XMODS EVO MOSFET Upgrade
MOSFET Upgrade, what is it?
Back in late August, 2005 I did some work with the XMODS EVO PCB and figured out a set of MOSFETS that improved the performance of the electronics. I also found that the MOSFETS can be easily stacked on top of each other to improve performance even further.
The stock MOSFETS of the EVO PCB can handle a lot of hot motors that the original XMODS PCB could not. Couple this with the easy to change plastic pinions and it makes the XMODS EVO even easier to upgrade to a hot motor.
Given this, it's still a very viable option to upgrade the EVO PCB's MOSFETS to the new and improved ones I've found.
Upgrading the MOSFETS adds the following advantages.
Improved torque, more power off the line.
Greater efficiency, runs cooler, less power dissipated.
Ability to stack MOSFETS for increased performance.
Increased runtime on the stock RS motors (Stage 1 and 2)
What MOSFETS are used?
I've found these MOSFETS to be the best replacement ones out there at time of writing.
PA1764/PA1770 are the stock MOSFETS in the EVO PCB. They carry a certain amount of resistance known as Rds(on). This resistance needs to be minimised to improve the performance of the EVO PCB. I have chosen two sets of MOSFETS for each type as excellent replacements to the stock ones.
As you can see the resistance of these replacement MOSFETS is just under half of the stock MOSFETS. Without going into electronics theory and Ohms Law, I'll tell you that this is a much better setup over the stock MOSFETS.
Where to get the new MOSFETS?
Ausmicro.com and myself have teamed up to provide you with these new MOSFETS for a good price with excellent service. Ausmicro.com is an established online ecommerce store that has been serving the micro RC community for a while now and I'm happy to recommend them.
You can get the EVO MOSFET upgrade packs here:
http://shop.ausmicro.net/index.php?currency=USD&cPath=25_39
I have created an installation document that I recommend you read before taking the plunge. It is very detailed with all the steps needed to upgrade the MOSFETS in your EVO XMOD.
http://www.woahnelly.com/stuff/xmods/EVOMOSFETInstallationGuide.pdf
It's on Adobe PDF format, goto www.adobe.com to get the free PDF reader.
Motor & Power Configurations?
I have tested the following motor/power combo's on the XMOD EVO with the new MOSFETS with success. Use this as a baseline when planning what motor and power combo you want to use.
Motor Power Source Comments Plasmatomic 4 cell 850mAh NiMh (4.8V) Runs warm on high gears, excellent punch, 2x2 stack. Plasmatomic 2 Cell ETEC 700mAh Li-Poly (7.4V) Runs warm -> hot on high gears, excellent punch, 2x2 stack. Pn Racing Anima 4 cell 850mAh NiMh (4.8V) Runs cool, excellent punch, 2x2 stack. RS Stage 2 4 cell 850mAh NiMh (4.8V) Runs cool, increased torque over stock 1x1 stack. iWaver XSPEED Plus 4 cell 850mAh NiMh (4.8V) Runs cool, 2x2 stack.
Hope you found this page useful.
Email me at
if you have any questions.
Cheers and enjoy!
ph2t.
