 Some idle speed/voltage/ProCom observations
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Joined: Oct 2012
Posts: 459 Likes: 1
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OP
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Joined: Oct 2012
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Hey guys we have had alot of threads lately regarding bad cdis and what not. Until TTP picked up another option Pro Com was our only choice for an aftermarket replacement. I know a few guys think that lower voltage affects the Pro Com negatively and I tossed out the idea of it being idle speed. Well I went and bought a multimeter and decided to check a few things out. Bear in mind that I replaced my cdi with a Pro Com last October. With my idle set at 1150 rpms I am getting 14.6 volts across the battery terminals, when I back it down to 1050 rpms I am getting 13.4 volts across the terminals, and at 1000 rpms I am getting 12.5 to 12.4 volts across the
terminals. Now my Speedmaster is a 2003 with nearly 50,000 miles on it. So it seems that the idle speed affects how many volts are being put out. Now whether or not this is due to our less than stellar rectifiers or something else is beyond me. Just wanted to share my observations with you guys.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Some idle speed/voltage/ProCom observations
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Joined: May 2012
Posts: 46
Greenhorn
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Greenhorn
Joined: May 2012
Posts: 46 |
Hey, thanks. How well does your bike idle at 1000 rpm and 12.5 volts? Does it stumble or miss at all?
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Re: Some idle speed/voltage/ProCom observations
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
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Quote:
Hey, thanks. How well does your bike idle at 1000 rpm and 12.5 volts? Does it stumble or miss at all?
At 1000 rpms my bike acts like it is laboring to stay running. As I adjust the idle speed up it smooths out and runs great at 1150 rpms, also where it is putting out 14.6 volts. Adjusting it above that doesn't increase the voltage out put. I know that you said that you have been in touch with Pro Com and what not but as I said over in the Pro Com thread I think that your issue is the carb flooding when the choke is pulled out. Also I still have the stock regulator/rectifier.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Some idle speed/voltage/ProCom observations
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Joined: May 2012
Posts: 46
Greenhorn
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Greenhorn
Joined: May 2012
Posts: 46 |
Quote:
Quote:
Hey, thanks. How well does your bike idle at 1000 rpm and 12.5 volts? Does it stumble or miss at all?
At 1000 rpms my bike acts like it is laboring to stay running. As I adjust the idle speed up it smooths out and runs great at 1150 rpms, also where it is putting out 14.6 volts. Adjusting it above that doesn't increase the voltage out put. I know that you said that you have been in touch with Pro Com and what not but as I said over in the Pro Com thread I think that your issue is the carb flooding when the choke is pulled out. Also I still have the stock regulator/rectifier.
Ok, yeah thanks for the heads up on the lower t. One of my next moves is going to be disconnecting the charcoal canister system (mine is a CA setup). I think the vent you are talking about connects to that. Regarding voltage, even when warmed up and choke "in", my bike will stumble as yours does if I read voltage below 12.5, no matter the rpm, but that is typically 1100 or lower.
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Re: Some idle speed/voltage/ProCom observations
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
Adjunct
Joined: Oct 2012
Posts: 459 Likes: 1 |
Quote:
Quote:
Quote:
Hey, thanks. How well does your bike idle at 1000 rpm and 12.5 volts? Does it stumble or miss at all?
At 1000 rpms my bike acts like it is laboring to stay running. As I adjust the idle speed up it smooths out and runs great at 1150 rpms, also where it is putting out 14.6 volts. Adjusting it above that doesn't increase the voltage out put. I know that you said that you have been in touch with Pro Com and what not but as I said over in the Pro Com thread I think that your issue is the carb flooding when the choke is pulled out. Also I still have the stock regulator/rectifier.
Ok, yeah thanks for the heads up on the lower t. One of my next moves is going to be disconnecting the charcoal canister system (mine is a CA setup). I think the vent you are talking about connects to that. Regarding voltage, even when warmed up and choke "in", my bike will stumble as yours does if I read voltage below 12.5, no matter the rpm, but that is typically 1100 or lower.
Cannister huh? I would ditch the emission cannister and the air injection system especially if you don't live in California. I'm not sure if motorcycles are subject to periodic emission checks in California but if they are not definitely get rid of them. The issue with your choke is most likely related to the way the carb is being vented and I am sure that cannister does not help. However I think that we may now be on to something with the Pro Com. Since you spoke with Pro Com and they said that it doesn't like being under 12.5 volts people with one who are having issues with the Pro Com may have their idles set to low to generate enough voltage for it to work effectively. Increasing the idle to around 1150 rpms seems to help with that or doing the regulator/rectifier mod or upgrading to a mossfet may be the solution to generate more volts at a lower idle may be the solution.
Last edited by JD13; 09/04/2014 8:01 AM.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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Re: Some idle speed/voltage/ProCom observations
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Joined: Oct 2012
Posts: 459 Likes: 1
Adjunct
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OP
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Hmm...this lower voltage ouput at low idle speeds has also got me wondering if this is what is giving the guys with efi bikes the stalling issue when their bike's idle is set below 1150 rpms. Maybe they are not getting enough volts at lower idle speeds to keep everything associated with the electronic fuel injection system going properly and if the idle speed is raised they are? Just throwing out an idea. Would be interesting to see how someone's bike with efi and the regulator/rectifier mod or mossfet upgrade is running.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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