+ Reply to Thread
Page 1 of 2
1 2 LastLast
Results 1 to 30 of 49

Thread: VFR VTEC 2008 - Throttle issue! (another one)

  1. #1
    Junior Member
    Join Date
    Jan 2009
    Location
    Auckland, New Zealand
    Country
    My Ride
    2008 VFR 800
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    VFR VTEC 2008 - Throttle issue! (another one)

    I've had my VTEC 2008 for 2 months. 2nd owner. It's done 2000 km's and I'm loving it. I know a lot has been written about surging and snatchy throttle and I wonder if that's the same as what I'm experiencing. At lowish revs 2000-4000 rpms and with a constant throttle position the bike starts to surge and lag. My usual response is to change gear or change throttle and the problem goes away. Other than that the throttle is a little snatchy at low revs and low speed but I'm getting used to that. Does this sound like the typical problem with this bike or something different? I'm thinking of taking it back to the shop to get it looked at. What should I ask them to check?


  2. #2
    Uber Guru CandyRedRC46's Avatar
    Join Date
    Feb 2009
    Location
    Key West Florida
    Country
    My Ride
    2007 Honda VFR800 .... 1993 CB750 NightHawk
    View my
    Photo Gallery
    Posts
    1,062
    Thanks
    153
    Thanked 76 Times in 57 Posts

    330 ohm resistors

    yep this is what to expect from your bike in stock form. this is why o2 eliminators and power commanders exist...

    i know how you feel. coming from a 15 year old carborated bike onto a 11 thousand dollar machine my expectations were high. i was disappointed to say the least.

    that's why i went to radio shack and picked up a pack of 330 ohm 1/4 watt resistors.
    unplug your o2 sensors and plug in the resistors. it runs beautifully now. it is very straight forward and easily done there are many treads on this already.

    PS who ever said that this has no point with out a power commander or 98-99 headers was mistaken. i have neither YET, and my bike feels buttery smooth now. the throttle no longer feels like an on off switch :)
    Attached Images

  3. The Following User Says Thank You to CandyRedRC46 For This Useful Post:

    JBzRed07 (03-19-2009)

  4. #3
    Senior Member Comicus's Avatar
    Join Date
    Jun 2008
    Location
    Lascassas, TN
    Country
    My Ride
    '04 VFR800/'03 RC51
    Posts
    326
    Thanks
    30
    Thanked 24 Times in 16 Posts
    That's exactly how my 04 was but since i did the o2 eliminator and the power commander it's a totally different bike. Soooo smooth now!
    Sometimes, there just aren't enough rocks- Ghandi

  5. #4
    Member- VFR Brotherhood

    John451's Avatar
    Join Date
    May 2004
    Location
    Sydneys South, 8 minutes from the RNP
    Country
    My Ride
    '99
    View my
    Photo Gallery
    Posts
    1,563
    Thanks
    41
    Thanked 80 Times in 59 Posts
    Quote Originally Posted by dazza139 View Post
    I've had my VTEC 2008 for 2 months.... At lowish revs 2000-4000 rpms and with a constant throttle position the bike starts to surge and lag.
    Remember the V4 800 has a 12k Redline and doesn't like being below 4k especially cruising in the top 3 gears so use 4k as your minimum.

  6. #5
    Member VifferDude's Avatar
    Join Date
    Jun 2008
    Location
    Sydney Australia
    Country
    My Ride
    VFR 800 '08
    Posts
    71
    Thanks
    1
    Thanked 3 Times in 3 Posts
    My bike ('08) Wouldn't run to well below 5000rpm for the first 10000klm because the engine was still tight. It'll pull away from 3000rpm now. But as John 451 said, this is a high reving bike. Go for a lower gear. The Viffer isn't a 2 wheeled tractor with a lumpy V twin like the Harleys

  7. #6
    Senior Member

    vfrchick's Avatar
    Join Date
    Aug 2008
    Location
    Las Vegas
    Country
    My Ride
    2007 VFR
    View my
    Photo Gallery
    Posts
    322
    Thanks
    9
    Thanked 17 Times in 14 Posts
    Yup... same thing on my 2007. I got a PC a while ago, and just putting that on helped "some". Finally this past Monday I did the O2 eliminators and actually had it dynotuned so have a custom map. Sooooooooooooo unbelievably smooth now, I can't believe it's the same bike. Do it, it's worth it!
    Charter Member Chat Hooers Union, Local 151

    There are no ordinary moments-- Dan Millman

    At that moment, when you accept the fact that there is no fixed reality, no hard and fast set of rules that need to be followed, no limits or borders, you are making the choice to be free --Garri Garripoli

  8. #7
    Member Got_Wings?'s Avatar
    Join Date
    Feb 2009
    Location
    PHX
    Country
    My Ride
    2003 Honda VFR800A
    Posts
    31
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by CandyRedRC46 View Post
    yep this is what to expect from your bike in stock form. this is why o2 eliminators and power commanders exist...

    i know how you feel. coming from a 15 year old carborated bike onto a 11 thousand dollar machine my expectations were high. i was disappointed to say the least.

    that's why i went to radio shack and picked up a pack of 330 ohm 1/4 watt resistors.
    unplug your o2 sensors and plug in the resistors. it runs beautifully now. it is very straight forward and easily done there are many treads on this already.

    PS who ever said that this has no point with out a power commander or 98-99 headers was mistaken. i have neither YET, and my bike feels buttery smooth now. the throttle no longer feels like an on off switch :)
    SOO interesting to log on and see this...I just came back from a quick ride on my newly aquired stock 03 VFR800A and the SAME exact issue is driving me nuts!

    So, we've got the cheap, quick fix in the resistors....and we have the 02 eliminators + PC (w/possible dyno tuning). Hmmmm.....is the cheap n quick fix too good to be true? I'm willing to try if there are no harmful side effects. I'll be putting on a Remus exhaust this weekend so all my spare cash is now gone (read: PC is out for a while if that's the best solution)

    CandyRed?

  9. #8
    Junior Member
    Join Date
    Jan 2009
    Location
    Auckland, New Zealand
    Country
    My Ride
    2008 VFR 800
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Can I have the idiot's guide to finding the O2 sensor plugs? I'm definitely prepared to do this but I'm not a motorcycle mechanic

  10. #9
    Senior Member HondaTech's Avatar
    Join Date
    Dec 2008
    Location
    Salem, OR
    Country
    My Ride
    2007 Honda VFR Interceptor ABS- 25th Anniversary
    Posts
    234
    Thanks
    3
    Thanked 9 Times in 8 Posts
    well the O2 sensors are really the only things with wires attached sticking out of the exhaust so that ought to narrow it down...personally I think the engineers know more about how that bike should run for the best combination of power, economy and emissions than I do so I'll be leaving mine alone and stick to using it as it was intended- want to go faster? shift down and use the engines operating range instead of asking an engine designed to make HP from 6k and up to do it at 3k. If you want it to pull like a train down low, buy a Bimmer with a boxer motor.

    Proud Member - Sixth Gen Militia - 1st VTEC Batallion

  11. #10
    Junior Member
    Join Date
    Jan 2009
    Location
    Auckland, New Zealand
    Country
    My Ride
    2008 VFR 800
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by HondaTech View Post
    well the O2 sensors are really the only things with wires attached sticking out of the exhaust so that ought to narrow it down...personally I think the engineers know more about how that bike should run for the best combination of power, economy and emissions than I do so I'll be leaving mine alone and stick to using it as it was intended- want to go faster? shift down and use the engines operating range instead of asking an engine designed to make HP from 6k and up to do it at 3k. If you want it to pull like a train down low, buy a Bimmer with a boxer motor.
    Thanks. Yes I have taken on board your comments about revs and I probably have been letting the bike rev too low. Do you think that this is not a problem at higher revs. The issue for me seems to be constant throttle which causes the problem. I will have to see if its noticeable higer up in the rev range.

  12. #11
    short fused

    crustyrider's Avatar
    Join Date
    Jul 2008
    Location
    Santa Barbara CA
    Country
    My Ride
    1986 Honda Interceptor VFR700F2
    View my
    Photo Gallery
    Posts
    2,173
    Thanks
    133
    Thanked 170 Times in 131 Posts
    bro, when you kick it in, at 6500 your gonna need air breaks to stop you from shooting off the pier at the other end of the island............
    charter member: Chat Hooers Union, Local 151

    http://www.tricountymotorcycles.com/

    " the return of the mullet will be the rebirth of our nation" TOECUTTER

    "I'm the guy that keeps Mr.Dead in his back pocket" Max
    why is it if you have gas and take a poop the gas goes away, but you don't see bubbles percolating from the sinker in the bowl?" TinkerinWstuff

    " my gun is a little bit overkill ( maybe to make up for my small penis )" Cundalini

  13. #12
    Senior Member Comicus's Avatar
    Join Date
    Jun 2008
    Location
    Lascassas, TN
    Country
    My Ride
    '04 VFR800/'03 RC51
    Posts
    326
    Thanks
    30
    Thanked 24 Times in 16 Posts
    Quote Originally Posted by dazza139 View Post
    Can I have the idiot's guide to finding the O2 sensor plugs? I'm definitely prepared to do this but I'm not a motorcycle mechanic
    I don't run the bike below 4k but the o2 eliminator plus power commander smooths the bike through out the power curve. It goes from running like a honda to running like a finely tuned honda. It's an on going debate here but I think the PCIII is worth the money.

    As for the o2 sensors...you have to remove the left faring and about mid way down you'll see a plastic cover protecting 3 wire connectors. two of the connectors are the o2 sensors just follow the wires back to your exhaust(not very far about 5-8 inches). And I didn't know this until I was doing the o2 eliminator mod but there are 2 o2 sensors.
    Sometimes, there just aren't enough rocks- Ghandi

  14. #13
    Uber Guru CandyRedRC46's Avatar
    Join Date
    Feb 2009
    Location
    Key West Florida
    Country
    My Ride
    2007 Honda VFR800 .... 1993 CB750 NightHawk
    View my
    Photo Gallery
    Posts
    1,062
    Thanks
    153
    Thanked 76 Times in 57 Posts
    As far as Honda knowing what they're doing in engineering this motor... Yeah they did know what they were doing when they originally designed this motor. Early VFR's did not have o2 sensors. o2 sensors were an after thought. Vtec was an after thought as well. These are things that the original VFR800 motor was not designed to have. Honda prides itself in being one of the cleanest manufactures in the world. These two things Honda did were done to meet ever tightening CARB emissions. I appreciate that Honda does this, I just don't like it on MY bike...

    Any ways about the long run I'm hoping that these little 99 cent resistors will last, but the theory is that they're exactly the same this that's inside the 20 dollar Dyno Jet o2 eliminators... Time will tell. Hopefully I never get a FI warning light, but then again it would only be as simple as replacing them. At 5 for 99 cents you could do this 50 times and it would run you the same as Dyno Jet's two O2 Eliminators.

  15. #14
    Member Got_Wings?'s Avatar
    Join Date
    Feb 2009
    Location
    PHX
    Country
    My Ride
    2003 Honda VFR800A
    Posts
    31
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Yet another pertinent question....will the bike pass emissions with the following mods:

    1) The resistors
    2) The 02 eliminators
    3) The 02 eliminators and the PC

    (I'm in AZ, for reference)

  16. #15
    Member indyvfr's Avatar
    Join Date
    Jun 2007
    Location
    Indianapolis, Indiana
    Country
    My Ride
    '07 RWB VFR800
    Posts
    40
    Thanks
    0
    Thanked 4 Times in 4 Posts
    +1 on the PCIII and O2 sensor eliminators. I ride an '07 and have 15,000 miles on it. It's been a great bike, but the throttle always seemed twitchy down low and on/off throttle. I installed the PCIII and O2 sensor eliminators and the bike is unbelievable smooth. It's runs the way I wanted it to from the beginning. I am running a K&N filter with stock exhaust, with the Dynojet "stock exhaust" map. It has noticeably more throttle response and overall has more punch to it. I would also say it's well worth the money IMO.

  17. #16
    Uber Guru CandyRedRC46's Avatar
    Join Date
    Feb 2009
    Location
    Key West Florida
    Country
    My Ride
    2007 Honda VFR800 .... 1993 CB750 NightHawk
    View my
    Photo Gallery
    Posts
    1,062
    Thanks
    153
    Thanked 76 Times in 57 Posts
    Quote Originally Posted by Got_Wings? View Post
    Yet another pertinent question....will the bike pass emissions with the following mods:

    1) The resistors
    2) The 02 eliminators
    3) The 02 eliminators and the PC

    (I'm in AZ, for reference)
    As long as you still have the catalytic convert in, I'm thinking emissions will not be a problem. especially with a good map. I "THINK" passing emissions on this bike would only be a problem WITH OUT a cat. Also in case you misunderstood, resistors and o2 eliminators are the same thing. My apologies if you already knew this.

  18. The Following User Says Thank You to CandyRedRC46 For This Useful Post:

    Got_Wings? (03-20-2009)

  19. #17
    Senior Member HondaTech's Avatar
    Join Date
    Dec 2008
    Location
    Salem, OR
    Country
    My Ride
    2007 Honda VFR Interceptor ABS- 25th Anniversary
    Posts
    234
    Thanks
    3
    Thanked 9 Times in 8 Posts
    Quote Originally Posted by CandyRedRC46 View Post
    As far as Honda knowing what they're doing in engineering this motor... Yeah they did know what they were doing when they originally designed this motor. Early VFR's did not have o2 sensors. o2 sensors were an after thought. Vtec was an after thought as well. These are things that the original VFR800 motor was not designed to have.
    Early ones were not designed with fuel injection so there wasn't any need for oxygen sensors- that's why they don't have them. I don't buy that VTEC was an afterthought either- it's been in the cars since around 1989 and is a great way of basically building a motor with 2 camshafts, 1 for better torque down low and 1 for better HP up high. Yamaha is after the same types of results with the variable length intake runners. No the original motor wasn't designed with these things because they either hadn't been invented yet or weren't cost practical to put into that motor. What percentage of bikes 10 years ago were fuel injected? not many. Does that mean any engine that has evolved into a fuel injected motor that began as one designed around a carburetor is inferior because it wasn't originally designed as one for FI? Look, if people want to mod their bikes I really don't care. If people don't like FI and think the carb motors are superior, fine- If you don't want VTEC fine. Personally I like technology, but more importantly I like things to work as they should, reliably, and I think Honda spends a lot of money to engineer product to perform a specific way. If you like your bike more after you mod it, cool for you- it's not for me. I just can't buy into new technology being applied to a basic engine design to improve it's performance as "an afterthought"

    Proud Member - Sixth Gen Militia - 1st VTEC Batallion

  20. #18
    Senior Member Y2Kviffer's Avatar
    Join Date
    May 2008
    Location
    NC
    Country
    My Ride
    '00 RC46 VFR Interceptor
    View my
    Photo Gallery
    Posts
    531
    Thanks
    46
    Thanked 46 Times in 38 Posts
    Quote Originally Posted by vfrchick View Post
    Yup... same thing on my 2007. I got a PC a while ago, and just putting that on helped "some". Finally this past Monday I did the O2 eliminators and actually had it dynotuned so have a custom map. Sooooooooooooo unbelievably smooth now, I can't believe it's the same bike. Do it, it's worth it!
    Did you get a dyno print out you can scan and post?
    '00 Interceptor
    Sargent seat - HeliBars - Yoshi pipe - ZG ST - K&N

  21. #19
    Uber Guru CandyRedRC46's Avatar
    Join Date
    Feb 2009
    Location
    Key West Florida
    Country
    My Ride
    2007 Honda VFR800 .... 1993 CB750 NightHawk
    View my
    Photo Gallery
    Posts
    1,062
    Thanks
    153
    Thanked 76 Times in 57 Posts
    Do the 98-99's have fuel injection? I'm pretty sure that they do not have o2 sensors or a cat. We are talking about the original VFR"800" motor aren't we? The motor that is based on the RC45... Not the VFR"750".

  22. #20
    gun totin' bastage

    300shooter's Avatar
    Join Date
    Oct 2007
    Location
    armpit of ontario (Windsor)
    Country
    My Ride
    2003 vfr 2007 RWB
    Posts
    385
    Thanks
    29
    Thanked 19 Times in 17 Posts
    Don't forget to mod the PAIR valve.

    " Hey, if I can touch 'em, they're not fake"

    2007 RWB- K&N, Throttlemiester,PAIR Valve mod, Scorpion cans,Pazzo levers,Custom fender elim.,Speedo healer,Sargent seat,F2P,Rod's risers,lowered 3/4",ZG, Minor farkles.

  23. #21
    Uber Guru CandyRedRC46's Avatar
    Join Date
    Feb 2009
    Location
    Key West Florida
    Country
    My Ride
    2007 Honda VFR800 .... 1993 CB750 NightHawk
    View my
    Photo Gallery
    Posts
    1,062
    Thanks
    153
    Thanked 76 Times in 57 Posts
    yeah i heard the pair valve removal is a necessity for accurate air fuel ratio readings. Definitely needs to be done before dynoing. But, I think with the o2's deleted, disabling the pair valve isn't going to do anything drivability wise. As there are not any sensors to pick up that extra oxygen in the exhaust.

  24. #22
    Member- VFR Brotherhood

    John451's Avatar
    Join Date
    May 2004
    Location
    Sydneys South, 8 minutes from the RNP
    Country
    My Ride
    '99
    View my
    Photo Gallery
    Posts
    1,563
    Thanks
    41
    Thanked 80 Times in 59 Posts
    Quote Originally Posted by CandyRedRC46 View Post
    Do the 98-99's have fuel injection? I'm pretty sure that they do not have o2 sensors or a cat.... The motor that is based on the RC45...
    Right on all counts, the Gen 5 Mk1 is catless and has no O2 sensors and was also based on the WSB RC45 engine which also had fuel injection.

    What is interesting is going from a '03 build Gen 6 to the '99 Gen 5 in '05 I have found the Gen 5 throttle is much smoother and even though I still run above 4k from choice. Also unlike my previous Gen 6 the Gen 5 has no problems or stumbling cruising around from 3k mind that may also partly be do to change to a VFR trained mechanic who syncs my SV's every service.

    Like others say know Gen 6 owners who have dialed out their throttle issues with PC3 O2 sensors removed and a custom map.

  25. #23
    Junior Member
    Join Date
    Jul 2008
    Location
    Greenville, SC
    Country
    My Ride
    2005 Light Silver Metallic VFR800
    Posts
    10
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by CandyRedRC46 View Post
    that's why i went to radio shack and picked up a pack of 330 ohm 1/4 watt resistors.
    PS who ever said that this has no point with out a power commander or 98-99 headers was mistaken. i have neither YET, and my bike feels buttery smooth now. the throttle no longer feels like an on off switch :)
    I just did it this morning and it's amazing what a difference it makes. Making U turns is so easy now that I don't have to feather the throttle just to keep the bike from bucking. Man, I wish I'dve had it like this when I took my license test.

  26. #24
    Member carlgustav's Avatar
    Join Date
    Jan 2008
    Country
    View my
    Photo Gallery
    Posts
    78
    Thanks
    1
    Thanked 2 Times in 2 Posts
    FWIW, I did only the PAIR valve 'mod' to my '07 and that alone smoothed out the throttle response a bit, and the VTEC xsition considerably ...
    Guns don't kill people, drivers with Cellphones do; author unknown
    1st ride - '67 650 BSA Thunderbolt, replaced by ...
    2nd - '75 850 Norton Interstate, replaced by ...
    3rd - '76 750 Benelli Sei, replaced by ...
    4th - '76 850 Moto Guzzi T3, replaced by ...
    5th - '84 VF700F, still with me
    6th - '07 VFR, my tourer
    7th - '02 Aprilia RSV1000, track/hooligan

  27. #25
    Senior Member bluespecv03's Avatar
    Join Date
    Oct 2008
    Location
    Daytona Beach, FL
    Country
    My Ride
    2005 Honda Interceptor VFR800
    View my
    Photo Gallery
    Posts
    127
    Thanks
    0
    Thanked 8 Times in 8 Posts
    Is there an advantage to using resistors to eliminate the o2 sensors, while not having a PCiii?
    Chris Jones
    2005 Honda Interceptor VFR800

  28. #26
    Senior Member bluespecv03's Avatar
    Join Date
    Oct 2008
    Location
    Daytona Beach, FL
    Country
    My Ride
    2005 Honda Interceptor VFR800
    View my
    Photo Gallery
    Posts
    127
    Thanks
    0
    Thanked 8 Times in 8 Posts
    Well I decided to do the mod this morning anyway, and wow, its so smooth now!
    Chris Jones
    2005 Honda Interceptor VFR800

  29. #27
    Senior Member

    ewryly's Avatar
    Join Date
    Mar 2008
    Location
    Springfield, MA
    Country
    My Ride
    2007 VFR 800
    View my
    Photo Gallery
    Posts
    423
    Thanks
    44
    Thanked 33 Times in 29 Posts
    I rarely run my bike, an 07, under 4000, and I find it very smooth. It took me a while to get use to keeping the rpms after I made the switch from my cruiser to the vfr, but now it is second nature. That's not to say that pc mods wouldn't make it even smoother, but I would get in the habit of keeping it closer to 5000 at the low end and see how it behaves.
    Ed

    2007 VFR: Helibars, Sargent Seat, Zero Gravity ST Screen, Pilot Road 2s

  30. #28
    Senior Member bluespecv03's Avatar
    Join Date
    Oct 2008
    Location
    Daytona Beach, FL
    Country
    My Ride
    2005 Honda Interceptor VFR800
    View my
    Photo Gallery
    Posts
    127
    Thanks
    0
    Thanked 8 Times in 8 Posts
    I usually keep it above 4k, but the 99cent resistors have definetly made a difference. Its like the bike finally has what its been missing.
    Chris Jones
    2005 Honda Interceptor VFR800

  31. #29
    Uber Guru CandyRedRC46's Avatar
    Join Date
    Feb 2009
    Location
    Key West Florida
    Country
    My Ride
    2007 Honda VFR800 .... 1993 CB750 NightHawk
    View my
    Photo Gallery
    Posts
    1,062
    Thanks
    153
    Thanked 76 Times in 57 Posts
    Quote Originally Posted by bluespecv03 View Post
    Well I decided to do the mod this morning anyway, and wow, its so smooth now!
    you keep track of your milage right? it will be interesting to see how its affected with the o2s eliminated. extra fuel injected at steady throttle vs. being able to run the bike at lower rpms.

    i have seen that the harley guys do this to most of their bikes as a cure for overheating, bad fueling, etc. but they complain of bad gas milage afterwards. i guess getting 30ish mpg sucks when your no faster than your average fart can civic lol.

  32. #30
    Senior Member bluespecv03's Avatar
    Join Date
    Oct 2008
    Location
    Daytona Beach, FL
    Country
    My Ride
    2005 Honda Interceptor VFR800
    View my
    Photo Gallery
    Posts
    127
    Thanks
    0
    Thanked 8 Times in 8 Posts
    Yeah I keep track of my mileage. Ill keep you posted on if there is a drop or not.

    Chris Jones
    2005 Honda Interceptor VFR800

+ Reply to Thread
Page 1 of 2
1 2 LastLast

Similar Threads

  1. New to VFR and have throttle/VTEC Issue
    By donkovac in forum 6th Generation 2002-2009
    Replies: 16
    Last Post: 08-19-2009, 09:19 AM
  2. Throttle Issue
    By tabranham in forum Mechanics Garage
    Replies: 8
    Last Post: 04-02-2009, 09:40 PM
  3. 2008 Vfr Vtec Dog!
    By MiddleAgeCrazy in forum General VFR Discussions
    Replies: 31
    Last Post: 01-26-2009, 11:08 PM
  4. How to fix the 'snatch' jerkness throttle response of VFR's VTEC
    By Marcosdm in forum 6th Generation 2002-2009
    Replies: 7
    Last Post: 03-30-2007, 06:29 PM
  5. VTEC and choking issue - not any more :-)
    By bjarte in forum Suggestion Box
    Replies: 0
    Last Post: 07-25-2006, 04:09 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Search Engine Friendly URLs by vBSEO 3.5.0 RC1 PL1