SC, 5.7L Hemi or 5.3LS?? - JeepForum.com
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post #1 of 78 Old 01-20-2012, 09:26 PM Thread Starter
Pilot2010
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SC, 5.7L Hemi or 5.3LS??

Which to choose? My 2011 Rubi is a daily driver - half interstate and half stop and go. Trails here in CO and in UT in the summer, nothing too tech, but learning as I go.

The 3.8 is joke going up into the mtns and on flat as h3ll Wyoming highways.

I read good comments about the HP and fuel economy on the 5.3LS....

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post #2 of 78 Old 01-20-2012, 09:30 PM
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I'd go 5.3, the fuel economy is better then the hyped up, over priced hemi.

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post #3 of 78 Old 01-20-2012, 09:51 PM
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I'd vote for the 5.3. That's what I'm planning on doing....sometime.

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post #4 of 78 Old 01-20-2012, 11:22 PM
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the 5.3 is a great engine you'd love it

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post #5 of 78 Old 01-21-2012, 01:07 AM
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Hi everyone,

Here is an old video of our 5.3 "proof of concept" LS JK. It has been on the road with an LS 5.3 for nearly two years. It has OE cruise control, tap shift for the GM 6 speed auto and all the instruments, HVAC, etc. work properly. You will notice this JK does not have a PRNDL on the dash and that is because it was originally a manual transmission vehicle; we support the PRNDL on automatic JK's.


We have come a long way in the last couple years with our kit but I can say a little about this 2008 JKU X.

It has about 30,000 miles on it with the LS 5.3. It has the original radiator, driveshafts, transfer case and rear exhaust section. This LS engine came from a 2009(oops I say 2007 in the video) Chevy truck and had 75,000 miles on it when installed, it now has over 100,000 miles on it. This engine has used no oil between it's 5,000 mile oil change intervals. It is emissions compliant and is OBDII tested each year.

This LS JK has AFM and averages over 20 mpg on the highway. I have had this JK on the Rubicon in near zero temperatures. I have run this JK in Death Valley with outside temps pushing 120 degrees with the stock radiator.

I drove this JK across the country a couple times, it cruised comfortably at 80 mph hour after hour through TX. Driving uphill on the highway or into strong headwinds simply doesn't matter anymore.

The 5.3 has proven to be extremely reliable. One advantage of our install is even if the Jeep electronics fail the LS will continue to run in a stand alone mode This JK has proven so reliable my wife chooses to drive this JK with our newborn. We have been through ice storms and heat waves in this JK and she feels safer in it then she does in the fully loaded 3.8 JKU Rubicon I bought her. She refused to drive the 3.8 Rubicon after trying to merge into 75 mph traffic on a uphill highway on ramp. (Now that Rubicon has a 400 hp LS and she finds it difficult to keep the speed down)


Please check out our videos and those of our customers. After driving our 5.3 LS JK John Currie has requested we install one in his JK. The 6.2 VVT JK's are a blast to drive and still get good mpg. We are currently working on an 800 hp blown JKU with Rock Solid that should make a good DD.

Thanks Robbie.

MoTech
LS Specialists
500 South Buffalo Drive, Las Vegas NV 89145 702-491-7710
www.LSWrangler.com
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post #6 of 78 Old 01-21-2012, 08:55 AM
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Super charger would be the easiest and cheapest to do. From what I have read its worth doing a RIPP SC over a Hemi. Both produce close to the same HP and torque
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post #7 of 78 Old 01-21-2012, 09:38 AM Thread Starter
Pilot2010
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Thanks Robbie. I sent a quote request to your website. The "bullet proof" rep of the 5.3 is great. I can't seem to forget the tire chirp from the 6.2video you have though.... Can't wait to see what an 800hp JKU has to say!
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post #8 of 78 Old 01-21-2012, 12:02 PM
VEGASROBBI
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Quote:
Originally Posted by fmfa0801 View Post
Super charger would be the easiest and cheapest to do. From what I have read its worth doing a RIPP SC over a Hemi. Both produce close to the same HP and torque
Each has it advantage. I have driven Hemi's and SC's back to back and this was not my impression. The Hemi's I have worked on and driven have all had good power, the vvt motors especially pull hard. The Hemi's are also the easiest to integrate into the JK, an advantage over the LS and SC.

A properly tuned 5.3 can put down 300 RWHP with the 6l80. The 6l80 is a clutch to clutch auto with low friction and diverse gear spacing. This alone makes the 5.3 feel more powerful. With the 5.3 there are no flat spots, hesitations, whining or overheating. The 5.3 is emission compliant in all 50 states when set up properly. The LS engines are so smooth and refined you would think you are driving a stocker until you get into it. We use hydraulic motor mounts so there are no vibrations or resonances.

Value. A lift out 5.3 with trans runs in the $2-3k range. There is 40-50 hours of installation time which is a disadvantage compared to the SC. The Hemi requires the steering column to be removed and the firewall cut and in most cases hammered in. The Battery is relocated and the critical heat shield between the engine and TIPM is removed. Additional cooling outlets are required with the Hemi to reduce positive engine compartment pressure. The Hemi is heavy and requires suspension mods. The small, light LS does not need these mods. The engine compartment remains stock and the TIPM does not melt.

GM built the 5.3 tough for their trucks. We find an LS 5.3 wiill deliver 250-300,000 miles of trouble free service. Our experience is the cast iron Hemi's reliability degrades at 100,000 miles, it is essentially a complicated version of the LS with a lot more parts. In my opinion you would replace a normally aspirated 3.8 two or three times during the life of one LS. This is a consideration if you plan to keep your JK in the long term.

MPG - we are seeing better mpg with the AFM 5.3 than the original 3.8. The 5.3 has less hp than the Hemi's but with the 6l80 performance is similar to the 5.7. Driven conservatively with 33" or smaller tires the 5.3 will average in the high teens and over 20 mpg on the highway. I hear the SC is similar but the Hemi would lose in this category. Over the long term I feel the LS would have the lowest cost of operation especially if you consider the LS will power your JK till it starts falling apart.


Also consider I'm basing these figures on a stock tune with stock manifolds and exhaust. The LS 5.3 easily has the potential to put out 400 hp with some exhaust, mild mods and tuning. We are working with Edelbrock right now on a 5.3 Chevy truck supercharger. It will boost the 5.3 past 500 hp and I don't think a 3.8 would last long at 500 hp. The 800 hp LSx we are building is similar to the LS9. It has an Edelbrock supercharger just like the LS9 with the intercooler built into the intake valley. It is powerful and compact.

Again each has it's advantage, it depends what works best for you.

Thanks Robbie

MoTech
LS Specialists
500 South Buffalo Drive, Las Vegas NV 89145 702-491-7710
www.LSWrangler.com
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post #9 of 78 Old 01-21-2012, 09:24 PM
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Quote:
Originally Posted by VEGASROBBI

Each has it advantage. I have driven Hemi's and SC's back to back and this was not my impression. The Hemi's I have worked on and driven have all had good power, the vvt motors especially pull hard. The Hemi's are also the easiest to integrate into the JK, an advantage over the LS and SC.

A properly tuned 5.3 can put down 300 RWHP with the 6l80. The 6l80 is a clutch to clutch auto with low friction and diverse gear spacing. This alone makes the 5.3 feel more powerful. With the 5.3 there are no flat spots, hesitations, whining or overheating. The 5.3 is emission compliant in all 50 states when set up properly. The LS engines are so smooth and refined you would think you are driving a stocker until you get into it. We use hydraulic motor mounts so there are no vibrations or resonances.

Value. A lift out 5.3 with trans runs in the $2-3k range. There is 40-50 hours of installation time which is a disadvantage compared to the SC. The Hemi requires the steering column to be removed and the firewall cut and in most cases hammered in. The Battery is relocated and the critical heat shield between the engine and TIPM is removed. Additional cooling outlets are required with the Hemi to reduce positive engine compartment pressure. The Hemi is heavy and requires suspension mods. The small, light LS does not need these mods. The engine compartment remains stock and the TIPM does not melt.

GM built the 5.3 tough for their trucks. We find an LS 5.3 wiill deliver 250-300,000 miles of trouble free service. Our experience is the cast iron Hemi's reliability degrades at 100,000 miles, it is essentially a complicated version of the LS with a lot more parts. In my opinion you would replace a normally aspirated 3.8 two or three times during the life of one LS. This is a consideration if you plan to keep your JK in the long term.

MPG - we are seeing better mpg with the AFM 5.3 than the original 3.8. The 5.3 has less hp than the Hemi's but with the 6l80 performance is similar to the 5.7. Driven conservatively with 33" or smaller tires the 5.3 will average in the high teens and over 20 mpg on the highway. I hear the SC is similar but the Hemi would lose in this category. Over the long term I feel the LS would have the lowest cost of operation especially if you consider the LS will power your JK till it starts falling apart.

Also consider I'm basing these figures on a stock tune with stock manifolds and exhaust. The LS 5.3 easily has the potential to put out 400 hp with some exhaust, mild mods and tuning. We are working with Edelbrock right now on a 5.3 Chevy truck supercharger. It will boost the 5.3 past 500 hp and I don't think a 3.8 would last long at 500 hp. The 800 hp LSx we are building is similar to the LS9. It has an Edelbrock supercharger just like the LS9 with the intercooler built into the intake valley. It is powerful and compact.

Again each has it's advantage, it depends what works best for you.

Thanks Robbie
What did you think of the sc 3.8 comoared to the 5.3....
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post #10 of 78 Old 01-21-2012, 10:05 PM
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How is the 6l80e trans? I've never driven in a truck with one, I've heard it is almost identical to the allison 1000 with the clutch to clutch design, just smaller.

Any chance of a manual option?

2011 JK Rubicon 2 door 6-speed manual, 3.5" Rock Krawler Suspension lift, 1.25" Daystar body lift, 40x13.50R17 Nitto Mud Grapplers



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post #11 of 78 Old 01-21-2012, 11:01 PM
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Quote:
Originally Posted by VEGASROBBI View Post
Each has it advantage. I have driven Hemi's and SC's back to back and this was not my impression. The Hemi's I have worked on and driven have all had good power, the vvt motors especially pull hard. The Hemi's are also the easiest to integrate into the JK, an advantage over the LS and SC.

A properly tuned 5.3 can put down 300 RWHP with the 6l80. The 6l80 is a clutch to clutch auto with low friction and diverse gear spacing. This alone makes the 5.3 feel more powerful. With the 5.3 there are no flat spots, hesitations, whining or overheating. The 5.3 is emission compliant in all 50 states when set up properly. The LS engines are so smooth and refined you would think you are driving a stocker until you get into it. We use hydraulic motor mounts so there are no vibrations or resonances.

Value. A lift out 5.3 with trans runs in the $2-3k range. There is 40-50 hours of installation time which is a disadvantage compared to the SC. The Hemi requires the steering column to be removed and the firewall cut and in most cases hammered in. The Battery is relocated and the critical heat shield between the engine and TIPM is removed. Additional cooling outlets are required with the Hemi to reduce positive engine compartment pressure. The Hemi is heavy and requires suspension mods. The small, light LS does not need these mods. The engine compartment remains stock and the TIPM does not melt.

GM built the 5.3 tough for their trucks. We find an LS 5.3 wiill deliver 250-300,000 miles of trouble free service. Our experience is the cast iron Hemi's reliability degrades at 100,000 miles, it is essentially a complicated version of the LS with a lot more parts. In my opinion you would replace a normally aspirated 3.8 two or three times during the life of one LS. This is a consideration if you plan to keep your JK in the long term.

MPG - we are seeing better mpg with the AFM 5.3 than the original 3.8. The 5.3 has less hp than the Hemi's but with the 6l80 performance is similar to the 5.7. Driven conservatively with 33" or smaller tires the 5.3 will average in the high teens and over 20 mpg on the highway. I hear the SC is similar but the Hemi would lose in this category. Over the long term I feel the LS would have the lowest cost of operation especially if you consider the LS will power your JK till it starts falling apart.


Also consider I'm basing these figures on a stock tune with stock manifolds and exhaust. The LS 5.3 easily has the potential to put out 400 hp with some exhaust, mild mods and tuning. We are working with Edelbrock right now on a 5.3 Chevy truck supercharger. It will boost the 5.3 past 500 hp and I don't think a 3.8 would last long at 500 hp. The 800 hp LSx we are building is similar to the LS9. It has an Edelbrock supercharger just like the LS9 with the intercooler built into the intake valley. It is powerful and compact.

Again each has it's advantage, it depends what works best for you.

Thanks Robbie
Batteries relocated and firewalls cut on hemi swaps? I'm guessing just your shop does this, not other shops.

Martin
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post #12 of 78 Old 01-21-2012, 11:03 PM
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How much money do you have?
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post #13 of 78 Old 01-22-2012, 08:37 AM Thread Starter
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Originally Posted by Charles View Post
How much money do you have?
Enough for either option. Why?
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post #14 of 78 Old 01-22-2012, 08:48 AM Thread Starter
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The Hemi 5.7 VVT truck motor is quoted at 405hpand 425lb-ft stock. The 5.3LS you say is 300rwhp and I read about 335lb-ft. I would guess the aluminum LS weighs about 200lbs less.

So the advantage of the LS is more related to cost, known lifespan and ???
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post #15 of 78 Old 01-22-2012, 08:48 AM
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Hey Pilot, not sure where you are in CO, but I did the 5.7vvt swap and happy to let you check it out. I'm near Aspen, PM me if you are interested. I got the swap done in Boulder, and they have a bunch of different swaps you can test there as well. The LS seems like an awesome swap, but I worry a little about servicing since I'm not a mechanic. With the 5.7, I got a warranty through the dealership and they have all the parts for regular service in stock. I've got 9K miles on it now without any issues.
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