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MetalMan · 10.29.2005, 07:40 PM

You could run that setup, but it would be very demanding on the batteries. Why not just run your 7XL on 5s Lipo, and then gear down? That shouldn't be too hard on the 9920. The 9920 will actually run more efficiently with a fan on it. This is because as the temp. of a FET goes up, the resistance of it also does, causing even more heat. So, if you keep it cooler, less voltage will be wasted, which means higher efficiency.

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MetalMan RC-Monster Mod Offline Posts: 5,297 Join Date: Mar 2005 Location: SoCal	10.29.2005, 07:40 PM You could run that setup, but it would be very demanding on the batteries. Why not just run your 7XL on 5s Lipo, and then gear down? That shouldn't be too hard on the 9920. The 9920 will actually run more efficiently with a fan on it. This is because as the temp. of a FET goes up, the resistance of it also does, causing even more heat. So, if you keep it cooler, less voltage will be wasted, which means higher efficiency. SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz