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  #13  
Old 10-06-2015, 12:07 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by ajag View Post
Before the supercharger I had the gibson exhaust/Ported throttle body/K&N CAI/ and a couple other things...never had it tuned for those upgrades though...and it was louder and seemed "snappier" but not really any faster

0-60 times didn't improve really...running low 7's

right now I am tuned for 7lbs of boost ...stock the 3.6L puts down around 180HP to the wheels...when I had the supercharger installed I was putting down around 315HP...after a few dyno sessions I got it to 330HP on 7lbs

even the 3.6L setup has a fuel system robust enough to support about 500Hp at the motor and around 395-400HP to the wheels before needing a larger fuel pump.

The stage 2 3.6L RIPP kit will probably need a new fuel pump to support the 400+ AWD WHP its putting out.

GMGC has the stage 2 Rippkit installed on his 2014 3.6L and they had to dial it back to 365AWD WHP because of the fuel delivery system..

on your stock 5.7 there's no way you're running out of fuel...the 5.7 supercharged on 7 lbs of boost nets out over 420-440HP to the wheels...meaning its making well over 500+ hp at the motor on the stock fuel pump..


these supercharger kits use the stock fuel system but do come with larger injectors ....

the supercharger does look cool also
That does look slick. How much $ was it installed? Was it a long install?

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  #14  
Old 10-06-2015, 12:26 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

$6300 for the supercharger
I forget but I think it was about $1300 to install- Took 2 days and I did have a couple other things done

I spent another $1200 to get the custom gauges and have them installed ...I had a Air/fuel gauge and a boost gauge installed

Spent about $1,500-$2,000 on Dyno tuning and troubleshooting ..I had some tuning issues that needed working out

I'm close to $10,000 invested in this supercharged system
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  #15  
Old 10-06-2015, 12:29 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

Holly crap. Yeah I'm not looking to go that steep lol.

You got a dragster there.

Id like to spend no more than another $3k.

Just want some more pep. Not an all out ripper. In that case I'd just go get a 2012 or so SRT8
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  #16  
Old 10-07-2015, 09:45 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

I've got corsa, volant intake, throttle body spacer, and Diablo 93 tune on my 11 5.7. Same thing always felt like those mods did nothing. In fact, went at it with a stock 5.7 wk2 and we were even all through out. Recently did the hemifever tune and even though I now have larger/heavier tires and RRO lift, It feels noticeably quicker than before. And the only mod where I truly felt a difference.
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  #17  
Old 10-07-2015, 10:07 PM
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Quote:
Originally Posted by Nickbencze View Post
I've got corsa, volant intake, throttle body spacer, and Diablo 93 tune on my 11 5.7. Same thing always felt like those mods did nothing. In fact, went at it with a stock 5.7 wk2 and we were even all through out. Recently did the hemifever tune and even though I now have larger/heavier tires and RRO lift, It feels noticeably quicker than before. And the only mod where I truly felt a difference.
Because tune lol. The other mods help but it takes a tune to fully take advantage of it
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  #18  
Old 10-07-2015, 10:34 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by ajag View Post
I'm close to $10,000 invested in this supercharged system
Holy hell!!
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  #19  
Old 10-07-2015, 11:50 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

floon34,

You almost assuredly hurt your 0-60 time with the higher flowing Corsa. I know I did, about .5 sec, when I put the Corsa cat-back on my '14 5.7. It was expected and Corsa confirmed it. The higher flowing Corsa robbed low end but it does give it back+ in mid up. Without doing a full exhaust to include headers and then a tune a cat-back is only gonna shift the "butt" dyno around a bit. But is does sound great
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  #20  
Old 10-08-2015, 08:18 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

Simply put, it's the transmission. It's a joke. Step up to the 2014 with an 8 speed. Night and day! The 2014 3.6 puts down about the same numbers as the 2011-13 5.7 lol that's how amazing the 8 speed tranny is.
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  #21  
Old 10-08-2015, 09:13 AM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by floon34 View Post
Yes I know the 8 speed is better at laying down power. But that doesn't solve the seeming lack of acceleration my 2011 has.

In no way in hell would I ever buy a vehicle 1-2 years old. Still way too much devaluation going to happen.

My 2011 was listed as $58,677 on the window sticker. Original owner probably paid $55k out the door, assuming they got a good deal.

I bought it 3 years old for $26,500 out the door.

So someone lost over 50% of the vehicles value in just 3 years.

I just looked up KBB and it's still values around $27k after a year of ownership.

According to the numbers claimed by the manufacturers of my bolt ons I should be around 40-50hp increase. Even modestly / realistically I've got to be 30more horsepower with these add ons ... That should definitely be noticeable.

I don't expect to have a race car or even remotely close to an SRT which is geared for speed. But damn this thing isn't what I expected coming from ZJ and WJ.

I'll post some acceleration videos to see if she is really about as expected or if she maybe has a problem.
This is the whole idea manufacturers of these bolt on products have in mind when marketing. They are counting on dominance of the placebo effect on the majority of their customers. They count on the customers that buy their products to not have access to a dyno either before, or after the mods and count purely on the susceptible minds of the users that buy them. They spent good money on the bolt ons. In their minds, the mods HAVE to make the vehicle perform better. The NOISE alone from an exhaust mod gives the illusion of astonishing performace to those who possess minds susceptible to the power of suggestion. A cold air intake is far louder than the stock intake baffle system, so, it MUST be performing better. I now have to use 93 octane, according to my Diablo Tuner, after programming, so it OBVIOUSLY has to be performing better because now I have to spend more on fuel.

Astonishing.

I have a 2015 Laredo 3.6.
I want to install dual exhaust on it (has single on right rear now) because it will sound a little better and LOOK cool. I like symmetry. I am not doing this for performance. I am into aesthetics only.
I've gotten my speed need out of my system with my last vehicle. SRT8 300.

Anywho, your 2011 hemi, as I can tell you've figured out on your own, was probably running near it's peak maximum with it's stock intake, exhaust and stock programming. So there wasn't much room for improvement without breaking open the engine with bigger cam, injectors and polished heads or whatever.

I'm sorry you spent all that cash for no tangible gains. That sucks.
Supercharging, like a few gents mentioned here, is the only way to go for substantial horsepower and torque gains. That is where you will find that getting sucked into your seat experience.

The only 3 bolt on mods that potentially have any HP increase are the things that you did. But it depends heavily on how well the original setup was designed and if there is any room for improvement.
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  #22  
Old 10-12-2015, 07:59 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

I currently have a 2013 JGC 3.6 5 speed. At best its adequate. I wish it had more zip at the stop light but it is what it is. My next grand Cherokee definitely needs to be quicker, but I have a hard time thinking Of getting the 5.7. (looking at gas prices in the future). Would a stock 3.6 8 speed make that much difference in performance than what I have now, and would a 5.7 8 speed be that much better than the 3.6 8 spd. It seems like the bugs are worked out of the 8 speed, would you guys agree on that? Tks.
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  #23  
Old 10-12-2015, 08:12 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

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Originally Posted by Paul Bernard View Post
I currently have a 2013 JGC 3.6 5 speed. At best its adequate. I wish it had more zip at the stop light but it is what it is. My next grand Cherokee definitely needs to be quicker, but I have a hard time thinking Of getting the 5.7. (looking at gas prices in the future). Would a stock 3.6 8 speed make that much difference in performance than what I have now, and would a 5.7 8 speed be that much better than the 3.6 8 spd. It seems like the bugs are worked out of the 8 speed, would you guys agree on that? Tks.

Yes, the 3.6 with 8 speed makes a HUGE difference. I have read in a couple of different reviews that the 3.6 8 speed is neck and neck with the (2011-13) 5.7 6speed.
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  #24  
Old 10-12-2015, 08:13 PM
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Re: 5.7L Hemi - where's the horsepower hiding?

The 5.7 8 speed is about one full second quicker zero to sixty. 3.6 8 speed does about 7.7 secods 0-60. I heard its night and day difference compared to 3.6 5 speed and comparable to 5.7 6 speed.
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