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LS thermostat talk
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<blockquote data-quote="tallnate" data-source="post: 537827" data-attributes="member: 3217"><p>I might be telling you stuff you already know but I have done a lot of research on this... definitely don't consider myself an expert by any means. I fight coolant temp issues in mine at times but my problem is 100% a capacity issue.</p><p></p><p>1. Air / fuel ratios can easily influence your coolant temps. Does your engine run on a closed loop system meaning does the ECU receive O2 sensor readings so that it can constantly modify it's timing and fuel maps?</p><p>2. The correct temp thermostat is important especially with LS motors running on a closed loop system because the ECU is tuned to keep the engine coolant temp at the factory operating temp based on the factory thermostat temp. </p><p>3. It is important to run a thermostat as opposed to no thermostat at all. Running without a thermostat will allow coolant to circulate too quickly which can result in fluid cooling too much after a period of easy running or not cool enough under periods of heavy throttle. Again, this is necessary because engines are tuned and air / fuel tables are set at full operating temp. A closed loop system will run on the lean side until it sees the coolant temp at the set thermostat temp.</p><p>4. Are your steam ports hooked up? I know mast likes to block them but I've read a lot of articles on the effectiveness and importance of leaving these hooked up.</p><p></p><p>Now if you run an open loop (a pre-set loop tune based on rpm's alone) it's hard to say. Since you're sure you have plenty of cooling capacity, and you were getting a little warm when just cruising around, my guess would be that your tune runs a little on the lean side in the 2-3k rpm range. Lean air / fuel ratios make big power but also make big heat.</p></blockquote><p></p>
[QUOTE="tallnate, post: 537827, member: 3217"] I might be telling you stuff you already know but I have done a lot of research on this... definitely don't consider myself an expert by any means. I fight coolant temp issues in mine at times but my problem is 100% a capacity issue. 1. Air / fuel ratios can easily influence your coolant temps. Does your engine run on a closed loop system meaning does the ECU receive O2 sensor readings so that it can constantly modify it's timing and fuel maps? 2. The correct temp thermostat is important especially with LS motors running on a closed loop system because the ECU is tuned to keep the engine coolant temp at the factory operating temp based on the factory thermostat temp. 3. It is important to run a thermostat as opposed to no thermostat at all. Running without a thermostat will allow coolant to circulate too quickly which can result in fluid cooling too much after a period of easy running or not cool enough under periods of heavy throttle. Again, this is necessary because engines are tuned and air / fuel tables are set at full operating temp. A closed loop system will run on the lean side until it sees the coolant temp at the set thermostat temp. 4. Are your steam ports hooked up? I know mast likes to block them but I've read a lot of articles on the effectiveness and importance of leaving these hooked up. Now if you run an open loop (a pre-set loop tune based on rpm's alone) it's hard to say. Since you're sure you have plenty of cooling capacity, and you were getting a little warm when just cruising around, my guess would be that your tune runs a little on the lean side in the 2-3k rpm range. Lean air / fuel ratios make big power but also make big heat. [/QUOTE]
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