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Discussion Starter #1
We are the owners of a new 2013 JKUR, billet and manual transmission. We like the car but the gas pedal response must have been designed by lawyers. Not only is the gas pedal way too stiff but it also has a quarter to half a second lag/delay (drive by wire). This removes much of the fun of manual transmission driving. Heel and toe and double clutching are clumsy maneuvers with this setup. The whole car feels sluggish despite the new 3.6l engine. Our 2000 TJ four banger is almost more fun to drive. What to do?

I searched the forum and found several related threads. First, the removal of the inner spring in the gas pedal assembly. I performed the "spring-ectomy", a simple enough process with the provided info. The feel of the gas pedal is better. The electronic delay is still there of course.

How are you guys dealing with this? Can the gas pedal response be reprogrammed? Anybody using the Sprint Booster remapper?
 

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Mine feels fine? Little to no lag although I'm not usually stepping on it and doing gradual acceleration. But I feel like when I want the power it opens up quick enough. I'd say a programmer will help you out like diablosport or sprint booster forget who has them for the 3.6.
 

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Seems like they added a bunch of flywheel weight to the Pentastar. Watch the way the RPM climbs a little and holds as you clutch. Its great for stall resistance but can make an engine feel "lazy". I didn't think it was something that could be tuned out, the responses are interesting.
 

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Seems like they added a bunch of flywheel weight to the Pentastar. Watch the way the RPM climbs a little and holds as you clutch. Its great for stall resistance but can make an engine feel "lazy". I didn't think it was something that could be tuned out, the responses are interesting.
That's not new to the 3.6. I drove a Tj for 10 years and my 07 was horrible at first. I could not get used to the lazy throttle. Correctly tuned and running the SB. Expensive two upgrades but less than a regear.
 

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I noticed it the first week or so of driving back and forth to work. I rather like it as it is, and it seems deliberate, not accidental.
 

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If you just got it, the throttle and power delivery is subdued by the computer until a break in period is reached. I don't know what algorithm they use, but I sure noticed it on my Hemi Grand Cherokee the first 5,000 miles. Now at 20,000 miles it feels like it has an extra 100hp in comparison. My 2012 JK I bought used but feels soooo much more powerful than what I recall when test driving new ones in 2012. It's such a difference that at first the Pentastar felt no different than a 2011 3.8 I also looked at.

That said, the computer adjusts throttle inputs based on your driving habits and will adjust over a short time. Again, if yours is new give it some time to get past the break-in period and see if it changes. If it's really bad from a pull-into-traffic situation though, that's not good and you need to make a dealer visit for inspection.
 

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Discussion Starter #9
Thanks for all the responses. We have only 800 mi on it. It might improve down the road but the engine feels like it has 285hp once you step on it (if compared to the 300hp MDX we had before). But with the factory programming it is almost impossible to blip the throttle quickly during heel and toe. If it does not improve by 1000mi I'll try the sprint booster. It looks like a simple reversible change.
 

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BManZ makes a great point.. Also, kjeeper10 makes a great point for a long term solution. You must have the 3.21 final gears.. I know all about it! .a..well, did. Much less lag after the regear, even despite the added unsprung weight and resistance. Happy jeepin!
 

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I have a 13' sport with 3.73s. Its an auto with 3200 miles. The throttle lag is by far very annoying. You give it gas an it goes no where. You practically have to mid throttle off the line to get it to wake up. But then it over does it and your at 4k rpm. I dont know what the break in period is but if it doesnt correct itself soon i will purchase the sprint booster. When you have power like the 3.6 is suppose to have it should be there.

Got to be honest so far with the 50% drive train loss, the transmission hunting and the other build quality problems that i didnt have with my two TJs, im having a bit of buyers remorse.
 

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I finally got a JKU sport a few weeks ago and I agree it feels sluggish until you put it 'petal to the metal' and mine is an automatic. I drove an '06 manual Tacoma for 5+ years and it was similarly sluggish until I put a K&N air filter on it and it improved greatly.. However, I wouldn't suggest putting a K&N on your Jeep IMHO.
 

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The first 25% of the pedal seems like wasted space. But I have not hit 5000 miles yet, so I'm hoping it will get better (yes, I picked up my Jeep 9 months ago...I don't drive very far).
 

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Bullydog gauge tuner 40410, magnaflow 15160 are the only upgrades I've done to mine since I got it 2 months ago and my throttle is super touchy. With the gauge tuner you can actually adjust the throttle response. Check into one of those.
 

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Methinks you all bought the wrooong vehicle if yer lookin' fer a hot-rod... :hide:
 

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Methinks you all bought the wrooong vehicle if yer lookin' fer a hot-rod... :hide:
Well there's two conversations going on here. Some people think he's talking about lack of horsepower. What patreb is talking about is the delay in response between pushing the gas pedal and the engine actually getting that input and revving up.

I noticed this too when I got my 2013 JKR and still notice it 7,600 miles later. It's just how the silly drive by wire setup works in the Wrangler unfortunately.
 

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Wait! JKUR? 4.10's? Hmmmmmm.. Oh, and two baby kittens ..now, dead ;)
I was about to ask why people were giving advice about his car on a jeep forum, but this clears it up. :)
 

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I got a 13 jkur 3 weeks ago (auto, 4.10) and the throttle is a bit of a joke. I know about the "learning curve" of the computer, as well as the rheostat properties of the electronic throttle. But with electricity traveling near speed of light I simply cannot buy the argument that its a slower response than a cable. Think about how fast you can type and the letters show up on the computer screen. The throttle signal is going a foots distance to the computer which should render a response much quicker than the current setup is producing.

Here's my theory- (heeeere weeee goooo! Lol) What would slow a signal? Additional processes would. Things that are being calculated before the signal is allowed to make a measurable impact on the throttle. For example the systems which have the active anti swerve are using extra parameters (speed, rpm, brakes) to check sensors and report back to the processor before the throttle signal is processed. It shouldn't take long for these checks to run, but I doubt our cars have 2gb RAM and an i5 doing the calculations (honestly they should...). Receiving multiple inputs simply bogs the processor for that split second or which equates to us noticing a delayed response. Again... pure chaos theory stuff so I have no proof for any of this. Begin poking holes in my theory.
 
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