I have a b18c GSR vtec engine in my little 90 civic. My question is... Assuming i was driving a long distance, at above 100 mph. Is there any danger and/or extra wear in running the vtec for extended periods of time. Just curius if vtec should be mostly used for racing and kept under vtec for extended driving. thanks

 

its prob not good for the valvtrain, but if you are bright enough to be driving that fast on public roads,you deserve some head damage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90_EF_Si &raquo;</TD></TR><TR><TD CLASS="quote">its prob not good for the valvtrain, but if you are bright enough to be driving that fast on public roads,you deserve some head damage. </TD></TR></TABLE>

some places have no speed limit, I think Montana is like that
and Im sure the autobahn doesnt have a speedlimit either

 

5500 at 100 mph? isnt that kinda high?

 

I know some1 who did 22 hours straight at 100 mph from some place I can't remember the name in US back here in Quebec in an ITR...

Being in VTEC that long is just like having an aggressive cam in an engine and revving that high for that long. In essence, any high rpm drivnig WILL put more wear and tear on the motor than regular driving will...thats a given.

Whether or not the motor will blow up, well...I seriously doubt it!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by efyou &raquo;</TD></TR><TR><TD CLASS="quote">5500 at 100 mph? isnt that kinda high?</TD></TR></TABLE>

Yes it is , I've got the DX final drive in my tranny and around 100 im at around 4500-5000 rpm's. Just my $0.02...................

 

Its like running a car w/ vtec killer cams for a while.
Ive herd no complaints from thoes that use Toda's for weekend driving...


Modified by White91Si at 11:03 PM 6/23/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by White91Si &raquo;</TD></TR><TR><TD CLASS="quote">Its like running a car w/ VTAK killer cams for a while.
Ive herd no complaints that use Toda's for daily driving...</TD></TR></TABLE>

what a tool.

oh, and there is no replacement for volumetric efficiency.

 

Better princess?

 

ahh these cars are ment to be ran 6k and above for long times

 

I'm not saying im going to, i just wanted to get some input. Thanks for all of your varied responses. Good to know theres so many kewl p33pz out there to flap my gums at!

and by the way, my vtec kicks in at 4800

 

Assuming you are not at over around 80% throttle during taht 100MPH cruise, then your vtec will not be engaged. Am I correct here people??

To my knowledge vtec engagement requires a speed over ~25 MPH, &gt;=80% throttle, warm coolant temp, and proper oil pressure.

p.s., Montana got a speed limit around 8 years ago. (i never see more than 1 cop on the interstate when I drive thru Montana for 4 hours though.)

 

100 mph cruise was at 21% tps on my LS so I doubt you would be in vtec the whole time

 

I am stationed in germany (no speed limit in most places on the autobahn), I have a 91 hb with a b16, and when Im running at around 100mph vtec is not enagaged all the time just when I hammer down on the throttle, but my engine runs at about 4500-5500 rpms during this time. kinda high for me, even though the engine is designed to take it. I am thinking of putting in a LS 5th gear when I change the clutch, but that probly wont be for some time. I wouldnt run my car in vtec for long periods of time, you probly shouldnt either. it could mess things up.

 

There is no ill effect of running VTEC for an extended period. VTEC doesn't care and it just basically another follower on the cam.

 

My car sees VTEC nearly everytime I drive it. Still starts and runs fine...

I wouldn't even worry about it, there have been many an indurance race with engines in the 6-7000rpm range and no issues.

enjoy the VTEC...that's what it's there for!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by S-spec &raquo;</TD></TR><TR><TD CLASS="quote">I know some1 who did 22 hours straight at 100 mph from some place I can't remember the name in US back here in Quebec in an ITR...

Being in VTEC that long is just like having an aggressive cam in an engine and revving that high for that long. In essence, any high rpm drivnig WILL put more wear and tear on the motor than regular driving will...thats a given.

Whether or not the motor will blow up, well...I seriously doubt it!</TD></TR></TABLE>

22 hours at 100 mph would be 2,200 miles, nobody has enough gas in their car to drive that far, especialy if you're poppin vtec the whole time. VTEC is not for driving long distance. Plus you'll get better gas milage if you keep it around 60mph.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nexgen91 &raquo;</TD></TR><TR><TD CLASS="quote">I am stationed in germany (no speed limit in most places on the autobahn), I have a 91 hb with a b16, and when Im running at around 100mph vtec is not enagaged all the time just when I hammer down on the throttle, but my engine runs at about 4500-5500 rpms during this time. kinda high for me, even though the engine is designed to take it. I am thinking of putting in a LS 5th gear when I change the clutch, but that probly wont be for some time. I wouldnt run my car in vtec for long periods of time, you probly shouldnt either. it could mess things up.</TD></TR></TABLE>

VTEC isnt throttle sensitive, it's RPM engaged

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ntensehonda &raquo;</TD></TR><TR><TD CLASS="quote">My car sees VTEC nearly everytime I drive it. Still starts and runs fine...

I wouldn't even worry about it, there have been many an indurance race with engines in the 6-7000rpm range and no issues.

enjoy the VTEC...that's what it's there for!</TD></TR></TABLE>

VTEC isnt there for driving 100 for 22 hours straight, VTEC was disigned by honda to offer a fuel efficient car, that also has capabilities of obtaining a higher powerband in high RPM's. Plus the cars that are in Endurance races, dont use VTEC, al VTEC is, is an ADVANCED timing system, meaning when VTEC kicks in, The timing advances about 15 -20 degrees. The endurance race cars are set up with their timing fully advanced so they dont have to wait for VTEC to kick in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by weakazzride &raquo;</TD></TR><TR><TD CLASS="quote">

22 hours at 100 mph would be 2,200 miles, nobody has enough gas in their car to drive that far, especialy if you're poppin vtec the whole time. VTEC is not for driving long distance. Plus you'll get better gas milage if you keep it around 60mph.</TD></TR></TABLE>

VTEC doesn't eat up your MPG.

Combust gasoline with no waste. Use the derived energy as driving power to the greatest possible degree. These are the objectives that every engine design pursues.
For example, the VTEC engine released in 1988 achieved high power output and high fuel economy through the use of two alternate cams mounted on a single camshaftóone for the high-speed range and the other for low- and mid-speed ranges. Honda further improved the VTEC technology, and subsequently in 1999 unveiled the i-VTEC engine as the most advanced VTEC engine. Through technological renovation such as the sophistication of combustion controls by an intelligent system and drastic downsizing (through lighter and more compact design), we combined “higher fuel economy” and “cleaner exhaust gas” with the “joy of driving” in a sophisticated manner. The “ i ” means “intelligent” and by 2005 we intend to upgrade all our engines in various classes to intelligent engines as the “i series.” In 2001, we developed the 1.3 liter i-DS* engine and adopted it in the Fit.

http://world.honda.com/environ....html

VTEC was created to help out on MPG not to rob the car.

VTEC (standing for Variable valve Timing and lift Electronic Control) is a system developed by Honda to improve the combustion efficiency of its internal combustion engines throughout the RPM range. This was the first system of its kind and eventually led to different types of variable valve timing and lift control systems that were later designed by other manufacturers (VVT-i from Toyota, VANOS from BMW, and so on). It was invented by Honda's chief engine designer Kenichi Nagahiro.



At to further the point

SOHC VTEC-E
Honda's next version of VTEC, VTEC-E, was used in a slightly different way; instead of optimising performance at high RPMs, it was used to increase efficiency at low RPMs. At low RPMs, only one of the two intake valves is allowed to open, 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 mixture. A sliding pin, as in the regular VTEC, is used to connect both valves together and allows opening of the second valve.



http://en.wikipedia.org/wiki/VTEC

 

look at your new sig, hmmmmm you say this "kid" comes by.

you are how old? 15.


sorry for the jack. I just cant stand tools that dont belong in the tool box.

Finally, ^^^^toad, someone that pays attention to honda. Thank you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by weakazzride &raquo;</TD></TR><TR><TD CLASS="quote">VTEC isnt throttle sensitive, it's RPM engaged</TD></TR></TABLE>

No. It might be ONLY RPM sensitive on your ECU (I'm guessing its got some weird chip in it), but the way Honda designed it, was to be throttle sensitive as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr_CRX &raquo;</TD></TR><TR><TD CLASS="quote">No. It might be ONLY RPM sensitive on your ECU (I'm guessing its got some weird chip in it), but the way Honda designed it, was to be throttle sensitive as well. </TD></TR></TABLE>