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  #1  
Old 02-01-2014, 11:13 AM
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Arrow Launch Control inquiry + Introduction :)

Hello all, first post here
Received my Deep Cherry Red SRT 2014 a few days ago and I'm excited to the max !! Beautiful monster.
Just wanted to say Hi and hope to be welcomed into the SRT family !

---

I got a few questions regarding Launch Control, hope you guys can help me out :

1- How many miles did you wait before using LC ?
2- What's your best time 0-60 on stock ?
3- What settings did you use for your best time ? (LC or without ? Sport or Track ? at what RPM ?)

Thank you ^^
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  #2  
Old 02-01-2014, 03:38 PM
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Re: Launch Control inquiry

Some people will tell you not to worry about break in. It's not the hemi you need to worry about, the engine in our Jeeps is more than strong. It's the differential that needs to be set properly. If you do launches early, you're basically screwing your differential and it will lead to further mechanical issues down the road.

The jeep manual says 500 miles / 800 km is what you need to do before being overly aggressive (ie: launches). It's fine to go fast up to 70/110 range before that in bursts etc but nothing like a launch. I'd say read your manual for sure on this.

Your time is going to come down to your altitude, your tires, your pavement. Higher altitudes are getting around the 4.5-4.8 range, lower are getting under that. Your jeep gets faster though as you add miles.

if you use the exact same everything, your 0-60 time will be faster at 5000 miles than at 1000 and even faster at 10,000 miles than 5,000. People with more mileage are getting better times because their differential has set properly. All SRT's are the same way on this, the hemi is strong but how it locks up is your weakest point.

Over time you'll see faster times though.

One last thing... Stock? What is this.... stock you speak of.

I've added a catch can and exhaust set up.. but before I did the exhaust, my best was 4.2

http://srtgeek.com/2014-jeep-grand-cherokee-0-60-times/
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  #3  
Old 02-02-2014, 01:28 AM
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Re: Launch Control inquiry

Thanks for the comprehensive reply !!

I see, well I did launches after 1000km so I guess that shouldn't be a problem, right ?

Haha I plan to keep it stock for a while since I just got the beast, might wait a few months before I start playing with it ! You know, taking it slow ... haha

Btw, beautiful car (in your blog), that white coat with the snow is just 10/10
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  #4  
Old 02-02-2014, 01:40 AM
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Re: Launch Control inquiry + Introduction :)

Quote:
Originally Posted by DarkHue View Post
1- How many miles did you wait before using LC ?
2- What's your best time 0-60 on stock ?
3- What settings did you use for your best time ? (LC or without ? Sport or Track ? at what RPM ?)

Thank you ^^
First welcome to the forum! There are a bunch of really great people on here with tons of knowledge. You will really like it on here!

1. I think the first time I used LC was around 900 miles
2. 4.0 flat. I think I had a -2500 ft DA. After I put on my Borla I haven't been able to break into the 3.xx range I was kinda hoping that would happen
3. My 4.0 was with LC on at the default RPM. I can hit 4.2 or 4.3 consistently by just flooring it in sport mode.

Its amazing how much temperature-- and more specifically-- the density altitude changes these trucks. If you get a good day weather wise you are set.

Also I think JDR8 is right on the money about break-in. He knows his stuff
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  #5  
Old 02-02-2014, 02:12 AM
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Re: Launch Control inquiry + Introduction :)

Quote:
Originally Posted by 5.7summit View Post
First welcome to the forum! There are a bunch of really great people on here with tons of knowledge. You will really like it on here!
Thanks for replying

Those are amazing timings tbh !! My max until now is 4.7 sec, with 1100km break in. Then again temperatures where I live aren't really that cold and it's slowly getting warmer now.
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Old 02-02-2014, 02:18 AM
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Re: Launch Control inquiry + Introduction :)

Quote:
Originally Posted by DarkHue View Post
Thanks for replying

Those are amazing timings tbh !! My max until now is 4.7 sec, with 1100km break in. Then again temperatures where I live aren't really that cold and it's slowly getting warmer now.
What was the temp when you got a 4.7?
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Old 02-02-2014, 02:19 AM
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Re: Launch Control inquiry + Introduction :)

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Originally Posted by 5.7summit View Post
What was the temp when you got a 4.7?
Around 19 degrees Celsius (66.2 F)
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Old 02-02-2014, 02:37 AM
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Re: Launch Control inquiry + Introduction :)

Quote:
Originally Posted by DarkHue View Post
Around 19 degrees Celsius (66.2 F)
You are right on the money with a 4.7 @ that temperature! I would be very happy with that time. If you ever get a chance to drive in colder temps maybe 30-35 deg F you will notice a huge difference!!
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Old 02-02-2014, 09:06 AM
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Re: Launch Control inquiry + Introduction :)

Quote:
Originally Posted by 5.7summit View Post
You are right on the money with a 4.7 @ that temperature! I would be very happy with that time. If you ever get a chance to drive in colder temps maybe 30-35 deg F you will notice a huge difference!!
Yep !! I'm quite satisfied with a 4.7 on Stock !! Whenever the temp drops I will try to beat that. Aiming for a 4.5 on Stock !
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Old 02-02-2014, 12:59 PM
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Re: Launch Control inquiry

I've got a best of 4.0 at temps of +10*F. I've heard of guys cutting in the high 3's at warmer temps, so I've got my hopes up.
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Old 02-02-2014, 03:12 PM
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Re: Launch Control inquiry

Quote:
Originally Posted by peter2772000 View Post
I've got a best of 4.0 at temps of +10*F. I've heard of guys cutting in the high 3's at warmer temps, so I've got my hopes up.
Sweet !! Sadly it never gets below 10 *C here

Btw, did anyone notice faster speeds when on Sports Mode rather than Track ? LC+Track gives me a 4.9, while LC+Sport gives me a 4.7 ... weird .. Is it due to the traction control ? Tracks limits Traction control while Sports mode doesn't as much (right ?) .. Maybe that's why ?
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Old 02-02-2014, 03:23 PM
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Re: Launch Control inquiry

You don't need such cold temps for god/better times. I'll check and see what temps they were running at. I think the DA (density Altitude) is really important as well though.
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