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Old 04-02-2015, 09:37 PM
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V-8 acceleration hiccup?

I'm driving a 2014 JGC Limited V-8. This may be me over analyzing the situation but I'll set the scene:

Passing through a toll I accelerate moderately to ~20 mph. My lane is ending and there is a 18 wheeler 20 ft in front of me to my right. I think quickly, less pass this truck and have some fun... I put the petal almost to the floor and to my surprise I don't accelerate (for what feels like forever) but my rpms shoot up to red line and then I take off but not the put me snug in my seat acceleration. Transmission slip? Or normal? Because I've never experienced that length of no acceleration, rpm climb and lack of take off with this V-8. It usually puts a grin on my face all the time with minimal lag. Eco was on by the way.

Interested in what everyone thinks. Thanks.


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Old 04-02-2015, 09:52 PM
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Re: V-8 acceleration hiccup?

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Originally Posted by palumbo87 View Post
I'm driving a 2014 JGC Limited V-8. This may be me over analyzing the situation but I'll set the scene:

Passing through a toll I accelerate moderately to ~20 mph. My lane is ending and there is a 18 wheeler 20 ft in front of me to my right. I think quickly, less pass this truck and have some fun... I put the petal almost to the floor and to my surprise I don't accelerate (for what feels like forever) but my rpms shoot up to red line and then I take off but not the put me snug in my seat acceleration. Transmission slip? Or normal? Because I've never experienced that length of no acceleration, rpm climb and lack of take off with this V-8. It usually puts a grin on my face all the time with minimal lag. Eco was on by the way.

Interested in what everyone thinks. Thanks.


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This is Electronic Throttle Control for you. Had this happen to me when making left turn. Not a pleasant experience. '11 V6. On my old V8 ZJ when I pressed the pedal it went. Not so with WK2.
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Old 04-02-2015, 09:58 PM
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Re: V-8 acceleration hiccup?

Greetings,

Look into the the DiabloSport tuners for the WK2. I going to set mine up next week. One of functions allows to control the lag of the system.

https://www.diablosport.com

In addition, checkout the main forum for the WK2 section:

Engine Performance/Intakes/Exhausts - Jeep Garage - Jeep Forum

Lot of great stuff and you can find opinions on the Diablosport.

Best for now.
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Old 04-03-2015, 12:38 PM
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Re: V-8 acceleration hiccup?

For the OP, next time you are in this type of situation, if you have time, tap the shift lever to go to Sport mode. It seems to cut down on mysterious hesitations that you tend to notice most when you don't really want them. If you don't have time to tap the lever, rethink your strategy.
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Old 04-03-2015, 12:56 PM
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Re: V-8 acceleration hiccup?

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Originally Posted by lstowell View Post
For the OP, next time you are in this type of situation, if you have time, tap the shift lever to go to Sport mode. It seems to cut down on mysterious hesitations that you tend to notice most when you don't really want them. If you don't have time to tap the lever, rethink your strategy.
Agreed. In addition, just leave Eco mode off for 90% of the time- its much better when it comes to shifting and to be honest, the difference in mileage is barely noticeable. I only use Eco in heavy bumper to bumper traffic or navigating through some city streets.
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Old 04-04-2015, 11:46 AM
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Re: V-8 acceleration hiccup?

If you're gonna pass someone with somewhat limited space, do one of two things:

- Floor it like you mean it, without hesitation.

- Slap the shifter into sport mode before you pass. You may not need to floor it in this case, but the trans will hold the gears longer.
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Old 04-04-2015, 05:51 PM
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Re: V-8 acceleration hiccup?

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Originally Posted by SaintGermain View Post
Agreed. In addition, just leave Eco mode off for 90% of the time- its much better when it comes to shifting and to be honest, the difference in mileage is barely noticeable. I only use Eco in heavy bumper to bumper traffic or navigating through some city streets.
I will disagree with you on this one. This will vary with driving styles, the traffic types you deal with, and the layout of your roads. We get at least 2 MPG better, typically, with ECO mode vs non-ECO mode in our 2014.

However, I will agree with you on Sport mode. It does help eliminate the hesitation.
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Old 04-04-2015, 09:50 PM
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Re: V-8 acceleration hiccup?

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Originally Posted by SouthDakota View Post
I will disagree with you on this one. This will vary with driving styles, the traffic types you deal with, and the layout of your roads. We get at least 2 MPG better, typically, with ECO mode vs non-ECO mode in our 2014.

However, I will agree with you on Sport mode. It does help eliminate the hesitation.
On the highway it makes little difference while cruising. Besides the lack of any kind of lag in shift gets you up to speed quicker and more efficiently. On city roads- I can agree that it does make a difference. But really- the shift points are already quite low without Eco on. The disjointed feeling I get in Eco is not worth saving 2 MPGs or less which is why most folks in 2014 models prefer to have the option to leave it off in the first place every time they start the car.
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