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When VTEC cuts in does the car add any additional fuel? eg, over fuel

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    #1

    When VTEC cuts in does the car add any additional fuel? eg, over fuel

    Im arguing with my mate he believes when vtec cuts in my car is over fueling which is why a bit more smoke comes out when in vtec and also when i leave him for dead

    Sent from my GT-I9100 using Tapatalk
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    #2
    Could be. On full throttle the car will run more rich.. Also it may be burning oil at higher revs"higher oil pressure".
    sigpic
    128.8kw Atws @ 1065kg - 13.875 sec @ 100.26 mph http://forum.clubitr.com.au/showthre...ion&highlight=

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      #3
      I wouldn't call it over fuelling but it definitely gets richer when the cam profile changes (VTEC).

      Quote:
      Originally Posted by justinfox
      You can modify many crappy cars out there to be faster than a real Type-R but no matter how fast they are they still don't knock the Type-R off it's "pedestal" which it so deservedly sits on. :P

      JHDM-B18C7 >>>>> Source Code: DC2R 00-0016 SOLD


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        #4
        maybe tell us the colour of the smoke?

        moved to general automotive.
        ... retired/

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          #5
          Its a blacker smoke he recons .but it is using more fuel in vtec then if it wasnt ??

          Sent from my GT-I9100 using Tapatalk

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            #6
            of course it is using more fuel in vtec then if it wasnt!

            but it sounds like your ecu is squirting MORE fuel than is 'actually' required.

            i.e. your EFI system is not working properly...
            ... retired/

            Comment

              #7
              What car does the OP own? Could be one that burns more oil then another.

              Also what fuel and oil combo are you using?

              Quote:
              Originally Posted by justinfox
              You can modify many crappy cars out there to be faster than a real Type-R but no matter how fast they are they still don't knock the Type-R off it's "pedestal" which it so deservedly sits on. :P

              JHDM-B18C7 >>>>> Source Code: DC2R 00-0016 SOLD


              Comment

                #8
                I use 98 ultimate with a thinner oil

                Sent from my GT-I9100 using Tapatalk

                Comment

                  #9
                  Originally posted by JUST VTEC View Post
                  I use 98 ultimate with a thinner oil

                  Sent from my GT-I9100 using Tapatalk
                  DC5S hey. Take it to honda for diagnosis, they're the best.
                  Last edited by DC2R; 08-05-12, 05:53 AM.

                  Quote:
                  Originally Posted by justinfox
                  You can modify many crappy cars out there to be faster than a real Type-R but no matter how fast they are they still don't knock the Type-R off it's "pedestal" which it so deservedly sits on. :P

                  JHDM-B18C7 >>>>> Source Code: DC2R 00-0016 SOLD


                  Comment

                    #10
                    basic rules of combustion: cylinder firing = air+fuel+spark

                    Want more power? add more air. VTEC changes the profile and duration of the camshafts, thereby opening valves for longer and wider, this allows more air to enter the combustion chamber. The ECU to compensate has to add more fuel.

                    Just like turbocharging, when adding air via boost, you must add more fuel to keep AFR (air fuel ratio's) safe.
                    Last edited by cordz; 08-05-12, 11:07 AM.
                    Honda Nationals, September 9-10, get amongst it!

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