Where does VTEC kick in?
#1
Where does VTEC kick in?
I use to have a 98 Prelude and the notice when the VTEC really hit was at about 5K. Where is it in the new TL. I feel like there is not a big huge burst of power yet all around. I may have been able to tell a difference around 4500
#3
It is more gradual in the Accords and TL's mostly due to the fact that there is already quite a bit of power available.
Even in the almighty NSX, it is more subtle than say in a Prelude, Civic Si or Integra GS-R/Type R
Even in the almighty NSX, it is more subtle than say in a Prelude, Civic Si or Integra GS-R/Type R
#4
I can feel it more in the TL than in my NSX.... actually.. if you look at a dyno graph for an NSX you'd see a remarkaby flat torque curve.. there are no jumps in torque (which is what would make you 'feel' the vtec).. The nice thing about the TL and the NSX - though - is that you have both nice torque at 2500-3000 and it holds all the way to redline (more or less)...
IMHO - i'd rather have more torque in the 3k-6k range than in the 5k-8k range as it is more 'usable' on the street.. and i think it has more of a seat of the pants feel... just an opinion tho.
Interesting note.. i wonder if i could buy an extra set of TL Calipers on put them on NSX front brakes? hmmmmm... anyone thought of this?
IMHO - i'd rather have more torque in the 3k-6k range than in the 5k-8k range as it is more 'usable' on the street.. and i think it has more of a seat of the pants feel... just an opinion tho.
Interesting note.. i wonder if i could buy an extra set of TL Calipers on put them on NSX front brakes? hmmmmm... anyone thought of this?
#5
The VTEC on the TL kicks in at a certain rpm as opposed to some of the hotter Hondas and Acuras where the VTEC is modulated over a full range of rpms depending on what the computer says. This info from another web site.
#6
Acura said...
VTEC(TM) (VARIABLE TIMING & LIFT ELECTRONIC CONTROL)
Acura VTEC(TM) (Variable Timing and Lift Electronic Control) gives the TL engine strong low speed torque and response coupled with class-leading high rpm horsepower. The TL VTEC system has two distinct modes of operation for the engine's 12 intake valves. At low speeds, the intake valves have low lift and are open a comparatively short period of time during cylinder filling. At high rpm where breathing is critical, the valves switch to high-lift, long duration mode to deliver the best volumetric efficiency possible. The VTEC changeover point occurs at 4700 rpm, and takes just 0.1 second; it's undetectable to the driver.
In the new TL, the VTEC system continues to be the 3-rocker type, which allows each of a given cylinder's intake valves to be controlled by its own low-speed cam lobe. (By comparison, with 2-rocker VTEC, both intake valves in a given cylinder are controlled by a single low-speed cam lobe). With different low-speed cam profiles for each intake valve, 3-rocker VTEC allows for staggered valve opening and lift. This promotes swirl in the combustion chambers, which improves efficiency. With better mixing in the cylinders, burn speed and combustion stability are improved. When engine rpm reaches 4700 rpm, the powertrain control module (PCM) triggers the opening of an electric spool valve that routes pressurized oil to small pistons in the intake valve rocker arms. These pistons slide into position to lock together the three intake rockers in a given cylinder, which then follow a single high-lift, long-duration cam lobe. With the engine's intake valve lift and opening duration continuously adjusted to suit the operating engine speed, the TL benefits with a broad torque curve and superior peak power.
Acura VTEC(TM) (Variable Timing and Lift Electronic Control) gives the TL engine strong low speed torque and response coupled with class-leading high rpm horsepower. The TL VTEC system has two distinct modes of operation for the engine's 12 intake valves. At low speeds, the intake valves have low lift and are open a comparatively short period of time during cylinder filling. At high rpm where breathing is critical, the valves switch to high-lift, long duration mode to deliver the best volumetric efficiency possible. The VTEC changeover point occurs at 4700 rpm, and takes just 0.1 second; it's undetectable to the driver.
In the new TL, the VTEC system continues to be the 3-rocker type, which allows each of a given cylinder's intake valves to be controlled by its own low-speed cam lobe. (By comparison, with 2-rocker VTEC, both intake valves in a given cylinder are controlled by a single low-speed cam lobe). With different low-speed cam profiles for each intake valve, 3-rocker VTEC allows for staggered valve opening and lift. This promotes swirl in the combustion chambers, which improves efficiency. With better mixing in the cylinders, burn speed and combustion stability are improved. When engine rpm reaches 4700 rpm, the powertrain control module (PCM) triggers the opening of an electric spool valve that routes pressurized oil to small pistons in the intake valve rocker arms. These pistons slide into position to lock together the three intake rockers in a given cylinder, which then follow a single high-lift, long-duration cam lobe. With the engine's intake valve lift and opening duration continuously adjusted to suit the operating engine speed, the TL benefits with a broad torque curve and superior peak power.
Trending Topics
#8
I currently own both the TL and Prelude and have driven them daily alternatively. The TL is such a torquey car that doesn't need to be high revved to get the car going. Whereas the Prelude, you need to rev it up a bit to feel the push in the back. Comparing the two cars, the TL is all about refinement and lots of usable power for daily driving. Prelude is a sporty car that is fun to high rev with. In my Prelude Ive got the JDM Type S cams and the vtec crossover is quite remarkable. Ive yet raced the two cars head to head, my prelude could pull up slightly on the 03 TL Type S so I really wonder which of my car is faster now
#9
To really feel "vtec" try a Honda S2000...through MY2003...and at 6000 rpm you feel a significant instant whack in the back and the sound goes from Civic to Honda 900cc sport bike....all the way to 9000. Jeckyl and Hyde. iVtec changes the cam profile gradually as revs climb so no "whack". TL is not iVtec but I have not really felt a change at 4700.
#10
Originally posted by erikmoeser
TL is not iVtec but I have not really felt a change at 4700.
TL is not iVtec but I have not really felt a change at 4700.
Perhaps, I need to drive TSX or Prelude again.
#12
16GS FSprt,03Max,12 335is
Joined: Sep 2001
Posts: 976
Likes: 7
From: Manhattan Beach, Ca / Dallas, Tx
Originally posted by LVSBB6
I currently own both the TL and Prelude and have driven them daily alternatively. The TL is such a torquey car that doesn't need to be high revved to get the car going. Whereas the Prelude, you need to rev it up a bit to feel the push in the back. Comparing the two cars, the TL is all about refinement and lots of usable power for daily driving. Prelude is a sporty car that is fun to high rev with. In my Prelude Ive got the JDM Type S cams and the vtec crossover is quite remarkable. Ive yet raced the two cars head to head, my prelude could pull up slightly on the 03 TL Type S so I really wonder which of my car is faster now
I currently own both the TL and Prelude and have driven them daily alternatively. The TL is such a torquey car that doesn't need to be high revved to get the car going. Whereas the Prelude, you need to rev it up a bit to feel the push in the back. Comparing the two cars, the TL is all about refinement and lots of usable power for daily driving. Prelude is a sporty car that is fun to high rev with. In my Prelude Ive got the JDM Type S cams and the vtec crossover is quite remarkable. Ive yet raced the two cars head to head, my prelude could pull up slightly on the 03 TL Type S so I really wonder which of my car is faster now
#13
Originally posted by vandy786
On my 2002, I can hear it kick in at around 4400 RPM. With the sound and all, it just feels amazing.
On my 2002, I can hear it kick in at around 4400 RPM. With the sound and all, it just feels amazing.
#14
Don't think you can hear or feel a SOHC engine w/ VTEC kicking into the high-lift mode. Maybe on a DOHC VTEC. I haven't tested the new DOHC i-VTEC 4-cyl engines yet, I wonder how much different they are compared to our SOHC VTEC V6 or even a SOHC VTEC 4-cyl.
#15
Dr. TLS
Joined: Jan 2001
Posts: 1,426
Likes: 1
From: ATL
Originally posted by fla-tls
Vandy, the type S kicks in at about 5100 RPM, not 4400 RPM (unless you've changed it with a V-AFC).
Vandy, the type S kicks in at about 5100 RPM, not 4400 RPM (unless you've changed it with a V-AFC).
Originally posted by scalbert
The IMRC opens at 3800 and the VTEC change over is at 4800.
Also, the dual stage intake manifold is not a variable runner length system so there is no switching to shorter runners. The Type-S uses a variable volume system where at low speeds the effective volume available to each bank of runners is half of what it is after the butterfly valve opens at 3800 revs.
The IMRC opens at 3800 and the VTEC change over is at 4800.
Also, the dual stage intake manifold is not a variable runner length system so there is no switching to shorter runners. The Type-S uses a variable volume system where at low speeds the effective volume available to each bank of runners is half of what it is after the butterfly valve opens at 3800 revs.
#16
Originally posted by vandy786
I'm sorry, I misstated the facts. Here's how it goes down exactly, coming from a knowledgable person on an older thread:
So both of us were wrong
I'm sorry, I misstated the facts. Here's how it goes down exactly, coming from a knowledgable person on an older thread:
So both of us were wrong
#18
Intermediate
Joined: Jun 2002
Posts: 41
Likes: 0
From: Louisville, KY
Originally posted by vtec 6300
Don't think you can hear or feel a SOHC engine w/ VTEC kicking into the high-lift mode. Maybe on a DOHC VTEC. I haven't tested the new DOHC i-VTEC 4-cyl engines yet, I wonder how much different they are compared to our SOHC VTEC V6 or even a SOHC VTEC 4-cyl.
Don't think you can hear or feel a SOHC engine w/ VTEC kicking into the high-lift mode. Maybe on a DOHC VTEC. I haven't tested the new DOHC i-VTEC 4-cyl engines yet, I wonder how much different they are compared to our SOHC VTEC V6 or even a SOHC VTEC 4-cyl.
I drove a 2003 accourd 4cy 5 speed. I did not hear when vtec kicked it. But I think as other have send that you just can not hear it. The car picke picked up really nice. Had 30k miles on it. I like that 4cy.
Thread
Thread Starter
Forum
Replies
Last Post
IBankMouse
1G TSX (2004-2008)
8
06-13-2020 12:53 PM
mlody
5G TLX (2015-2020)
85
12-04-2019 02:11 PM
joflewbyu2
5G TLX (2015-2020)
139
10-08-2015 11:16 AM