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  #25  
Old 10-31-2010, 01:16 AM
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Re: test drive v6

Gearing kills this generation Grand Cherokee and the last generation with the 3.7L V6.
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  #26  
Old 10-31-2010, 08:52 AM
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Re: test drive v6

So what can improve the "traffic light" situation if gearing stays the same? More HP/torque? Another thing that was not mentioned is ETC that is probably tuned to deliver better gas mileage on both engines, not better "traffic light" experience.
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  #27  
Old 10-31-2010, 10:46 AM
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Re: test drive v6

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Originally Posted by Marlon_JB2 View Post
Gearing kills this generation Grand Cherokee and the last generation with the 3.7L V6.
For which we can thank the nabobs in Washington who regulate each detail of every item that's manufactured here. No wonder companies flee to China and such.
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  #28  
Old 10-31-2010, 10:55 AM
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Re: test drive v6

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Originally Posted by Lingohocken View Post
For which we can thank the nabobs in Washington who regulate each detail of every item that's manufactured here. No wonder companies flee to China and such.
Um

There is no government mandate for gear ratios.
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  #29  
Old 10-31-2010, 11:02 AM
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Re: test drive v6

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Originally Posted by Marlon_JB2 View Post
Um

There is no government mandate for gear ratios.
But there are for fuel economy. 8 speed transmission will definitely help keep everyone happier.
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  #30  
Old 10-31-2010, 11:27 AM
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Re: test drive v6

I'd say IF you are interested in a V8 vehicle it would be wise to get one soon. With the fuel economy / emission laws coming it's going to be near impossible to sell V8s with ratings of 13/19 MPG and meet the federal mandates.

This is the second golden age of muscle cars. We are reliving 1970 all over again. 1972 will be here before you know it.
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  #31  
Old 10-31-2010, 12:24 PM
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Re: test drive v6

Quote:
Originally Posted by JoeSchmoe007 View Post
So what can improve the "traffic light" situation if gearing stays the same? More HP/torque? Another thing that was not mentioned is ETC that is probably tuned to deliver better gas mileage on both engines, not better "traffic light" experience.
Best thing would be some 3.73:1 or 4.11:1 gears in the axles with a corresponding recalibration of the speedometer and of course a hit in fuel economy.
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  #32  
Old 10-31-2010, 12:49 PM
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Re: test drive v6

Is it that bad? I have the 3.7L WK and while its no performer, its not terrible, relatively speaking. And some people tend to praise the 5spd auto. I think its the W5A580 that is the weak link in the combo. The shifts are slow compared to the 545RFE. I think the 545RFE is one of the best. Too bad they dont start using the 68RFE for the hemi, probably overkill though.
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  #33  
Old 10-31-2010, 02:13 PM
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Re: test drive v6

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Originally Posted by walterhudson View Post
Don't get me wrong , I think the GC is ,by far, the best value for the money. However, I'm just disappointed that even a totally new V6 comes to market already somewhat out dated. Why no direct injection? Why no turbocharger?
I wouldn't say the Pentastar is outdated. There's space on the heads for DI, but they didn't put it on the GC due to noise- the high pressure of direct injection makes for more injector noise. As for the turbocharger, they may do that eventually, but it isn't all that necessary- I could see it offered in the place of the Hemi eventually, but I kind of like being able to run regular gas (you put a turbo on it, you're running premium).

It's actually one of the most advanced V-6 engines out there- not everything comes down to the matter of injection and the existence of forced induction. There's also weight (it's light for what it is), overall power (it's pretty good in stock trim and will get better over time), and other items to look at.
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Old 10-31-2010, 03:25 PM
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Re: test drive v6

Not having DI on the Pentastar may actually be considered an advantage over DI. The DI can be a disadvantage if you plan on keeping a vehicle a long time: carbon buildup on intake valves. The DI design precludes any fuel running through the intake valves, i.e. the fuel is directly injected into the combustion chamber at 1600+ psi just like fueling a diesel engine

Because fuel never runs through the intake valves on a DI system, over time the top side of the intake valves build up carbon deposits that affects air flow which affects power/performance. If the deposits get too high it begins to affect the complete closing of the intake valves. No matter what fuel or additive you run in a DI engine, it will never run through the intake valves and never clean off that carbon buildup; only head removal and physical cleaning ensures carbon cleaning 100%. That makes the Pentastar a better, lower-maintenance engine tens of thousands of miles down the road than a DI engine, IMHO.
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  #35  
Old 10-31-2010, 06:14 PM
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Re: test drive v6

Quote:
On my test drives, both the Hemi and Pentastar were a let down off the line. Compared to my WJ 4.7HO with 3.73 gearing (and much less weight), both versions felt a major step backwards. Once up and going, the hemi had plenty of power, the V6 was adequate but not special. Sadly, the Grand isn't the SUV stop light terror it used to be.
+1

I did drive the Hemi yesterday and is a lot closer to my '04 4.7HO. I am not talking on racing kids with noise Honda's on the trafic lights, but 3.6 for new powertrain could be better. Even the "original" ML350 runs better compared to the Pentastar. Penta + turbo and 8speed trany will be ideal combo to make me trade my 39,000 miles 04' Overland with NO payments that I love a lot.
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  #36  
Old 10-31-2010, 06:15 PM
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Re: test drive v6

Quote:
Originally Posted by Technosavant View Post
I wouldn't say the Pentastar is outdated. There's space on the heads for DI, but they didn't put it on the GC due to noise- the high pressure of direct injection makes for more injector noise. As for the turbocharger, they may do that eventually, but it isn't all that necessary- I could see it offered in the place of the Hemi eventually, but I kind of like being able to run regular gas (you put a turbo on it, you're running premium).

It's actually one of the most advanced V-6 engines out there- not everything comes down to the matter of injection and the existence of forced induction. There's also weight (it's light for what it is), overall power (it's pretty good in stock trim and will get better over time), and other items to look at.

Techno, have you heard of the ford 3.5L V-6 Ecoboost engine in the SHO, MKZ, MkT, and soon in the F-150 truck and the new Explorer. Turbo, DI, regular fuel, 17/25 mpg in the SHO and Lincolns, 355 to over 400 hp depending on the application, 350 to 390 torque depending on application at 1500 RPM, 6 speed auto. And by the way, my friend's SHO smokes my 2007 Magnum Hemi AWD [ same weight as SHO at 4200 LBS.] from all speeds while getting better MPG and using regular grade fuel.
Now that's a new up to date now excuses engine!
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