2014 Grand Cherokee information - Australia - Page 1072 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Export Grand Cherokee 2011+

Reply
 
Thread Tools Display Modes
 
  #12853  
Old 01-23-2015, 04:07 AM
Member
 
Join Date: Jun 2013
Posts: 624
Thanks: 1
Thanked 23 Times in 19 Posts
Rep Power: 2178
mmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Benn0 View Post
Just went for a quick drive to get dinner, at 60kph I'm in 6th at 1500rpm in eco mode. Going up hill and pushing the pedal down 50% the trans shifts back to 4th and 2200rpm, it will hold 4th through 3500rpm, at which stage I back off the accelerator because I'm going too fast, and it shifts back up to 5th and then 6th.

That all sounds normal to me. What doesn't sound right is if you are doing 110kph in 8th and it shifts back to 7 and goes to 3-4k rpm.

Normally, engine and gear works hand in hand to maintain a set speed at optimal fuel consumption. rpm goes up to 3-4 is normal because engine, under pressure from gas pedal, is overworking to maintain speed at lower gear level, and fuel consumption increase as result. Once gear unlocked from 7 and jumps back to 8, i don't need to push gas pedal any harder to maintain the same speed and rpm drops back to around 1.5 as a result.

Gear downshift and lockin happens too when using adaptive cruise control. Owners who have ACC know that when you signal right lane change, ACC momentally increases speed evidenced by rpm spikes for overtaking. With mine, at the moment rpm spikes, gear downshift to and lockin at 7, speed does not increase momentarily due to low gear which unsettles me as, on a number of occassions, i can see car (from rear view mirror) right behind my ass. The whole driving experience on uphill and overtaking is wishy washy, lack of confidence.

Reply With Quote
Sponsored Links
Advertisement
 
  #12854  
Old 01-23-2015, 04:43 AM
Benn0's Avatar
Senior Member
 
Join Date: Oct 2013
Location: Brisbane, Australia
Posts: 2,180
Thanks: 116
Thanked 361 Times in 278 Posts
Rep Power: 18978
Benn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond repute
Garage
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by SNUKE View Post
You missed the important part, what was for dinner?
Pizza, nothing exciting, just too tired to cook.
__________________
MY14 Grand Cherokee LTD CRD - ORA2 & QL | Mopar 18" Night Fever Rims & Rock Rails | Chief Recovery Hooks & Sump Skid Plate | STMaxx 275/65R18
Reply With Quote
  #12855  
Old 01-23-2015, 04:48 AM
Benn0's Avatar
Senior Member
 
Join Date: Oct 2013
Location: Brisbane, Australia
Posts: 2,180
Thanks: 116
Thanked 361 Times in 278 Posts
Rep Power: 18978
Benn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond repute
Garage
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
Normally, engine and gear works hand in hand to maintain a set speed at optimal fuel consumption. rpm goes up to 3-4 is normal because engine, under pressure from gas pedal, is overworking to maintain speed at lower gear level, and fuel consumption increase as result. Once gear unlocked from 7 and jumps back to 8, i don't need to push gas pedal any harder to maintain the same speed and rpm drops back to around 1.5 as a result.
This still doesn't make much sense to me, because in my test at 60kph dropping back 2 gears still saw revs at 2200. The only way I get to 3-4k is if I accelerate there. Even doing 110kph dropping from 8 to 7 shouldn't result in 3000rpm. I'll have to do a run on the highway and check, but I'd guess closer to 2000. Even if it goes back to 6th, it shouldn't be hitting 3000, maybe 4th or 5th?

And then if you keep your foot down (even half way) then yes it will hold the gear, because it thinks you want to accelerate. It doesn't want to do that from 1500rpm, it wants you to be up over 2000rpm.

Quote:
Gear downshift and lockin happens too when using adaptive cruise control. Owners who have ACC know that when you signal right lane change, .....
Can't help you on ACC, I don't have it.
__________________
MY14 Grand Cherokee LTD CRD - ORA2 & QL | Mopar 18" Night Fever Rims & Rock Rails | Chief Recovery Hooks & Sump Skid Plate | STMaxx 275/65R18
Reply With Quote
Sponsored Links
Advertisement
 
  #12856  
Old 01-23-2015, 05:45 AM
Member
My Jeep: 2014 3.0L WK2
 
Join Date: Nov 2014
Location: Sydney, AU
Posts: 216
Thanks: 4
Thanked 69 Times in 39 Posts
Rep Power: 1237
Steve1307 has a reputation beyond reputeSteve1307 has a reputation beyond reputeSteve1307 has a reputation beyond reputeSteve1307 has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
Didnt have the problem before TCM flash as gear upshifted responsively to gas pedal whether overtake or uphill. Since flash, E.G, travel 90kph at 8th gear on motorway, gear downshift and locked to 7th at the moment when press gas pedal (far from flooring) within speed limit of 110 to overtake, rpm is up and engine struggles at 7th gear; have to ease gas pedal to bring gear back to 8th. It's worse on uphill. This is not normal.
Quote:
Originally Posted by mmcrh View Post
Normally, rpm is around1.5. When gear downshift and locked, to maintain the same speed before downshift, rpm goes up between 3-4.

So are you saying that driving along at 90kph in 8th is around 1500rpm.
When you want to overtake (gently accelerating) it kicks down to 7th and does 3000 or 4000 ??? If so, that's a serious torque converter problem.


What it should do with a gentle push is kickdown to 7th, revs step up to about 1950rpm,
Then accelerate up to 110kph still in 7th which is about 2300rpm.
Lifting off the pedal it will change to 8th revs drop back down to 1800rpm and do 110kph.

Doing 90kph in 8th, if you pushed down more it might quickly change to 6th (2300rpm) and then accelerate a bit faster to 110kph in 6th (2750rpm) overtake and then when lifting off the pedal it would go to 7th then 8th and revs come down.

If you absolutely stomped on the pedal it might change from 8th straight down to 5th (3000rpm) or even if it goes to 4th (4000rpm).
I'm sure you could do that. there's no point in diesel engine because it's working at its best at around 1800-2600 rpm.

Going uphill there is more load on the engine so it is more likely to drop to 6th or even to 5th depending on how steep or how hard you push.
There are a lot of cogs in the gearbox so yes it is likely to change down 2 gears or more if pushed harder.


Have you tried using the shift paddles so it only drops 1 gear when you tell it?




BTW ratios for the 8speed and speed at 1500rpm (obtained from ZF website) speeds are calculated estimate.
1st ---- 4.714 ---- 13 kph
2nd ---- 3.143 ---- 19 kph
3rd ---- 2.106 ---- 28 kph
4th ---- 1.687 ---- 36 kph
5th ---- 1.285 ---- 47kph
6th ---- 1.000 ---- 60kph - nice for urban roads
7th ---- 0.839 ---- 72kph
8th ---- 0.667 ---- 90kph - nice for flowing M4, 110kph is about 1800rpm
__________________
2014 Grand Cherokee Laredo CRD - Granite - towing pack only - dodgy proper reverse camera :)
ScanTool OBDLink
Reply With Quote
  #12857  
Old 01-23-2015, 07:29 AM
Member
 
Join Date: Jun 2013
Posts: 624
Thanks: 1
Thanked 23 Times in 19 Posts
Rep Power: 2178
mmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

On flat road: very gentle graduate acceleration does not result in gear downshift. Gear downshift, lockin occurs when taking quick acceleration for overtaking.

On hill: gear downshift and lockin occurs as soon as it starts climbing even on small grade despite hitting gas pedal trying to maintain or increase speed.

Before TCM flash, i hit gas pedal on uphill or for overtaking, the gear either held or increased depending on speed, but it NEVER downshift, engine literally roared in response to gas pedal with increase in rpm. For example, I travel on Mt Ousley Rd often from Wollongong to Sydney. For those who know the Rd know it's moderately steep climbing and speed limit is 80kph. Before TCM update, i could easily hit gas pedal, keep at 8th gear with speed at 80kph. But now, as soon as start climbing, gear drops to 6, and speed can not reach 80kph despite i hit gas pedal pretty hard, and rpm nearly at 4. I end up driving at 50kph+ on truck lane.

Before TCM flash, gear changed to 4th at 40kph, 5th at 50kph so on and so forth. After the flash, if very gentle increase in speed, gear changes to 4th at 30kph.........8th at 70kph, but if a tad hard increase in speed, e.g, merge to motorway, gear change to 4th at 40kph.......7th at 70kph and 8th at 95kph.
Reply With Quote
  #12858  
Old 01-23-2015, 03:55 PM
Member
 
Join Date: Jun 2013
Posts: 624
Thanks: 1
Thanked 23 Times in 19 Posts
Rep Power: 2178
mmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Steve1307 View Post
So are you saying that driving along at 90kph in 8th is around 1500rpm.
When you want to overtake (gently accelerating) it kicks down to 7th and does 3000 or 4000 ??? If so, that's a serious torque converter problem.

Yes, rpm somewhere between 1.5 - 2 at cruising speed. At INITIAL quick acceleration for overtaking, gear immediately downshift to 7th, to maintain overtaking speed of 110ish, i need to hit gas pedal FURTHER (more than half way) and rpm goes up to 3-4 as a result. If I didn't press gas further, it wouldn't reach the overtaking speed. The whole overtaking process becomes sluggish, NOT responsive. As soon as gear jumps back to 8th, i ease gas pedal, rpm drops back, speed still at 110ish.

Before TCM upgrade, the gear NEVER dropped back at initial quick acceleration, rpm simple spiked at press of gas pedal, and time taken to reach 110ish was rather fast compared to now.

It seems that once gear drops, there is sudden reduction in power and momentum. Even with further gas, it takes much longer time.
Reply With Quote
  #12859  
Old 01-23-2015, 04:00 PM
Member
 
Join Date: Jun 2013
Posts: 624
Thanks: 1
Thanked 23 Times in 19 Posts
Rep Power: 2178
mmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
Yes, rpm somewhere between 1.5 - 2 at cruising speed. At INITIAL quick acceleration for overtaking, gear immediately downshift to 7th, to maintain overtaking speed of 110ish, i need to hit gas pedal FURTHER (more than half way) and rpm goes up to 3-4 as a result. If I didn't press gas further, it wouldn't reach the overtaking speed. The whole overtaking process becomes sluggish, NOT responsive. As soon as gear jumps back to 8th, i ease gas pedal, rpm drops back, speed still at 110ish.

Before TCM upgrade, the gear NEVER dropped back at initial quick acceleration, rpm simple spiked at press of gas pedal, and time taken to reach 110ish was rather fast compared to now.

It seems that once gear drops, there is sudden reduction in power and momentum. Even with further gas, it takes much longer time.

Extra info: once gear drops, speed starts dropping too. To maintain the same speed before gear downshift, further gas is needed, let alone increase in speed for overtaking.
Reply With Quote
  #12860  
Old 01-23-2015, 05:05 PM
Member
 
Join Date: Jun 2013
Posts: 624
Thanks: 1
Thanked 23 Times in 19 Posts
Rep Power: 2178
mmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond reputemmcrh has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Steve1307 View Post

BTW ratios for the 8speed and speed at 1500rpm (obtained from ZF website) speeds are calculated estimate.
1st ---- 4.714 ---- 13 kph
2nd ---- 3.143 ---- 19 kph
3rd ---- 2.106 ---- 28 kph
4th ---- 1.687 ---- 36 kph
5th ---- 1.285 ---- 47kph
6th ---- 1.000 ---- 60kph - nice for urban roads
7th ---- 0.839 ---- 72kph
8th ---- 0.667 ---- 90kph - nice for flowing M4, 110kph is about 1800rpm

Im reading ZF site. Is ours 8HP70 (standard drive) or 8HP70H (standard/4WD)? I presume it's 8HP70H given JGC is 4WD? If that is the case, then there could be serious problem about my TCM flash which applies to 8HP70 standard drive, I quote from TSB NUMBER: 21-026-14

"MODELS: 2014 (WK) Grand Cherokee
NOTE: This bulletin applies to vehicles built on or before July 01, 2014 (MDH 0701XX) equipped with the 3.0L engine (Sales Code EXF) and the 8HP70 Automatic Transmission (Sales Codes DFD)."
Reply With Quote
  #12861  
Old 01-23-2015, 06:27 PM
Benn0's Avatar
Senior Member
 
Join Date: Oct 2013
Location: Brisbane, Australia
Posts: 2,180
Thanks: 116
Thanked 361 Times in 278 Posts
Rep Power: 18978
Benn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond repute
Garage
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
Before TCM flash, i hit gas pedal on uphill or for overtaking, the gear either held or increased depending on speed, but it NEVER downshift, engine literally roared in response to gas pedal with increase in rpm. For example, I travel on Mt Ousley Rd often from Wollongong to Sydney. For those who know the Rd know it's moderately steep climbing and speed limit is 80kph. Before TCM update, i could easily hit gas pedal, keep at 8th gear with speed at 80kph. But now, as soon as start climbing, gear drops to 6, and speed can not reach 80kph despite i hit gas pedal pretty hard, and rpm nearly at 4. I end up driving at 50kph+ on truck lane.
This still doesn't make any sense to me. You are doing 80kph in 8th, that would be about 1200rpm I would guess. If you want to accelerate at that speed the gearbox should be changing down, you don't want to accelerate at 1200rpm. Ideally it should drop back to 6th @2000rpm and allow you to accelerate. With 50% throttle it should hold 6th and accelerate up to 3500rpm at least before changing up. You should be doing around 80kph by then.

The car definitely shouldn't be doing 50kph in 6th gear at 4000rpm. As I said earlier, I was in 6th doing 60 kph at 1500rpm. So if your car is in 6th gear revving at 4000 and doing just 50kph you've got a gearbox issue and need to take it in for service.
__________________
MY14 Grand Cherokee LTD CRD - ORA2 & QL | Mopar 18" Night Fever Rims & Rock Rails | Chief Recovery Hooks & Sump Skid Plate | STMaxx 275/65R18
Reply With Quote
  #12862  
Old 01-23-2015, 06:57 PM
Member
My Jeep: 2014 3.0L WK2
 
Join Date: Aug 2014
Location: Sydney
Posts: 153
Thanks: 15
Thanked 26 Times in 25 Posts
Rep Power: 1196
Qpr39 is on a distinguished road
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
For example, I travel on Mt Ousley Rd often from Wollongong to Sydney. For those who know the Rd know it's moderately steep climbing and speed limit is 80kph. Before TCM update, i could easily hit gas pedal, keep at 8th gear with speed at 80kph. But now, as soon as start climbing, gear drops to 6, and speed can not reach 80kph despite i hit gas pedal pretty hard, and rpm nearly at 4. I end up driving at 50kph+ on truck lane.
Definitely need your gearbox checked out. I recently came up Mt Ousley at 80kph pulling a caravan with little effort. Didn't check what gear I was in. And a previous time without the van had to back off to stay on 80kph.
Reply With Quote
  #12863  
Old 01-23-2015, 08:24 PM
Benn0's Avatar
Senior Member
 
Join Date: Oct 2013
Location: Brisbane, Australia
Posts: 2,180
Thanks: 116
Thanked 361 Times in 278 Posts
Rep Power: 18978
Benn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond repute
Garage
Re: 2014 Grand Cherokee information - Australia

Just checked in 4th at 3000rpm=80kph.
__________________
MY14 Grand Cherokee LTD CRD - ORA2 & QL | Mopar 18" Night Fever Rims & Rock Rails | Chief Recovery Hooks & Sump Skid Plate | STMaxx 275/65R18
Reply With Quote
  #12864  
Old 01-24-2015, 12:10 AM
Member
My Jeep: 2014 3.0L WK2
 
Join Date: Nov 2014
Location: Sydney, AU
Posts: 216
Thanks: 4
Thanked 69 Times in 39 Posts
Rep Power: 1237
Steve1307 has a reputation beyond reputeSteve1307 has a reputation beyond reputeSteve1307 has a reputation beyond reputeSteve1307 has a reputation beyond repute
Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
Im reading ZF site. Is ours 8HP70 (standard drive) or 8HP70H (standard/4WD)? I presume it's 8HP70H given JGC is 4WD? If that is the case, then there could be serious problem about my TCM flash which applies to 8HP70 standard drive, I quote from TSB NUMBER: 21-026-14

"MODELS: 2014 (WK) Grand Cherokee
NOTE: This bulletin applies to vehicles built on or before July 01, 2014 (MDH 0701XX) equipped with the 3.0L engine (Sales Code EXF) and the 8HP70 Automatic Transmission (Sales Codes DFD)."

The box in the Jeep is the 8HP70 its also in heaps of other more expensive vehicles too like the Disco4, Beamers, Maserati, Rangie even a Rolls.
The 8HP70H i only saw it was in the BMW 7series Hybrid. - has a start/stop, boosting with hybrid motor boost.


I didn't check which version i got the numbers from 8HP70 or 8HP70H. (oops, i used the wrong set sorry - anyway only 1st,2nd, reverse only slightly different)

In the gearbox itself there is only 1 output shaft and there is a transfer case bolted to the back of it with 2 ouput shafts to get the drive to go to the front and to the back.



Anyway Jeep only uses one version of the gearbox in the Diesel, Hemi 5.7 and 6.4 SRT so its not possible that the flash was for a different version gearbox they don't use.

Now, the SRT and the Diesel will have different software for the shift patterns but I don't think it would be possible (software clash) to load the SRT program into your Diesel by mistake.


I've driven up Mt Ousley starting in 8th on the speed and it only kicked down to 7th and maintained the speed all the way up with little effort.

Dropping from 8th to 6th and the engine revving up to 4000rpm and the speed still falling to near 50k's as you described is not normal there is a lot of "slip" between the engine and the driveshafts.

I think you've got some problem with the torque converter (which is also probably electronically controlled with various sensors in it.


I recall there was a problem with some VW Amarok 8speed (think its an 8HP45?). Nothing mechanically wrong but the software running the shift and torque converter ended up destroying the torque converter if the software was not updated.
"Flashing spanner"
Flashing spanner and gear selector on display
__________________
2014 Grand Cherokee Laredo CRD - Granite - towing pack only - dodgy proper reverse camera :)
ScanTool OBDLink
Reply With Quote
Reply

Tags
2014 wk2 au, australia, SRT, wk2, wk2 au, wk2 srt

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2014 Grand Cherokee - Ordering Information and Pricing Milous Grand Cherokee - WK2 - 8297 05-13-2015 01:08 PM
TSB and Recall information: 1993-2015 Grand Cherokee & 2006-2010 Commander Milous Technical Service Bulletins and Recalls 8 12-08-2014 08:27 PM
2014 Grand Cherokee - hopefully soon! Route 66 New Members - Welcome! 7 03-24-2013 04:04 PM
2014 Jeep Grand Cherokee and 2014 MB E-class Comparison Dan JGC Grand Cherokee - WK2 - 7 01-15-2013 09:39 AM
***JeepGarage Exclusive***Latest information and updates on the "WK2" Grand Cherokee Milous Grand Cherokee - WK2 - 4 07-20-2010 06:17 PM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:07 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.