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PostPosted: Sat Jan 28, 2017 12:59 pm 
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SAAB Sport & Rally Guy
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Joined: Sat Apr 23, 2005 6:13 pm
Posts: 25898
Location: Whitley Bay
Car Model: 96, C900, 9k, 9-3 & 9-5
Yesterday morning I went to top up the washer bottle on the DE. It was pitch black as it was before sunrise and I was working in the shadow of the bonnet.

There was a red glow between the battery and the DI pack which looked as though it was coming from an LED.

I lifted the battery cover and found one of these

Image

These are some of the claims for it....

·Improved audio quality.
·Increased torque and response and power.
·Stabilized idling and improved engine kick over.
·Increased headlight brightness.
·Improved fuel economy.
·Improved battery life.

Someone spent £50 or so on it but tbh I am doubtful. I'm especially doubtful having seen the claims for headlamp brightness, especially as I have the headlamp fault warning lamp showing as it is....

What do we think?


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PostPosted: Sat Jan 28, 2017 1:13 pm 
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UKS Addict

Joined: Thu Sep 01, 2005 5:31 am
Posts: 3871
Location: Bucks
Car Model: Saab NG 9-5 Aero
A voltage stabiliser is simply a voltage regulator, you have one already in your alternator. As a voltage regulator can only regulate down, that is it can supply a stable voltage below the supply voltage, it cannot possibly make your headlights brighter. If you have HIDs (BiXenon) headlights they already have regulation to supply the required high starting voltage so it won't affect those. A stabiliser may improve audio quality.
The DI cassette has voltage regulation already as will the Engine Control Unit, DICE and TWICE because they are designed to function with a low battery voltage.
I can't see how it will affect fuel consumption, torque or power

Some research suggests that these devices do slightly more than I originally suggested. They damp out voltage fluctuations as well. A really good one might prevent voltage drop due to load but that is what the battery should be doing already. This might be of interest.http://www.superstreetonline.com/how-to/interior-electrical/impp-1010-voltage-stabilizers-can-increase-power-and-torque-fact-fiction/


Last edited by GeoffR on Sat Jan 28, 2017 1:31 pm, edited 1 time in total.

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PostPosted: Sat Jan 28, 2017 1:23 pm 
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SAAB Sport & Rally Guy
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Joined: Sat Apr 23, 2005 6:13 pm
Posts: 25898
Location: Whitley Bay
Car Model: 96, C900, 9k, 9-3 & 9-5
Exactly what I was thinking. I assume (as it is connected in parallel with the battery) it is a bank of resistors and capacitors. Never had one before and, as you say the Alternator already has one and the battery does a fairly good job of damping out voltage fluctuations in any case...


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PostPosted: Sat Jan 28, 2017 1:24 pm 
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Talking Turkey
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Joined: Mon Apr 02, 2007 11:52 am
Posts: 22684
Location: not in a SAAB.
Car Model: One of the first RHD 9-5s
On a cheap nasty car that suffers audio interference it may be of benefit but all the other bits are snake oil. As the SAAB Audio is very hig grade and well suppressed already this is just a waste of money and electric which will have a (very very marginal) negative effect on fuel economy rather than a positive one.

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