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How many volts to the boost sensor(SOLVED)

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How many volts to the boost sensor(SOLVED)

PostAuthor: gazownik » Fri Jun 08, 2018 3:23 am

hello.
I will "connect" to this subject, because I don't want open new one...
I have a question, maybe somebody know have a info. I want to know how many volts are going to a boost sensor in Virago 1100 from TCI box.
I have some doubds, because I see on red/black 8V without load with load (connected boost sensor) 6,5V.
I am wondering that something is wrong with TCI box in my bike... I checked wires and all wires has good connection (1Ohm).
If somebody know please let me know if doesn't know it is very easy to check it (it should take around 5 minutes)
Last edited by mark75 on Fri Jun 15, 2018 6:05 pm, edited 3 times in total.
Reason: Split from TCI thread

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Re: How many volts to the boost sensor

PostAuthor: Jake » Fri Jun 08, 2018 7:48 am

gazownik wrote:hello.
I will "connect" to this subject, because I don't want open new one...


Sorry, that is threadjacking with a totally unrelated issue. You now have a new thread.
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Re: How many volts to the boost sensor

PostAuthor: bstig60 » Fri Jun 08, 2018 9:35 am

I am not aware of any voltage spec that states what the voltage should be there. However, if your bike is running OK, I wouldn't worry about it. The pressure sensor controls the spark advance at rpm, so if it wasn't working, you would be aware of it.
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Re: How many volts to the boost sensor

PostAuthor: Flyingdog » Sat Jun 09, 2018 2:38 am

From what little I know of those (pita) things: Battery @ 12v & output be 3v +/- 0.03v . Battery closer to 13v(+), will show closer to 3.3v.
Dependent on battery state of charge at the time.
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Re: How many volts to the boost sensor

PostAuthor: mark75 » Sun Jun 10, 2018 3:18 pm

pressure sensor diagnostic is on page 6-32 of OEM manual...

requires an 8vDC battery input with output voltage of 3.0vDC +/- 0.05vDC
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Re: How many volts to the boost sensor

PostAuthor: gazownik » Sun Jun 10, 2018 3:37 pm

Jake wrote:Sorry, that is threadjacking with a totally unrelated issue. You now have a new thread.

Ooh je that's true. I don't know what happened... Maybe I was doing something else at this time...
bstig60 wrote: However, if your bike is running OK, I wouldn't worry about it. The pressure sensor controls the spark advance at rpm, so if it wasn't working, you would be aware of it.

I am a little bit worry because over 3500rpm doesn't work well like should work... some vibrations.
- sparks ok
- pressure in cylinders ok
- valve tolerance ok
- carbs ok
* fuel level ok
* are clean
* new membrans
* synchro
* good consumption
* rich mixture while acceleration (checked by UEGO sensor)
mark75 wrote:pressure sensor diagnostic is on page 6-32 of OEM manual...

requires an 8vDC <a class="vglnk" title="Link added by VigLink" target="_blank" href="http://i.viglink.com/?key=bfc8dfa63260fbbdb1ca3d868f843ef2&insertId=5bce336c88bfbddc9dd29fe995e95437&type=L&mid=undefined&exp=-1%3Ana%3A0&libId=ji9acwrn01000c3n000DAes0ahyam&loc=http%3A%2F%2Fviragotechforum.com%2Fposting.php%3Fmode%3Dquote%26f%3D140%26sid%3Dd4e0ca269015e6218c243d6e89c4d834%26t%3D59926%26p%3D479633%23preview&v=1&out=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dp2050890.m570.l1313.TR10.TRC0.A0.H0.Xbattery.TRS0%26_nkw%3Dbattery%26_sacat%3D6000&ref=http%3A%2F%2Fviragotechforum.com%2Fposting.php%3Fmode%3Dquote%26f%3D140%26sid%3Dd4e0ca269015e6218c243d6e89c4d834%26t%3D59926%26p%3D479633&title=ViragoTechForum.com%20%E2%80%A2%20Post%20a%20reply&txt=%3Cspan%3Ebattery%3C%2Fspan%3E" rel="nofollow"><span>battery</span></a> input with output voltage of 3.0vDC +/- 0.05vDC

I saw only info how to check this sensor by battery in different manual. So if this sensor require 8v it has 8V without load with load has 6,5V (in TCI is resistor 180 Ohm). So that looks ok...

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Re: How many volts to the boost sensor

PostAuthor: Jake » Mon Jun 11, 2018 10:44 am

gazownik wrote:I want to know how many volts are going to a boost sensor in Virago 1100 from TCI box.
I have some doubds, because I see on red/black 8V without load with load (connected boost sensor) 6,5V.



The manual states 8V input, no mention of having the engine running, so I presume "no load". The output voltage should be 3.0V ( + or - .05V ).

More or less than that, replace the unit.

Of note, the manual also says to be sure the pressure intake tube is free of obstruction, that could be pinched or kinked too.
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Re: How many volts to the boost sensor

PostAuthor: gazownik » Tue Jun 12, 2018 12:53 am

Pipe to the sensor is ok without any pinched or kinked.
Thank's for you reply, I will connect everything and I will just disconnect sensor and check haow the bike will running.
This sensor looks fine ( just with 12,8V battery has 3.1X V) but it works, when I make symulation of vaccum, I see output value are changed.
One more time thank's.

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Re: How many volts to the boost sensor

PostAuthor: bstig60 » Tue Jun 12, 2018 4:44 pm

Is this problem solved????
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Re: How many volts to the boost sensor

PostAuthor: gazownik » Wed Jun 13, 2018 1:22 am

bstig60 wrote:Is this problem solved????

No, isn't solved ( it means sensor works, has correct value input and output, vacuum pipe are ok ). I asked because I had some doubts... I am trying to find problem.
I have last idea, I will try to adjust dinamic (while drive) value vacuum presure in manifold suction...

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Re: How many volts to the boost sensor

PostAuthor: Flyingdog » Wed Jun 13, 2018 1:38 am

gazownik wrote:I have last idea, I will try to adjust dinamic (while drive) value vacuum presure in manifold suction...


Don't take this wrong...but, huh? Adjust dynamic pressure?

gazownik wrote:I am trying to find problem.


I've mighta missed something..what problem you chasing? Backfiring? Carb hickups? Doubts about the pressure switch? TCI not doing it's job? Curious...
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Re: How many volts to the boost sensor

PostAuthor: gazownik » Wed Jun 13, 2018 9:00 am

gazownik wrote:I've mighta missed something..what problem you chasing?

Vibration over 3500RPM, sometime higher sometime lower... When an engine is it is stronger.
Flyingdog wrote:Don't take this wrong...but, huh? Adjust dynamic pressure?

On idle pressure is the same, on 1500RPM pressure is same on cylinder 1st and secon. during drive this pressure is different.
How to fix it I am thinking to use washer under spring to increase tension (light tension).

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Re: How many volts to the boost sensor

PostAuthor: faffi » Wed Jun 13, 2018 4:27 pm

The vacuum ignition control unit should not cause any changes in vibrations, only affect power and/or consumption if defect AFAIK. It will affect both cylinders in the same way.

Basically, as I understand it, the unit will increase timing advance under light throttle to improve consumption and retard the ignition to improve power and reduced the risk of detonation under heavy throttle.
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Re: How many volts to the boost sensor

PostAuthor: Flyingdog » Thu Jun 14, 2018 2:02 am

gazownik wrote:1500RPM pressure is same on cylinder 1st and secon. during drive this pressure is different.
How to fix it I am thinking to use washer under spring to increase tension (light tension).


Still totally confused what pressure and washer under a spring?. :con: Oh well..all I can say if these pressure sensors were so great or needed.."All" viragos would have them. Removed mine back in the 90s and never gave it a second thought. 9 outta 10 times epa gets their mitts into something...it's usually ends up to be pita :bg:
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Re: How many volts to the boost sensor

PostAuthor: gazownik » Thu Jun 14, 2018 8:06 am

Flyingdog wrote:
gazownik wrote:1500RPM pressure is same on cylinder 1st and secon. during drive this pressure is different.
How to fix it I am thinking to use washer under spring to increase tension (light tension).


Still totally confused what pressure and washer under a spring?

Align pressure behind throttles on cylinder one and second. Standard process is to set this value on idle (by using enrich screw) over idle speed around 1500 rpm by using screw for synchro (both carb).
And it is ok in my case on idle and till 3000 rpm. over this threshold pressure are different ( measured by gauge, two gauged was connected while drive) and while drive this pressure was different not so much but it was.
Different pressure = different dose of mixture and air = different "kick" on piston. may be it is a reason of vibration .... i don't know...

I have spoke with guy which has experience with carbs. And he said that I have one last thing to do. Increase or decrease pressure (tightness spring pushing on membrane) to align valuses of dose air/mixture to both cylinders.

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Re: How many volts to the boost sensor

PostAuthor: faffi » Thu Jun 14, 2018 8:26 am

Seems like you are discussing carburetor sync and carburetor piston diaphragms plus returning springs, and not ignition related?
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Re: How many volts to the boost sensor

PostAuthor: Flyingdog » Thu Jun 14, 2018 9:16 am

gazownik wrote:Align pressure behind throttles on cylinder one and second. Standard process is to set this value on idle (by using enrich screw) over idle speed around 1500 rpm by using screw for synchro (both carb).


Eh...probly just one of those language barrier thingies...as this statement "may" refer to increments on a manometer.
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Re: How many volts to the boost sensor

PostAuthor: gazownik » Fri Jun 15, 2018 1:37 am

faffi wrote:Seems like you are discussing carburetor sync and carburetor piston diaphragms plus returning springs, and not ignition related?

The topic has evolved. I have gotten answer on my question few posts above. So it can be closed.

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