answer to an age old VTEC question
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answer to an age old VTEC question
I got bored one day and decided to hook up a light to my VTEC solenoid just to find out when it comes on. It kicks in between 2,500-3,000 rpm's and is also TP activated when your cruizing around 3,000 rpms in 5th gear.
i belive the reason that the light comes on at such a low rpm has something to do w/ the 3 stage vtec system that our vehicles use.....i remember reading something in regards to the 3 stage system, that at like idle-2500 is stage one, 2500-4500 is stage to, and 4500-redline is a 3rd stage......if that is the case, then the vtec selonoid might actuate, but the air/fuel map settings may still be different then the ones used for WOT in the higher rpm band.....interesting
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Rep Power: 0 << No 3-stage in our engines. Only the D15B's have 3-stage right now.
vtec types >>
your link is outdated, as is that other vtec link everyone posts
from what I've heard, the d17a2 has a quasi 3-stage vtec with on valve below 2500, and then a higher cam at higher RPM (4500ish perhaps)
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Rep Power: 0 Ya, I know that info is kinda old, but up until this point, I have yet to see any concrete info on whether or not our engines have 3-stage.
I'm not doubting you or anything, but I would like to somebody post some reliable info about what exactly our engines have... cuz I'm really curious too.
I'm not doubting you or anything, but I would like to somebody post some reliable info about what exactly our engines have... cuz I'm really curious too.
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Rep Power: 419 For a three stage VTEC we would need to have 3 different cam profiles on the VTEC camshaft. We don't. We have only two. I saw a site with pictures of 2001 Civic cutaways and I saw one that showed the engine. It was a really tiny picture and the link to the larger version of the picture was dead beyond dead. I tried searching for it, but I got nowhere. I do have these though:
Autotranscut.gif
Manualtranscut.gif
Rearsuspquarterview.gif
Edit: Pictures were huge, I linked to them instead.
Autotranscut.gif
Manualtranscut.gif
Rearsuspquarterview.gif
Edit: Pictures were huge, I linked to them instead.
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Rep Power: 0 this is all "i've heard" so it's not perfect....
one of these days i'll just rip my valve cover off, thrown the badboy on a dyno, put oil deflectors wherever our heads spray oil, and check it out [IMG]i/expressions/face-icon-small-smile.gif[/IMG]
anyways, from what i've heard, we have two intake valves (well this I know [IMG]i/expressions/face-icon-small-wink.gif[/IMG]) and below 2500ish only one opens, and above that the other locks into place with the 1st valve, both riding the 1st cam lobe....
above like 4500ish they both switch to the 2nd cam profile.
so its kinda like 3stage vtec, but with 2 lobes.... take this with a grain of salt but I've heard it a few places....
Ronin : sorry if that sounded like a flame, I wasn't trying to be mean [IMG]i/expressions/beer_yum.gif[/IMG]
one of these days i'll just rip my valve cover off, thrown the badboy on a dyno, put oil deflectors wherever our heads spray oil, and check it out [IMG]i/expressions/face-icon-small-smile.gif[/IMG]
anyways, from what i've heard, we have two intake valves (well this I know [IMG]i/expressions/face-icon-small-wink.gif[/IMG]) and below 2500ish only one opens, and above that the other locks into place with the 1st valve, both riding the 1st cam lobe....
above like 4500ish they both switch to the 2nd cam profile.
so its kinda like 3stage vtec, but with 2 lobes.... take this with a grain of salt but I've heard it a few places....
Ronin : sorry if that sounded like a flame, I wasn't trying to be mean [IMG]i/expressions/beer_yum.gif[/IMG]
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From: Utah, while roaming Montana, Idaho and Wyoming
Rep Power: 0 Our gens real improvement is torque.
Vtec is a different system than Vtec-E altogether
Vtec-e deactivates an intake valve below 3200rpm, above 3200 both intake cams are active (HX)
VTEC switches cams for power (EX)
2 completely different processes
3 stage vtec is a combination of the aforementioned VTEC and VTEC-E
if we were a 3 stage Vtec, it would be labled as.
================================================== =================================================
TOV Asia
LINK!
Vtec is a different system than Vtec-E altogether
Vtec-e deactivates an intake valve below 3200rpm, above 3200 both intake cams are active (HX)
VTEC switches cams for power (EX)
2 completely different processes
3 stage vtec is a combination of the aforementioned VTEC and VTEC-E
if we were a 3 stage Vtec, it would be labled as.
================================================== =================================================
TOV Asia
LINK!
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Rep Power: 0 << Umm guys, our VTEC-E is not for performance, its for economy. wheras the Ex on the previous gen was for perfomance.
Our gens real improvement is torque.
Vtec-E is a different system than Vtec altogether
Vtec-e deactivates an intake valve below 3200rpm, above 3200 both intake cams are active
VTEC switches cams for power
completely different processes >>
ummm... we don't have VTEC-E either, unless you own an HX. Check the Honda.com site. So what exactly are you pointing out here about VTEC-E vs. our car's regular VTEC?
Technically speaking, we have simple 2-freakin-stage SOHC VTEC. No "real" 3-stage (at least, I don't think we do based on the links I've read), and no VTEC-E. [IMG]i/expressions/face-icon-small-smile.gif[/IMG]
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Rep Power: 419 Hum... Okay. They mention a D15B engine as having 3-stage VTEC. There is nothing there about our D17A, but I think our cars are what they call 3-stage VTEC. After all, I think the D15B is the engine they use in Japan in the 7th gen civics. It's just weird that they call it 3-stage VTEC since this implies that the stages in regular 2-stage VTEC refer to the cam profiles. I though that since 2-stage VTEC has two cam profiles, then 3-stage VTEC should have 3 cam profiles. Oh well, weirdness.
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ok i stand corrected, we are the sohc vtec implimentation, I swear at one point honda had Vtec-E for the Ex model as well the only diff being that hx was lean burn and ours wasnt, obviously that error was corrected or I was seeing things again.
Still it answers the question of which Vtec we have. it aint 3 stage VTEC
sorry bout that guys
ok i stand corrected, we are the sohc vtec implimentation, I swear at one point honda had Vtec-E for the Ex model as well the only diff being that hx was lean burn and ours wasnt, obviously that error was corrected or I was seeing things again.
Still it answers the question of which Vtec we have. it aint 3 stage VTEC
sorry bout that guys
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Rep Power: 0 right grey, but the D17 is just a regular SOHC Vtec. we dont get the toys here in North America as honda delivers to the asian market.
(re: Civic type R) but we do get the coupe and they dont.
but there are numerous changes to the D17 engine compared to the preceding D16
the valve chamber shape is different, (cant remember how more square than elongated or visa versa) to quiet the engine noise down and obviously increased torque with the increased displacement. Thus honda also moved even more toward economy than performance again with the ULEV standard that was not found on the Vtec models of the previous generation which the non vtecs were LEV. Thus the HP improvement with the dx/lx models with the D17 was higher wheras the Ex Hp stayed the same.
I do remember reading somewhere that Honda plans to impliment the I-VTEC engine to all honda vehicles by 2005, for the civic it would be either the final year of the 7th gen (an Si coupe??? <WEG> ok we can dream) or the 8th gen that would get it,
I-Vtec is Honda's new Baby, all of the new models like the CRV, RSX, civic Si have it,and most likely the new accords will next year and the new pilot.
however seeing the diversity now, D17, Gx, hybrid and the k20 in the Si, who knows what could happen. honda HAS changed engines or varients, mid generation with emerging technology before with the implimentation of pgm-fi in the 4th gen and Vtec in the 5th gen in 93.
(re: Civic type R) but we do get the coupe and they dont.
but there are numerous changes to the D17 engine compared to the preceding D16
the valve chamber shape is different, (cant remember how more square than elongated or visa versa) to quiet the engine noise down and obviously increased torque with the increased displacement. Thus honda also moved even more toward economy than performance again with the ULEV standard that was not found on the Vtec models of the previous generation which the non vtecs were LEV. Thus the HP improvement with the dx/lx models with the D17 was higher wheras the Ex Hp stayed the same.
I do remember reading somewhere that Honda plans to impliment the I-VTEC engine to all honda vehicles by 2005, for the civic it would be either the final year of the 7th gen (an Si coupe??? <WEG> ok we can dream) or the 8th gen that would get it,
I-Vtec is Honda's new Baby, all of the new models like the CRV, RSX, civic Si have it,and most likely the new accords will next year and the new pilot.
however seeing the diversity now, D17, Gx, hybrid and the k20 in the Si, who knows what could happen. honda HAS changed engines or varients, mid generation with emerging technology before with the implimentation of pgm-fi in the 4th gen and Vtec in the 5th gen in 93.
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ok i stand corrected, we are the sohc vtec implimentation, I swear at one point honda had Vtec-E for the Ex model as well the only diff being that hx was lean burn and ours wasnt, obviously that error was corrected or I was seeing things again. >>
yeah they did call it that, then changed the labelling for the 2002's
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