Civic 1.8L iVTEC chart - Page 2

DigitalAnalog · 09-25-2006, 05:59 PM

Quote:

Originally Posted by civic_dx-g

seems pretty simple, VTEC kicks in at 3500 rpm, you drive below 3000 rpm... which part of this is unclear?

Lol agreed.

Quote:

Originally Posted by hoanger

i'm pretty anal about going over 3k RPM's in any gear unless the person in front of me is driving insanely slow and accelerating at a ridiculously slow rate then i gotta bring it up momentarily. maybe thats why i haven't gotten it..

The R18 has putrid acceleration... so if you're driving everywhere under 3... I think it's you that's "accelerating at a ridiculously slow rate" hehehe

.

civic_dx-g · 09-25-2006, 08:49 PM

fully agree!

Intrepid175 · 10-10-2006, 06:34 PM

Quote:

Originally Posted by [IVI]

Since I'm new to V-TEC, I'm trying to figure this "fuel economy cam" and "high output cam" thing. Since 1.8s only have one cam, how does it "kick in"? Are the lobes on it different at different places for what it needs to do based on load, acceleration, etc.?

I got this off the Honda Civic Forums:

http://world.honda.com/news/2005/4050705_a.html

You'll need to click on the "Watch the Movie" link to the right side of the screen. It gives an good description of the technological featues of the new 1.8L engine in the current Civics. Be advised though, it's slower than a seven year itch to load. Once it's loaded, the movie plays normally.

Also check out:

http://auto.howstuffworks.com/framed...tec/index.html

You can click the links on the left side of the screen for DOHC VTEC, SOHC VTEC, SOHC VTEC-E, and 3-stage VTEC. It's pretty cool!

Hope this helps,
Steve R.

Intrepid175 · 10-10-2006, 06:38 PM

Quote:

Originally Posted by civic_dx-g

seems pretty simple, VTEC kicks in at 3500 rpm, you drive below 3000 rpm... which part of this is unclear?

No, VTEC in this case, only "kicks in" between about 1500 and 3500 rpms and then only at relatively light throttle settings. It's there to optimize fuel economy, and does nothing for performance the way VTEC does on something like a Civic Si or a Honda S2000.

Once you pass 3500 rpms, you've locked out the VTEC cams on this engine.

The Shishpanik · 10-13-2006, 06:37 PM

Quote:

Originally Posted by Intrepid175

No, VTEC in this case, only "kicks in" between about 1500 and 3500 rpms and then only at relatively light throttle settings. It's there to optimize fuel economy, and does nothing for performance the way VTEC does on something like a Civic Si or a Honda S2000.

Once you pass 3500 rpms, you've locked out the VTEC cams on this engine.

I'm sure we'll be able to override this when New cams/ ECU reflash comes out. I'm sure if we can do that the r18 can get a lot more power and low end torque

Intrepid175 · 10-26-2006, 05:20 PM

Quote:

Originally Posted by The Shishpanik

I'm sure we'll be able to override this when New cams/ ECU reflash comes out. I'm sure if we can do that the r18 can get a lot more power and low end torque

To what end? VTEC in the R18 is designed to enhance fuel economy! It does nothing to help power or performance. Considering what it's doing with that intake valve, I would think the the rpm and load conditions underwhich it will work are relativel finite. Besides, it's a 1.8L 4-cylinder engine. "Lots of low end torque" will never be in it's repertoir.

One thing I'd be interested in doing is tapping into whatever wires get charged when the economy related VTEC is active. It would be interesting to know exactly when it's working.

Drive Safe,
Steve R.

JVanBus · 10-27-2006, 05:02 PM

There seems to be some Confusion about the Definition of VTEC and it's Purpose.

This is because the K20 i-VTEC engine was built for performace, while the R18 i-VTEC was built for Fuel Economy.

This thread is intended to give a Basic Definition of Honda's VTEC System.

For Additional Info, Follow the Link at the Bottom of the Page.

VTEC Defined

VTEC is an Acronym used to describe the Valve Train used in a Honda Engine.

i-VTEC stands for Intelligent Variable Valve Timing and Lift Electronic Control, which now includes Variable Timing Control.

It's a system developed by Honda to improve the Combustion Efficiency of its internal combustion engines throughout the RPM range.

A more Detailed Description of the K20 & R18 Engines

K20Z3: 2.0L 16-Valve DOHC i-VTEC

This particular engine is set up more for performance than fuel efficiency.

It uses an aluminum cylinder head and a dual overhead cam, four-valve-per-cylinder valvetrain incorporating the i-VTEC system.

High performance camshafts are used that allow for aggressive intake and exhaust valve openings to boost the rate that air moves into and exhaust moves out of the cylinder.

At high engine speeds, valve lift phase on the intake side is increased by five degrees and on the exhaust side by 10 degrees.

At Low RPMs, the valves follow low lift, short duration camshaft profiles to help boost low-end torque.

At High RPMs (above 5,800 rpm) the intake and exhaust valves are operated by high-lift, long-duration cam profiles, for maximum high rpm horsepower.

Variable Timing Control

As engine RPM builds, a VTC actuator advances or retards the intake cam throughout the 50 degree range, optimizing engine output and reducing emissions.

During typical operation, the intake camshaft timing is almost fully retarded at idle to help provide more stable idling.

As rpm increases, the intake camshaft is advanced, opening the intake valve sooner and providing additional valve overlap.
Roller Rockers reduce friction in the valve train.

The Camshaft is capable of advancing between 25 and 50 degrees during operation. This means the Timing in which the valves open and close are automatically retarded at idle and advanced at full throttle.

The Camshaft Lobes and Timing are implemented via an oil driven adjustable cam gear controled by your ECU/EMS.

To generate additional power throughout the rev range, the intake camshaft is continuously varying the amount of advance or retard, instantly adjusting to provide additional power as required by the driver.

R18A1: 1.8 L 16-Valve SOHC i-VTEC

Instead of optimizing performance at high RPMs, this engine is used to increase efficiency at low RPMs.

OK, So let's Check Out the Graph Below:

Bottom Line: During Low RPMs the i-VTEC system switches the Valve Timing Duration, which Optimizes Fuel Efficiency.

Top Line: During High RPMs the i-VTEC system provides High Output Valve Timing for Maximum Power.

At low RPMs, one of the two intake valves is only allowed to open a very small amount, increasing the fuel/air atomization in the cylinder and thus allowing a leaner mixture to be used.

As the engine's speed increases, both valves are needed to supply sufficient fuel/air mixture.

A sliding pin, which is pressured by oil, as in the regular VTEC, is used to connect both valves together and allows the full opening of the second valve, thus allowing a larger air/fuel mixture into the combustion chamber and ultimately generating more power.

For Additional Info, Visit HondaNews.com

http://www.hondanews.com/CatID2013?m...41013&mime=asc

Hope This Helps!

rmfa · 10-27-2006, 05:39 PM

I've been trying to get this across to people for a while. READ THIS ^^

Great post!

:cheers:

rmfa · 10-27-2006, 05:49 PM

Quote:

Originally Posted by hoanger

I, for one have never hit VTEC in our R18's... maybe I don't know how or I'm supposed to be doign something in particular... maybe someone could tell me how LOL
i'm pretty anal about going over 3k RPM's in any gear unless the person in front of me is driving insanely slow and accelerating at a ridiculously slow rate then i gotta bring it up momentarily. maybe thats why i haven't gotten it..

This post made me laugh out loud. Please tell me you are kidding. I feel sorry for your car and your motor. Its hardly even being used. Don't you think that Honda would recommend that you drive like this if it was practical? I hang around 3500-4k in my Si with way more HP. How in the world do you get anywhere in the R18 at <3k? Then the comments about the people who are accelerating ridiculously slow? ROFL. That’s you, bro. BIG TIME.

Now, please don't drive directly beside the person beside you so I can pass.

Thanks,

Kakashi · 10-27-2006, 06:00 PM

Quote:

Originally Posted by rmfa

This post made me laugh out loud. Please tell me you are kidding. I feel sorry for your car and your motor. Its hardly even being used. Don't you think that Honda would recommend that you drive like this if it was practical? I hang around 3500-4k in my Si with way more HP. How in the world do you get anywhere in the R18 at <3k? Then the comments about the people who are accelerating ridiculously slow? ROFL. That’s you, bro. BIG TIME.

Now, please don't drive directly beside the person beside you so I can pass.

Thanks,

so youre ragging on a guy who will probably never blow his engine, has admitted he doesnt know THAT much about cars, and is a safe driver? Laughing that his motor will probably last to 150k whereas youll probably float a valve at 50k?

Youre laughing now, but youre all by yourself buddy.

koreth · 11-04-2006, 03:29 PM

Quote:

Originally Posted by rmfa

This post made me laugh out loud. Please tell me you are kidding. I feel sorry for your car and your motor. Its hardly even being used. Don't you think that Honda would recommend that you drive like this if it was practical? I hang around 3500-4k in my Si with way more HP. How in the world do you get anywhere in the R18 at <3k? Then the comments about the people who are accelerating ridiculously slow? ROFL. That’s you, bro. BIG TIME.

Now, please don't drive directly beside the person beside you so I can pass.

Thanks,

funny, THIS post actually made me laugh out loud... Have you ever driven in a non-si? I gas it enough to make it shift at 3500 or so (got an automatic), and i'd say 90% of the time i am at least 5-6 car lengths ahead of everyone behind me and beside me (when i'm the first person at the light obviously). I think you, and a lot of other SI owners i'm starting to read, underestimate the R18.

DigitalAnalog · 11-04-2006, 11:56 PM

Quote:

Originally Posted by koreth

funny, THIS post actually made me laugh out loud... Have you ever driven in a non-si? I gas it enough to make it shift at 3500 or so (got an automatic), and i'd say 90% of the time i am at least 5-6 car lengths ahead of everyone behind me and beside me (when i'm the first person at the light obviously). I think you, and a lot of other SI owners i'm starting to read, underestimate the R18.

I have an EX and I'm not underestimating the R18... I just think it's boring. It's peppy and good on gas, and better than any other Civic engine made (B16A2 excluded) but that's more or less the extent of what I can say for it. For you, since you drive a slushbox it's different. Just press the pedal and away you go. Driving stick puts a different feel on the car and you find out how torqueless (typical Honda) the engine really is.

The K20's can't even be classified in the same group as a R18 so I really don't think SI owners are underestimating us... they already know the difference

. That being said, I also came from a Skyline and I ride bikes, so I the difference between fast and slow... and the R18 is not fast

koreth · 11-05-2006, 03:00 PM

never said it was fast. its all relative anyway... I used to drive an explorer and my little r18 is fast for me.

i'm simply saying that i read a lot of statements totally underestimating the r18's acceleration/speed. I dont "hold traffic up" even when i am keeping it below 2500rpm (very rarely). It can hold its own compared to (like i said) probably 90% of the cars out there for every day driving.

grc0456 · 11-15-2006, 04:35 PM

No one could ever claim the R18 Civics are fast, and if anyone bought one thinking that then they are sorely disappointed. That being said I think my 06 EX coupe MT is peppy and economical. I can baby it and get high 30's mpg or rev it up and have a blast rowing up and down the gearbox on twisty back roads. It handles beautifully for a car costing so little. Simply put, its never going to win many races, but it is sure fun to drive IMO. Looks nice, too!

bobbo · 01-05-2007, 03:50 AM

Please get off your high horse. He can drive any way he likes to as long as he's within the speed limit. Some of us got the car for commuting purposes and for saving gas. Unless he's hogging the fast lane I don't see there's any reason wrong with the way he drives. I personally don't break 3000rpm much either unless passing a car way slower than me.

What you said will be equivalent of me saying, "I have a deposit on the '08 m3, I don't know how you laugh at people being slow with only 200hp, that's you bro, BIG TIME."

Please spare me the once mine is turboed it will beat your 60k dollar car that's just childish. You can have the win. I will just enjoy my day on the track.

Quote:

Originally Posted by rmfa

This post made me laugh out loud. Please tell me you are kidding. I feel sorry for your car and your motor. Its hardly even being used. Don't you think that Honda would recommend that you drive like this if it was practical? I hang around 3500-4k in my Si with way more HP. How in the world do you get anywhere in the R18 at <3k? Then the comments about the people who are accelerating ridiculously slow? ROFL. That’s you, bro. BIG TIME.

Now, please don't drive directly beside the person beside you so I can pass.

Thanks,

bobbo · 01-05-2007, 03:52 AM

Well put. Got my Civic LX for the same reason. I bought the car to go from A to B but I was pleasantly surprised on how well it drives.

Quote:

Originally Posted by grc0456

No one could ever claim the R18 Civics are fast, and if anyone bought one thinking that then they are sorely disappointed. That being said I think my 06 EX coupe MT is peppy and economical. I can baby it and get high 30's mpg or rev it up and have a blast rowing up and down the gearbox on twisty back roads. It handles beautifully for a car costing so little. Simply put, its never going to win many races, but it is sure fun to drive IMO. Looks nice, too!

GlennS · 01-12-2007, 02:24 PM

January 2007:
I've updated (corrected) the text I have regarding the iVTEC chart link that I'd posted on this site back in June of 2006.

For a complete description of, and technical information about iVTEC implimentation in the R18, see this link to "Asian 8G Civic R18A Engine Tech Overview" at the Temple of VTEC Asia site. (It's the same basic R18 iVTEC technology that's used--here--and in Asia.)

Regards,
Glenn in CT

d_hidayat2000 · 01-25-2007, 02:51 PM

Hi Gina, yes honda is SOHC but have 16 valves, 2 in, 2 out
vtec activate the lobe opening the intake valve
in "eco" mode, only activate 1 intake valve and will activate 2 intake valve in high power mode

Smoot · 08-15-2007, 02:42 PM

damn learn alot about my motor :thumbup:

tpofa-07LX · 08-23-2007, 09:39 PM

I got my car yesterday and have driven around 50 miles but am already a 2/3 of a tank(1/3 of the bars on the fuel gauge used up). Should I keep it below 3500rpm in order to get better gas mileage? I have a manual and have been shifting at higher rpms and enjoying the new car though..

10-27-2006, 05:02 PM	#27 (permalink)
JVanBus Member Join Date: Oct 2006 Location: S.F. Bay Area Posts: 32 Josh iTrader: 0 / 0%	VTEC Confusion There seems to be some Confusion about the Definition of VTEC and it's Purpose. This is because the K20 i-VTEC engine was built for performace, while the R18 i-VTEC was built for Fuel Economy. This thread is intended to give a Basic Definition of Honda's VTEC System. For Additional Info, Follow the Link at the Bottom of the Page. VTEC Defined VTEC is an Acronym used to describe the Valve Train used in a Honda Engine. i-VTEC stands for Intelligent Variable Valve Timing and Lift Electronic Control, which now includes Variable Timing Control. It's a system developed by Honda to improve the Combustion Efficiency of its internal combustion engines throughout the RPM range. A more Detailed Description of the K20 & R18 Engines K20Z3: 2.0L 16-Valve DOHC i-VTEC This particular engine is set up more for performance than fuel efficiency. It uses an aluminum cylinder head and a dual overhead cam, four-valve-per-cylinder valvetrain incorporating the i-VTEC system. High performance camshafts are used that allow for aggressive intake and exhaust valve openings to boost the rate that air moves into and exhaust moves out of the cylinder. At high engine speeds, valve lift phase on the intake side is increased by five degrees and on the exhaust side by 10 degrees. At Low RPMs, the valves follow low lift, short duration camshaft profiles to help boost low-end torque. At High RPMs (above 5,800 rpm) the intake and exhaust valves are operated by high-lift, long-duration cam profiles, for maximum high rpm horsepower. Variable Timing Control As engine RPM builds, a VTC actuator advances or retards the intake cam throughout the 50 degree range, optimizing engine output and reducing emissions. During typical operation, the intake camshaft timing is almost fully retarded at idle to help provide more stable idling. As rpm increases, the intake camshaft is advanced, opening the intake valve sooner and providing additional valve overlap. Roller Rockers reduce friction in the valve train. The Camshaft is capable of advancing between 25 and 50 degrees during operation. This means the Timing in which the valves open and close are automatically retarded at idle and advanced at full throttle. The Camshaft Lobes and Timing are implemented via an oil driven adjustable cam gear controled by your ECU/EMS. To generate additional power throughout the rev range, the intake camshaft is continuously varying the amount of advance or retard, instantly adjusting to provide additional power as required by the driver. R18A1: 1.8 L 16-Valve SOHC i-VTEC Instead of optimizing performance at high RPMs, this engine is used to increase efficiency at low RPMs. OK, So let's Check Out the Graph Below: Bottom Line: During Low RPMs the i-VTEC system switches the Valve Timing Duration, which Optimizes Fuel Efficiency. Top Line: During High RPMs the i-VTEC system provides High Output Valve Timing for Maximum Power. At low RPMs, one of the two intake valves is only allowed to open a very small amount, increasing the fuel/air atomization in the cylinder and thus allowing a leaner mixture to be used. As the engine's speed increases, both valves are needed to supply sufficient fuel/air mixture. A sliding pin, which is pressured by oil, as in the regular VTEC, is used to connect both valves together and allows the full opening of the second valve, thus allowing a larger air/fuel mixture into the combustion chamber and ultimately generating more power. For Additional Info, Visit HondaNews.com http://www.hondanews.com/CatID2013?m...41013&mime=asc Hope This Helps! Last edited by JVanBus; 10-30-2006 at 12:53 AM.

01-12-2007, 02:24 PM	#37 (permalink)
GlennS Senior Member Join Date: Apr 2006 Location: Connecticut Age: 55 Posts: 574 iTrader: 0 / 0%	January 2007: I've updated (corrected) the text I have regarding the iVTEC chart link that I'd posted on this site back in June of 2006. For a complete description of, and technical information about iVTEC implimentation in the R18, see this link to "Asian 8G Civic R18A Engine Tech Overview" at the Temple of VTEC Asia site. (It's the same basic R18 iVTEC technology that's used--here--and in Asia.) Regards, Glenn in CT Last edited by GlennS; 01-12-2007 at 02:34 PM.

LinkBacks (?) LinkBack to this Thread: http://www.8thcivic.com/forums/civic-coupe-sedan/8370-civic-1-8l-ivtec-chart.html
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Civic 1.8L iVTEC chart - 8th Generation Honda Civic Forum	This thread	Refback	12-23-2007 08:09 PM
Civic 1.8L iVTEC chart - Page 2 - 8th Generation Honda Civic Forum	This thread	Refback	12-13-2007 07:00 AM

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09-25-2006, 08:49 PM	#22 (permalink)
civic_dx-g Member Join Date: Jul 2006 Posts: 58 iTrader: 0 / 0%	fully agree!

10-27-2006, 05:39 PM	#28 (permalink)
rmfa Senior Member Join Date: Sep 2006 Location: Austin, TX Age: 28 Posts: 3,689 Ronnie iTrader: 2 / 100%	I've been trying to get this across to people for a while. READ THIS ^^ Great post! :cheers:

11-05-2006, 03:00 PM	#33 (permalink)
koreth Junior Member Join Date: Sep 2006 Posts: 19 iTrader: 0 / 0%	never said it was fast. its all relative anyway... I used to drive an explorer and my little r18 is fast for me. i'm simply saying that i read a lot of statements totally underestimating the r18's acceleration/speed. I dont "hold traffic up" even when i am keeping it below 2500rpm (very rarely). It can hold its own compared to (like i said) probably 90% of the cars out there for every day driving.

11-15-2006, 04:35 PM	#34 (permalink)
grc0456 Member Join Date: Oct 2006 Location: Boston, MA Posts: 99 Gary iTrader: 0 / 0%	No one could ever claim the R18 Civics are fast, and if anyone bought one thinking that then they are sorely disappointed. That being said I think my 06 EX coupe MT is peppy and economical. I can baby it and get high 30's mpg or rev it up and have a blast rowing up and down the gearbox on twisty back roads. It handles beautifully for a car costing so little. Simply put, its never going to win many races, but it is sure fun to drive IMO. Looks nice, too!

01-25-2007, 02:51 PM	#38 (permalink)
d_hidayat2000 Junior Member Join Date: Jul 2006 Posts: 4 iTrader: 0 / 0%	Hi Gina, yes honda is SOHC but have 16 valves, 2 in, 2 out vtec activate the lobe opening the intake valve in "eco" mode, only activate 1 intake valve and will activate 2 intake valve in high power mode

08-15-2007, 02:42 PM	#39 (permalink)
Smoot Senior Member Join Date: May 2007 Location: Tucson, Arizona Posts: 537 iTrader: 0 / 0%	damn learn alot about my motor :thumbup:

08-23-2007, 09:39 PM	#40 (permalink)
tpofa-07LX Senior Member Join Date: Aug 2007 Location: East NC (aka nowhere) Posts: 356 iTrader: 0 / 0%	I got my car yesterday and have driven around 50 miles but am already a 2/3 of a tank(1/3 of the bars on the fuel gauge used up). Should I keep it below 3500rpm in order to get better gas mileage? I have a manual and have been shifting at higher rpms and enjoying the new car though..