E40D T.C. Lockup - Ford Powerstroke Diesel Forum

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 15 Old 01-24-2012, 09:51 AM Thread Starter
Compression Ignition Addict
 
backwoodsboy's Avatar
 
Join Date: Nov 2011
Location: The great state of Warshington
Posts: 889
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
E40D T.C. Lockup

How many of you guys are running a torque converter lockup switch? Any noticable decrease in transmission temperatures?
My truck isn't a tow-pig, but I've noticed trans temps getting up in the 200-220 range while climbing up to my favorite hunting spot. Nothing crazy, just a steep, swtich-back, forestry access road. Basically low speeds, moderate RPM, and 4x4 engaged. My understanding of factory PCM is that the T.C. is unlocked at speeds less than 25mph. So basically all I'm doing on these hour long climbs is compressing my fluid and heating it up. Someone correct me if I'm wrong.
Ran a search, but most of the applications I found were guys towing heavy.
backwoodsboy is offline  
post #2 of 15 Old 01-24-2012, 10:29 AM
Compression Ignition Addict
 
elrojo63's Avatar
 
Join Date: Oct 2007
Location: Lewisburg, Pa
Posts: 1,189
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
well i think part of your problem is the low speeds. You dont have an added tranny cooler right? An electric fan one might be a good idea to keep temps down. I always thought a lockup switch was more for deceleration purposes

1997 PSD Crew Cab Shorty Centurion Flatbed 234k D60 Swap
Leather Interior, built in radar detector, 5 inch dozer stack, DIY exhaust brake/TC lockup

1997 F-250 PSD ZF5 4x4 RCLB 362k SOLD

1953 Clark Carloader Forklift
1996 Subaru Legacy Wagon
2001 Big-Tex 16' Landscape Trailer
2006 Suzuki King Quad 750 27 inch ITP Mudlites
elrojo63 is offline  
post #3 of 15 Old 01-24-2012, 10:38 AM
Compression Ignition Addict
 
jlarsen's Avatar
 
Join Date: Aug 2007
Location: Kuna, Idaho
Posts: 316
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
i tend to just throw it in 4 low if the temp starts climbing. It drops it right down. I do it a lot when I tow up windy dirt roads where speed doesn't matter, but that's a 4R100 and a bigger trans cooler.

2002 F350 Crew cab Lariat
Power Hungry Performance Gryphon- Custom Tunes
GTP38R
Bellowed Up pipes
NON-EBP Pedistal
4 Inch Lift and 35 inch Goodyear DuraTracs
AFE Stage 2 Pro Guard 7
MBRP 4 inch turbo back
GDS High flow power outlet
Zoodad mod
Tranny cooler
Trans go shift kit
Airlift Bags with compressor

1996 extended cab 4x4 Powerstroke TOTALED
5 speed, heavy duty clutch
AFE stage 2 intake pro guard 7 filter
4 inch Diamond Eye turbo back exhaust
cat delete
TW chip
jlarsen is offline  
post #4 of 15 Old 01-24-2012, 12:01 PM Thread Starter
Compression Ignition Addict
 
backwoodsboy's Avatar
 
Join Date: Nov 2011
Location: The great state of Warshington
Posts: 889
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Yeup, I've got an oversized tranny cooler. P.O. installed it when he cooked the second stock E40D and installed a built one. I've given an aux electric one some thought, but if I could fix my issues simply by locking the T.C. that would save me some money.
Jlarsen, how does 4-Lo decrease transmission temps? If anything, it seems that engaging low range would do the opposite. More RPM for the same number of wheel rotations --> more heat. Or maybe I'm missing something.
backwoodsboy is offline  
post #5 of 15 Old 01-24-2012, 12:15 PM
Compression Ignition Addict
 
jlarsen's Avatar
 
Join Date: Aug 2007
Location: Kuna, Idaho
Posts: 316
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
what I'm thinking is higher rpm circulates fluid faster and faster fan speed. It helps. I tow my boat on some ugly dirt roads with steep grades. I know of a lot of transmissions that don't make it up and down. I've tried it in 4 wheel high and didn't make it far before i hit 230. Threw it in 4 low and it dropped to 190 fairly quick and stayed under 200 the rest of the way. Roughly a 10 percent average grade for 7 miles and a 6 percent grade for 10 miles.

2002 F350 Crew cab Lariat
Power Hungry Performance Gryphon- Custom Tunes
GTP38R
Bellowed Up pipes
NON-EBP Pedistal
4 Inch Lift and 35 inch Goodyear DuraTracs
AFE Stage 2 Pro Guard 7
MBRP 4 inch turbo back
GDS High flow power outlet
Zoodad mod
Tranny cooler
Trans go shift kit
Airlift Bags with compressor

1996 extended cab 4x4 Powerstroke TOTALED
5 speed, heavy duty clutch
AFE stage 2 intake pro guard 7 filter
4 inch Diamond Eye turbo back exhaust
cat delete
TW chip

Last edited by jlarsen; 01-24-2012 at 12:29 PM.
jlarsen is offline  
post #6 of 15 Old 01-24-2012, 05:54 PM Thread Starter
Compression Ignition Addict
 
backwoodsboy's Avatar
 
Join Date: Nov 2011
Location: The great state of Warshington
Posts: 889
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Didn't doubt you for a second my friend. I'm just the kind of guy who likes to know 'why' something happens, not just that it does. Seemed a little counter-intuitive to me.
backwoodsboy is offline  
post #7 of 15 Old 01-24-2012, 06:12 PM
Compression Ignition Addict
 
jesilvas's Avatar
 
Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,148
Thanks: 0
Thanked 27 Times in 25 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
Faster RPMs with an unlocked TC will just heat up faster.
When you do a TC lock, you don't have all that added slippage, therefore eliminating that heat factory. Only thing is, you have to drive it like a manual. Keep RPMs up in your power band. For me with it locked, any RPMs below 1000 and it starts rattling and sounding bad. Just play with it. It's really quick to learn.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
jesilvas is offline  
post #8 of 15 Old 01-24-2012, 07:04 PM Thread Starter
Compression Ignition Addict
 
backwoodsboy's Avatar
 
Join Date: Nov 2011
Location: The great state of Warshington
Posts: 889
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
So i was correct with my initial thought, that engaging low range would increase transmission temperatures?
I'm no transmission expert, but it seems to make sense given the TC is a hydrodynamic fluid coupling. More rotations of the flywheel --> more fluid compression --> increased heat.
Given a TC takes the place of a mechanical clutch, keeping rpm's in the powerband makes sense. No complete stops with TC locked, yada yada. I don't plan on using this extensively around town. Mainly on long distance, steep, 4x4 climbing. It would also be nice to use it as an engine brake on the way back down.
Out of curiosity, what kind of switch did you use? single-pole single-throw? A link would be great.
Also heard that locking the TC in first gear can cause some issues, as not enough fluid is circulated to properly cool the tranny?
backwoodsboy is offline  
post #9 of 15 Old 01-24-2012, 07:19 PM
Compression Ignition Addict
 
jlarsen's Avatar
 
Join Date: Aug 2007
Location: Kuna, Idaho
Posts: 316
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I don't know. It sure seems to work. I just leave it in 4 low manually shift 1st and 2nd most of the time. Maybe it could be that with the higher rpms the fans drawing the air thru the cooler faster. But this is towing. I've never thought about a lock up switch but it might be something to look into

2002 F350 Crew cab Lariat
Power Hungry Performance Gryphon- Custom Tunes
GTP38R
Bellowed Up pipes
NON-EBP Pedistal
4 Inch Lift and 35 inch Goodyear DuraTracs
AFE Stage 2 Pro Guard 7
MBRP 4 inch turbo back
GDS High flow power outlet
Zoodad mod
Tranny cooler
Trans go shift kit
Airlift Bags with compressor

1996 extended cab 4x4 Powerstroke TOTALED
5 speed, heavy duty clutch
AFE stage 2 intake pro guard 7 filter
4 inch Diamond Eye turbo back exhaust
cat delete
TW chip
jlarsen is offline  
post #10 of 15 Old 01-24-2012, 07:55 PM
Compression Ignition Addict
 
jesilvas's Avatar
 
Join Date: Feb 2009
Location: Nacogdoches, TX
Posts: 11,148
Thanks: 0
Thanked 27 Times in 25 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
There is a write up for a TC lock up mod here.
It's not more fluid compression that makes heat but the clutches slipping against eachother creating more heat and friction.
You don't wanna use the TC lockup when you're slow. You won't have enough RPMs for it to be effective. Just play with it and you'll see what you can and can't do though. I love mine.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
jesilvas is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome