Pentastar V6 lack of torque of idle! - Jeep Garage - Jeep Forum

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Old 12-19-2014, 05:05 PM
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Pentastar V6 lack of torque of idle!

I have a 2015 JKU Rubicon HR with manual transmission. I recently discovered that I couldn't take of up a hill with my trailer attached without excessive clutch slip. The trailer was about 1500lbs and it was a steep grade. This has the stinkiest clutch I ever smelt.

Any ideas what the problem may be?


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Old 12-19-2014, 05:31 PM
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Re: Pentastar V6 lack of torque of idle!

Well it sounds like the problem is way too steep of a hill or you didn't have it in first gear (yes, I know it's pretty easy to tell what gear you're in). But if you can smell clutch, either the hill is to steep, the gear is too high or the load is too heavy. You should never smell clutch. Your only other choice is low range. The Rubies come with the lowest gear ratio you can get from the factory (4.10). Or maybe you should have considered getting an automatic.
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Old 12-19-2014, 07:03 PM
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Pentastar V6 lack of torque of idle!

My problem is the 2003 rubicon(5-speed) I traded in did the same task without issue. I got the manual thinking the lower first gear ratio(compared to the auto) would be better but I guess I was wrong. I shouldn't have to go to low range to pull out on the highway, stop shift to high range then go.

I was hoping others would chime in with a technical explanation. I am assuming the pentastar off idle has less torque than the old 4.0, I know the pentastar has it beat badly once the rpm gets to 1800-2000 and up. With my old rubicon I could give it a little throttle let the clutch out, the engine would lug down and take off once I gave it a little more throttle. My current rubicon won't do this.

Just as an example, my 99 TJ with the 2.5 would also pull this trailer up this same hill, it required much more use of the clutch than the 4.0 but it would never smoke or stink like this machine does.

I am not attacking the current machine I am looking for a legitimate discussion on this. I am starting to wonder if this type of engine characteristic is why most trucks are not available with a manual. The typical stall speed in the automatic transmissions eliminate the problem. I have never owned an automatic of my own but maybe I should have. BTW the wife's 2013 JGC overland has zero problem with the same load.


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Old 12-19-2014, 07:35 PM
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Are you starting out on a hill or is the clutch slipping with your foot off the pedal? Have you tried disabling hill start assist and trying it? Maybe HSA is working against you. Are the trailer brakes working correctly?
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Old 12-19-2014, 07:38 PM
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Pentastar V6 lack of torque of idle!

I did disable hill start assist and it improved. The clutch won't slip if I let it all the way out, it will kill the engine. Lol. I just have to slip it quite a bit until I get the vehicle moving good.


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Old 12-24-2014, 07:46 PM
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Re: Pentastar V6 lack of torque of idle!

Hill assist does suck.
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Old 12-30-2014, 10:25 PM
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Re: Pentastar V6 lack of torque of idle!

If you are starting out in 4-Low when you say low range while merging with traffic there is something wrong with your technique. No other explanation.

NC


Quote:
Originally Posted by 4wheeledarsenal View Post
My problem is the 2003 rubicon(5-speed) I traded in did the same task without issue. I got the manual thinking the lower first gear ratio(compared to the auto) would be better but I guess I was wrong. I shouldn't have to go to low range to pull out on the highway, stop shift to high range then go.

I was hoping others would chime in with a technical explanation. I am assuming the pentastar off idle has less torque than the old 4.0, I know the pentastar has it beat badly once the rpm gets to 1800-2000 and up. With my old rubicon I could give it a little throttle let the clutch out, the engine would lug down and take off once I gave it a little more throttle. My current rubicon won't do this.

Just as an example, my 99 TJ with the 2.5 would also pull this trailer up this same hill, it required much more use of the clutch than the 4.0 but it would never smoke or stink like this machine does.

I am not attacking the current machine I am looking for a legitimate discussion on this. I am starting to wonder if this type of engine characteristic is why most trucks are not available with a manual. The typical stall speed in the automatic transmissions eliminate the problem. I have never owned an automatic of my own but maybe I should have. BTW the wife's 2013 JGC overland has zero problem with the same load.


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Old 12-31-2014, 07:35 AM
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Re: Pentastar V6 lack of torque of idle!

This isn't a "technique" problem. When under load on takeoff the engine dies or it requires excessive clutch usage to get rolling. I was not the person that suggested I use 4L on take off. The problem I had with slipping the clutch was how bad it stunk to do so. The smell and smoke has almost quit now after 2k miles. I use this jeep to tow small trailers around the farm regularly just like we used our TJ, YJ and CJ's before, the previous jeeps have had no problem doing the same tasks as I do with the new JK. Maybe the "technique" of driving a manual transmission has changed.


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