Hi all - I always wondered why our engine’s run so hot at 105c and upwards, what do you think about the thermostat mod that lowers it the water temp to 88c? Ecs do it for 113 dollars plus shipping to old Blighty, so it ain’t cheap, but would do it if recommended by this learned forum?
It should be easy for you to get on your side of the pond, It's from a diesel I think 730d? get the behr one, I'm super happy with mine!
E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me
I did this mod on my 540/6. Also ran Evans NPG and my coolant system was unpressurized. Max temp I ever got was 98c in the middle of summer with the AC running. My indie mechanic even stressed tested the system and said it would hold the temps I mentioned. He was curious because he had never seen the mod before.
Ran this system for 2 years until I sold the car a couple of months back.
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Where are folks getting the Behr unit?
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Thanks all - justbought it from Amazon VEMO Thermostat, coolant V20-99-1268
Not cheap! But as I’m draining the coolant soon, I’ll do it then.
It's always a good idea to get rid of the original TM thermostat!
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
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I have been running this 88c tstat with custom programmed DME so it does not throw a 140 MAP tstat error...
Vemo 88c for the last 30k, absolutely no issues. 93c - 96c highway and hot traffic w/ac on.
No reason not to switch it out, save the beast from baking in her own juices.
Although the coolant temps are lower i think the radiator produces more heat under the hood with the 88c tstat...
Underhood temps should drop some. Lower temp and pressure will be a bit nicer to the plastic cooling system parts, but with the tradeoff of burning a little more fuel and more risk of condensation, etc. building up in the oil in cold weather (if you don't take enough longer drives).
Anyone running an 88 thermostat and an E65 clutch fan? Feedback?
Am highly tempted to run the Evans waterless coolant, particularly as our cars run quite hot, but if I did I presume the 88 degree thermostat would be redundant?
For those of you running the 88 degree t-stat....does it throw a check engine light?
CURRENT:
2001 740IL ALPINE WHITE
1999 BMW DINAN 5 BIARRITZ BLUE
PAST:
2001 740I M-SPORT SCHWARTZ
2001 BMW 330XI SPORT BLACK SAPPHIRE
2002 BMW 325XIT TITANIUM SILVER
2002 BMW 530I TITANIUM GREY
2002 BMW X5 TOPAZ BLUE
2003 BMW 325XI ELECTRIC RED
1998 740IL ASPEN SILVER
1998 740IL ORIENT BLUE
1995 BMW 530I OXFORD GREEN
1988 528E BLUE
1980 320I WHITE
1978 320I GREY
Mine does not! It will store an error in the DME but no check engine on the M62TU. It may if you run it on a non TU M62. I have had my DME programmed to remove the DME error for the map sensor so I dont even get a stored DME error for the missing MAP cooling sensor...
Nice! Thanks! I've got two Behr 88s and will be installing them into both my 01s
CURRENT:
2001 740IL ALPINE WHITE
1999 BMW DINAN 5 BIARRITZ BLUE
PAST:
2001 740I M-SPORT SCHWARTZ
2001 BMW 330XI SPORT BLACK SAPPHIRE
2002 BMW 325XIT TITANIUM SILVER
2002 BMW 530I TITANIUM GREY
2002 BMW X5 TOPAZ BLUE
2003 BMW 325XI ELECTRIC RED
1998 740IL ASPEN SILVER
1998 740IL ORIENT BLUE
1995 BMW 530I OXFORD GREEN
1988 528E BLUE
1980 320I WHITE
1978 320I GREY
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