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| Supercharged liberty engine? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=4&t=52600 |
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| Author: | UtahBoy [ Sun May 09, 2010 9:07 pm ] |
| Post subject: | Supercharged liberty engine? |
Does anybody know if a super charger has succesfully worked in the 3.7 liberty engine, i have read many forms about the supercharger destroying the piston rings, i know that they are too high, but are we able to get forged pistons and a different camshaft in it? i plan on doing the SFA with 35s on it and i just want more power to push them!!!!  i mean who doesnt like more power!?!?
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| Author: | mag03kj [ Sun May 09, 2010 9:11 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
SFA? Posted in the 4x2 thread? 
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| Author: | GeekyJeep [ Sun May 09, 2010 9:40 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
its my understanding that you have to replace the pistons with forged pistons and get a supercharger from a 4.7l magnum engine ( dodge ) |
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| Author: | Twack [ Sun May 09, 2010 9:45 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
geeky is correct the piston rings in the 3.7 are to close to the top of the piston and cant take any boost. Kenne bell made a roots supercharger for the liberty for 6 months then pulled it from production becasue of the piston issue. It is possible with some aftermarket forged pistons, but then we are talking real big $ numbers |
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| Author: | JeepinJarhead03 [ Sun May 09, 2010 10:10 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
bout 700 bucks for an overhaul kit with forged pistons, 1300 for master overhaul w/ forged |
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| Author: | bmrrwolfe [ Sun May 09, 2010 11:06 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
That would be awesome! Be sure to let us know what you end up doing!! |
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| Author: | tjkj2002 [ Sun May 09, 2010 11:27 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
So with the rebuild using forged pistons,then the supercharger kit,and all sorts of other mods your looking at least $6000+ if you do all the work yourself. A little more $$ and a V8 can be installed.With little mods the 4.7 will drop in almost perfectly if you have the 45RFE trans but some wiring will be needed which will be the bulk of the cost. |
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| Author: | GeekyJeep [ Sun May 09, 2010 11:35 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
mind giving some specfics on that TJKJ? what kind of wiring and what kind of modding would be necessary for the 4.7? I read somewhere else the bit about the superchager from a 4.7 being useable on the 3.7 which now that youve said its a v8 makes absolutely no sense! arent the superchargers a replacement for the intake manifold? anyway.. i find the whole topic interesting.. |
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| Author: | JeepinJarhead03 [ Mon May 10, 2010 2:38 am ] |
| Post subject: | Re: Supercharged liberty engine? |
you're probably thinking of a roots blower, they mount to the intake, and usually make it quite difficult to see that theres even an intake under it superchargers (like a paxton) mount as an accessory like an alternator or AC compressor does, then is piped to the intake with tubing similar to the aluminum BDS or whatever cold air intakes use, |
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| Author: | UtahBoy [ Mon May 10, 2010 1:51 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
SFA. Is a solid front axle swap! no more IFS! Ask rocklizardfabrications.com about it! I have an 05 and will have it payed off this year! nice to have that payment out of the way! so my next plan is to get the engine all tricked with! and then the SFA. but if i cant do the supercharger i might as well just do the exhaust, Headers,Magnaflow Cats, and what ever muffler i want. oh and not to forget the CIA and the fastman throttle body. also get it chipped. but i was just wondering.
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| Author: | Twack [ Mon May 10, 2010 5:02 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
UtahBoy wrote: SFA. Is a solid front axle swap! no more IFS! Ask rocklizardfabrications.com about it! I have an 05 and will have it payed off this year! nice to have that payment out of the way! so my next plan is to get the engine all tricked with! and then the SFA. but if i cant do the supercharger i might as well just do the exhaust, Headers,Magnaflow Cats, and what ever muffler i want. oh and not to forget the CIA and the fastman throttle body. also get it chipped. but i was just wondering. I dont want to burst your bubble but all those things wont add up to even +10whp. In all honesty just get an ebay intake or a nice filter for the stock box, and then just get a muffler to bolt on underneath with a turn down and you will be happy. headers, cats, and the fastman tb are not going to add power. But if you do buy them, you should put it on a dyno and youl see im right. |
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| Author: | JeepinJarhead03 [ Mon May 10, 2010 6:05 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
Actually, the TB is worth roughly 28hp 19ft/lbs at 4020-4125 over stock on the dyno all stock 3.7's drop 30 hp just over 4000 rpm because they choke part of the issue is the torque limits via the engine/power train electronics skip the chip, visit B&G and get reprogrammed replacements for ecm/tcm keep the stock airbox, get with LTT for a CAI mod for the stock airbox and get a good drop in filter |
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| Author: | UtahBoy [ Tue May 11, 2010 11:14 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
well from everthing I have read about the headers and exhaust i wil getting a little more horse power. not like i was expceting 100hp increase. |
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| Author: | UtahBoy [ Tue May 11, 2010 11:17 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
and also to add what is B&G? what web site do i go to? |
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| Author: | GeekyJeep [ Tue May 11, 2010 11:22 pm ] |
| Post subject: | Re: Supercharged liberty engine? |
UtahBoy wrote: and also to add what is B&G? what web site do i go to? http://www.bgperformancepcm.com/ they reprogram your jeeps computer.. theyre not cheap theyre in michigan.. unless i found the wrong b&g |
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| Author: | JeepinJarhead03 [ Wed May 12, 2010 12:27 am ] |
| Post subject: | Re: Supercharged liberty engine? |
That's the correct B&G no they aren't cheap by any means However, the stock electronics has torque management configurations that prevent the engine outputting numbers over certain stock limits, so flatten the curve as you may, which increases seat of the pants, and power through the curve, but with the stock comps, you simply won't go over the peak allowed before it rains on your party i typically only suggest it to people who actually are dead serious about lifting numbers without them, if you simply look at the peak figure on the dyno, what twack said about no benefit is true however if you overlay the stock curve with the modified curve, bolt on's it will lift and flatten it, the crash at 4k didn't go away until the TB, i had originally thought it to be an ignition/spark/fuel issue until we dynoed a 04 kj that was in the parking lot bone stock and it had the same 30hp drop at immediately after 4k once the stock management numbers are reconfigured it's a different ball game, but i did throw on a stock TB and redyno it awhile back out of wasteful curiosity to see if it would dip at 4k again, and it did and I hate when I get curious like that because it takes a few days and a few hundred miles for it to run correctly after a swap and before a dyno, and another few days and a few hundred after swapping back I actually need to get it back to programmer and up the idle 50 rpm it's knocked off on me a time or two since it's warmed up but the way I look at it, you are by no means limited to about 75hp at 2k rpm by any means 
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