Carlos Casas has wrote this useful guide to upgrade the venerable G25/G27. You can find the original spanish version on the TSS site
The original power supply of the G25/G27 steering wheel has 24V and 1,75A. This means that it can power up to 42W.
The engines inside the steering wheel sometimes need peaks above these 42W to work properly, so if the original power supply is used, engines stop to work in a optimal way and even can be block.
Trying to solve this little shortcoming we can replace the original power supply by a 24V and 6,5A ~ 8,25A new power supply.
With this features we can get 4 times more power than the original one. From 156W up to almost 200W.
There is no real danger in the steering wheel with these power supplies. Voltage keeps the same so, there is no linked overheating problems. It is simple, we feed those power peaks in the engines with an extra amperage.
This modification is not related with others power supply modifications like ARC, which tried to double the FFB of the steering wheel adding a 48V, additional boards and fans.
I will put you an example to try to explain the difference between V and A.
Imagine a water pipe. Pipe width is equivalent to 24V, water pressure would be the amperage, quantity of water liters per second passing through the pipe. More water pressure, more amperage.
If you have a water pump at the end of the pipe, this pump will work better (more efficiently) if the stream is bigger.
Bu if we change the width of the pipe (voltage) the stream will flood the water pump, or in our case, burning the wheel.
So, what are we going to achieve?
This is a little and relatively cheap upgrade on your G27. We are not going to reach FFB levels shown in the Thrustmaster Tr300 or Tr500.
– New power supply
AC 100/220V DC 24V 6.5A 150W Fuente de Alimentación Conmutada Transformador
or
Fuente de alimentación LED 24V/200W/8.25A, para interiores
– Gembird PC-186A-VDE – Cable de alimentación 15, 1.8m, 10A, color negro
– Cablematic – Conector de alimentación DC 2.5mm 5.5mm
– OUVER CABLE AUDIO HQS OFC TRENZADO 1M 2×1,5mm AL CORTE
There are two key factors to configure FFB properly; clipping and dead zone.
Clipping means that FFB is working over his maximum allowed performance and all the forces over these maximum are transmitted with equal intensity.
Dead zone otherwise, where our wheel cannot generate enough minimum force due to the internal mechanical resistance forces. We cannot feel them.
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Interesting mod ,but whay go to all this trouble when you can buy a Chinese Universal 100V-240V for DC 24V 4A 96W Power Supply Adapter online http://www.aliexpress.com/item/Overvalue-AC-Universal-100V-240V-for-DC-24V-4A-96W-Power-Supply ??
Would this work OK ??
I cant see the link but it should work though has less amperage than PSU on the post and the effect should be lighter.
Here is a link to 24v 7.5A 180W but is not cheep and I wonder about how it could dissipate any heat build up.Your option may be better.Have you your option operating on a G27 unit now ? http://www.aliexpress.com/item/24V-7-5A-180W-Switching-Power-Supply-AC-DC-Adapter-24V7-5A-DC-Voltage-Regulator-Power/32599136281.html?spm=2114.13010208.99999999.269.3QqIha
OMG. The general rules that apply to any consumer is that the voltage is constant and amperage is variable, depending on what the consumer needs. However in case the consumer requires more amperage that is available from the power source than a short is produced. Now, if Logitech considered it's product never, ever would require more than 1.75 amps this means with maximum settings, and usually the power supply provided should have more room against a short and against overheat. So no matter how high amperage the power source, probably the wheel itself would never require more than 1,2A. Also the optimum yield of power supply unit being somewhere between 30 and 70% of the maximum amperage available, 1.75 in this case (outside this range the yield is dramatically decreased, even 50% or less) means that if you buy a 12A power supply for it, not only that will get no performance increase because is not requested from psu by the wheel, but you'll consume a hell lot of more power due to the very low yield of the psu, especially if it's a cheap one.