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How does VTEC work?

 
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Old 06-03-2008, 04:41 AM
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How does VTEC work?

Guys... its always tough explaining how VTEC works.. you feel like you know it in your head but when you say it the person in front of you always has that blank stare..

So here's the best explaination in video form!

http://www.preludezone.com/prelude-stuff/VTEC.wmv

(Right click, save as)
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Old 06-03-2008, 02:48 PM
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I love that vid soooo much lol.
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Old 06-06-2008, 02:24 PM
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short and simple
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Old 07-10-2008, 09:00 PM
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"vtec-variable valve timing and lift control...3 lobes for each pair of valves...the 2 outer cam lobes uses low speed torque and response...the middle lobe has a high lift and a longer duration that optimizes higher end HP...at lower rpm the the middle rocker is idle..and when the ecu reads the right conditions in rpm, speed and coolant temp...it hits into vtec...oil fills fills the holes and pushes the pistons and the rockers on each intake and exhaust valve lock together by a pin that moves across the middle rocker forces the two outer to follow a higher lift and longer duration profile of the middle cam lobe..allowing the engine to draw and expel more air and produce more power...and the ecu adjusts cam timing...." para phrased from super street mag
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Old 07-10-2008, 09:15 PM
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Quote:
Originally Posted by cleanbb6 View Post
vtec-variable valve timing and electric lift control
fixed it for you
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Old 07-11-2008, 07:07 PM
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thanx lol see thats why i like you guys n this forum
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Old 07-20-2008, 11:57 PM
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I always just view it and say it as "All pistons moving as one instead of alternating" if people don't understand, i don't bother going into it further because chances are, if they don't understand that simple phrase, they won't understand if I go more into depth about everything else
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Old 09-05-2008, 01:26 PM
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Re: How does VTEC work?

wait,what,all the pistons are still alternating aren't they?piston 1 and for piston 4 move at the same time and piston 2 and piston 3 move with each other.I'm confused
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Old 11-06-2009, 09:31 AM
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Re: How does VTEC work?

hi guys.

so the video said that the vtec happening at >4.5krpm
does this apply to all lude??

coz my friend said the vtec kicks around red bar of the rpm meter.
:D

cheers guys
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Old 11-06-2009, 10:16 AM
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Re: How does VTEC work?

Quote:
Originally Posted by Fantagero View Post
hi guys.

so the video said that the vtec happening at >4.5krpm
does this apply to all lude??

coz my friend said the vtec kicks around red bar of the rpm meter.
:D

cheers guys
I hate to say it but your buddies car is probably messed up, whether it be low oil, bad sending unit or a messed up vtec solenoid. Vtec in my prelude kicked in right after 5000 RPM, it should not be kicking in so close to redline, when mine kicked in late it meant I had low oil. You can also get vtec controllers and manually set when you want your vtec to kick in

hope this helps a little!
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Old 11-06-2009, 10:23 AM
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Re: How does VTEC work?

Quote:
Originally Posted by OEM~KaOs View Post
I hate to say it but your buddies car is probably messed up, whether it be low oil, bad sending unit or a messed up vtec solenoid. Vtec in my prelude kicked in right after 5000 RPM, it should not be kicking in so close to redline, when mine kicked in late it meant I had low oil. You can also get vtec controllers and manually set when you want your vtec to kick in

hope this helps a little!
he's not on lude..

i just overheard when we gather and they discussing about car with the other guy before i bought my lude. i just was just listening as i dont know much bout car..

so basically vtec on my lude (4th gen) will start working when the rpm reach 4.5rpm?? even on stock?

since speed limit is 60kmh here. so once in a while i'd love to feel the rush from 0-60kmh as fast as i can.. lol.
u wont be pulled over for accelerating :P
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Old 12-14-2009, 04:27 PM
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Re: How does VTEC work?

I have NEVER got an answer for this on any other thread, nor have I been able to find it in the manual. Is there a 'manifold' sensor that sends a signal to the ECU. Something that can be tapped into that would provide a neg (-) signal?

The video is calling it the "command module."
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Old 01-27-2010, 03:24 PM
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Re: How does VTEC work?

Ok so On topic question here.. would an intermittent fault in the external coil cause vtec not to engage in a 93 lude with a h22a?
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Old 01-31-2010, 04:11 AM
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Re: How does VTEC work?

good,easier too understand
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Old 02-12-2010, 01:03 AM
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Re: How does VTEC work?

hi all!! is that true that before vtec open..under 5000rpm..vtec engine will running 8 valve only..and will running 16 valve after vtec is open?? is that true??
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Old 02-17-2010, 01:50 AM
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Re: How does VTEC work?

Engine Adrenaline
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Old 02-23-2010, 04:06 AM
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Re: How does VTEC work?

Your engine fills with oil and gets a boner thus increased performance :)

Quote:
Originally Posted by jebat View Post
hi all!! is that true that before vtec open..under 5000rpm..vtec engine will running 8 valve only..and will running 16 valve after vtec is open?? is that true??
Only on some engines, only SOHC vtec engines have this if I'm correct.
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Old 04-12-2010, 05:17 PM
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Re: How does VTEC work?

great video
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Old 04-16-2010, 03:11 PM
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Re: How does VTEC work?

Ok, so is vtech better then non vtech? cause I read somewhere that my non vtech si abetter then the vtech si...
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Old 05-18-2010, 07:52 PM
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Re: How does VTEC work?

vtec is the sh**
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Old 05-20-2010, 07:58 PM
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Re: How does VTEC work?

good post thanks
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Old 08-06-2010, 01:41 PM
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Re: How does VTEC work?

Looks good to me
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Old 04-02-2011, 11:28 AM
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Re: How does VTEC work?

As far as I can tell if you have a problem with your vtec kicking in, you should take a few steps, but it always helps knowing about your car before troubleshooting. Such as whether it was a non-vtec and someone swapped an engine on it previously.
If that was the case I'd look at my ECU to see whether it can operate vtec, such as a p13 or p14. OR a chipped p28 or p72 (in which case Id go get it retuned myself to ensure it was done properly with the vtec setup)
If youre car's ECU is good, and you know the car is set up properly, then I would move on to oil level and pressure.
If that checks out, move on to the vtec solenoid.
Heres my step by step, comprehensive guide for troubleshooting your cars problems:
GET A HELMS MANUAL - YOU CAN FIND THEM ONLINE TO DOWNLOAD FOR FREE

I can't remember where I downloaded mine though, but if you search google for "download prelude helms" I', sure youll find one on the prelude sites, either here or preludeonline.
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Old 05-20-2011, 08:38 PM
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Re: How does VTEC work?

it's v-tec yo, doesn't need an explanation.
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Old 05-23-2011, 11:01 PM
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Re: How does VTEC work?

Quote:
Originally Posted by lOOcHy View Post
short and simple
but its useful ...do you think so ?

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Old 05-30-2011, 12:51 AM
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Re: How does VTEC work?

intese vtec power! lol we all need some vtec in our lives lol
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Old 07-24-2011, 11:25 AM
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Re: How does VTEC work?

vtec O_O
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Old 03-04-2012, 06:08 PM
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Re: How does VTEC work?

At what RPM does the VTEC kick in? Ive noticed a big boost at about 5500 RPM.. Unless my check engine light is on. This shuts off by a flip of the key. I have a 93 prelude with a VTEC swap. I havnt really looked for the cpu yet to see if it has a diagnostic plug (hope so) any info would be great. How can you tell if its a japanese sold engine?
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Old 03-05-2012, 02:11 AM
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Re: How does VTEC work?

Quote:
Originally Posted by bucsfan27 View Post
At what RPM does the VTEC kick in? Ive noticed a big boost at about 5500 RPM.. Unless my check engine light is on. This shuts off by a flip of the key. I have a 93 prelude with a VTEC swap. I havnt really looked for the cpu yet to see if it has a diagnostic plug (hope so) any info would be great. How can you tell if its a japanese sold engine?
Usually 5.2K RPM is where it's at from factory. If you feel a boost at 5.5K RPM then thats your VTEC crossover. So when the CEL comes on, it sometime will disable VTEC. So pull the code and figure whats wrong.
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Old 03-13-2012, 01:01 PM
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Re: How does VTEC work?

ok my question is what would make v-tec work sometimes then other times not? had a cel but it worked with it on oil is fine and pressure is fine... would that mean it would probably just be the solenoid going out? btw 98 lude with factory motor.
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