vtec engage
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Member
Joined: Aug 2005
Posts: 103
From: JAPAN
vtec engage
hi guys, just want to ask...in what rpm does the vtec engage in 1.5engine? because i hardly find to difficult to distinguish it...unlike in the B series engine its really obvious when the vtec kicks!!! 
thanx
thanx
Member
Joined: Apr 2006
Posts: 1,202
From: New YOrk
I Generally notice a power increase from 3800 RPMs to 5500 anything after that seems useless. (On stock engines) If you add performance modifications then you can get more out of the top end or mid to low end too!
I've read that it kicks in at 3400 rpms at normal throttle, and 2300 rpms at Full depression on the Throttle.
So i guess that is the official numbers above.
I've read that it kicks in at 3400 rpms at normal throttle, and 2300 rpms at Full depression on the Throttle.
So i guess that is the official numbers above.
Member
Joined: Apr 2006
Posts: 1,202
From: New YOrk
we might have different ECU's and fuel mapping....
Not sure though. I definetely do not feel anything at 2800.... BUt then again at full throttle i don't feel anything at 2300 as i read,......
I only always feel something at 3800- 4000
How does yours feel, does it correspond with the Vtec light?
If so then we difinately have a difference between Asian market vehicles and North American Vehicles!
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Not sure though. I definetely do not feel anything at 2800.... BUt then again at full throttle i don't feel anything at 2300 as i read,......
I only always feel something at 3800- 4000
How does yours feel, does it correspond with the Vtec light?
If so then we difinately have a difference between Asian market vehicles and North American Vehicles!
Write back
Member
Joined: Sep 2005
Posts: 718
From: Plainwell Michigan
Again...
Per Temple of VTEC (who I trust to know more about NA Fit specs than someone outside NA)
:
http://www.vtec.net/articles/view-ar...&page_number=3
"At around 3400 rpms (depending upon conditions), the VTEC spool valve engages a locking pin, which couples the second intake rocker arm to the primary follower, bringing the secondary intake valve into action, which allows the combustion chamber to gulp more mixture."
:http://www.vtec.net/articles/view-ar...&page_number=3
"At around 3400 rpms (depending upon conditions), the VTEC spool valve engages a locking pin, which couples the second intake rocker arm to the primary follower, bringing the secondary intake valve into action, which allows the combustion chamber to gulp more mixture."
Avid FitFreak Poster
Joined: Jan 2006
Posts: 1,491
From: Middletown/Front Royal, Virginia, USA
From what I know is that the VTEC engagemen point is 5,400-5,600 rpm. The major power gain that is felt when the egine changes from the 12 valve - 16 valve around 3,600 rpm...
Originally Posted by dougiepants
From what I know is that the VTEC engagemen point is 5,400-5,600 rpm. The major power gain that is felt when the egine changes from the 12 valve - 16 valve around 3,600 rpm...
Someone that Posts too much
Joined: Apr 2006
Posts: 711
From: Toronto, Ontario, Canada
Originally Posted by claymore
What somebody needs to do on their USDM Fit is hook up a light. If someone has a testlight it would only take 5 minutes to check it out. Pop your hood insert the testlight into the light green with yellow stripe wire connector coming out of the Vtec solenoid then put the clip onto your battery ground post. It won't light without vehicle movement so let the car roll in your driveway or drive a even a slight rolling speed of a couple mph any speed above a dead stop and rev the engine slowly until the light comes on that is your Vtec engagement point. Doesn't anyone read the posts before posting?All these myths continue because of all you guys speculating on something I have ALLREADY supplied the answer to SEVERAL TIMES. Look it up in the manual or hook up a light then report your facts not this "I heard it's ...???". I love the ones sayng it's 5000 rpm you guys are talking about OTHER HONDAS not the Jazz/Fit.
don't let the n00bs get to you.. we will find out soon enough, i will do this test for you when i get back home next week
-joe
New Member
Joined: May 2006
Posts: 27
From: East Falmouth, MA
Originally Posted by dougiepants
No that is not VTEC Crossover...
Basically, up until about 3400rpm, the motor is only running on one intake valve. At 3400rpm, the Vtec solenoid engages, and activates the second intake valve. The reasons for this are well-explained: the single-valve operation promotes a swirling in the combustion chamber, creating better fuel effeciency, thanks to the small intake valve size, and offset placement. When the second valve is activated, the motor produces more power, as you have just doubled the intake valve total area...
Unluckily, TOV appears to be down for the time being. As soon as its back up, please read about the motor in your car, and take some time to review the facts. Its a shame that so much misinformation is being spread about a car that only just arrived here in the states. In other countries, the VTEC engagement points may be different, but for the US, thats the deal.
Did you also know that the rods in the L15A motor do NOT line up with the crank? This fact, coupled with the under-square design of the motor is what limits the L15a to only 6500rpm.
:EDIT:
I used Google's cache of the L15a info page:
This is G o o g l e's cache of http://asia.vtec.net/Series/FitJazz/lseries/ as retrieved on Apr 30, 2006 19:34:42 GMT.
G o o g l e's cache is the snapshot that we took of the page as we crawled the web.
The page may have changed since that time. Click here for the current page without highlighting.
This cached page may reference images which are no longer available. Click here for the cached text only.
To link to or bookmark this page, use the following url: http://www.google.com/search?q=cache...ient=firefox-a
*mod edit* - I took out the 8 billion pages of copywrited text but left the links for people to click if they want to read the article.
Last edited by fshwcrs; May 14, 2006 at 10:14 PM.
New Member
Joined: May 2006
Posts: 27
From: East Falmouth, MA
Originally Posted by dougiepants
Thanks for the correction...
Someone that Posts too much
Joined: Apr 2006
Posts: 511
From: Philippines
I felt it KICKed-in as i floored it merging to a faster lane. My attention was with my surroundings so i only had a glimpse and the tach was just pass the 3,000 mark before i felt the rush.
June 2007 1st Place Fit of the Month Winner
Joined: Apr 2006
Posts: 1,664
From: The Latin Pot
Originally Posted by sharkytm
No problem. If you have any other technical questions regarding the motor, fire away. I've spent quite a bit of time researching the L-series motor, potential swaps (which are not a good idea, imho), and issues I'm sure we'll encounter as we push the L15 to its limit.
New Member
Joined: May 2006
Posts: 27
From: East Falmouth, MA
Originally Posted by Paulo107
motor swaps not a good idea...stay with the L15
If you want a faster car, get a Civic, the K-series fits better, and thanks to the gastank not being under the front seats, the weight distribution isn't so bad. The Fit really excels with the L15a, as seen in the Spoon Fit. They tweaked it to make ~125bhp, saying that more made the car unpredictable, unreliable, and difficult to drive. I see no reason to argue with them by wasting money installing another motor.
Originally Posted by GoFit
I felt it KICKed-in as i floored it merging to a faster lane. My attention was with my surroundings so i only had a glimpse and the tach was just pass the 3,000 mark before i felt the rush.
Anyhow, I'm sure I'll be in the minority here, everyone is foaming at the mouth over the unfinished K-swaps in CA, and lining up to pay through the nose for Hasport mounts or a kit, plus an overpriced motor. If you all have any questions, feel free to IM me or email me. sharkytm@gmail.com
Member
Joined: Apr 2006
Posts: 239
From: 951
I was thinking of picking up a K03 Sport from one of the 1.8t guys thats gone the BT route, and getting a mani and DP fabbed up, but DBW is kind of a problem for real engine management last I checked. It'd be so cheap, too 