DeWitt radiator
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
Understatement at that - if you all think I have a lot of irons in the fire, Ben has twice as many and multiplied across at least 2 other platforms at the moment (new CTS-V and ATS-V) on top of the C7 development. 
Melting Slicks
Joined: Aug 2000
Posts: 3,439
Likes: 977
From: Overland Park KS
This is an impressive review. Best data we've seen so far on the DeWitts. Unfortunately, to me the data says that the improvement is insignificant. Overheating occurred on lap 6, just as with the OEM unit. If I had to look at the two comparison dates and figure out which one has the better cooling I really couldn't tell.
It is becoming more and more clearer that we need an additional core with additional airflow to cool this car down. The horizontal oil cooler that some companies are working on seems to be the only realistic fix. IMO the M7 is the only C7 Z06 that can be made to run cool because the manual transmission doesn't need the additional front mounted cooler.
It is becoming more and more clearer that we need an additional core with additional airflow to cool this car down. The horizontal oil cooler that some companies are working on seems to be the only realistic fix. IMO the M7 is the only C7 Z06 that can be made to run cool because the manual transmission doesn't need the additional front mounted cooler.
Bish
Le Mans Master
Joined: Apr 2010
Posts: 8,788
Likes: 164
From: Beaverton OR
Le Mans Master
Joined: Apr 2010
Posts: 8,788
Likes: 164
From: Beaverton OR
Safety Car
Joined: Nov 2012
Posts: 4,737
Likes: 551
From: North California
I don't agree. The number of A8s I'm sure will be markedly greater than the number of M7's, hence any vendor wishing to generate as much income as possible had best design a system that does work for the A8 optioned car. It will be possible, someone just needs to take the time to see if a Setrab core behind the existing radiator; sandwiched after the secondary transmission oil cooler, etc. will work.
Bish
Bish
The second transmission cooler is not in the same plane as the main radiator so a sandwich is not possible. If you place an extra core behind the main radiator that's 4 cores in a row. Not only will it inhibit the main radiator's function but it simply won't have sufficient airflow.
Placed in the same plane as the trans core it will be in direct path of the intercooler. Therefore it will inhibit the function of the supercharger, engine cooing, and A/C.
Everything is possible of course, with enough money, it's just that I don't see any vendors biting for something so expensive that only a few people can buy. The A8 needs a new bumper design, with additional fascia inlets and possibly fender well outlets. That means a near total redesign.
Safety Car
Joined: Aug 2012
Posts: 3,960
Likes: 1,106
The A8 seems to be running at very safe temperatures so an aftermarket compromise may be a better radiator (DeWitts) along with a replacement for the front transmission cooler that shrinks it slightly and uses some of the vacated space for an EOC. This might provide sufficient cooling for the majority of A8 track users.
Racer
Joined: Sep 2013
Posts: 387
Likes: 53
I believe you want to reprogram the fans to come on earlier, like 195 ish. For high level racing, I would run two separate coolant packages. Run straight distilled water with a surfactant like Wetter Water. When you are done racing, drain in out and save that mix. Re-install the factory 50/50. I don't think it would help much but you could also go with a lower thermostat to start cooling earlier. Those items shouldn't void any warranty.
Can you tell if this is the newer version or older version ?
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Racer
Joined: Sep 2013
Posts: 387
Likes: 53
Just an FYI, I bought this a few days ago. I called your company to get the correct part number and asked if there was anyway of mixing them up and I was told there was not. Now I will have to ship this back to get a refund and source another one. I have a pre paid COTA track day Sunday that I will now miss due to miss information from Dewitts directly. Huge pain in the a** I did my best to avoid 
Can you guide me to where to purchase the newest version and get me the correct part number please.
Thanks
Can you guide me to where to purchase the newest version and get me the correct part number please.
Thanks
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
Just an FYI, I bought this a few days ago. I called your company to get the correct part number and asked if there was anyway of mixing them up and I was told there was not. Now I will have to ship this back to get a refund and source another one. I have a pre paid COTA track day Sunday that I will now miss due to miss information from Dewitts directly. Huge pain in the a** I did my best to avoid
Can you guide me to where to purchase the newest version and get me the correct part number please.
Thanks
Can you guide me to where to purchase the newest version and get me the correct part number please.
Thanks
Many people call here for technical assistance, pricing, and other details and then go somewhere else to purchase the product in an attempt to save a few dollars. What we offer today is the 2nd design and there is no way to order the wrong one FROM US. In this case you purchased the radiator from Summit and they must have had one of the 1st designs in stock.
Since the race is Sunday and today is Friday there is nothing I can do to get you a 2nd design radiator in time. The only options are A) Use that radiator B) Send it back to Summit. If you choose B, then you can re-order it from us and you will get the 2nd design. We also will be posting our annual sale (15% off) in a couple days so this might be the time to do that.
If you still want to talk with me, call the office 517-548-0600
Tom
Last edited by Tom@Dewitt; Jan 8, 2016 at 10:25 AM.
Racer
Joined: Sep 2013
Posts: 387
Likes: 53
Chris,
Many people call her for technical assistance, pricing, and other details and then go somewhere else to purchase the product in an attempt to save a few dollars. What we offer today is the 2nd design and there is no way to order the wrong one FROM US. In this case you purchased the radiator from Summit and they must have had one of the 1st designs in stock.
Since the race is Sunday and today is Friday there is nothing I can do to get you a 2nd design radiator in time. The only options are A) Use that radiator B) Send it back to Summit. If you choose B, then you can re-order it from us and you will get the 2nd design. We also will be posting our annual sale (15% off) in a couple days so this might be the time to do that.
If you still want to talk with me, call the office 517-548-0600
Tom
Many people call her for technical assistance, pricing, and other details and then go somewhere else to purchase the product in an attempt to save a few dollars. What we offer today is the 2nd design and there is no way to order the wrong one FROM US. In this case you purchased the radiator from Summit and they must have had one of the 1st designs in stock.
Since the race is Sunday and today is Friday there is nothing I can do to get you a 2nd design radiator in time. The only options are A) Use that radiator B) Send it back to Summit. If you choose B, then you can re-order it from us and you will get the 2nd design. We also will be posting our annual sale (15% off) in a couple days so this might be the time to do that.
If you still want to talk with me, call the office 517-548-0600
Tom
Last edited by cheet_code; Jan 8, 2016 at 10:53 AM.