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VDST Battery voltage
- Thread starter TerryH
- Start date
Above is their phone number, just add the country code in front of the 248. above, his e-mail is gscaccia at technoresearch.com -send him your phone number and the best time to call you. Post the outcome.alwyn said:
Brian UK
GT Reference
I agree, diagnostic equipment is normally accurate. It will read what it sees. What it sees is what the ECU tells it.
I have a standard voltmeter on my Spada III. These are renowned for their spurious readings, but after some investigation, I found the meter to be surprisingly accurate, it read exactly the voltage on the end of the wire which connected it to the battery.
I suspect the same applies to what is seen by VDST.
I have a standard voltmeter on my Spada III. These are renowned for their spurious readings, but after some investigation, I found the meter to be surprisingly accurate, it read exactly the voltage on the end of the wire which connected it to the battery.
I suspect the same applies to what is seen by VDST.
your absolutely right brian,it tells you what it sees,but it is not seeing battery volts as the screen suggests,that the issue.since it is also directly connected to the battery there is no reason for it not to be able to display battery volts.but if it's not then let the user know what is being displayed..
still waiting for a reply to my e-mail that todd suggested..
still waiting for a reply to my e-mail that todd suggested..
Had some response to my e-mail to techno research,they asked if other readings were ok-i said yes so far,
what ecu-1aw 15rc.
and was i using a serial to usb adaptor?,to which i said yes(but questioned the relevance since other readings were ok)but that might be our problem.
just waiting for their response now,will keep you informed.
merry christmas...
what ecu-1aw 15rc.
and was i using a serial to usb adaptor?,to which i said yes(but questioned the relevance since other readings were ok)but that might be our problem.
just waiting for their response now,will keep you informed.
merry christmas...
Just had a reply from technoresearch,as follows:
"There is an outside possibility that the adapter could still be the problem
- could you check the brand & model of the one you are using? There are two
that we have specified: Keyspan brand, model USA-19HS, and then switched
(for lower cost) to Cablemax brand.
If you can find out if anyone is using either of these, and confirm whether
the other readings are indeed good, that would be helpful.
To get all the way to the answer however I think we are going to have to do
some investigation and unfortunately are now short staffed until the new
year. "
so if the people with this problem could possibly post their set-up i can forward this on,
i for one am using a decent but non named serial to usb adaptor.
"There is an outside possibility that the adapter could still be the problem
- could you check the brand & model of the one you are using? There are two
that we have specified: Keyspan brand, model USA-19HS, and then switched
(for lower cost) to Cablemax brand.
If you can find out if anyone is using either of these, and confirm whether
the other readings are indeed good, that would be helpful.
To get all the way to the answer however I think we are going to have to do
some investigation and unfortunately are now short staffed until the new
year. "
so if the people with this problem could possibly post their set-up i can forward this on,
i for one am using a decent but non named serial to usb adaptor.
nothing yet Terry,hoping for some more replies from the forum,even if their VDST's are giving correct battery readings,the more info the better...
Also with the holiday period just over i didn't expect anything,but i'll give until Sunday and i'll e-mail them and keep you posted..
Also with the holiday period just over i didn't expect anything,but i'll give until Sunday and i'll e-mail them and keep you posted..
GrahamNZ
High Miler
Hello Terry
These readings may be of interest to you. Acer laptop with XP and Keyspan USB adaptor:
Battery no-load at terminals after a run - 12.74V
Soon after with VDSTS connected and key on:
Battery readout at terminals - 12.12V
LCD screen readout - 11.8V
VDSTS readout - 11.8V
These readings may be of interest to you. Acer laptop with XP and Keyspan USB adaptor:
Battery no-load at terminals after a run - 12.74V
Soon after with VDSTS connected and key on:
Battery readout at terminals - 12.12V
LCD screen readout - 11.8V
VDSTS readout - 11.8V
GrahamNZ said:
Interesting, the VDSTS reports what the LCD reports. Both read what the ECU tells them to report as the battery voltage.
Spaceclam
Cruisin' Guzzisti
Todd measured the voltage on my bike once while he had the VSTD hooked up, because it was reading low. I dont remember the numbers exactly, but the tach, voltmeter, and vstd all read different numbers, varying by as much as .6 volts, battery being the highest! :shock:
even the cheapest harbor freight voltmeter is accurate to within .01 volts. Unless it's measuring voltage off the headlight circuit (even then, a .6v drop would indicate the wires involved are far too small for the loads they are carrying over the distance of 2 feet) then there is no excuse for this kind of variance.
It also means that a battery that should be able to start the bike, may not because the EVU sees a full half volt + difference from what the battery actually reads.
even the cheapest harbor freight voltmeter is accurate to within .01 volts. Unless it's measuring voltage off the headlight circuit (even then, a .6v drop would indicate the wires involved are far too small for the loads they are carrying over the distance of 2 feet) then there is no excuse for this kind of variance.
It also means that a battery that should be able to start the bike, may not because the EVU sees a full half volt + difference from what the battery actually reads.
GrahamNZ
High Miler
Spaceclam said:
Maybe. But after mucking about with the key on for a while, the bike cranked and started just fine. At that point the Voltage at the battery terminals would still have been at 12.12V.
When running along, the LCD readout is usually 13.3V, even when idling it's about that and from memory the Voltage at the battery terminals is almost 14V then. I should have checked what the readouts were at the battery terminals, LCD screen and on VDSTS with the engine running. Silly me.
Brian UK
GT Reference
Certainly when the engine is running, the battery voltage should be about 14, possibly more.
I've had a response from Sandro at Techno Research, as follows:
My response to Sandro was as follows:
"Thanks Sandro,for your reply.
No components need to be replaced yet.
The main issue is that we (several people on the Guzzi forum) are experiencing the same readings,i.e about 1.5 volt difference between the vdst voltage reading and the actual voltage reading taken directly at the battery. The difference is too great to be a voltage drop and too consistent from different users. Therefore we feel that we are not getting battery volt readings accurately from the vdst. As you can appreciate some people may interpret the low readings and suspect problems with 'for example' the charging system. It might be a minor issue but if the vdst display reads 'battery volts' then you would expect battery volts surely? Going forward, it might be worth amending future models to read 'ECU voltage' and not 'battery voltage' to avoid confusion. Could you possibly pursue this? What do you think about this? Thanks for your input, I will feed this back to the Guzzi forum and maybe hear from you soon."
So in a nutshell, if they can change the display on the VDST this should avoid any future confusion. I will let you know if I hear anything further. In the meantime, please be aware that you are not reading battery voltage accurately.
Cheers, Alwyn
My response to Sandro was as follows:
"Thanks Sandro,for your reply.
No components need to be replaced yet.
The main issue is that we (several people on the Guzzi forum) are experiencing the same readings,i.e about 1.5 volt difference between the vdst voltage reading and the actual voltage reading taken directly at the battery. The difference is too great to be a voltage drop and too consistent from different users. Therefore we feel that we are not getting battery volt readings accurately from the vdst. As you can appreciate some people may interpret the low readings and suspect problems with 'for example' the charging system. It might be a minor issue but if the vdst display reads 'battery volts' then you would expect battery volts surely? Going forward, it might be worth amending future models to read 'ECU voltage' and not 'battery voltage' to avoid confusion. Could you possibly pursue this? What do you think about this? Thanks for your input, I will feed this back to the Guzzi forum and maybe hear from you soon."
So in a nutshell, if they can change the display on the VDST this should avoid any future confusion. I will let you know if I hear anything further. In the meantime, please be aware that you are not reading battery voltage accurately.
Cheers, Alwyn