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flman
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Joined: 28/08/2009 19:59:32
Messages: 74
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Dave wrote:Thanks for the link. I would like to post on that forum, but I'm outside, looking in. I forgot my user name and password and can't create a new one because my email address is "already in use". And, I can't get any response from the moderator...oh well.

Ultimately, I think the OEM tstat mod would be the best way to go. My $30 mod seems to be working, and I'm sure I'm getting a significant mpg increase. I don't know how much yet due to little travel and too many variables. I will be taking a trip to my cottage (300 mile round trip) next week, which will be good for data.

Thanks again.


Do you remember any specific wording you have used in a post? Maybe you could search the phrase? Or you can just go to Google or Yahoo and get a second email address?

Still Burnin Oil since 1992!
2010 John Deere 2305 3 cylinder Yanmar
GDE HOT!! Tuned 2006 CRD LTD Silver, Euro TC, GDE Tuned TCM, B&M Trans drain kit
GDE ECO Tuned 2006 CRD Sport Black, B&M Trans drain kit, Front and rear hooks, Full Skids
GDE ECO Tuned 2005 MB 2500 Sprinter Van
2010 MB 2500 Sprinter Van
WXman
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Joined: 29/01/2010 14:53:49
Messages: 28
Location: Kentucky
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Any update on how the Jeep is running without the mechanical fan?? I'd love to take mine off permanently and save the fuel. Not to mention allow the Jeep to run just a tad warmer. But if 80s and 90s would cook the engine this Summer...then it wouldn't be worth it of course.

'05 Liberty CRD Limited
Factory Off-Road Package
Daystar spacer lift/Conduit washers
Skyjacker H7088s in the rear
Renegade wheels
255/70-16 General Grabber AT2s
GDE HOT Tune
EHM
No clutch fan
"Euro" TC
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
So far the KJ is still running right at the start of thermostat opening on teh vehicle we removed the mechanical fan on. The temps have been in the 50s to low 60s and the fule economy is up about 1.5 mpg. We plan on keeping it off throughout the summer until we notice any cooling issues. And of course, no towing with this vehicle.
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WXman
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Joined: 29/01/2010 14:53:49
Messages: 28
Location: Kentucky
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OK well I got my fan off tonight. Ended up recruiting my 35-year veteran mechanic father to help me out. Took us a solid hour at least to get the fan off. Looking forward to seeing what kind of gain it might provide.

My only concern is going to be when the weather really warms up next month and especially this Summer. And also, will this cause the electric fan to run a lot...thereby wearing out the electric fan faster. Time will answer those questions I guess...


Edit: So far the max ambient temp. has been around 70 degrees. However, my temp. guage does not go above the "half" mark...even when sitting at a stoplight. I think most Summer weather (80-90 around here) should be OK without the clutch fan. The 90+ degree days are going to be the real test.

'05 Liberty CRD Limited
Factory Off-Road Package
Daystar spacer lift/Conduit washers
Skyjacker H7088s in the rear
Renegade wheels
255/70-16 General Grabber AT2s
GDE HOT Tune
EHM
No clutch fan
"Euro" TC
TDIwyse

Joined: 01/10/2009 06:58:20
Messages: 54
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WXman wrote:Any update on how the Jeep is running without the mechanical fan?? I'd love to take mine off permanently and save the fuel. Not to mention allow the Jeep to run just a tad warmer. But if 80s and 90s would cook the engine this Summer...then it wouldn't be worth it of course.


I still have my mech fan removed. It was in the mid 80's here yesterday. I did a fair bit of town driving today (stop n go with the AC on) and lots of interstate driving and the temp gauge was higher than I recalled seeing it before in similiar conditions (but it's been a long time since it's been this warm here) but it never got to the straight up point. It stayed about midway between the 176 (mark to the left of straight up) and 216 (straight up mark) on GDE's Temp gauge description photo.

2006 Liberty Limited CRD
2004 Ram Quad Cab 4x4 Cummins
2001 VW Jetta TDI
1990 YJ with 2006 Cummins B3.3T
Dave

Joined: 26/01/2010 13:56:59
Messages: 27
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I have been following the thermostat project on the L.O.S.T. forum. I wish I could reply there. It made me think that I owe this forum an update to my homemade inline 195* tstat. I have been running it for a few months now without any problems. At the same time, I removed the mech. fan and shroud, so I don't know how much of my gain to assign to either mod. My mileage is up between 2 and 3 mpg. Under ideal conditions and cruising around 60 mph, the gain is more than 3 mpg. Also, and this has to just be my imagination, but I swear the torque converter locks earlier (56-57 mph) and the trans holds gears better at low rpm and light pedal. It must be due to something else because I can't see where engine temp would have any affect on the trans. I do know that when up to temp the engine is quieter. We had some days here in Michigan where the temperature was in the high 80's. I got real nervous on one of those days while caught in stop and go traffic. The gauge never made to the straight up mark. So far so good.

Dave
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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
Dave,

Thanks for the update. Can you post pictures of the installation either here or on LOST? Is the set-up still running with one hole drilled through the in-line t-stat? The FE improvement is definitely worth while. You would need to perform some A to B testing with the mechanical fan re-installed to better understand the % split between the higher operating temps vs. having the fan removed.

As for the transmission operation...it must be a vivid imagination as the shift points are coded in the logic and will not change on their own. The engine should be slightly quieter with the increased liner temps.

This is good stuff and many people are interested in this option.
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yrkcrd

Joined: 08/10/2011 22:26:06
Messages: 4
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Any long term updates on running no mech fan?
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 353
Location: Southeast Michigan
We have only been running without the mechanical fan during the winter months. It helps to counteract the fuel economy drop from winterized fuel. No issues to report when running without the fan, just do not tow much in this configuration.
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DynoPax
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Joined: 28/03/2010 13:41:56
Messages: 5
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Reading this has given me the push to try this out this winter... I'll remove the fan as well and see if this makes a difference. Winter fuel is already being distributed up here (Ottawa-Gatineau region) and my MPG is not faring as well already...
 
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