive their car on the street. while u are drag racing you stay in the upper rpm range so the vtec is not really in use. its just extra weight in the valve train that is sapping power.
Joined: Sep 2001
Posts: 26,407
Likes: 0
From: Lexington, KY
Rep Power: 584 that may very well be so, but i think some of us were commenting that the disengagement and weight have nothing in common, even though it may be disabled the wieght is still there til get a new cam right
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
Elciteeve
Mechanical Problems/Vehicle Issues and Fix-it Forum
3
Sep 28, 2015 12:40 PM
beanhead
Archive - Vehicles for Sale/Wanted
1
Sep 24, 2015 12:04 PM
chiquita.banana
6th Generation Civic 1996 - 2000
5
Sep 24, 2015 09:42 AM
