I talked to KRC quite a bit about supercharging mine last June. We came to the conclusion that it would be pretty easy to do with the Paxton kit for the 4.7, but the rings and pistons really should be upgraded because of the ring problem. We discussed some custom forged pistons from Ross based off their 4.7 pistons.
I'm looking at the numbers for the KB supercharged Liberty again and they still just don't look right. The caption says divide by 0.8 to get engine horsepower, which would denote it's an automatic. The automatic 3.7 in a stock Liberty puts 155 hp to the ground using a Dynojet dyno, not 166. That would be a factory freak. However, a good driver can get a low 17 run in the 80's out of a stock Liberty, not 18.6 at 75.1. So we know if it's a factory freak, it's not in a good way. Also, a 16.1 while making 235 hp to the ground with the supercharger doesn't look right. If we assume it is off by the same ratio as the stock numbers, about 7%, it puts us around 218 hp to the ground. This would make me think that the torque management wasn't deleted. In my experience you can't get the Libby to put more than 215-220 hp to the ground with the torque management no matter what you do. A 100 hp wet shot of N2O won't even do it. Only doing a 9.7 second 0-60 makes be think the torque management kicked in pretty badly also. It looks like the dyno was adjusted to make the stock Libby put around 80% of 210 hp to the ground. My Libby with a stock motor and no nitrous really shouldn't be able to outrun a supercharged one.
_________________ June 2001 Liberty Limited 4X4
Frankenlift II Premium, Al's Upper Arms, 245/75R16 C Silent Armors on Moabs, RL Skink Super Sliders, Rear DTT, Riddler Diff Cover, Fastman Throttle Body, Profinish-Proglass Hood, Borla Dual Outlet Exhaust, TransGo Reprogramming Kit, APS Stall Converter, 4.10 Gears, B&G Chrysler PCM, Lots of Line-X, etc...
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