jagman Posted July 7, 2011 Share Posted July 7, 2011 even better then if thats the case it will maintain 85c, i assume mine has an 88c in it as it maintains 91 c and only goes up or down 1d from that so the cooling system is doing its job perfectly, if i was on a 82c stat and it went up 10c to 92c under hard use it wouldnt sustain 92c as the cooling system wouldnt be doin its job so the temps would keep rising. No- The cooling system can only extract heat relative to flow - any stat can only open to a max , if the heat isnt extracted fast enough ,the cooling temp only reaches a set amount - the oil temp rises ,and the head temp rises If the coolant temp rises ,you would have major problems ,head and oil temps would be real high! simply looking at coolant temp is not enough to say its fine and under control ,any rise in coolant in driving conditions is not good ,stationary is another matter as the system is undercooled and uses the fan to regulate as the engine is off load The water system is not a stand alone cooling system but works in conjunction with oil and air ,all three are interlinked. the opening stat temp if lower simply slows the oil warm up time and engine warm up time its the max open temp that controls the running temp by controlling flow- maximum flow is when you remove the stat altogether , but now the engine is overcooled for most of the time and very slow oil warm up along with engine warm up and unstable block and head temps Quote Link to comment Share on other sites More sharing options...
Scott Posted July 7, 2011 Author Share Posted July 7, 2011 90916-03093 Thanks mate No- The cooling system can only extract heat relative to flow - any stat can only open to a max , if the heat isnt extracted fast enough ,the cooling temp only reaches a set amount - the oil temp rises ,and the head temp rises If the coolant temp rises ,you would have major problems ,head and oil temps would be real high! simply looking at coolant temp is not enough to say its fine and under control ,any rise in coolant in driving conditions is not good ,stationary is another matter as the system is undercooled and uses the fan to regulate as the engine is off load The water system is not a stand alone cooling system but works in conjunction with oil and air ,all three are interlinked. the opening stat temp if lower simply slows the oil warm up time and engine warm up time its the max open temp that controls the running temp by controlling flow- maximum flow is when you remove the stat altogether , but now the engine is overcooled for most of the time and very slow oil warm up along with engine warm up and unstable block and head temps That was my thinking of it all, I couldn't see how the earlier action would mean the flow changed once everything was up to temp. I'm not fussed about it opening earlier, I don't need to worry about the temps rocketing due to tracking etc..... if the day ever comes I'll take the stat out Quote Link to comment Share on other sites More sharing options...
hodge Posted July 7, 2011 Share Posted July 7, 2011 I fitted 1 to my build. An essential for a single build if you ask me. Quote Link to comment Share on other sites More sharing options...
Scott Posted July 7, 2011 Author Share Posted July 7, 2011 I fitted 1 to my build. An essential for a single build if you ask me. Any reasons John? Looking for information on why to fit one over stock Quote Link to comment Share on other sites More sharing options...
Homer Posted July 7, 2011 Share Posted July 7, 2011 I fitted 1 to my build. An essential for a single build if you ask me. Why? I don't see any good reason why a single turbo conversion should require one of these. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 8, 2011 Share Posted July 8, 2011 I've always been paranoid about boiling my engine when I first fired it up after dropping all the coolant, it happened with my blue car when I first built the engine, it was a learning curve I know and wouldn't happen again but it makes me paranoid all the same. I think the They open 10 degrees earlier so anything that can aid cooling is a must for me, especially with an engine running a hot single turbo. Quote Link to comment Share on other sites More sharing options...
scoooby slayer Posted July 8, 2011 Share Posted July 8, 2011 No- The cooling system can only extract heat relative to flow - any stat can only open to a max , if the heat isnt extracted fast enough ,the cooling temp only reaches a set amount - the oil temp rises ,and the head temp rises If the coolant temp rises ,you would have major problems ,head and oil temps would be real high! simply looking at coolant temp is not enough to say its fine and under control ,any rise in coolant in driving conditions is not good ,stationary is another matter as the system is undercooled and uses the fan to regulate as the engine is off load The water system is not a stand alone cooling system but works in conjunction with oil and air ,all three are interlinked. the opening stat temp if lower simply slows the oil warm up time and engine warm up time its the max open temp that controls the running temp by controlling flow- maximum flow is when you remove the stat altogether , but now the engine is overcooled for most of the time and very slow oil warm up along with engine warm up and unstable block and head temps the only way anything you have wrote is relevant is if the trd stat opens wider than a stock one ? if it doesnt then what ive said is correct. Quote Link to comment Share on other sites More sharing options...
Scott Posted July 8, 2011 Author Share Posted July 8, 2011 the only way anything you have wrote is relevant is if the trd stat opens wider than a stock one ? if it doesnt then what ive said is correct. That's not how I read it. His point is that they don't open wider hence they make no difference to the operating temperature. The operating temperature is governed by the cooling system as a whole, not when the thermostat comes in. The only difference here is that it will take longer for everything to warm up. This is obviously an advantage when you are taking your car out to cane it as the temps will rise quickly, the stock thermostat might not react quickly enough to the rapidly rising temperatures and might overheat. With the TRD it opens 10 degrees earlier so the full cooling system, radiator etc, is already in full use giving that extra 10 degree cushion. That's how I understand it anyway. Oh, and that's no use to me as when I'm caning it the engine will already be up to full temperature etc Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 8, 2011 Share Posted July 8, 2011 Someone mentioned removing the `stat altogether earlier. this is BAD BAD BAD. Modern engines have a calculated and physically measured flow and pressure drop around the head and block, and the way the 2JZ `stat operates has a profound effect on this. Removing it altogether could actually cause nucleate boiling and / or a far less efficient cooling system. There are very good reasons why you would NOT want to run a lower than stock coolant temperature actually, and I can think of very few good reasons to run the TRD `stat. Quote Link to comment Share on other sites More sharing options...
Scott Posted July 8, 2011 Author Share Posted July 8, 2011 Someone mentioned removing the `stat altogether earlier. this is BAD BAD BAD. Modern engines have a calculated and physically measured flow and pressure drop around the head and block, and the way the 2JZ `stat operates has a profound effect on this. Removing it altogether could actually cause nucleate boiling and / or a far less efficient cooling system. There are very good reasons why you would NOT want to run a lower than stock coolant temperature actually, and I can think of very few good reasons to run the TRD `stat. I was joking Chris Quote Link to comment Share on other sites More sharing options...
scoooby slayer Posted July 8, 2011 Share Posted July 8, 2011 (edited) That's not how I read it. His point is that they don't open wider hence they make no difference to the operating temperature. The operating temperature is governed by the cooling system as a whole, not when the thermostat comes in. The only difference here is that it will take longer for everything to warm up. This is obviously an advantage when you are taking your car out to cane it as the temps will rise quickly, the stock thermostat might not react quickly enough to the rapidly rising temperatures and might overheat. With the TRD it opens 10 degrees earlier so the full cooling system, radiator etc, is already in full use giving that extra 10 degree cushion. That's how I understand it anyway. Oh, and that's no use to me as when I'm caning it the engine will already be up to full temperature etc but they will make a difference to the operating temperature as its the stat that controls the temp by when it opens and closes, the operating temperature isnt controlled by how far the stat opens, but by what temp it opens at. the radiator and cooling system is only relevant to try and control the temp above stat temp as the rad doesnt see any water until stat opens. some of the post your refering to is actaully incorrect as lined out above. Edited July 8, 2011 by scoooby slayer (see edit history) Quote Link to comment Share on other sites More sharing options...
scoooby slayer Posted July 8, 2011 Share Posted July 8, 2011 Someone mentioned removing the `stat altogether earlier. this is BAD BAD BAD. Modern engines have a calculated and physically measured flow and pressure drop around the head and block, and the way the 2JZ `stat operates has a profound effect on this. Removing it altogether could actually cause nucleate boiling and / or a far less efficient cooling system. There are very good reasons why you would NOT want to run a lower than stock coolant temperature actually, and I can think of very few good reasons to run the TRD `stat. agreed Quote Link to comment Share on other sites More sharing options...
Scott Posted July 8, 2011 Author Share Posted July 8, 2011 but they will make a difference to the operating temperature as its the stat that controls the temp by when it opens and closes, the operating temperature isnt controlled by how far the stat opens, but by what temp it opens at. the radiator and cooling system is only relevant to try and control the temp above stat temp as the rad doesnt see any water until stat opens. So you're saying that running a TRD stat would see constant 74 degree temps? Quote Link to comment Share on other sites More sharing options...
scoooby slayer Posted July 8, 2011 Share Posted July 8, 2011 So you're saying that running a TRD stat would see constant 74 degree temps? if its a 74d stat then yes it will as the stat opens and lets water flow from the engine to the radiator to be cooled, ive had a drilled stat in a skyline and temps would only go above 75c in traffic never on the move as the radiator was holding temps at 75c. it wont in traffic as thats dependant on the fan cut in switch temp. Quote Link to comment Share on other sites More sharing options...
Scott Posted July 8, 2011 Author Share Posted July 8, 2011 if its a 74d stat then yes it will as the stat opens and lets water flow from the engine to the radiator to be cooled, ive had a drilled stat in a skyline and temps would only go above 75c in traffic never on the move as the radiator was holding temps at 75c. it wont in traffic as thats dependant on the fan cut in switch temp. There has to be a bottom level though, there has to be a point where the stat is fully open all of the time and the system is running at it's coolest. You couldn't stick in a 20 degree stat and see 20 degree temps for example. Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 8, 2011 Share Posted July 8, 2011 I have a trd stat, my car sits around 87-91 when fully up to temp, 87 is when my fans turn off, 91 is when they turn on. Quote Link to comment Share on other sites More sharing options...
Scott Posted July 8, 2011 Author Share Posted July 8, 2011 I have a trd stat, my car sits around 87-91 when fully up to temp, 87 is when my fans turn off, 91 is when they turn on. That was kind of my thinking. The stock system will run around 90 degrees. It won't really matter how much of a lower thermostat you have in there as it will only come into play at the level it opens at until the level it sits at normally. Quote Link to comment Share on other sites More sharing options...
scoooby slayer Posted July 8, 2011 Share Posted July 8, 2011 I have a trd stat, my car sits around 87-91 when fully up to temp, 87 is when my fans turn off, 91 is when they turn on. is that in traffic though jamie ? if your cruising along with a 74c temp stat then temps should be around 74c. all this thread makes no sense to me, im a mechanic by trade ive run an engine with no stat and it wouldnt even get hot enough to get the heater warm enough to demist properly on a mk2 escort 1600 crossflow, the stat is what regulates the temperature, same as when they stick shut will overheat as no water gets through the radiator, its the stat that regulates when the water goes from just flowing around the engine to flowing through the radiator for cooling. Quote Link to comment Share on other sites More sharing options...
jagman Posted July 8, 2011 Share Posted July 8, 2011 Stats are flow control devices , thats why they are the shape they are and move as they do . Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 8, 2011 Share Posted July 8, 2011 is that in traffic though jamie ? if your cruising along with a 74c temp stat then temps should be around 74c. Mine are never that low, i dont study the temps as its not on my main screen, i have to flick though to see it, i have a light that comes on when my fans kick in, its never on when im on the motorway but the fans kick in and out when im driving about on b roads. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 8, 2011 Share Posted July 8, 2011 Mine never goes that low either. The car sits at 91/92 degrees all the time. I've never took it for a long motorway run yet just on B roads so can't comment on that as yet. Quote Link to comment Share on other sites More sharing options...
jagman Posted July 8, 2011 Share Posted July 8, 2011 The stat has an opening temp - this is the temp at which the rapid engine temp climb (stat closed) is started to be slowed down - then the stat controls this slowed rise upto its full open temp the full open temp is what you see on the temp guage as normal so if you now floor the car and maintain a very high constant speed - the water pump runs faster and stat stays full open - the water temps stay normal BUT the oil temps rise - excess heat is going to oil as the water system is maxxed out -no more flow is available -stat open and pump high speed Along with oil temp rising the cylinder head temp rises and the cylinder wall temp rises - these all inpact the detonation point of the engine and the exhaust valve temps Quote Link to comment Share on other sites More sharing options...
Thomas.B Posted July 8, 2011 Share Posted July 8, 2011 Does anyone have an extra Standard Thermostat for sale? Pm please Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 8, 2011 Share Posted July 8, 2011 I have a new standard thermostat in stock, can't you just buy one over there though? Happy to send it, seems an expensive way to get one, that's all. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 13, 2011 Share Posted July 13, 2011 Cosworth now list cooler opening `stats : http://www.cosworthperformance.com/store/pc/viewPrd.asp?idcategory=103&idproduct=857 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.