HTEV & Servo

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HTEV & Servo - 4/13/2008 4:54:55 PM    pitbike   Posts: 35 Joined: 8/25/2006 Status: offline Just want to post another in a seemingly long series of posts regarding servo motors and HTEV valves, flapper valves, etc. After getting the '35' code and doing a bunch of research, I disassembled the HTEV valve to get an understanding of how it worked.  Turns out that the HTEV valve was so carboned up, it would not turn unless you physically turned it with a pliers, that had overwhelmed the little plastic gear in the servo motor and stripped it out.  So I turned the HTEV valve to the full open position, removed the cables from that and the servo, then removed the cable that runs the flapper in the air box.  I opened up the air box and completely removed the entire flapper valve assembly (8 screws).  Reset the ECU using the service manual procedure and have very positive results.  The bike breathes better (with the flapper not working correctly, it was 80% blocked all the time) and it exhausts better (with the HTEV to the 90° position, it was 50% blocked, kinda like putting a potato in your tailpipe).  It sounds better/deeper, the RPMS's spin up faster and there is no negative issue, it runs perfect.  The ECU 'learns' and adjusts the fuel mapping to match the new air flow, so I will be getting slightly less mileage, but way worth it.  In the future if I notice any 'seat of the pants'  dead zones in the RPM range, I may opt for a Power Commander, but at this point, this was all free and made my code go away and the motor is free to breathe finally. Post #: 1

RE: HTEV & Servo - 4/13/2008 6:11:12 PM    TK954RR Posts: 3015 Joined: 12/3/2006 From: Green Bay WI Status: offline How does the ecu learn and adjust the fuel mapping? _____________________________ I live life like a dog. If i cant eat it or f*** it, i piss on it and walk away (in reply to pitbike) Post #: 2

RE: HTEV & Servo - 4/13/2008 10:41:46 PM    KidCr3nshaw Posts: 3683 Joined: 10/5/2006 Status: offline Well, thank you sir.  I now know what I am going to do tomorrow.  I've had the same problem, but dammit I'm tired of tearing that bike up and down... Good work, I'll let you know how mine goes! _____________________________ 1996 CBR 600F3 2002 CXR 400RR Supermoto wanna-be ;) (in reply to TK954RR) Post #: 3

RE: HTEV & Servo - 4/13/2008 10:44:23 PM    NY Erion929 Posts: 1527 Joined: 9/29/2006 Status: online I've been debating pulling mine out too..  Dont know if anyone else feels it, but if im jus cruising in a high gear low rpm, when i hit 3k rpm where the valve opens/closes it gets jerky on me.. _____________________________ Ride Like You Want To Ride Tomorrow ''01 929RR - Daily Rider ''03 954RR - StuntFighter ''97 Yamaha Waverunner (in reply to KidCr3nshaw) Post #: 4

RE: HTEV & Servo - 4/13/2008 10:55:35 PM    KidCr3nshaw Posts: 3683 Joined: 10/5/2006 Status: offline Wish I could say for sure, but my problems seem so many that I can't be certain that's the exact cause. My biggest issue, aside from the tranny, is basically the bike won't rev past 10,5K RPM's.  No matter what gear, no gear - nothing. I was thinking that mine just is stucked almost closed or something.  Because isn't there only two positions on it, right?  running, and WOT? I dunno - hope it solves my problem, lol.  Wish I could get my new tank and upper painted and get everything on it man, sucks... _____________________________ 1996 CBR 600F3 2002 CXR 400RR Supermoto wanna-be ;) (in reply to NY Erion929) Post #: 5

RE: HTEV & Servo - 4/14/2008 12:12:45 AM    NY Erion929 Posts: 1527 Joined: 9/29/2006 Status: online _____________________________ Ride Like You Want To Ride Tomorrow ''01 929RR - Daily Rider ''03 954RR - StuntFighter ''97 Yamaha Waverunner (in reply to KidCr3nshaw) Post #: 6

RE: HTEV & Servo - 4/14/2008 5:31:02 AM    sc929 Posts: 143 Joined: 8/21/2007 Status: offline Anyone already done this with a pc3.  I would guess you could use a map for a full exhaust right?  What about a pic of the inside of the exhaust valve.  I seem to remember one posted last year but couldn't find it.  Would it be feasible to gut the thing out, weld up the holes where the shaft goes in.  A makeshift eliminator so to say.  While all thats apart, what about the cone, take it out too?? (in reply to NY Erion929) Post #: 7

RE: HTEV & Servo - 4/14/2008 5:37:00 AM    pitbike   Posts: 35 Joined: 8/25/2006 Status: offline The EPROM chip that is the brain of the ECU, is constantly 'learning' and adjusting for your bike based on air intake/volume/humdity, etc.....that is part of the entire fuel injection package (i.e. we don't need a choke because the ECU automatically does it for us, then knows when to adjust it based on internal engine temps).  It can only adjust so much though, so some folks opt to go to a Power Commander to put the finishing touches on the RPM ranges that are not completely dialed during the manufacture of the ECU. NY Erion929 displayed a great picture of how the exhaust flow works at specific RPM ranges.  Unless you are at full honk, the HTEV valve is partially closed when everything is working the way it is supposed to.  My HTEV would not move at all and was stuck at 90° (50% blockage).  Went for a spin yesterday afternoon and also commuted this morning and the bike is right on the money.   (in reply to TK954RR) Post #: 8

RE: HTEV & Servo - 4/14/2008 5:40:30 AM    pitbike   Posts: 35 Joined: 8/25/2006 Status: offline Leaving the guts in makes a little more sense as it would have a better air flow.  If you took the valve out of the body, it leave a lot of areas for air to bounce around in and you would still have to weld the outside closed.  Just remove the cables and leave the cover and bracket.  The HASS eliminator does all this for you for a price, it reduces weight as well....but for the budget minded, this accomplished the exact same thing. (in reply to sc929) Post #: 9

RE: HTEV & Servo - 4/14/2008 9:59:47 AM    KidCr3nshaw Posts: 3683 Joined: 10/5/2006 Status: offline Yep, I'm guessing that's my exact problem, then. Thanks you two - like I don't have enough to do... _____________________________ 1996 CBR 600F3 2002 CXR 400RR Supermoto wanna-be ;) (in reply to pitbike) Post #: 10

RE: HTEV & Servo - 4/14/2008 3:39:30 PM    bravehart   Posts: 101 Joined: 12/30/2007 Status: offline www.hardracing.com has some info on this as well...............ny erion929 thats a cool diagram, ive never seen that before (in reply to KidCr3nshaw) Post #: 11

RE: HTEV & Servo - 4/14/2008 4:44:56 PM    KidCr3nshaw Posts: 3683 Joined: 10/5/2006 Status: offline Well I've reset the code, but now I'm getting a solid light... getting ready to take a WOT ride and see if there's a difference. Stay tooned... _____________________________ 1996 CBR 600F3 2002 CXR 400RR Supermoto wanna-be ;) (in reply to bravehart) Post #: 12

RE: HTEV & Servo - 4/14/2008 5:14:04 PM    KidCr3nshaw Posts: 3683 Joined: 10/5/2006 Status: offline Well I've successfully killed my low end. The HTEV keeps rotating back to a close position, my guess is I need to prop it open somehow... any ideas? You're leaving it fixed in the wide open position, right? ... I hate this... _____________________________ 1996 CBR 600F3 2002 CXR 400RR Supermoto wanna-be ;) (in reply to KidCr3nshaw) Post #: 13

RE: HTEV & Servo - 4/14/2008 5:52:59 PM    TK954RR Posts: 3015 Joined: 12/3/2006 From: Green Bay WI Status: offline Tack a couple welds in there, that aughta keep it open _____________________________ I live life like a dog. If i cant eat it or f*** it, i piss on it and walk away (in reply to KidCr3nshaw) Post #: 14

RE: HTEV & Servo - 4/14/2008 7:32:53 PM    KidCr3nshaw Posts: 3683 Joined: 10/5/2006 Status: offline How's everyone else keeping it in place... that's what the HASS eliminator does, eh? PITBIKE, how you keeping yours open, or is the build-up so much that it stays open? AND - I've tripped the 35 code again... how can I keep that from tripping without replacing the servo motor - any ideas? grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr _____________________________ 1996 CBR 600F3 2002 CXR 400RR Supermoto wanna-be ;) (in reply to TK954RR) Post #: 15

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