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| Adding a Supercharger http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=59&t=10874 |
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| Author: | Rocker7 [ Thu Jul 27, 2006 5:55 pm ] |
| Post subject: | Adding a Supercharger |
I have a spare supercharger off of a 3.8L Ford Thunderbird. I will within the next few months be adapting this honey to my '02 Libby. Doesn't appear to be too difficult, of course with some fab. I figure about a sixty hp gain with a 5-6 psi boost. Should be very torquey. Let me know what you guys think. |
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| Author: | Trodo [ Thu Jul 27, 2006 9:45 pm ] |
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Don't forget you'll need reprogram the computer. That the intake is a composite plastic so it's probably not strong enough and a new hood for clearance, different drive belt, hoses, intake, etc. I think that's they Kenny belle stopped making them. But if you can make it work, fantastic, you'll have a one of a kind. |
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| Author: | unixxx [ Tue Aug 22, 2006 8:29 am ] |
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Check out this page on the DodgeTalk forum: http://www.dodgetalk.com/forums/showthread.php?t=84204&highlight=3.7+paxton Apparently KRC is making a kit to put a Paxton on a 3.7L. Of course, you'd still have the hood clearance problem. If your Libby is lifted you'd probably be better off dropping the frontend carriage like Al; you would gain vertical clearance and also improve your CV angles. |
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| Author: | Trodo [ Tue Aug 22, 2006 10:14 am ] |
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I think that other forum post was a mistype. He probably meant 4.7. I checked out the site and the supercharger page. http://www.krcperformance.net/newconten ... rsnew.html Didn't see anything. It's kinda sad, a supercharger would be cool. Just too much work. |
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| Author: | unixxx [ Tue Aug 22, 2006 11:39 am ] |
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Phoned KRC Performance today and they said the 4.7 kit will work on the 3.7, you just need to trim the tube to be 1" shorter. They say everything else is compatible and that it has been done before. They also said that you should be fine with the stock pistons if you tune it properly. So, who's gonna try it 
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| Author: | Trodo [ Tue Aug 22, 2006 5:27 pm ] |
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Okay, that makes sense. Personally, that would be nice, but I haven't even got my JBA headers yet. Supposed to be the first week of Sept. I think it would be a little harder to explain away $5000 supercharger, if you know what I mean. |
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| Author: | IceColeNH [ Tue Aug 22, 2006 5:54 pm ] |
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Didn't know this existed until I found it one day. Its now discontinued. Perhaps if enough people show interest, they'll make it again. http://www.kennebell.net/superchargers/ ... bert37.htm |
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| Author: | KY Liberty [ Wed Aug 30, 2006 9:39 pm ] |
| Post subject: | |
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. |
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| Author: | KY Liberty [ Sun Sep 17, 2006 12:21 pm ] |
| Post subject: | |
Anybody know if this was perhaps the Performance West Liberty Patriot that KB ran with and without the supercharger? If those are numbers with a lift and 245/75R16 MTR's, it would explain things. |
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| Author: | ga_repoman [ Sun Jan 13, 2008 2:41 am ] |
| Post subject: | |
This might be a crazy idea but what about one of those STS exhaust chargers that go in place of the rear muffler ....That would solve the hood clearance issues http://www.ststurbo.com/universal_system Try this link... 
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| Author: | jerseykj [ Sun Jan 13, 2008 1:57 pm ] |
| Post subject: | |
dont know how different the engines are between the 3.8(jk) and 3.7(kj) but heres a company that makes a supercharger for the jk. http://www.rippmods.com might work. a little pricy though |
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| Author: | ONECRUNCH [ Thu Jan 17, 2008 9:28 pm ] |
| Post subject: | |
To me that is a ton on money for a SC setup. I wanted to do this on my Dakota 4.7 and I was completely sticker shocked. I did not see a mention of fuel upgrades either. Find it hard to believe the Stock injectors and pumps could adequately meet a safe demand. |
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| Author: | rescu2000 [ Mon May 12, 2008 4:03 pm ] |
| Post subject: | |
I've seen a lot of the supercharger discussions and I have a lot of experience with Turbo Dodge vehicles. I agree that the piston issue is a concern, but I keep hearing about the "composite intake" being a concern. I seriously doubt that. most superchargers are MILD pressure compared to turbo vehicles. I've run 21psi in my turbo dodges before and some run 30+. Street Superchargers (which I admint I am not experienced with) appear to be less than 7 psi. If you have ever seen the plastic box that the Shelby Daytona's used for 14 PSI, you'd laugh about these composite intake comments. That Shelby box was thin plastic. As for tuning the compuer and such, there are "poor man" methods for doing this. If your boost is 2-3 psi, the computer will probably adjust for it from the factory based on feedback from the O2 sensor. Another method? Add a cold start fuel injector with a pressure switch (adjustable 0 to 30 psi). You can then have it add fuel when boost kicks in. You may also be able to add a rising rate regulator that adds fuel with boost (I've never used one of these though) |
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