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post #1 of 21 Old 03-19-2010, 02:51 PM Thread Starter
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Throttle response?

I am wondering if anyone else has noticed the extremely slow throttle response on their JK. Mine will rev up to around 3000, and return to idle seems to be very slow. Loaded or unloaded! Not good for off road use! And what possible fixes, without getting into aftemarket programmers.
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post #2 of 21 Old 03-19-2010, 05:29 PM
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First off, Welcome. I have heard that most programers or the Sprint booster will fix this problem, but that is just hear say, I don't have any experience with either. Good Luck with your quest.

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post #3 of 21 Old 03-19-2010, 05:50 PM
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post #4 of 21 Old 03-19-2010, 07:08 PM
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Quote:
Originally Posted by stillovemycj View Post
I am wondering if anyone else has noticed the extremely slow throttle response on their JK. Mine will rev up to around 3000, and return to idle seems to be very slow. Loaded or unloaded! Not good for off road use! And what possible fixes, without getting into aftemarket programmers.
The slow return to idle is to meet EPA requirements.

/jl

Healthy is merely the slowest possible rate at which one can die.
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post #5 of 21 Old 03-20-2010, 10:16 PM
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Quote:
Originally Posted by John L View Post
The slow return to idle is to meet EPA requirements.
Really... please elaborate.
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post #6 of 21 Old 03-20-2010, 10:24 PM
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Originally Posted by ZOSO-Green View Post
Really... please elaborate.
X2 I'm curious whether or not I'll have emissions issues if I run the superchips or something similar.

Not to mention it's frikkin annoying



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post #7 of 21 Old 03-20-2010, 11:03 PM
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Quote:
Originally Posted by stillovemycj View Post
I am wondering if anyone else has noticed the extremely slow throttle response on their JK. Mine will rev up to around 3000, and return to idle seems to be very slow. Loaded or unloaded! Not good for off road use! And what possible fixes, without getting into aftemarket programmers.
X2 on this issue- but I have become used to it.

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post #8 of 21 Old 03-20-2010, 11:15 PM
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I think it's annoying too. I've been using the Superchips and the throttle response is much better without it. I disabled it to go to the dealership, and I've left it off for a week because I'm going back on Friday. And I can really notice the difference. I tried to floor it to block off a car from cutting in front of me and I could not do it because he was already in front of me before the throttle kicked in.
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post #9 of 21 Old 03-20-2010, 11:18 PM
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post #10 of 21 Old 03-20-2010, 11:43 PM
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Originally Posted by CDavisJK View Post
I think it's annoying too. I've been using the Superchips and the throttle response is much better without it. I disabled it to go to the dealership, and I've left it off for a week because I'm going back on Friday. And I can really notice the difference. I tried to floor it to block off a car from cutting in front of me and I could not do it because he was already in front of me before the throttle kicked in.
With mine (6 speed manual), I don't have any problem getting it to throttle-up. It's just that it seems like it takes a second or so for the engine to throttle back down to normal. One thing I've noticed with my JK is that it used to idle right under 1,000 rpm's. Lately it is idling lower- maybe around 700- 800 rpm's.

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post #11 of 21 Old 03-21-2010, 10:21 AM
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Quote:
Originally Posted by ZOSO-Green View Post
Really... please elaborate.
CFR title 40 section 86.000-8 states:

(4) The air to fuel ratio shall not be richer at any time than the leanest air to fuel mixture required to obtain maximum torque (lean best torque), plus a tolerance of six (6) percent. The Administrator may approve a manufacturer's request for additional enrichment if it can be shown that additional enrichment is needed to protect the engine or emissions control hardware.

If you rev a motor and snap the throttle back to idle it creates a rich condition spike. This spike is in violation of the above text, therefore the mfgs implement the software driven idle speed drop coding in the ECM.

/jl

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post #12 of 21 Old 03-26-2010, 11:36 AM Thread Starter
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Ok. Looks like I got my answer with the EPA deal. I have planned on a programmer anyways. Down the road! I have become used to it already too. I could also see that the slow reactoin to decrease engine speed would keep the jerking down to a minimum, in a low range situation. So maybe it is a good idea. But a snappy throttle is always nice to hear and feel!!!! Also, I notice that my 2nd gear shift seems to be out of synch. Has tendency to grind a little from 1st to 2nd, but not in any other gear. I am going to get it in to be looked at, but was wondering if anyone elses trans does this?
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post #13 of 21 Old 03-26-2010, 11:37 AM Thread Starter
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One more questin. What exactly is a "Sprint Booster"?
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post #14 of 21 Old 03-26-2010, 12:26 PM
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post #15 of 21 Old 03-26-2010, 02:38 PM
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Quote:
Originally Posted by John L View Post
CFR title 40 section 86.000-8 states:

(4) The air to fuel ratio shall not be richer at any time than the leanest air to fuel mixture required to obtain maximum torque (lean best torque), plus a tolerance of six (6) percent. The Administrator may approve a manufacturer's request for additional enrichment if it can be shown that additional enrichment is needed to protect the engine or emissions control hardware.

If you rev a motor and snap the throttle back to idle it creates a rich condition spike. This spike is in violation of the above text, therefore the mfgs implement the software driven idle speed drop coding in the ECM.
Very interesting post!

I was wondering why my jeep did that, really pisses me off.
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post #16 of 21 Old 06-27-2014, 11:07 PM
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Programmer/Superchip?

I have had my 07 wrangler for 5 years now and I have not gotten used to RPM returning to idle so F'ing slow.. I HATE it.. i have the sprint booster.. it seems to make some difference in response but not really worth the money.. and it makes no differece in RPM coming back down at all.. will anything at all fix this.. I don't care about emissions ... Ill plant a tree every time I drive if its what I have to do to fix it... I'm seriously ready to tear the 4.0 outta my Cherokee and stuff it in there..
Someone mentioned a programmer.. would I be able to fix it that way? Someone also mentioned superchips?,will that fix it 100% or just kinda?? I don't want to spend any money unless it's 100% better.. like an older jeep.. waaaay back when they had a straight six and a throttle cable.
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post #17 of 21 Old 06-28-2014, 05:04 AM
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Throttle response?

Sprint booster plus SC throttle map. 07/6 speed, 2 door w/ heavier 35's.
Moves along just fine on road.
I absolutely hated acceleration stock driving a TJ for 10 years.
My only gripe is off road. It can get very jerky if I don't stay on the brakes lightly. That and I lost the cord that adjust the SB settings and it's stuck on high lol

I can't say whether the RPM return got better or i just got used to it. I'm thinking the latter and it actually helps maintain rpm when shifting.




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post #18 of 21 Old 06-28-2014, 10:51 AM
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Quote:
Originally Posted by kjeeper10 View Post
Sprint booster plus SC throttle map. 07/6 speed, 2 door w/ heavier 35's.
Moves along just fine on road.
I absolutely hated acceleration stock driving a TJ for 10 years.
My only gripe is off road. It can get very jerky if I don't stay on the brakes lightly. That and I lost the cord that adjust the SB settings and it's stuck on high lol

I can't say whether the RPM return got better or i just got used to it. I'm thinking the latter and it actually helps maintain rpm when shifting.




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Why do you have both? Mine seems responsive enough with just the SC throttle settings. Any more aggressive would make it tough to drive on rough terrain.
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post #19 of 21 Old 06-28-2014, 11:36 AM
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Sprintbooster was first. Later came the tuner. Like said ... I lost the cord that goes to the SB. Never removed or tried changing anything.


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2007 JKR | PSC Big bore box | Rock Krawler 3.5" x-factor arms l SteerSmarts YETI track bar, tie rod, no drill flipped drag link, Griffin | Synergy frame brace | 37x12.5x17 Nitto RG's | Dana front DS | Fox IFP shocks | Artec front armor kit/Currie JJ's | Teraflex rear axle bracket | EVO Rockstars | Ridged D's, A pillar mounts | VKS sliders l Trek Armor seat covers | Superchips/Sprint booster | Savvy half doors w/ Bestop uppers
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post #20 of 21 Old 06-28-2014, 12:22 PM
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Quote:
Originally Posted by kjeeper10 View Post
Sprintbooster was first. Later came the tuner. Like said ... I lost the cord that goes to the SB. Never removed or tried changing anything.


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Can you just remove the sprint booster? Or are you missing something to hook the factory pedal wiring back up?
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post #21 of 21 Old 06-28-2014, 01:23 PM
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I can and will eventually. Both if I decide to regear.
I lost the wire that selects the 3 settings. Been wireless for 2 years.



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2007 JKR | PSC Big bore box | Rock Krawler 3.5" x-factor arms l SteerSmarts YETI track bar, tie rod, no drill flipped drag link, Griffin | Synergy frame brace | 37x12.5x17 Nitto RG's | Dana front DS | Fox IFP shocks | Artec front armor kit/Currie JJ's | Teraflex rear axle bracket | EVO Rockstars | Ridged D's, A pillar mounts | VKS sliders l Trek Armor seat covers | Superchips/Sprint booster | Savvy half doors w/ Bestop uppers
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