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View Full Version : When does the VTEC kick in??



Toby
05-08-2004, 08:56 PM
At what RPM does it kick in because I cant feel it :oops:

Toby
05-08-2004, 09:04 PM
its a VTi model by the way :D

petrovski
05-08-2004, 11:30 PM
it changes depending on how hard you push it i think

form memory its around 2500-3700 depending . . .

Pete :)

Toby
05-08-2004, 11:44 PM
So if I hold it flat it will come on at 2500??

TypeG
06-08-2004, 12:35 AM
will vtec point change?
that's new to me

also u will hardly hear unless u get exhuast done i think....
also dun expect Vtec on Jazz will fit as exciting as B series Vtec

Jus-10
06-08-2004, 08:25 AM
6000rpm? Man that's just before redline....

You won't really feel it or hear it with an exhaust...I never could. You can sort of pick it up with a pod filter attached, but even then it's pretty hard to tell on WOT.

From my experience, it seems to come on between the 4,000-4,500 mark. I can't be any more exact until I get the V-AFC2 wired up.

Psyklops
06-08-2004, 08:41 AM
dunno what motor the Jazz Vti has, but in my EG Vti, I have noticed it kicks in at about 4800 rpm or so....D16Y SOHC VTEC.

petrovski
06-08-2004, 10:10 AM
ok i haevnt looked up the honda website so it may say somethign different but . . .

from a fast fours article i ripped out, page 20, (so i dont know what issue) they road tested a vtis cvt 7 speed.
Under the fast facts it says:


Induction: VTEC between 2300 and 3600rpm

anyway ive been in the car wiht one of my friends and if you listen really carefully you can hear it. we were doing this whilst accelerating slowly and it did kick in around the 3600 mark. so maybe if you did accelerate quickly it would kick in at teh 2300 mark, not sure.


as for vtec kicking in around 6000rpm :shock: :? the redline is about 6300rpm and the rev cut about 6700 or 6800rpm from memory.

Pete :)

TypeG
06-08-2004, 11:19 AM
lol
if u are first time driving a honda, i will say NO, u will hear vtec shouting LOUDLY especially once u change exhuast and intake
even single vtec EG will hear it

Jus-10
06-08-2004, 12:18 PM
I swear I can't hear it man (not all the time)....it just sounds like any other car with a pod or a zorst on it...

I'll have to pay special attention to it next time I take it out.

muli
06-08-2004, 01:28 PM
ok i haevnt looked up the honda website so it may say somethign different but . . .

from a fast fours article i ripped out, page 20, (so i dont know what issue) they road tested a vtis cvt 7 speed.
Under the fast facts it says:


Induction: VTEC between 2300 and 3600rpm

anyway ive been in the car wiht one of my friends and if you listen really carefully you can hear it. we were doing this whilst accelerating slowly and it did kick in around the 3600 mark. so maybe if you did accelerate quickly it would kick in at teh 2300 mark, not sure.


as for vtec kicking in around 6000rpm :shock: :? the redline is about 6300rpm and the rev cut about 6700 or 6800rpm from memory.

Pete :)


its somewhere between 6800-7000rpm, ive hit mine twice but its just so damn hard to notice as it revs so smoothly and never really sounds loud plus being slightly tall(184cm) i have trouble seeing past 5500rpm cause of the design of the dashboard unless i drive like a typical honda driver with their cap backwards and seat reclined max down :lol:
For VTEC kicking in, i dont know what it is but there is a slight howling noise that starts to develop at bout 3600rpm.

i guess you could buy one of those vtec gauges, the light lights up when vtec is on, they even got em for jazz. Im at work so cant look up the link but they are roughly around $90 from memory

coladuna
06-08-2004, 02:10 PM
I don't know about Jazz but VTEC at 3600rpm seems way too early. My Prelude's VTEC kicks in at 5500rpm.

felixR
06-08-2004, 11:09 PM
a few nights ago i drove my mate's VTI-S (Sp00n) and i redlined it.
from what i heard from the engine, vtec kicks in somewhere in between 4000 and 5000rpm.. it's very subtle but u could hear something! nothing like my car 8) =P

i agree with coladuna, 3600rpm seems way too early.

dc
07-08-2004, 12:06 AM
just had a play with mine.The between 2300 and 3600 figure 'sounds' abt right. Probly unnoticable cos it comes in so early. But when u hear it come in its pretty obvious. 'feeling' it is another matter.

wyl03
12-08-2004, 05:42 PM
i had a "play" with mine a few nights ago. accelerating up to 5K+ after each change of lights.

damn .. couldn't really tell. THOUGHT i heard some thign .. it's either the vtec or the engine protesting.

petrovski
13-08-2004, 05:50 PM
hahaha

all these people and its still not clear when it cuts in :? :roll:

oh well

here's something to do for fun (and it might even help who knows)

when your in a jazz and your going down a hill or capable of cruising along or it may even work when your parked (havent tried it parked yet)

have it in neutral or foot on the clutch. MAKE SURE ITS NOT IN GEAR!!

make sure your listening and watching the tacho!

hit the accelerator as fast as you can so it hits the floor before the revs start to pick up (jazz isnt the worlds most responsive car)

when they do watch and listen as the revs increase (really quickly) but at a certain point the engine will scream and the revs rise much quicker when it hits vtec.

from my observation it seemed to be a between 3500rpm and 4000rpm.
it could be 5000rpm or watever anyone think it is but thats just MY observation.

anyway give it a go if you want and watch out for the rev cut

Pete :)

muli
15-08-2004, 01:32 PM
right from honda's website
http://www.honda.com.au/jazz/vti-s/=technology/_powertrain_vtec+details.htm

petrovski
15-08-2004, 01:55 PM
lol that settles it! :P

wonder why noone looked that up before :?

Pete :)

muli
15-08-2004, 02:05 PM
i just remembered this morning that there was something on the honda website about this when i was buying my car early this year. Also read somewhere that the engagement of the VTEC system is seamless or something as such

Lil_VTEC
10-09-2004, 09:08 PM
My friend has a 2000 model integra type r with extractors, zorst and power fc etc and you DEFINATELY know when vtec kicks in.
As im new to hondas and vtec i was trying to find the same effect when i test drove the jazz and found nothing... haha

Something i wanted to know (albeit may sound dumb but..) when it sez
Between 2,300 to 3,600 rpm, VTEC piston engages the two intake rocker arms together. The engagement speed is variable, depending on the input sensor signals from the VTEC management system.

does it mean that vtec only works between 2300-3600 or that vtec goes from 2300/3600 to redline???? :o

2ds
10-09-2004, 11:17 PM
=)~

Toby
10-09-2004, 11:24 PM
does it mean that vtec only works between 2300-3600 or that vtec goes from 2300/3600 to redline???? :o

All the way to redline.

Lil_VTEC
11-09-2004, 01:53 PM
Toby wrote

All the way to redline.

Ahhh very good. :D
Cheers :thumbsup:

muli
13-09-2004, 10:18 AM
with the aircon full blast it seems to get alot more urge just under 4000rpm but as i already posted the quote of honda website there's not much to wonder anymore

cda96
13-09-2004, 10:29 AM
At what RPM does it kick in because I cant feel it :oops:


sohc accord... at 4grand mayb 4.5, definately hear it but u dun feel shit besides sum inscreased acceleration.. there aint no kik as sum might say!

cda96
13-09-2004, 10:32 AM
but hey its different for every car depending on engine of coarse

badsector
28-09-2004, 08:07 PM
agree! depending on the engine, vtec engagement points are different. I had a del sol (b16a) and vtec kicks in at 5,000rpm's where as my current car which is a honda integra vti-r (b18c) vtec kicks in at 6,000rpm. this is not an approximate figure but just a rough estimate from me looking at the tachometre when vtec begins to scream :) These are figures from standard engines with an airfiter. As for the other model honda's, i don't know as i'm only speaking with experience. most of you know the crx's and civic vti-r's both have the same engines. With the sohc's i am not sure but from what afew is talking about above, the engagement point at 3,000rpm's and that sounds way too early. my crx with a uni filter seemed to scream alot louder than my integra with a K&N though, anyone know how i could get the same vtec noise out of my b18c as i got from my b16a?

Jus-10
29-09-2004, 08:48 AM
badsector - perhaps by posting in the relevant forum you may find more answers to your question. You may find your answer in the technical forum.

In the Jazz forum we are concerned with info relevant to L15As, sometimes the K20A and on the rare occasion, the L13A.

dark138
29-09-2004, 12:02 PM
Jus-10 jazz comes in L13As?
which ones comes with L13As and which ones are the L15As?

about the vtech on the jazz, i think its really pussy. i dun really feel anything besides the engine roaring like a vtech. for one it has the sounds

Jus-10
29-09-2004, 12:56 PM
There is no 'H' in vtec.....you'll get flamed big time if some of the other guys catch you :p

The L13A is in the GLi. It is the DSi engine (8 valve SOHC with twin plugs per cylinder)

L15A is in the VTi and VTi-S.

ahcash
24-05-2005, 01:06 PM
right from honda's website
http://www.honda.com.au/jazz/vti-s/=technology/_powertrain_vtec+details.htm

Between 2,300 to 3,600 rpm, VTEC piston engages the two intake rocker arms together. The engagement speed is variable, depending on the input sensor signals from the VTEC management system.



Just thought I bring this thread alive.. While reading this Review (http://asia.vtec.net/Reviews/JazzVtec/index.html) from this thread (http://www.ozhonda.com/forum/showthread.php?t=20895)

and I quote ....



But after 3000rpm, it's a different story especially after VTEC opens both intake valves after 3,500rpm. The powerchart clearly shows a big surge in torque and power from the VTEC after 3,500rpm. The VTEC's torque curve is higher than the i-DSI at all rpms points after 3,000rpm, the biggest difference at around 5,000rpm where the VTEC delivers over 2.5kgm more torque and from visual estimation from the charts, ~30ps more than the i-DSI. The VTEC of course also revs 300rpm more than the i-DSI.


http://asia.vtec.net/Reviews/JazzVtec/15VTEC.jpg

Looking at the chart, I am quite convinced that the VTEC on GD3 1.5VTEC kicks in after 3,500rpm where there is a big surge in the torque and power. :thumbsup:

redliner
24-05-2005, 02:26 PM
Jazz vtec kicks in pretty low.. izit because of its i-Vtec?

Honda 94 DANTE
24-05-2005, 02:37 PM
i got a honda civic vti with v-tec it cicks in at 4000, but apparently u can get a vtec control wer u can adjust wen u want it to cick in my mates cousins got it n its wild.

i wanna know wer to buy 1 and how much it will cost?

aaronng
24-05-2005, 02:38 PM
It's tuned for city driving since the Fit in Japan is used mainly in the cities. Hence, tuning the engine for low to middle revs would make it more peppy. That's why they set the VTEC point at 3500rpm. from 1000-3500rpm, it's running on one profile, and 3500rpm to redline, it's it the 2nd cam profile. Just nice, because not many people rev above 3500rpm in the city, and when out on the highways, you can just go above 3500rpm for overtaking.

Jus-10
24-05-2005, 04:07 PM
Well when my V-AFC 2 is set to zero, vtec comes on at 2900rpm and turns off at 2800. (A red LED lights up when vtec is engaged)

So there is the answer...short and sweet.

panda
25-05-2005, 11:13 AM
funny how in the past honda owners complain the vtec came in too late at5-6000rpm, now we are concerned with vtec coming on too early for our jazz's

i cant seem to distinctively pick up the vtec crossover because of low revs but i can feel it pulling, someone with full exhaust modifications can maybe share the light on L15 boobaa? :rolleyes:

Jus-10
25-05-2005, 07:14 PM
You won't feel it, compared to the twin cam vtec engines (B-series, F20C, H22A, et al)

It is a different type of vtec system that is used. In the Jazz, it is an economy version. When vtec is not engaged, the engine runs on 3 valves per cylinder, and when vtec engages it runs 4. It's not like in the twin cam version where once vtec engages, you are engaging a different cam profile. In simple terms, the Jazz vtec just opens another valve.

Hope that helps a bit

racinghonda
25-05-2005, 08:10 PM
Having one of the intake valves closed below 3500 promotes swirling of the air/fuel mixture. This means the engine can run extra lean and hence save fuel. It also improves low end torque by increasing the intake air velocity entering the cyclinder. Very clever.

Hoyinpng
26-05-2005, 07:16 PM
Anyone here on the forum have vtec controller??
Being able to control when vtec kikcs into place.. earlier..

panda
26-05-2005, 07:48 PM
Anyone here on the forum have vtec controller??
Being able to control when vtec kikcs into place.. earlier..

you want earlier than 3500rpm? will lose the fuel effiency that the jazz is designed for

Hoyinpng
26-05-2005, 08:07 PM
for me.. nope...
but for those who want to get the MOST out of the little jazz..
thats the best way to go.. i rekon..

Jus-10
26-05-2005, 09:26 PM
panda - re-read the posts. It kicks in at 2900rpm.

And yes, I have vtec controll via the V-AFC 2.

Hoyinpng
27-05-2005, 02:29 PM
panda - re-read the posts. It kicks in at 2900rpm.

And yes, I have vtec controll via the V-AFC 2.

when did u set it to kick in???

civiceg9
27-05-2005, 04:09 PM
The L-series VTEC engine is design only for fuel economy and low emissions. It uses only a 2 rocker arm system compare to the tradiational 3 rocker arm system. The VTEC starts at around 3000rpm and focus on mid rev.

If you are interested take a read of the L-series engine on TOV :D
http://asia.vtec.net/Series/FitJazz/lseries/index.html

SiR CRX
28-05-2005, 04:14 AM
Jus-10 is it worth getting a VTEC controller in a Jazz? I was also considering one but I have heard that they do more harm than good on a stock engine. What do you think?

panda
28-05-2005, 07:53 AM
personally i would think a controller is of real benefit if you have modified your car in a specific way or purpose ie for track or drag and use the controller to tune your fuel mixture, vtec x-over etc to suit the mods

for jazz daily driving and the vtec point already set so low i would not consider one, my 5c :o

kuso
28-05-2005, 08:24 AM
I don't see too much point in a V-AFC. Honda would have accounted for the low power output of the jazz and compensated for it by the Vtec engagement ranges. Generally I have heard from many that changing these does more harm than good. Im sure Jus-10 seconds this. Its a good feature to have around, and to know when ur vtec actually hits, but other than that, i severly doubt its use and the price doesn't justify it either. Of course I'm not stopping anyone from buying one. Just my 2 cents.

asiansquad
11-06-2005, 03:36 AM
can use vafc for looks ;)

i hven't tuned my car yet, i've left the settings default and vtec is kicking in @ 2500rpm with throttle on >25%

if the throttle is < 25% vtec kicks in @ 3000rpm

dundas
20-07-2005, 12:40 PM
hmmz.. just stick a temporary VTEC light to solve all your problems :D connect it to your vtec solenoid or if u have the guts, splice u vtec wire from ur ecu loom and your set to find out at what rpm it kicks in.
I did this to my accord (permanent one) looks pretty and proves to people who don't believe how low some VTEC in hondas kick in.

muli
20-07-2005, 12:58 PM
hmmz.. just stick a temporary VTEC light to solve all your problems :D connect it to your vtec solenoid or if u have the guts, splice u vtec wire from ur ecu loom and your set to find out at what rpm it kicks in.
I did this to my accord (permanent one) looks pretty and proves to people who don't believe how low some VTEC in hondas kick in.


all we need is someone to try it, how much damage can you possible do?

ahcash
20-07-2005, 02:51 PM
all we need is someone to try it, how much damage can you possible do?

Not much damage.. Muli .. we vote for you to try it first :D

muli
20-07-2005, 02:54 PM
how different would it be from wiring up a VAFC2 or vtec indicator

joyride
20-07-2005, 03:12 PM
a friend in the US said that hes seen peoples ECU's fry because of vtec lights (eventually, not straight away).

asiansquad
20-07-2005, 03:14 PM
i got a vafc2 on my car..hven't done any tuning yet and vtec kicks in @ 2200rpm on my jazz

ahcash
20-07-2005, 03:27 PM
i got a vafc2 on my car..hven't done any tuning yet and vtec kicks in @ 2200rpm on my jazz

Ronald, I thought you said before that when you send your VTEC setting on the VAFC2, you VTEC will not kick in at all? You've got that fixed, have you? What was the problem?

asiansquad
20-07-2005, 05:20 PM
that's only if i mess around with the vtec settings..i've left everything on default..and vtec kicks in @ 2200 rpm

fadz
20-07-2005, 06:14 PM
if u really want ur vtec to scream...simple setup as iv got for the moment...
pod filter with piping and extractors and dammmm hear ur VTEC roar its guts out,
got a 94 vti civic.

Jus-10
20-07-2005, 06:22 PM
You guys are hopeless...how many times have I had to say what the vtec cut-in point is? I have run it on the vafc2 and I have posted it up before and in this thread.

Fadz, you drive a civic VTi..completely different vtec setup to the jazz.

I am closing this thread.