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  #73  
Old 12-09-2015, 08:51 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

Comments like "go buy a Challenger" or the like are just ridiculous. When you have 360hp in any vehicle, it should feel like there's some power there. The 2015 R/T Challenger weighs more than my Jeep, according to Edmunds, so why is that a better option? Can't be the 15 additional hp. The fact is the Jeep feels sluggish, slow and under powered. I'm still new to Jeep, but find a complete lack of information in terms of real specifics. Hell, even the service manual is limited on info! What is the difference with HEMI's in different vehicles and the Jeep? Intake manifolds and cams?

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  #74  
Old 12-09-2015, 09:06 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by Kduniverse View Post
Comments like "go buy a Challenger" or the like are just ridiculous. When you have 360hp in any vehicle, it should feel like there's some power there. The 2015 R/T Challenger weighs more than my Jeep, according to Edmunds, so why is that a better option? Can't be the 15 additional hp. The fact is the Jeep feels sluggish, slow and under powered. I'm still new to Jeep, but find a complete lack of information in terms of real specifics. Hell, even the service manual is limited on info! What is the difference with HEMI's in different vehicles and the Jeep? Intake manifolds and cams?
Perhaps you are expecting too much. The HEMI powered Grand Cherokee is a 2-1/2 ton SUV capable of towing 7,000 pounds. It's not a stop light Grand Prix machine, or was it designed to be. And you don't think it has enough power?? It sure seems like it has when I hit the throttle on mine. If you want more, you should have bought the SRT.
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  #75  
Old 12-09-2015, 09:16 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

i can honestly say if you went with johan or hemifever for a tune and some air in and out, you'd find some power. its got the potential, but that's about it. if you really want to feel power, the cam and heads are the way to go. they also make matching throttle bodies and intake manifiolds... I would suggest High horse performance out of Delaware. highly recommened! 400 hp from the wheels all day!

this was the way I was gonna go, but decided on a diesel, because they're finally finding ways to tune em.

GOOD LUCK - DO IT!
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  #76  
Old 12-09-2015, 09:51 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

No, just expecting what it should feel like. Doesn't need to be a "stop light Grand Prix machine" to feel as it should. Just because it's an SUV doesn't really mean a thing. What about the X5M or the Porsche SUV's? Your point that it's an SUV is moot. And I know most people are jaded by today's hp ratings, but 360hp should still feel like something, not a sluggish boat. I guess what you feel when you hit the throttle is open to interpretation. Just like your 10 may be my 4.


Quote:
Originally Posted by billt View Post
Perhaps you are expecting too much. The HEMI powered Grand Cherokee is a 2-1/2 ton SUV capable of towing 7,000 pounds. It's not a stop light Grand Prix machine, or was it designed to be. And you don't think it has enough power?? It sure seems like it has when I hit the throttle on mine. If you want more, you should have bought the SRT.
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  #77  
Old 12-09-2015, 09:56 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by Kduniverse View Post
Comments like "go buy a Challenger" or the like are just ridiculous. When you have 360hp in any vehicle, it should feel like there's some power there. The 2015 R/T Challenger weighs more than my Jeep, according to Edmunds, so why is that a better option? Can't be the 15 additional hp. The fact is the Jeep feels sluggish, slow and under powered. I'm still new to Jeep, but find a complete lack of information in terms of real specifics. Hell, even the service manual is limited on info! What is the difference with HEMI's in different vehicles and the Jeep? Intake manifolds and cams?
The axle ratio for the older Hemi's was 3.73 compared to the much taller 3.09 ratio used currently for better fuel economy. That taller ratio adversely affects acceleration, although the 8 speed's ratios help somewhat.

My Jeep weighs almost 5200 lbs. Edmonds must have had The entire staff inside that Challenger on the scales!
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  #78  
Old 12-09-2015, 10:07 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by 2014RedHemiGC View Post
The axle ratio for the older Hemi's was 3.73 compared to the much taller 3.09 ratio used currently for better fuel economy. That taller ratio adversely affects acceleration, although the 8 speed's ratios help somewhat.

My Jeep weighs almost 5200 lbs. Edmonds must have had The entire staff inside that Challenger on the scales!
BOOM! GEARS! 3.55's or 3.73's!
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  #79  
Old 12-09-2015, 10:14 AM
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5.7L Hemi - where's the horsepower hiding?

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Originally Posted by 2014RedHemiGC View Post
The axle ratio for the older Hemi's was 3.73 compared to the much taller 3.09 ratio used currently for better fuel economy. That taller ratio adversely affects acceleration, although the 8 speed's ratios help somewhat.

Just kidding
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  #80  
Old 12-09-2015, 10:16 AM
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Originally Posted by bermie63 View Post

BOOM! GEARS! 3.55's or 3.73's!
I'd go 3.73
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  #81  
Old 12-09-2015, 10:25 AM
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Quote:
Originally Posted by overlanding View Post

The Jeep website says 3.45 ratio for the Hemi.
That's with the V6/Diesel, Hemi's get 3.09 gears in the rear.
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  #82  
Old 12-09-2015, 10:33 AM
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Quote:
Originally Posted by 14SummitHemi View Post

That's with the V6/Diesel, Hemi's get 3.09 gears in the rear.
And that right there is why the hemi feels sluggish when you compare it to a hemi challenger
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  #83  
Old 12-09-2015, 10:42 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

Quote:
Originally Posted by 2014RedHemiGC View Post
The axle ratio for the older Hemi's was 3.73 compared to the much taller 3.09 ratio used currently for better fuel economy. That taller ratio adversely affects acceleration, although the 8 speed's ratios help somewhat.

My Jeep weighs almost 5200 lbs. Edmonds must have had The entire staff inside that Challenger on the scales!

Apologies, they only state gross not curb weight.

How do I know which rear end I have? Did 5.7's come with a specific ratio? I'm 4x2. I agree, this would be a huge improvement. Was one of the first things Corvette guys did on C4's.
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  #84  
Old 12-09-2015, 12:47 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by Kduniverse View Post
What about the X5M or the Porsche SUV's?
What about them? For Christ's sake you could buy 2 Grand Cherokees for what a Porsche SUV costs. Why don't you compare it to a Ferrari Enzo?
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