How to disable VTEC kick-in ALLTIME to save gas
Thread Starter
Registered!!
Joined: Apr 2004
Posts: 12
Likes: 0
Rep Power: 0 
How to disable VTEC kick-in ALLTIME to save gas Hi, I am new here , With 7 Gen civic EX AT, I would like to save more gas on freeway driving @ 70 mph @ 2800-2900 RPM, I am not sure is my VTEC enable at this range( Vtec could be on and off at this range), Can I remove the vtec switch, or plug ( where you guys hook up the VTEC light) such that my engine will not kick in vtec all time?? I know I will not gain HP, but what I need is more MPG on high RPM.
Aslo, may be we can tell how VTEC Vs non-VTEC , I am wonder is disabled VTEC as same as LX engine??
Please help ^_^
Aslo, may be we can tell how VTEC Vs non-VTEC , I am wonder is disabled VTEC as same as LX engine??
Please help ^_^
Last edited by smartblue; Apr 18, 2004 at 06:57 PM.
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 813 
You will most likely get a cel. The ecu looks for an vtec signal at certain rpms. Get a vafcII and you can raise the engagement point slightly. From mine, vtec will stay on at 70mph or above. At 65 mph, it stays off.
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 Won't the engine starve like a ****? I mean... the whole point of high lift is to make the low lift low enough to make the low end effecient. Then you make the high lift so enough air gets in to make the car run better at higher RPMs. The low lift is lower than the A1 head, and the high lift is obviously higher.
I drive almost all highway miles... the car gets 39 to the gallon, how much better could you possibly get?
I don't see this doing much more than pissing the engine off.
I drive almost all highway miles... the car gets 39 to the gallon, how much better could you possibly get?
I don't see this doing much more than pissing the engine off.
I had always thought Vtec wasn't only computer but it also has to do with the Cams from when it switches from a low to high cam at a certain RPM. I dont think there is anything you can do to shut it off unless by switching cams or something. I dont' think it would be a good idea to pull that plug BTW.
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 VTEC= Variable Timing Electronic Control. Its the cam lift and timing advance. The computer triggers the solenoid.
I don't know what the parameters are for this car...
XXXX RPM
Oil Pressure at YY PSI
Coolant temp at ZZ deg F
Speed at least Q MPH
If everything is met, the computer engages VTEC.
Since the VTEC in this car is setup to optomize effeciency, I would think you want to just leave it alone.
I don't know what the parameters are for this car...
XXXX RPM
Oil Pressure at YY PSI
Coolant temp at ZZ deg F
Speed at least Q MPH
If everything is met, the computer engages VTEC.
Since the VTEC in this car is setup to optomize effeciency, I would think you want to just leave it alone.
vtec kicks in @ 3200 rpm
some odd reason...when i had a vtec controller ...i set the kick-in point
at 6500 rpm (so i wouldn't use it for testing purposes)
yet....i tested it and it didn't save me much gas at all
some odd reason...when i had a vtec controller ...i set the kick-in point
at 6500 rpm (so i wouldn't use it for testing purposes)
yet....i tested it and it didn't save me much gas at all
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 813 That's a good point. I measured gas mileage twice. Once by driving normal, and a second time flooring it and driving more aggressively. The mpg was around 25 for both tries.
Thread Starter
Registered!!
Joined: Apr 2004
Posts: 12
Likes: 0
Rep Power: 0 Woo, I will NOT **** up my car after all of your great posts here!!. Hmm , my last queston is how the **** Honda clam 38 MPG on freeway, Is all honda mesure mpg @ 60 mpg inside tunnel ?? which at this point vtec is still not change to hi cam yet?? , I am wonder if mesure @ 70 mpg ( I really mean 70MPH ), not sure what will be the new mpg when vtec hi cam is in use??
Again!! Thanks for all of your quick replies!!!
Again!! Thanks for all of your quick replies!!!
Last edited by smartblue; Apr 19, 2004 at 10:56 AM.
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 As people have already explained, VTEC does not waste or save gas. All it does is let more air (higher, longer duration intake lift) in at higher RPMS to keep the engine from getting choked off. Its intended to optomize the use of the engine's power band and effeciency. You'll waste more gas by driving fast than with high vs low lift. Wasting gas is a function of RPM. How many times your injectors have to fire per a given amount of time is what will waste gas. And just use the cruise control. If you're not on the gas, the car goes into some kind of highway mode, it leans the A/F mix out to save gas since all you need to do is keep the car moving and not accelerate. Good ol ULEV at work. Over inflate your tires by 2 or 3 PSI. There are ways to increase gas milage. Fvcking with the computer isn't one of them.
Last edited by Boilermaker1; Apr 18, 2004 at 11:02 PM.
Joined: Jun 2001
Posts: 9,165
Likes: 0
From: Duluth, MN
Rep Power: 395 I got great gas mileage when I bought E-10 gas, the gas with 10% ethanol in it. I got 47 mpg on the freeway, with the truck of my car packed, and the a/c halfway the whole time. Stock Firestones at 32 psi.
Registered!!
Joined: Jul 2003
Posts: 1,030
Likes: 0
From: Los Angeles
Rep Power: 289 Originally posted by smartblue
Woo, I will NOT **** up my car after all of your great posts here!!. Hmm , my last queston is how the **** Honda clam 38 MPG on freeway, Is all honda mesure mpg @ 60 mpg inside tunnel ?? which at this point vtec is still not change to hi cam yet?? , I am wonder if mesure @ 70 mpg, not sure what will be the new mpg when vtec hi cam is in use??
Again!! Thanks for all of your quick replies!!!
Woo, I will NOT **** up my car after all of your great posts here!!. Hmm , my last queston is how the **** Honda clam 38 MPG on freeway, Is all honda mesure mpg @ 60 mpg inside tunnel ?? which at this point vtec is still not change to hi cam yet?? , I am wonder if mesure @ 70 mpg, not sure what will be the new mpg when vtec hi cam is in use??
Again!! Thanks for all of your quick replies!!!
Registered!!
iTrader: (1)
Joined: Apr 2003
Posts: 1,165
Likes: 0
From: Orange County, CA
Rep Power: 0 i average about 32-34 mpg doing daily city driving and about 35-37 mpg on the freeway. i think this is amazing mpg!
well, my previous car was a mustang gt where i'd average 15 mpg in the city and 18 mpg on the freeway.
half the horsepower
double the gas mileage 
well, my previous car was a mustang gt where i'd average 15 mpg in the city and 18 mpg on the freeway.
half the horsepower
double the gas mileage 
' 
Originally posted by smartblue
Woo, I will NOT **** up my car after all of your great posts here!!. Hmm , my last queston is how the **** Honda clam 38 MPG on freeway, Is all honda mesure mpg @ 60 mpg inside tunnel ?? which at this point vtec is still not change to hi cam yet?? , I am wonder if mesure @ 70 mpg, not sure what will be the new mpg when vtec hi cam is in use??
Again!! Thanks for all of your quick replies!!!
Woo, I will NOT **** up my car after all of your great posts here!!. Hmm , my last queston is how the **** Honda clam 38 MPG on freeway, Is all honda mesure mpg @ 60 mpg inside tunnel ?? which at this point vtec is still not change to hi cam yet?? , I am wonder if mesure @ 70 mpg, not sure what will be the new mpg when vtec hi cam is in use??
Again!! Thanks for all of your quick replies!!!
At the end I avg 28-29 city and 42-44 highway =) with my LX 5 speeds. I think you guys should check for any oil leak and should get valve gasket replace when you do the valve adjustment.
Last edited by dacivic; Apr 19, 2004 at 09:33 AM.
Nothing works better than a Chris except a Honda.
Joined: May 2002
Posts: 5,346
Likes: 0
From: Baltimore, MD
Rep Power: 348 Don't rev the engine up and you can hit 70mph w/o going into VTEC mode. I've done it before, I've slowly accelerated from 60 and it saves some gas. Flooring it however from say 40 all the way up to 70 is a huge waste of gas... Like they said, avoid accelerations and stay a constant speed and you should be good on gas.
Registered!!
Joined: Jun 2003
Posts: 281
Likes: 0
From: Ft. Worth, Texas
Rep Power: 0 Its not punching everytime I am at a stoplight that kills my gas, its driving like 80 on the highway. If I drive 65 or 60 (speed limits here) then I get about 35, because most of my driving highway. If I drive 80 or so, it gets cut down alot.
Joined: Sep 2002
Posts: 51,241
Likes: 20
From: NV
Rep Power: 813 It turns on anywhere from 2800-3000 rpms. I don't know exactly. It's always different depending on how you drive. All I know is the last time I drove 65mph with 99% highway miles, I ended up getting only 30mpg. That's with cruise on the whole time and no A/C. My car is messed up.
Registered!!
Joined: Jul 2003
Posts: 1,030
Likes: 0
From: Los Angeles
Rep Power: 289 Originally posted by gearbox
It turns on anywhere from 2800-3000 rpms. I don't know exactly. It's always different depending on how you drive. All I know is the last time I drove 65mph with 99% highway miles, I ended up getting only 30mpg. That's with cruise on the whole time and no A/C. My car is messed up.
It turns on anywhere from 2800-3000 rpms. I don't know exactly. It's always different depending on how you drive. All I know is the last time I drove 65mph with 99% highway miles, I ended up getting only 30mpg. That's with cruise on the whole time and no A/C. My car is messed up.
