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Old 04-01-2010, 09:34 AM
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Question About Hemi - is this typical??

All - just have a question about the Hemi. I don't have much experience with this engine, so what I am feeling might be normal. It is kind of hard to explain, but it is like the engine has a hesitation feeling when holding a steady speed or that it is searching for a gear to be in, although it doesn't feel like the tranny. Is this just a symptom of the MDS???

The Jeep only has 1700 miles on it - is it still learning or getting "broken in"??

Any input would be much appreciated.
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Old 04-01-2010, 09:41 AM
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Re: Question About Hemi - is this typical??

Probably MDS, or there is a slight hesitation in the electonic throttle. That will never go away.
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Old 04-01-2010, 09:44 AM
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Re: Question About Hemi - is this typical??

ETC is a bitch. Its normal.
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Old 04-01-2010, 09:47 AM
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Re: Question About Hemi - is this typical??

I had that feeling until I used the canned tune. I used both the flashpaq and the predator and they both were game changers in my case. A world of difference but I think that the difference comes from different settings in the tranny.
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Old 04-01-2010, 09:54 AM
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Re: Question About Hemi - is this typical??

Rvtifer is right on, IMO. I use both tuners also, and they each have their own strong and weak point. They are definitely game changers. I also added the Sonnax line pressure booster to the 545RFE transmission. After it (the tranny) got used to it being there it also really helped. As said above the MDS gives you a "bump" when going on and off, and also the torque converter clutch plays a part. I have also found that most of this stuff happens in the 30-50 mph range. One other thing, in this range the tranny wants to be in 4th (first overdrive gear), but sometimes the load/RPM won't support this and the tranny starts hunting, causing the MDS to start hunting. I think mine is about as good as it can be now. IMO, the Flashpaq has the best shift schedules and MDS enhancements to help improve everything.
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Old 04-01-2010, 10:06 AM
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Re: Question About Hemi - is this typical??

Have you replaced the intake (tract) to get rid of that silencer thing attached to the TB and air filter? I noticed it helped a great deal in reducing it and yeah, I would think (and can't wait to get) the 'tuner' would help a lot, as well. If you went a step further, going to some headers and good exhaust probably would help the driveability, as well...It is annoying for sure and makes it feel like it doesn't have the power it does and wonder if something is wrong.
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Old 04-01-2010, 10:30 AM
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Re: Question About Hemi - is this typical??

All - thanks for the responses - I kind of figured everything you all are telling me, but not having driven another one for more than a few miles and not driving that one on the highway didn't give me anything to compare to.

Tuner will be down the line.

But in the meantime, CAI was delivered today and Magnaflow catback is on its way!!
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Old 04-01-2010, 11:42 AM
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Re: Question About Hemi - is this typical??

The engine tries to hard to keep the MPGs up.. the hesitation is from too low RPMs and too high of a gear.
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Old 04-01-2010, 11:45 AM
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Re: Question About Hemi - is this typical??

I reset my electronic throttle like every other day or I get dead spots in the throttle.




Here's the steps you need to follow:
1. Find an unused section of road with a good spot to pull-off/turn-around.
2. Pull off of the road and shut your car off.
3. Turn your key to the "On" position (but don't start the car), and wait for the 'idiot' lights to go out.
4. Press down on the accelerator, and let it back up.
5. Turn your car off.
6. Re-start your car and cruise up and down the road testing your throttle responsiveness.
Depending on how fast/slow you do the 4th step, your throttle will either become more or less sensitive/responsive.
Repeat steps #1 through #5 as needed until you're satisfied that your throttle response is as good as it's going to get.

Remember these things 'learn' how you drive so if you drive like Grandma for a few days, it's adjusts accordingly.
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Old 04-01-2010, 12:20 PM
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Re: Question About Hemi - is this typical??

Quote:
Originally Posted by blackpepper View Post
The engine tries to hard to keep the MPGs up.. the hesitation is from too low RPMs and too high of a gear.
That's exactly what it feels like
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Old 04-01-2010, 12:23 PM
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Re: Question About Hemi - is this typical??

Swagga - thanks for the info. My X5 has a similar process to reset the learning mode. Unfortunately (for now) the wife is driving the GC so it will probably drive like this until I take it over. Either that or I will just have to reset it every time I am driving it.
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Old 04-01-2010, 11:33 PM
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Re: Question About Hemi - is this typical??

Push the tow/haul button...It will change the shift points and stay in a lower gear longer. You can also use Auto-stick and keep it in 4 until you go over 60...then put it back in D for the fuel economy benefits

Both of the above will disable MDS.
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