low voltage on idle

[Oliverstrother]

Will do, SH-775?

I ordered one of these.

http://www.electrosport.com/street-...1-82/suzuki-gs-series-regulatorrectifier.html

Any good?

 

[tom203]

NO, you don't want that unit. send it back,tell them you've been ill !

you want the SH-775. Steve has done the shopping or try a local Polaris dealer and haggle. you want Polaris part #4012941

http://www.thegsresources.com/_forum/showpost.php?p=1998089&postcount=104

 

[posplayr]

Oliverstrother; My previous stator started to give results like your quick test stats. I have an onboard voltmeter ,so out of curiosity, I rode with it like this for about 15 hours watching and waiting. It was enough to keep bike going- but never much above 13 volts even at 5k. When I pulled stator out, one small section was BBQ.

Get another stator, and upgrade to the SH-775

and read GS Stator in my signature.

 

[bwanna]

I just recently added the SH775 and noticed low voltages, which led me to measuring the no-load ACv from the stator. I got the same readings as Oliverstrother did, with about 18-20vac at idle and about 63vac at 5k rpm.

I'm thinking of winding a stator in the Delta configuration using OEM wiring 20AWG.

What are your thoughts on this?

 

[posplayr]

I just recently added the SH775 and noticed low voltages, which led me to measuring the no-load ACv from the stator. I got the same readings as Oliverstrother did, with about 18-20vac at idle and about 63vac at 5k rpm.

I'm thinking of winding a stator in the Delta configuration using OEM wiring 20AWG.

What are your thoughts on this?

It a DIY shot in the dark exercise.

To have any hope of a deterministic outcome, you would need to determine the design parameters of whatever you are trying to replace and mathematically predict the outcome of your experiment. That way you will have some idea if you are going to at least satisfy the design parameters of the existing system.

What you plan may very well work, but what I told you is what I think.

 

[bwanna]

Ok. I switched back to the original r/r shunt regulator and the voltage output is 13.6 @idle and 14.1 from 2k up to 5k.

But on the sh775 I get lower voltage outputs with the same stator.

 

[posplayr]

Ok. I switched back to the original r/r shunt regulator and the voltage output is 13.6 @idle and 14.1 from 2k up to 5k.

But on the sh775 I get lower voltage outputs with the same stator.

what are the back to back comparison numbers and RPM's

 

[bwanna]

what are the back to back comparison numbers and RPM's

Here they are:

Shunt R/R____Idle_____2K_________5K
____________13.6____14.1________14.1

SH775_____12.4-13.4__13.5_______13.99-14.1

UPDATE:

I did the revised Phase B testing procedures, specifically measuring the stator legs under load (connected to the R/R)
All leg-leg voltage were 11vac @ idle and 24.4vac at 5k
all leg-ground voltages were 7.5vac@ idle and 15-20vac at 5k

 

[bwanna]

Posplayr, can you maybe explain why I'm getting two different vdc outputs from the r/r's using the same stator output?

 

[posplayr]

Here they are:

Shunt R/R____Idle_____2K_________5K
____________13.6____14.1________14.1

SH775_____12.4-13.4__13.5_______13.99-14.1

UPDATE:

I did the revised Phase B testing procedures, specifically measuring the stator legs under load (connected to the R/R)
All leg-leg voltage were 11vac @ idle and 24.4vac at 5k
all leg-ground voltages were 7.5vac@ idle and 15-20vac at 5k

Never heard of that test, but very interesting now that you did them. Actually so have I but without the wave forms, it is hard to tell what it means.

What shunt R/R are you using a MOSFET? That would explain these results. FH0012 for example?

 

[bwanna]

Never heard of that test, but very interesting now that you did them. Actually so have I but without the wave forms, it is hard to tell what it means.

What shunt R/R are you using a MOSFET? That would explain these results. FH0012 for example?

I don't know, but it's a standard type shunt r/r from eBay. I think it's originally identified for a Honda.

I'm assuming the leg to ground vac isn't a good thing? But it being universal is what's difficult to figure out.

 

[posplayr]

I don't know, but it's a standard type shunt r/r from eBay. I think it's originally identified for a Honda.

I'm assuming the leg to ground vac isn't a good thing? But it being universal is what's difficult to figure out.

The measurements to ground when you have the R/R don't mean much. The stator is then tied to ground via a diode to ground.

Well what ever type of R/R it is it has better performance than the SH-775 at low RPM. This is when the R/R has to put out as much of the stator voltage as it can. Your SHUNT is doing better by loosing less. In regulation, they are both trying to get rid of charge and so they control to the same output voltage although one does it by shunting and then other by SERIES opening.

 

[bwanna]

The measurements to ground when you have the R/R don't mean much. The stator is then tied to ground via a diode to ground.

Well what ever type of R/R it is it has better performance than the SH-775 at low RPM. This is when the R/R has to put out as much of the stator voltage as it can. Your SHUNT is doing better by loosing less. In regulation, they are both trying to get rid of charge and so they control to the same output voltage although one does it by shunting and then other by SERIES opening.

I was expecting the sh775 to at least put out 14.4 vdc. The fact that it only maximizes to 14.1v has me a little concerned.

Regarding the stator, should I consider replacing it?

 

[posplayr]

I was expecting the sh775 to at least put out 14.4 vdc. The fact that it only maximizes to 14.1v has me a little concerned.

Regarding the stator, should I consider replacing it?

You should do the Revised Phase A tests to measure voltage crops at 5K RPM(Se GS Charging health in my Signature)and see how bad your connections are. That could account for the low charging voltage. The Series is not magic. It will still under charge with resistance between battery and R/R.

 

[posplayr]

I don't know, but it's a standard type shunt r/r from eBay. I think it's originally identified for a Honda.

I'm assuming the leg to ground vac isn't a good thing? But it being universal is what's difficult to figure out.

A picture might help people identify it ; also a picture of any identifying marking.

 

[tom203]

bwanna.... a while back you posted this

"I just did the upgrade on my 82 gs450T from the stock Shunt R/R to the SH775. Wow is all I have to say. I've observed a noticeable difference. I have a 60W HID headlight, plus two 55W HID Driving lights. On the stock R/R, the driving lights weren't really as bright as would be expected. When I plugged in the SH775, these same lights were much brighter."

So are your tests with all this stuff on?

 

[bwanna]

bwanna.... a while back you posted this

"I just did the upgrade on my 82 gs450T from the stock Shunt R/R to the SH775. Wow is all I have to say. I've observed a noticeable difference. I have a 60W HID headlight, plus two 55W HID Driving lights. On the stock R/R, the driving lights weren't really as bright as would be expected. When I plugged in the SH775, these same lights were much brighter."

So are your tests with all this stuff on?

The test were done with only the main headlight on, which does appear to be slightly more potent with the SH775. My concern came afterward when I started noticing the voltages weren't as high as with the standard R/R.

 

[bwanna]

A picture might help people identify it ; also a picture of any identifying marking.

Here you go. This is a picture of the shunt R/R:

http://www.4shared.com/download/CTU6RTCvce/Shunt_R-R.jpg?lgfp=3000

 

[posplayr]

Here you go. This is a picture of the shunt R/R:

http://www.4shared.com/download/CTU6RTCvce/Shunt_R-R.jpg?lgfp=3000

Nice picture, are there any marks on it?

It is not one of the Shindigen FET units, perhaps it is another FET type that is more efficient that the SCR SH-775 at low RPM.

http://www.tlzone.net/forums/suzuki-tl1000r-tl1000s-forum/111804-shindigen-fh012aa.html

This is begging for someone to do back to back SH-775 and Compufire tests for low RPM performance. I already know that the CF is more efficient than a MOSFET SHUNT FH0012A (based on my previous detailed scope measurements) so the CF is probably has a noticeably higher output voltages than the SH-775 as well.

Doing the same set of tests as above would confirm that suspicion. :-\\\

 

[bwanna]

Nice picture, are there any marks on it?

It is not one of the Shindigen FET units, perhaps it is another FET type that is more efficient that the SCR SH-775 at low RPM.

http://www.tlzone.net/forums/suzuki-tl1000r-tl1000s-forum/111804-shindigen-fh012aa.html

This is begging for someone to do back to back SH-775 and Compufire tests for low RPM performance. I already know that the CF is more efficient than a MOSFET SHUNT FH0012A (based on my previous detailed scope measurements) so the CF is probably has a noticeably higher output voltages than the SH-775 as well.

Doing the same set of tests as above would confirm that suspicion. :-\\\

I seem to recall reading somewhere about a switch over for the two regulators. Where at low rpm's it would use the one regulator, and at high RPM's it'd switch over to the other regulator. I wonder if that is a legitimate way if using the best of both types?

Posplayr- can you verify the vac to ground village not being an issue?