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Unread 02-04-2010, 08:12 PM   #1
Xtremjeepn
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Why the 3.8L V6 sucks.....the video!!

Went skiing today and took my helmet cam along with me. So on the way back I took a video of what it takes from the 3.8L to climb from Silverthorn, CO up to the tunnel on the way home.

It was worse with the 4:10s, now it has 5:13, auto, 35s.



Kinda long (8 min) because I left it totally unedited.

http://www.youtube.com/watch?v=UVIVErL9RYk

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Last edited by Xtremjeepn; 02-05-2010 at 08:40 AM..
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Unread 02-04-2010, 09:35 PM   #2
Spank
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We Coloradan's have it the worst because our state just doesn't have any air.
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Unread 02-04-2010, 09:50 PM   #3
Unlimited04
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its not a problem with the engine. its the horrible 42RLE transmission. its a pile of dog shet, my 4.0L can't climb the tunnel without 4500rpms in 2nd gear to maintain 50mph - on 30s or 31s and 3.73s. my 4.0L HATES it.

and people wonder why i dont have 33s....



this was climbing east to west.

my friend with a TJ, stock 4.0L, NV3550, 31s & 3.73s gets to breck literally 30 minutes before me...he can maintain 70-75mph...
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Unread 02-04-2010, 09:52 PM   #4
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If I remember correctly you lose roughly 3% of horsepower per 1,000 feet of altitude. Add that to an already underpowered vehicle. The supercharger would help out tremendously. I miss my turbocharged vehicles

I see you have an auto too.
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Unread 02-04-2010, 10:07 PM   #5
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Not to question the video or the criticism of the engine, but with the exception of some high performance vehicles and maybe big diesel pickups, what vehicles would not suffer a severe performance drop in high altitude?
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Unread 02-04-2010, 10:14 PM   #6
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Quote:
Originally Posted by Unlimited04 View Post
its not a problem with the engine. its the horrible 42RLE transmission. its a pile of dog shet, my 4.0L can't climb the tunnel without 4500rpms in 2nd gear to maintain 50mph - on 30s or 31s and 3.73s. my 4.0L HATES it.

and people wonder why i dont have 33s....



this was climbing east to west.

my friend with a TJ, stock 4.0L, NV3550, 31s & 3.73s gets to breck literally 30 minutes before me...he can maintain 70-75mph...
Yup, when my OD is off (has to be in order for me to climb a freakin hill) I'm running high *** rpms and it sucks....almost makes me think it's bad for the engine.
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Unread 02-04-2010, 10:16 PM   #7
Xtremjeepn
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For reference. We did the same drive in my business partners WK 5.7l on Tuesday. It pulls the same hill at 75mph at about 2,700 rpm effortlessly.
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Unread 02-04-2010, 10:34 PM   #8
darg
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It's not the engine, it's the gear box. It really sucks and the logic/electronic is a pretty bad setup. The high RPMs on hills is one thing but the controller is not letting you to speed up just a little bit by pressing a little on the throttle without dropping down in gears (kick down) and that is what is causing low milage due to the ever needed shifting of the gear box which is not really needed. The 3.8 Liter has a nice torque and don't need a lot RPMs to pull forward.
I read a lot about tuning the engine with these electronic boxes, is there a tool to change the programming of gear box? I'm looking for some possibility to make it less nervous to give me the chance of giving mkore throttle without shifting down. I hate the drive-by-wire crap. All my automatics were capable to speed up on highway just a little without downshifting why not Jeep?!?!
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Unread 02-04-2010, 10:40 PM   #9
Unlimited04
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just look at the gearing:

42RLE:
30s w/ 3.73s turns 2000 rpm in OD at 70mph
35s w/ 4.88s turns 2250 rpm in OD at 70mph
35s w/ 5.13s turns 2375 rpm in OD at 70mph
35s w/ 6.17s turns 2850 rpm in OD at 70mph

NSG370:
30s w/ 3.73s turns 2450 rpm in OD at 70mph
35s w/ 4.88s turns 2750 rpm in OD at 70mph
35s w/ 5.13s turns 2900 rpm in OD at 70mph
35s w/ 6.17s turns 3500 rpm in OD at 70mph

you need 6.17s with the 42rle to equal 4.88s with the nsg370, w/ 35s.
http://www.jeepforum.com/forum/f9/35...nhappy-962604/
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Unread 02-04-2010, 11:29 PM   #10
Dmcastino
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That Silverthorn pass is a bear
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Unread 02-04-2010, 11:53 PM   #11
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As previously mentioned by the other TJ owners, it's the 42rle transmission's .69 OD gear, not necessarily the engine. If you had the NSG370 and the same gear/tire combination, the picture would be totally different and your jeep would not be struggling. With the 42rle, you're only at 2200 RPM at 65mph, when in your situation you need more like 2700ish RPM. With the 6 speed and all else equal, you would be at 2688 RPM at 65mph, just about perfect. Sure, the 5.7 helps a lot over your 3.8 but the real issue is the gearing. In order to run that hill without it downshifting, you would need 6.17 gears.
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Unread 02-05-2010, 04:39 AM   #12
Xtremjeepn
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The real issue at 9,000 to 11,000 feet is POWER. If the Jeep had the power to pull, it would not want to shift clear down to 2nd gear to run 60 mph at 5,500 rpm ALL the way.


(youtube destroyed the quality of the video and made it impossible for some to read the tach, working on a version that might still work on youtube)
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Unread 02-05-2010, 06:57 AM   #13
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Cole seems to be talking himself into another modification; I smell a hemi or supercharger for him soon.

Oooooooo baby....
Quote:
Originally Posted by Burnsville Offroad
Burnsville Offroad can now install the 5.7 VVT motor. The new variable valve timing motor from Chrysler boasts 390 horsepower and will get better than 20 mpg on a fullsize truck. Burnsville Offroad is always on top of the newest Hemi wrangler developments and is the only place to offer this motor as a JK conversion. Pricing for this motor is exactly the same as the standard 5.7 conversion. As always Burnsville Offroad can add a 6 speed transmission to any of its Hemi conversions. Give Dan a call today to get on the schedule for your new 5.7 VVT conversion.
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Unread 02-05-2010, 08:02 AM   #14
Intrepid4576
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Originally Posted by ncb View Post
If I remember correctly you lose roughly 3% of horsepower per 1,000 feet of altitude. Add that to an already underpowered vehicle. The supercharger would help out tremendously. I miss my turbocharged vehicles

I see you have an auto too.
202hp is not underpowered it is from what i heard the most powerful engine a jeep wrangler has had as of yet? i have no problems with very steep hills at all....this is part of why i bought a manual i live in the mountains and knew of such things before i even drove a new jeep automatics suck specifically on hills...whats the big surprise
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Unread 02-05-2010, 08:14 AM   #15
Xtremjeepn
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Quote:
Originally Posted by Hilldweller View Post
Cole seems to be talking himself into another modification; I smell a hemi or supercharger for him soon.

Oooooooo baby....

The Bursville quote is wrong. I saw AEV offering the VVT Hemi awhile back. They both had top wait for Chrysler to offer up the software out the parts dept.
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