coolant temp drops at WOT
my coolant gauge reach operating temp and stay there in any outside teperature condition and any driving condition ( idle , traffic , low speed , high speed , highway cruising , spirited drive mid-high rpm ) but when i push very hard at WOT to redline with outside cold weather , temperature gauge drops suddenly and then return in normal operating temp in about 30 sec when rpm slow down.
Here's a video take a look to the temperature gauge , what could happen ? i don think this is normal , what do you think ? https://www.youtube.com/watch?v=X7Ro69Rx9mE&feature=youtu.be |
I think you're OK but maybe I'm wrong. How cold outside are we talking? Also, where are you going 310KPH at? :eek:
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Oh, I see 4.5C or 40F. I think you're OK. Careful man, most of these performance tires aren't made to run that cold.
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Temps dropping while moving and returning idling could be thermostat failing.
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Originally Posted by cosworth
(Post 4711632)
my coolant gauge reach operating temp and stay there in any outside teperature condition and any driving condition ( idle , traffic , low speed , high speed , highway cruising , spirited drive mid-high rpm ) but when i push very hard at WOT to redline with outside cold weather , temperature gauge drops suddenly and then return in normal operating temp in about 30 sec when rpm slow down.
Here's a video take a look to the temperature gauge , what could happen ? i don think this is normal , what do you think ? https://www.youtube.com/watch?v=X7Ro...ature=youtu.be OP I have the same issue. I have swapped out for a new fuel pressure sender but it's still the same. Btw noticed ur car revs to 7200rpm? Did u tune it to increase redline? |
It is probably the stat then. Does your car take a long time to warm up?
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Thanks at all for your replys , the dealer also thought it could be a failing thermostat , the only thing it sounds strange to me is that the temperature drop ONLY in this hard WOT pulls to redline with cold ambient temperature ( 40 F ) .
In all other driving condition the needle remain in perfect operating temperature so , is not like s65e90 said that temperature dropping while moving and remaine at idle , my temperature warm up in short time and remain costant while moving , also at high speed if the rpm remaine below 6000 rpm , so for example if i cruise in winter at a speed of 250 km/h in 6th gear partial throotle at 5000 rpm , coolant temperature remain constant , no matter how cold is outside. So it seems the thermostat do its job fine in all conditions but at WOT it seems the high speed of water pump / high pressure in coolant overcome the t-stat ability to handle the temperature or it not responds faster enough to keep the temperature stable under high loads . After temperature dropping in this Wot condition , it return in normal position in about 30 seconds while the car still moving at high speed but rpm slow down from 7000 to 5000 - 6000 , so it seems rpms / water pump speed create the " issue " . Next week i'll try to replace t-stat like dealer saids and we will see if it fix. Yes my car is tuned by rs-tuning , ecu and hybrids 16 / 24 s and rev limiter is raise to 7400 . Those high speed runs were from German Autobahn Here's another : Accordly to speedo and rpms , indicated speed should be 350 / 352 km/ h , gps 330 - 332 :) My tires are Michelin Ps2 . |
it'll happen on WOT pulls until the rads are up to temp, normal
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Originally Posted by 993GT
(Post 4711684)
it'll happen on WOT pulls until the rads are up to temp, normal
No risk for thermal shock haeds / block / head gasket when suddenly cold coolant enter in engine in those wot pulls ? So if you were me to replace thermostat is worth ? |
My car is doing same thing, car was checked and everything is ok.
Happens only during WOT on highway... I think that it is normal. |
Originally Posted by JH996tt
(Post 4711692)
My car is doing same thing, car was checked and everything is ok.
Happens only during WOT on highway... I think that it is normal. Yes this is my first car with rear engine / front radiators , maybe when car is warmed up in normal driving , and thermostat stay closed most of the time to keep operating themperature 80 - 85 C , coolant from the engine block is at 80 - 90 C and coolant in front radiators is maybe at 35 -40 C , so when suddenly push this cars at WOT , the coolant in engine also raise suddenly from 80 to 100 so the t-stat suddenly open and the high engine / water pump rpms push a lot of pressure moving the cold coolant from radiators to the engine dropping the temperature of coolant in the engine from 80 - 85 to 60- 65 C ??? The only thing i'm a little concern about is that this suddenly temperature change can put a thermal stress on the engine and head gasket ? I dont know .... |
I would go ahead and change change the stat. It is a 30 dollar part plus the o ring and maybe 30 minutes of work.
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Originally Posted by brnrdtns
(Post 4711702)
I would go ahead and change change the stat. It is a 30 dollar part plus the o ring and maybe 30 minutes of work.
Is necessary flushing all the coolant to replace t-stat ? |
No. You will lose some though.
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from my experience they all do it... 30L of coolant needing warmed up....it's not ideal but it happens, try to get the whole system up to temp before doing a big pull, even a small/light pull when the engine is up to temp to help warm the front end of cooling system warm a bit to reduce the variation
Never hurts to do P.M. on the car, worth a shot to see if it helps the situation a bit and have peace of mind
Originally Posted by cosworth
(Post 4711686)
Thanks 993 GT , nice info so in your opinion nothing to concern about ?
No risk for thermal shock haeds / block / head gasket when suddenly cold coolant enter in engine in those wot pulls ? So if you were me to replace thermostat is worth ? |
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