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Old 02-23-2013, 12:13 PM
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Re: Own a '12 Hemi, driving a V6 Laredo loaner. Some thoughts...

The transmissions are learning transmissions too, maybe that's got something to do with it.
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Old 02-23-2013, 02:14 PM
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Re: Own a '12 Hemi, driving a V6 Laredo loaner. Some thoughts...

It has to be in the PCM program. I just took my Overland 3.6 4x4 in for its 30k services. Up until now, my truck has just gotten it's oil changes. The tech did a reflash update, they serviced the front and rear diff's., trans fluid and filter, etc. etc. I got the truck back and it feels completely different! I'll give it some brick foot reprogramming time on the road and see if it modifies the shift points and so on.
Drove a 4 door Jeep Wrangler soft top Sport for the week. That was fun....for a day. The difference between the two is night and day!
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Old 02-23-2013, 02:27 PM
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Quote:
Originally Posted by FAUEE View Post
The rev-happy V6 makes it feel faster, as does the much lighter weight of a base Laredo compared to your Overland.

Your Hemi would annihilate the V6 Laredo in a race, but feel slower doing it because it the very linear power delivery. When I was in college I had an old Ford Explorer with the 4.0L, and one of my good friends had an Acura Integra. When you were in the Integra you'd swear the car was fast as heck, it was light, loud, low, and rev super fast. The reality was that my Explorer was actually faster up until about 60mph, but it never felt like it was fast at all (probably because it wasn't, lol). I mean, when you planted your foot on the gas, it didn't even kick you back in your seat or anything, lol.

Weight and linear power without requiring big revs will do that. They're great for an around town cruiser, but not as much fun.
Compare the two actual torque curves. Since the 6 is DOHC and variable valve timing the engineers were able to dial in a flat curve from 1400 to well over 6000. Since the 8 has a single cam, not so much.
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Old 02-23-2013, 03:54 PM
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Re: Own a '12 Hemi, driving a V6 Laredo loaner. Some thoughts...

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Originally Posted by Yadkin View Post
Compare the two actual torque curves. Since the 6 is DOHC and variable valve timing the engineers were able to dial in a flat curve from 1400 to well over 6000. Since the 8 has a single cam, not so much.
The Hemi has VVT as well since 2008.

The torque curve for the Pentastar has significant dips in its torque curve. The Hemi has increasing torque until like 4500rpm, and has over 330 torque fro like 2000rpm.
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Old 02-23-2013, 04:29 PM
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Actually the hemi has variable cam timing. Since it has one cam the intake an exhaust timing have to vary together. The Pentastar has true VVT and the intake and exhaust are varied independently. That's why it has such a flat torque curve.
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Old 02-23-2013, 05:10 PM
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Re: Own a '12 Hemi, driving a V6 Laredo loaner. Some thoughts...

Quote:
Originally Posted by Yadkin View Post
Actually the hemi has variable cam timing. Since it has one cam the intake an exhaust timing have to vary together. The Pentastar has true VVT and the intake and exhaust are varied independently. That's why it has such a flat torque curve.
Fair enough, but if you look at the dynos, it's really not all that flat. It tends to hover above and below a fixed line, but to me, I'd rather have a steadily increasing line of torque, rather than one that wobbles along trying to stay close to a horizontal line.
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Old 02-23-2013, 05:24 PM
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It's within a percent or so over a long range. For all intents that's flat. A flat torque curve means a linear power curve.
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Old 02-23-2013, 06:02 PM
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Re: Own a '12 Hemi, driving a V6 Laredo loaner. Some thoughts...

Quote:
Originally Posted by jd2012jgc View Post
Just want to start out by saying I'm not trying to start another war here .

My '12 Overland 5.7 has been with the dealer for a few days to fix some ongoing issues (cold weather start up squeal, rear shock rattles) and I've got a loaner Laredo V6 to abuse around town for a few days, so I thought I'd share some thoughts and impressions.

1. Love the Laredo's steering. Its noticeably lighter. Im not sure if they use a different system between the Laredo V6 and the Overland V8, or if its a difference in weight between the 2 engines.

2. Love the Pentastar's acceleration in city driving (the stoplight Grand Prix). The V6 actually feels "peppier" from 0-45 mph than my Overland's hemi. Again, I dont know if its gearing, or a lighter base weight, but you'd think that a bigger displacement engine with more torque should prevail at lower speeds. My Hemi actually feels like I'm accelerating a battleship from a stop compared to this Laredo's Pentastar

3. Highway speeds. This is where the Hemi pulls ahead (no pun intended). By ~75mph the Pentastar seems winded and needs a heavier foot to keep it steady at that speed. On the other hand, at 75mph, the Hemi is loafing along, and has tons of power on tap for passing/accelerating.

4. Gas mileage. Yep the V6 wins. I'm seeing about a 20% better fuel average ( by no means a scientific calculation...) in combined city/hwy.

My conclusion. I really do like my Hemi, but I wouldn't hesitate for a second to recommend the Pentastar.
I pretty much agree. I had an 06 WK Hemi and when I went to Jeep dealer for a 2012 I was 100% sure I was getting the Hemi. I drove the Hemi first and it seemed fine but there was noticeable noise in the cabin which seemed around the driveline tunnel (exhaust possibly) Then I drove the V6 and was totally surprised. Probably because I was expecting the worst. The programming seems more neutered in the V6 but prefer the smoother shifts. I hated the Hemi trans in my 06. V6 is a little better on gas. Both are slow off the line. There were 2 Bright Silver Laredo Xs I drove. V6 and V8. They were the same price. The V6 had power liftgate and ORA1 but other than that pretty much optioned the same. I was so impressed with the V6 that I went with that one.
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