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E36/7 Z3 (1996-2002)
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  #1  
Old 04-13-2012, 11:28 AM
ZIXXER ZIXXER is offline
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What temp does your Z3 run at?

Just had a new water pump and thermostat fitted and noticed the car is running at a higher temerature than before.

Before she would usually run at about one quarter on the temp guage, but now she sits just a shade above halfway on the guage.

Little concerned about this due to the concerns we all have about water pumps and just wanted to put it to the experts to see what you think.
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  #2  
Old 04-13-2012, 12:01 PM
deni2s deni2s is offline
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Mine 2.8 Z3 usually is right in the middle.
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  #3  
Old 04-13-2012, 12:10 PM
comsult comsult is offline
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Mine is right in the middle.
Your previous thermostat could have been stuck in the open position, that would have let your engine run cooler.
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  #4  
Old 04-13-2012, 01:30 PM
dougmcintyre dougmcintyre is offline
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Right in the middle, except when the old thermostat stuck in the open postion.
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  #5  
Old 04-13-2012, 02:11 PM
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BeemerMikeTX BeemerMikeTX is offline
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My understanding is the Z3 temperature gauge is damped by the ECU. It ALWAYS points to the middle, unless the water temperature is very cold or very hot.
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  #6  
Old 04-13-2012, 02:37 PM
FredR FredR is offline
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Mine when at operating temp is a needle width to the right of center.
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  #7  
Old 04-13-2012, 03:54 PM
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BeemerMikeTX BeemerMikeTX is offline
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Quote:
Originally Posted by FredR View Post
Mine when at operating temp is a needle width to the right of center.
Once up to operating temperature, does it ever vary from that position?
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  #8  
Old 04-13-2012, 04:25 PM
FredR FredR is offline
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Rock steady just off the middle, doesn't vary.
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  #9  
Old 04-13-2012, 04:28 PM
DaveBZ3 DaveBZ3 is offline
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Right in the middle.
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  #10  
Old 04-13-2012, 04:56 PM
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BeemerMikeTX BeemerMikeTX is offline
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Quote:
Originally Posted by FredR View Post
Rock steady just off the middle, doesn't vary.
Don't you find that unusual, if the gauge is reading the actual water temperature, that your water temperature never varies? The gauge readout is damped (or controlled) by the ECU.

I think if you look at the gauge straight on, instead of from your position in the driver's seat, you will see that the needle essentially points straight up (at least that's how mine is).
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"Beemer" is for my BMW motorcycles - '13 K1300S, '95 R1100RS, '88 K75S, '75 R90S (gone, but not forgotten).

Last edited by BeemerMikeTX; 04-13-2012 at 05:05 PM.
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  #11  
Old 04-13-2012, 05:31 PM
FredR FredR is offline
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I would, except when the original radiator failed the gauge did move from straight up. It would cycle between normal and hot back to normal. So I know the temp sending unit and gauge work to notify me of impending doom.
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  #12  
Old 04-13-2012, 06:52 PM
ZZZING ZZZING is offline
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Actual temperature

Mine runs between 190 and 207 as displayed on my ScanGauge II readout plugged into the OBD port. The gauge is right in the middle no matter what the readout -- once it warms up that is. When my thermostat was stuck open the readout was around 160, gauge was well to the cold side until I replaced the thermostat (and water pump, belts and one tensioner, and hoses at 80K)
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Old 04-13-2012, 07:36 PM
smayo964 smayo964 is offline
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My gauge runs straight up in the middle. With the analyzer plugged in going down the road, I'm hovering about the 180 deg mark.
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  #14  
Old 04-13-2012, 08:33 PM
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BeemerMikeTX BeemerMikeTX is offline
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Quote:
Originally Posted by FredR View Post
I would, except when the original radiator failed the gauge did move from straight up. It would cycle between normal and hot back to normal. So I know the temp sending unit and gauge work to notify me of impending doom.
That sounds about how the gauge damping works.
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2001 Z3 3.0i Roadster (Topaz Blue Metallic, 5-speed manual, Sport Package, CD radio, heated seats and mirrors, non-power top via special order)
"Beemer" is for my BMW motorcycles - '13 K1300S, '95 R1100RS, '88 K75S, '75 R90S (gone, but not forgotten).
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  #15  
Old 04-14-2012, 03:24 AM
ZIXXER ZIXXER is offline
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Thanks for the info lads. My old thermostat must have been stuck open. The needle actually sits rightdead in the middle, it just appears a tiny bit to the right from the perspective in the seat.

Does having a thermostat left stuck open cause any damage or a lack of performance, seen as the engine wouldn't have been able to reach correct temp?
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  #16  
Old 04-14-2012, 04:21 AM
deni2s deni2s is offline
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Quote:
Originally Posted by ZIXXER View Post
In cause any damage or a lack of performance, seen as the engine wouldn't have been able to reach correct temp?
I don't think there should be some lack of performance, because cold engine always performs better. Could be more wear of engine as usual, as it's never reached it's optimal temp, but if you are changing oil and checking coolant level regularly I don't think that should be a problem.

The problem raises when engine temp is above normal - it could overheat and make damage to engine head and to some details inside engine which is very expensive to repair.

Some years ago I had problem with coolant leaking when engine was hot, but hopefully I spotted that my engine is overheating before it was too late, and my engine still works as a clock
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  #17  
Old 04-14-2012, 04:59 AM
ZIXXER ZIXXER is offline
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Thanks very much for that info chief, puts the mind at ease
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Old 04-14-2012, 09:22 PM
tohbi tohbi is offline
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Quote:
Originally Posted by smayo964 View Post
My gauge runs straight up in the middle. With the analyzer plugged in going down the road, I'm hovering about the 180 deg mark.
isn't that a bit too cold? i'm thinking the engine should operate around 200.
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  #19  
Old 04-15-2012, 05:47 AM
smayo964 smayo964 is offline
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Tohbi. I have a couple my small block chevy's running at 180, but they are also running 87 octane and I don't want them knocking. I will put the ole analyzer on the car today while taking my drive and see where the ole girl is running at and let you know. The car runs great as is, so I don't know if I'll change it if the temp is at the 180 mark. I've read before there are some advantages for running a tad cooler, especially here in MS where it gets so darn hot and humid in the summer. I'll let you know.
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  #20  
Old 04-15-2012, 04:27 PM
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IgotBMW IgotBMW is offline
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Straight up the middle.

Before I changed it, it was between the left and middle so I knew my Tstat was stuck open. Soon as I changed it, now it's ends up straight up.
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  #21  
Old 04-16-2012, 12:47 PM
DeathFromAbv DeathFromAbv is offline
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Quote:
Originally Posted by DaveBZ3 View Post
Right in the middle.
Same here...98 5spd 1.9
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  #22  
Old 04-16-2012, 06:21 PM
ZZZING ZZZING is offline
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No lack of performance but worse gas mileage

Quote:
Originally Posted by ZIXXER View Post
Thanks for the info lads. My old thermostat must have been stuck open. The needle actually sits rightdead in the middle, it just appears a tiny bit to the right from the perspective in the seat.

Does having a thermostat left stuck open cause any damage or a lack of performance, seen as the engine wouldn't have been able to reach correct temp?
Also lack of heat from the heater if you need it
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  #23  
Old 04-16-2012, 09:37 PM
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Mine stays in the middle unless it is hot and I am getting on it hard, it may go up a bit then, oil temp gauge rises more when I keep the RPM's up over 4 K for periods of time. What temp thermostat did you put in or have installed?
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  #24  
Old 04-17-2012, 02:11 PM
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ghpup ghpup is offline
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temp gauge is in the middle and can go a bit beyond on really hot days if I'm driving more than 40 mintues, but not much.

I actually pay more attention to my oil temp since my ///M has a gage. It also wanders just beyond 200* on those same hot drives, but not much. Normal conditions it hovers around what looks like 170-200. During the winter, I extend my drive into work until the oil gets beyond 150*
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  #25  
Old 04-17-2012, 03:36 PM
smayo964 smayo964 is offline
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Hey all! Finally got a chance to get some readings on the ole Z3. It was raining today, but I was able to hook up the analyzer and get a reading while buzzing down the hwy at 60mph. Like I said previously, mine is hovering around the 180 mark. See images
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