Seems Like Its Running Hot
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
I just looked up a few posts on the Diablo site and I went into the tune and set my fans to come on earlier ..... was careful not to go above 90% as I don't want to fry the connectors or my pwm controller
Dave
Dave
Le Mans Master
Joined: May 2016
Posts: 7,189
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From: Florida
Race Director
Joined: Oct 2005
Posts: 14,999
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From: Bay Area Ca.
Good Q Bobby. So many people buy 160* thermostats for the same reasons they buy Regal Pink oil from Hawaiian boutique Oil company (made up name, no reference intended to any real boutique oil co) in place of the specced oil for their trans, diffs, engines and PS units. It's because someone is selling these items and they're good at selling. What makes the oils work is the chemistry is such a big mystery that people do it as a complete leap of faith. "Racer Tommy uses Regal Pink in all of his race cars so it's good enough for me" Racer Tommy is sponsored by Hawaiian Oil Co. But...hush hush on that.
The tstat should be a no brainer BC it's just simple science. How can a controller rated at 160* control temps when the op temps are considerably higher 200*+++? The funniest to me is reading a post that says - "I was running 220* 230* and I switched to a 160* tstat and I now never go above 190*"...WAIT....WHAT???...But, that's good salesmanship! So convincing that the buyer is in denial.
And, as stated, although not much an argument for you and me, I DON'T want a 160* tstat if I drive the car in Anchorage in December.
The tstat should be a no brainer BC it's just simple science. How can a controller rated at 160* control temps when the op temps are considerably higher 200*+++? The funniest to me is reading a post that says - "I was running 220* 230* and I switched to a 160* tstat and I now never go above 190*"...WAIT....WHAT???...But, that's good salesmanship! So convincing that the buyer is in denial.
And, as stated, although not much an argument for you and me, I DON'T want a 160* tstat if I drive the car in Anchorage in December.
I took my 160* stat out after one Winter in sunny California.
I was seeing 168-172* coolant temps. This was in the SF Bay Area too.
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
So tonight I talked my wife into going out for a ride with me to test the new fan settings as it was a nice night , of course it was not 97 degrees but it was 87 when we left . While driving the car held 192 to 194 with or without the air on
I beat on it a bit and it went up to 198 but as soon as I let off it , the Temps settled back to 192 to 194
Got stuck at one long light and it jumped to 205 but as soon as I started to move it came back down
Went up on the highway [ in mexico of course] nobody around for miles so really got into it coming down the entrance ramp and into the traffic lanes , into the 3 digits and never got above 196
Pulled into my driveway and sat there with the car in gear , air on and off and the highest it got was 205
The test will be tommorrow sitting in traffic all the way to work but I really think it was the fan settings
We shall see
Dave
I beat on it a bit and it went up to 198 but as soon as I let off it , the Temps settled back to 192 to 194
Got stuck at one long light and it jumped to 205 but as soon as I started to move it came back down
Went up on the highway [ in mexico of course] nobody around for miles so really got into it coming down the entrance ramp and into the traffic lanes , into the 3 digits and never got above 196
Pulled into my driveway and sat there with the car in gear , air on and off and the highest it got was 205
The test will be tommorrow sitting in traffic all the way to work but I really think it was the fan settings
We shall see
Dave
Le Mans Master
Joined: May 2016
Posts: 7,189
Likes: 1,546
From: Florida
So tonight I talked my wife into going out for a ride with me to test the new fan settings as it was a nice night , of course it was not 97 degrees but it was 87 when we left . While driving the car held 192 to 194 with or without the air on
I beat on it a bit and it went up to 198 but as soon as I let off it , the Temps settled back to 192 to 194
Got stuck at one long light and it jumped to 205 but as soon as I started to move it came back down
Went up on the highway [ in mexico of course] nobody around for miles so really got into it coming down the entrance ramp and into the traffic lanes , into the 3 digits and never got above 196
Pulled into my driveway and sat there with the car in gear , air on and off and the highest it got was 205
The test will be tommorrow sitting in traffic all the way to work but I really think it was the fan settings
We shall see
Dave
I beat on it a bit and it went up to 198 but as soon as I let off it , the Temps settled back to 192 to 194
Got stuck at one long light and it jumped to 205 but as soon as I started to move it came back down
Went up on the highway [ in mexico of course] nobody around for miles so really got into it coming down the entrance ramp and into the traffic lanes , into the 3 digits and never got above 196
Pulled into my driveway and sat there with the car in gear , air on and off and the highest it got was 205
The test will be tommorrow sitting in traffic all the way to work but I really think it was the fan settings
We shall see
Dave
That might be a reasonable tradeoff for you. On the other hand, the sensitive fans in the C6 won't take much overtaxing.
Please don't take this as critical, only meant to be thoughtful. If it were me, I MIGHT and only say might, tweak back in the other direction to see if I could get the 192/194 to 198/200 to save more of the fans...or....this is minutia...Ha, ha.. Midrange is the trick, that's where the engine is running the majority of the time.
What you doing in meheco??
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Yep, I found this post concerning this very subject Steve, for your consideration 
NSF
THERMOSTAT: Probably the most misunderstood component in the cooling system, the thermostat has absolutely nothing to do with controlling maximum engine operating temperature. Period.
NSF
THERMOSTAT: Probably the most misunderstood component in the cooling system, the thermostat has absolutely nothing to do with controlling maximum engine operating temperature. Period.
I think many of us like Gold72 have experienced a STICKING thermostat at one time or another
I am happy with my temps now that I changed the fan settings and I think the slow changes I am seeing up and down are normal but if I see them bouncing all around like they were doing no matter what MPH I was driving then replacing the thermostat is next for me
all you guys have been a big help !
Dave !
Le Mans Master
Joined: May 2016
Posts: 7,189
Likes: 1,546
From: Florida
NFS , I read this post also and really respect the author as I think he knows his stuff but the problem it is , it is assuming that you have a working thermostat ..... if you have one that is sticking like I think mine is then it has everything to do with maximum temperatures if it is sticking closed or only partially open
I think many of us like Gold72 have experienced a STICKING thermostat at one time or another
I am happy with my temps now that I changed the fan settings and I think the slow changes I am seeing up and down are normal but if I see them bouncing all around like they were doing no matter what MPH I was driving then replacing the thermostat is next for me
all you guys have been a big help !
Dave !
I think many of us like Gold72 have experienced a STICKING thermostat at one time or another
I am happy with my temps now that I changed the fan settings and I think the slow changes I am seeing up and down are normal but if I see them bouncing all around like they were doing no matter what MPH I was driving then replacing the thermostat is next for me
all you guys have been a big help !
Dave !
My suggestion is this (as before in this thread) - Just eliminate the tstat. Run through the rest of the warm weather with no tstat. Since you have good data above, compare it w/o a tstat. See if the #s are exactly the same or deviate. if they deviate, then you know the sticking tstat impacted your running temps. I have a side bet on the outcome.
Last edited by BlindSpot; Sep 19, 2016 at 08:49 PM.
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
My suggestion is this (as before in this thread) - Just eliminate the tstat. Run through the rest of the warm weather with no tstat. Since you have good data above, compare it w/o a tstat. See if the #s are exactly the same or deviate. if they deviate, then you know the sticking tstat impacted your running temps. I have a side bet on the outcome.
I am lazy and I don't like " Dirty Jobs so I am only going to do it once and I am going to change it out
Plus there is the chance that you can have to much flow thru the cooling system which is not good also as it does not allow the coolant time to dissipate heat while running thru the radiator ( from my days spent with a RAM AIR 4 Motor , what a heat monster that was )
Dave
Dave
Last edited by Dcasole; Sep 19, 2016 at 08:57 PM.
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Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Le Mans Master
Joined: May 2016
Posts: 7,189
Likes: 1,546
From: Florida
No prob...nothing gained, nothing lost.
Le Mans Master
Joined: Jan 2008
Posts: 6,457
Likes: 297
From: corpus christi Texas
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
So I drove it to work today with the new fan settings in place
97 degrees in the afternoon and humid as hell !!
Same route ,same traffic , same heat
The car never went over 205 in crazy stop and go traffic and once I got going on the side streets it would drop below 200
On the highway at 65 to 75 it was running 194 - 196
Sitting idle in my driveway for 20 minutes in gear with the air running it topped out at 214 and never went any higher
Feeling much better about things now
not sure why my fans were set so low .........
Dave
97 degrees in the afternoon and humid as hell !!
Same route ,same traffic , same heat
The car never went over 205 in crazy stop and go traffic and once I got going on the side streets it would drop below 200
On the highway at 65 to 75 it was running 194 - 196
Sitting idle in my driveway for 20 minutes in gear with the air running it topped out at 214 and never went any higher
Feeling much better about things now
not sure why my fans were set so low .........
Dave
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
Here is something to give you some perspective..On my 89 Corvette C4 the coolant temps had to get to 228 degrees before the fan even came on..
, this is how GM designed them.. 210 -220 degrees on a C6 Corvette is nothing......WW
.
.
, this is how GM designed them.. 210 -220 degrees on a C6 Corvette is nothing......WW.
.
Last edited by WW7; Sep 23, 2016 at 10:29 AM.
Thread Starter
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Been driving it all week with the new fan settings and it's running way cooler
I was just not comfortable with how hot it was running ....
Dave