| Author | Message | ||
     Sarodude |
Does anyone else go ABSOLUTELY NUCKIN' FUTS over the abrupt nature of how the ignition curve switches on VOES bikes and the Blast? Is there a decent, easy to retrofit proper 3D ignition box that uses TPS or MAP in a proportional manner instead of binary? I don't wanna lose the mileage of a more advanced timing under low throttle / high vac conditions - I just want a system that's more transparent like on my 02 Dyna. -Saro | ||
| Henrik |
Saro, back in the day I remember magazine articles about adjusting the VOES. You'd need a vacuum pump with a reasonably accurate gauge, as well as an electrical multi meter. IIRC, if you carefully dig out a silicone plug on the VOES, you can get to an adjustment screw. With the meter and vacuum hooked up to the VOES you can measure at what pressure (vacuum) the VOES opens and closes. That set-point can be changed with the adjustment screw. Haven't done it myself, and I'm speaking from vague memory, so be careful. Heck, I don't even know if it'd do you any good  . I just remember it mentioned as a performance tweak for built and well tuned motors. Henrik | ||
| Sarodude |
I'm familiar with VOES recalibration - but you'd still have a binary type of deal. Something with proportional advance based on RPM and MAP or TPS would make a more seamless system. Didn't some recent sportster have such a system? -Saro | ||
| Sparky |
Saro, I seem to recall an article that mentioned putting a type of restriction in the vacuum line to the VOES. It had the effect of slowing down the abruptness of the crossover point wrt throttle inputs. The restriction could be something as simple as a piece of tubing wedged inside the vacuum line. | ||
| Natexlh1000 |
He wants a linear analog vacuum sensor or a TPS. He doesn't like the digital nature of the switch. I personally have never heard of a thing like that. Perhaps the thing to do here is to hook up an LED to the VOES circuit and have it light up "super turbo power" on the dash? | ||
| Henrik |
honestly don't know?? Let us know what you find. Henrik | ||
| Oldog |
sounds like what you want is mechanical advance. | ||
| Blake |
Sparky, the VOES would still be an on/off (binary) switch. Restricting the vaccum line's flow would only delay the switch's turning on and off. | ||
| Sarodude |
OK... "Mechanical Advance" or "Centrifugal Advance" are simply RPM dictated advance curves. We already have that - just simulated in solid state. "Vacuum Advance" is load sensitive. We SORT OF have that with VOES or with the Blast's TPS based module - except that with the system's we're given, there are only 2 curves. There is an abrupt switch between these curves - and likely some efficiency being given away. If my ••• can feel the transition, then you better bet that there's a significant change in power / efficiency happening. Again, the my 02 FXD and I think some Sporter Sports use a MAP based "vacuum advance" for PROPORTIONAL as opposed to ON / OFF management of low power / high advance to high power / low advance settings. I guess nobody's ever felt it so bad or wanted to retrofit. -Saro | ||
| Oldog |
Saro. Again, the my 02 FXD and I think some Sporter Sports use a MAP based "vacuum advance" for PROPORTIONAL as opposed to ON / OFF management of low power / high advance to high power / low advance settings If you think that the "Vacuum Operated Electrical Switch" is a analog device tag on to it with a meter and see on your FXD, It sort of sounds like the ignition on the blast is either bad or that is just the nature of the thing. | ||
| Sarodude |
I never said VOES is analog. I said my 02 FXD and some Sportster Sports use a MAP sensor - a different animal than a VOES switch - and an ignition module that appreciates the finer granularity it provides. Again, the point seems moot. I don't figure most people care. -Saro | ||
| Fullpower |
saro if you can feel the voes shifting curves than it is NOT adjusted correctly. it should perform its transition at a light enough throttle opening that it will be invisible. are you quite certain that is what you are feeling? is it possible that your CV carb may have either a sticky slide, or a very week or "clipped" spring? my point here is that in normal operation, the voes shifts over to an early advance curve under very high vaccuum, light throttle conditions, like perhaps 5 or 6 percent throttle, and would shift into the late advance curve with a very slight additional application of throttle, but not enough to be really pulling hard. | ||
| Sarodude |
I feel it on the VOES bike (every VOES bike that I've ridden) and on the Blast 2 curve TPS setup (detectable on every blast I've ridden) and I feel it both while increasing throttle and decreasing throttle. Oh, the S2 has a QwikSilver carb - not a CV. The sticky slide scenario (!) wouldn't apply there anyway. -Saro | ||
| Ryker77 |
I like the idea of having a simple bike. thus I pulled the fuel injection and ECU from my X1. If you don't like the VOES then you can get an aftermarket ignition. select a good ignition curve and not use the VOES switch. | ||
| Sarodude |
If I don't like the binary nature of VOES, I can just rig the electricals to always behave in high load / low vac mode - and give up mileage in the process. Any system that ignores load will do such if it's intended to run well at WOT. On a race bike this doesn't mean jack. On a street ride, I think it's important. -Saro | ||
| Firemanjim |
Not so,Grasshopper--you have much to learn.Quiksilver very susceptible to sticky slide.Had to disassemble and clean the carbon off the backside annually or idle wuold hang up. | ||
| Natexlh1000 |
I suppose you could unplug the VOES wire and take it for a spin to see if it's the carb or not. | ||
| Sarodude |
FMJ- Could catch - except that on throttle opening, the stick wouldn't be an issue (unless the jackass riding the bike didn't feel the throttle hang up). Incidentally, my QS does stick. If we called closed throttle 1% open, then maybe it's like 1.1%. My idle sits around 50 - 100 RPM high sometimes until you play with the throttle. You can even hear a change in the sucking sounds from the intake. Sounds like your idle hanging scenario, jes? -Saro |
