DeWitts Test Data
Melting Slicks
Joined: Apr 2010
Posts: 2,790
Likes: 108
From: On the coast North of SF bay
Have brought this point up previously to mixed responses, but....
With the variances in the overheating issue being what they are, not all A8's and some M7's, my guess is there's an unknown issue at work with the Z overheating problem. A manufacturing defect in some part or another???
Nick
With the variances in the overheating issue being what they are, not all A8's and some M7's, my guess is there's an unknown issue at work with the Z overheating problem. A manufacturing defect in some part or another???
Nick
Last edited by pcguy2u; May 8, 2016 at 01:17 PM.
Racer
Joined: Apr 2007
Posts: 432
Likes: 50
From: central mountians colorado
[QUOTE=lawdogg149;1592169372]Tom
Dont beat yourself up just yet. Im positive we have a batch of good cars and bad. My prediction its in the intercooler pump wiring. I have personally seen cars ran same day same track fail while others complete the session. I have personally never had a failure of over heating even with my full tank of fuel run at road atlanta last year which equalled 38 minutes of straight track time.
I have seen 2 cars so far that had overheating issues have the intercooler pump and wiring harness replaced and both came back tracking with no issues.
This explains why some are better cooling than others.
GM had been made aware of this through the Tac call center.[/QUOTE
LawDogg, do you know how the owners convinced the dealer or GM to do this work? What is the procedure? Sure makes sense given some cars have the problem and some do not.
Tom, I admire your hard work and honesty on trying to solve this problem. You have a lot into this project. Not many people or vendors will give honest answers. You guys are one of the exceptions. BTW my DeWitts in my 65 impala big block and 69 C3 Solved those overheating problems!
Dont beat yourself up just yet. Im positive we have a batch of good cars and bad. My prediction its in the intercooler pump wiring. I have personally seen cars ran same day same track fail while others complete the session. I have personally never had a failure of over heating even with my full tank of fuel run at road atlanta last year which equalled 38 minutes of straight track time.
I have seen 2 cars so far that had overheating issues have the intercooler pump and wiring harness replaced and both came back tracking with no issues.
This explains why some are better cooling than others.
GM had been made aware of this through the Tac call center.[/QUOTE
LawDogg, do you know how the owners convinced the dealer or GM to do this work? What is the procedure? Sure makes sense given some cars have the problem and some do not.
Tom, I admire your hard work and honesty on trying to solve this problem. You have a lot into this project. Not many people or vendors will give honest answers. You guys are one of the exceptions. BTW my DeWitts in my 65 impala big block and 69 C3 Solved those overheating problems!
Last edited by rsilver; May 8, 2016 at 01:10 PM.
Melting Slicks
Joined: Apr 2016
Posts: 3,169
Likes: 861
From: Naples FL
Tom
Dont beat yourself up just yet. Im positive we have a batch of good cars and bad. My prediction its in the intercooler pump wiring. I have personally seen cars ran same day same track fail while others complete the session. I have personally never had a failure of over heating even with my full tank of fuel run at road atlanta last year which equalled 38 minutes of straight track time.
I have seen 2 cars so far that had overheating issues have the intercooler pump and wiring harness replaced and both came back tracking with no issues.
This explains why some are better cooling than others.
GM had been made aware of this through the Tac call center.
Dont beat yourself up just yet. Im positive we have a batch of good cars and bad. My prediction its in the intercooler pump wiring. I have personally seen cars ran same day same track fail while others complete the session. I have personally never had a failure of over heating even with my full tank of fuel run at road atlanta last year which equalled 38 minutes of straight track time.
I have seen 2 cars so far that had overheating issues have the intercooler pump and wiring harness replaced and both came back tracking with no issues.
This explains why some are better cooling than others.
GM had been made aware of this through the Tac call center.
Drifting
Joined: Jan 2005
Posts: 1,827
Likes: 301
From: Tucson Arizona
St. Jude Donor '08
Why would you start a test when the water/oil temps were clearly different when these values are the object of the test?
At the owners school my ZO6 was always allowed to reach 214+ ECT before it was taken on the track as they use the heavier Mobil 1 track focused oil.
Is too much being asked of a heavily Chevrolet subsidized facility to potentially prove that the OEM product is lacking?
At the owners school my ZO6 was always allowed to reach 214+ ECT before it was taken on the track as they use the heavier Mobil 1 track focused oil.
Is too much being asked of a heavily Chevrolet subsidized facility to potentially prove that the OEM product is lacking?
Thread Starter
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
That is a good question. I think we have great drivers and instructors but not analyst's. Twelve degrees isn't normally a big deal but in this case it could be the difference in faulting or not.
Melting Slicks
Joined: Apr 2016
Posts: 3,169
Likes: 861
From: Naples FL
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
A long time ago I took a course on designing experiments so you get the data you are looking for. My son has a friend who designs cooling systems for Ford. Maybe he would have some suggestions on how to structure an experiment so it provided the data required to make a decision. I will send my son an email and see if his friend is willing to comment on this.
Bill
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Racer
Joined: Apr 2007
Posts: 432
Likes: 50
From: central mountians colorado
Safety Car
Joined: Aug 2012
Posts: 3,960
Likes: 1,106
It will be interesting to see the additional info from Bill. The most desirable situation is when all things are equivalent except for the item under test. Given the rapid changes in environmental conditions and the need to have the same starting conditions it isn't practical in this test to quickly change systems in the same car so the next best thing is two identical cars, outside of the radiator, driven by the same driver under the same conditions back to back. Both vehicles need to have the same "pre-conditioning" in terms of fluid levels and temperatures. Once you have additional variables outside of the one you are trying to test things quickly get very complex and for testing a radiator it shouldn't be a problem to set up the test where a direct comparison can be made with all other factors being equal.
In my professional life I mainly dealt with designs in the social sciences. My respite from that was highly precise measurements in the electronics realm where you can confidently and easily measure to a few PPM instead of dealing with those messy people based measurements where as the saying goes the only facts at the end of the study are the artifacts of the study.
In my professional life I mainly dealt with designs in the social sciences. My respite from that was highly precise measurements in the electronics realm where you can confidently and easily measure to a few PPM instead of dealing with those messy people based measurements where as the saying goes the only facts at the end of the study are the artifacts of the study.
Le Mans Master
Joined: Sep 2003
Posts: 8,934
Likes: 657
From: Norwalk ohio
2019 Corvette of the Year Winner
St. Jude Donor '15
Radiator change only?
Is that correct? What I thought I read.
I have the cooling package from you on order and I just believe that it's a system and requires a system solution....which is why I bought your package.
I have the cooling package from you on order and I just believe that it's a system and requires a system solution....which is why I bought your package.
Last edited by firstgear; May 8, 2016 at 09:14 PM.
