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Old 07-19-2013, 12:34 AM   #1
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Improving throttle response

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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Old 07-19-2013, 12:38 AM   #2
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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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Old 07-19-2013, 03:38 AM   #3
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Old 07-19-2013, 05:12 AM   #4
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Cold air intake, and exhaust, made my jkur respond insane, banks ftw
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Old 07-19-2013, 05:31 AM   #5
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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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Old 07-19-2013, 05:34 AM   #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.
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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Old 07-19-2013, 07:42 AM   #7
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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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Old 07-19-2013, 09:11 AM   #8
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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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Old 07-19-2013, 05:56 PM   #9
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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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Old 07-19-2013, 06:37 PM   #10
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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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Old 07-19-2013, 06:39 PM   #11
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Wait! JKUR? 4.10's? Hmmmmmm.. Oh, and two baby kittens ..now, dead
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Old 08-07-2013, 04:51 PM   #12
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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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Old 08-07-2013, 06:30 PM   #13
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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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Old 08-07-2013, 06:41 PM   #14
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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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Old 08-07-2013, 06:54 PM   #15
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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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Old 08-07-2013, 08:10 PM   #16
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Methinks you all bought the wrooong vehicle if yer lookin' fer a hot-rod...
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Old 08-07-2013, 08:29 PM   #17
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Quote:
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Methinks you all bought the wrooong vehicle if yer lookin' fer a hot-rod...
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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Old 08-07-2013, 08:33 PM   #18
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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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Old 08-07-2013, 09:05 PM   #19
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Methinks you all bought the wrooong vehicle if yer lookin' fer a hot-rod...
Good point, disregard my opinion!!
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Old 08-15-2013, 08:17 AM   #20
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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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Old 08-15-2013, 08:37 AM   #21
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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 takes a full second for the horn to honk. They must be running this stuff on a Commodore 64.
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Old 08-15-2013, 08:55 AM   #22
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I have a Sport wtih 3.73 and Manual. I have only driven it 300 miles but it has taken some mastering to get it right. I am no stranger to a manual, but this thing is not easy to drive.

When you tip into the throttle in first it's way easy to get the feeling it's not doign anything and give it too much gas and over rev when letting the clutch out.

I have gotten used to it, but I have found myself getting "ahead" of the shifts (already getting back into the gas just a little before the clutch is fully back out) to compensate for the lag in response. 2-3 shifting is still a pain in the ass and I seldom get it right without a jerk.
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Old 08-15-2013, 09:14 AM   #23
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It takes a full second for the horn to honk. They must be running this stuff on a Commodore 64.
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I often wonder what exactly makes up the components of our cars' computer system. If its anything like what makes up the uConnect system we are all screwed!
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Old 08-15-2013, 09:29 AM   #24
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I'm thinking the slower response is on purpose. If it was a race car you would want it to be really quick response, but going over a rock I doubt anyone wants it to jump off the line. I did't even notice the horn delay until my buddy made a big deal about it on his Moab. I don't use the horn. I did go to honk at someone when they were texting when the light turned green and it didn't honk (have to hold it). I think it's like a cooling off period to prevent road rage. LOL
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Old 08-15-2013, 09:30 AM   #25
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It takes a full second for the horn to honk. So true! They must be running this stuff on a Commodore 64.
So that's what they do with our old computers.
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Old 08-15-2013, 09:36 AM   #26
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Don't waste any money on Sprint Booster

All it does is change the throttle input percentage signal. There is no change in "lag". Full throttle comes on earlier...just press the pedal more, same thing. You cannot speed up the signal.

The only gain is reaching a higher throttle percentage faster, so you save the speed that you can mash the go peddle. No WOT runs will improve, there is no power gain.

Any "lag" you think exists is programming.

In theory you also loose throttle control by altering the curve to be WOT sooner.
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Old 08-15-2013, 09:48 AM   #27
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It takes a full second for the horn to honk. They must be running this stuff on a Commodore 64.

Mine is really slow...I must be on the less able Commodore Vic-20
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Old 08-15-2013, 09:56 AM   #28
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I'm thinking the slower response is on purpose. If it was a race car you would want it to be really quick response, but going over a rock I doubt anyone wants it to jump off the line. I did't even notice the horn delay until my buddy made a big deal about it on his Moab. I don't use the horn. I did go to honk at someone when they were texting when the light turned green and it didn't honk (have to hold it). I think it's like a cooling off period to prevent road rage. LOL


Cooling off period. LMFAO
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Old 08-15-2013, 10:02 AM   #29
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I'm thinking the slower response is on purpose. If it was a race car you would want it to be really quick response, but going over a rock I doubt anyone wants it to jump off the line. LOL
Race car? Jumping the line? Lol, what?

I offroad a LOT and can't recall a time where I wished for poor throttle response to help me thru an obstacle in any of my previous vehicles. I'm no lead foot, but anyone whose had to navigate tight trails thru rock knows that when you need a throttle blip you NEED ONE RIGHT NOW usually to prevent rollback or to keep momentum, not in like a second or so when the computer says you can have it.

I've only had my JKUR for 3 weeks (1400 miles now) but have already put 15+ trail hours on it in 4 low. I find myself pressing the throttle further in, then backing off to the slightly-off-idle position I desire. I hope this is just due to a stiff new gas pedal. I very much look forward to when I can ever so lightly tap the gas to modulate power thru very rocky terrain. One wrong hard press of the pedal could have horrible consequences. Anyway, just my 2˘.
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Old 08-15-2013, 11:09 AM   #30
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I'm looking for a cheap factory TB to port to see if that does anything for throttle response. On my '06 Charger RT and my '09 Charger SRT there was a bit of throttle lag on those too, I opened up the front and back of the TB on a lathe and it felt like it helped throttle response.

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