Lloydz BLOG
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Decel Backfiring and Tip in Back fire & Stalling.| 8/19/2008 6:44:25 PM | |
I have some understaood and unexplained issues with backfiring and stalling going on with Vision.
We'll first start with the Backfiring issue.
Some people dont understand that there are 2 different issues of backfiring both caused from a different situation but always while shifting or decel.
The first is a Decel backfire, caused by a backfire when you instantly roll off the throttle and sometimes continuing as rev's decrease. This condition is "MOST" of the times a cause of a lean condition. an exhaust leak or intake leak can also be blamed or influence the backfire.
MY term Decel is this.
When you shut the throttle off at any given rpm and DONT touch it again. This is decel.
If a backfire occurs at that time it would be a decel pop or backfire.
Now there is another backfire that occurs and it's called a "Tip In" backfire. it's Totally different then decel backfire and at this Piont WE can NOT control it. a tip in back fire occurs as just that, when you just start to tip or open the throttle.
Function of both is as follows.
When you let off the throttle the injectors totally shut fuel off to the injector, this fuel Does not come back on until 1500 rpm's or until you open the throttle again. Decel pop code on my VFC lll units add a certain amount of fuel back at the injector to control a lean backfire from instant fuel shut off. this fuel code is a hard code to program and requires exact timing to produce good results. If you have a VFC lll fuel controller you can see this by watching the lights on the unit, when there is NO injector signal the green and red lights will alternate flash, green on 1 and red on 8. On the dyno if I make a full throttle run and let off the grip the Green and Red lights will blink informing you that the injectors are off, when the rpm reaches 1500 they turn back on and resume in green mode, when decel pop code is used the timing of this fuel is ULTRA critical and for the most part is used while the injectors are in the off state. If there is still a backfire when cranking up the fuel to higher levels on decel then the problem that makes the backfire is NOT fuel related. I repeat! If you have to add alot of fuel to a backfire and it doesn't control it then the backfire is NOT a fuel related issue! There is another problem that I feel causes backfiring with the 08-09 bikes that is not fuel related, I have my thoughts but will dive into this further in the next few weeks. LOOK FOR THE OUT COME.
Tip in, Short and sweet, it adds a shot of fuel when it see's an increase of throttle voltage. Some other weird stuff happens at that time and until I have the exact operation of all the involved componets I'll leave both of us guessing for now.
Correction to most if not all backfiring if it's related to fueling while using a VFC.
Add the correct amount of fuel in the Blue/Green mode and
STOP BEING THROTTLE JOCKEY'S !. I know were all guilty of it, wacking the throttle under decel and down shifting. it sounds cool and we are just use to doing it.
As a quick note, if you expereince some stalling after a VFC install lower the green fuel until it regains constant running. also be awre of not THROTTLE jocking as this will add to the stalling effect. I will be working on a program to help if not cure this issue if the issue is related to fueling once again. There is I beleive another result of a stalling bike as even bikes without VFC's Stall. another issue that will be looked at and not related to the bracket recall.
AVR rocked with all the Visions out there.
I really enjoy running them on the dyno, much quieter and more comfy then some of the other bikes. when you spend 10-12 hours a day in the saddles it nice to have them comfy.
Lloyd
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| AVR coming up| 8/7/2008 6:08:27 AM | |
Just as ussual we're stressing around here trying to get bikes done and all the crap we need to bring to an event.
I've neglected e-mails and phone calls and have even blown off Jeff (JAM) for a week now, only cause I know I have at least 40 + hours of driving with him. (are you laughing yet buddy?)
I was just looking at the schedule and MAN! I've got some Visions to dyno, Maybe I'll actually get a Vision with a set of Ness honkers on it to try. One of the things I was wrong about when Vision came out was that I thought most of the consumers who were going to purchase them were going to be "Winger" based people, you know who I'm talking about guys.LOL
But instead most of you are all ADDICTS just like the rest of the Victory / Harley guys out there. By that I mean most of you still want more and dont care about diving into the motor if needed to get it. If you look at the other brands out there they are limited to the amount of upgrades that can be done to the motor. Vision is right now but that will change.
Who would have ever though that you'd see a bunch of "High Tech" Looking touring bikes gathered around a dyno
for a check up? Does that mean that times are changing? Are we going to see sport bike guys wearing half or no helmets and full leather Jackets and chaps when the "Harley"- "Cruiser" guys wear full face lids with tank tops, shorts and sneakers? It all seems totally backwards. But hey what the heck enjoy it and I'll be seeing alot of you at the rally,
Ride safe!
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| VFC's lights not working| 7/23/2008 6:44:17 AM | |
There were some units sent out that upon installation were thought to be defective with the units not lighting up when powered. This has been caught and rectified. The face plate label (label with my logo) was installed upside down, this would block off the lights from being seen and also block the buttons for usage. It always seems to be the simple things that get us.
We apoligize for those who had to beat there hands up twice on the install.
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| R&Ding Update| 7/16/2008 6:18:31 PM | |
Doing alittle R&Ding with motor combo's for the new Vision, We've seen 110hp and 117 ft lbs of torque and were achiving 40-44 MPG. Traveling speeds are in excess of 75mph for these figures of fuel economy and were pushing to get that higher (well keep our fingers crossed). We'll have more data as the next few weeks pass and we'll keep you posted.
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| 10 Years Of Progress| 6/28/2008 10:47:45 AM | |
Heres an quick view of some STOCK bikes through out the years of change.
Blues lines are a 99 V92C (92 Inch)
Red lines are a 2001 V92C (92 Inch)
Black Lines are a 2003 TC (92 Inch)
Orange Lines are a 100/6 KP (100 Inch)
Maroon Lines are a 2008 Vision (106 Inch)
These are random runs pulled from my database, There maybe some that are higher or lower then average but they give us an idea of the progress made through the years. Yes it is understandable that the later year bikes have larger motors in them, this is a part of the progression.
Lines are listed in torque and then Hp. It would be to complicated to view them clumped together.
The power that a stock 99 made at 5000 RPM's is that same as what a Stock Vision makes at 2800 RPM's
Sole Bloger
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| Lloyd'z Motor Workz does it again. Almost| 6/24/2008 6:15:33 AM | |
Well we've gone a full year and a half with noone able to beat us at any of the Victory drags we've attended.
That is up till this weekend. Congrats goes to Brian formerly of Victory of Southern Maryland for being able to beat Torch in the finals at MIR in Maryland this weekend. These 2 guys paired off last year in the finals and it was Torch who beat out Brian by 5 thousandth's. This time the tables turned and Brian beat the Torch out by 3 Hundredth's.
We did however still remain top Qualifier with a 10.80 pass done on a slipping clutch. Boy our Lil ole 100 sure is running good.
Lloyd
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