DeWitts Radiator?
Thread Starter
Safety Car
Joined: May 2016
Posts: 4,626
Likes: 1,815
From: Erlanger, Kentucky
DeWitts Radiator?
Okay. I have an Edelbrock E-Force on order and in preparation I am trying to think of any supporting parts to go with it. The first is upgraded cooling in the form of a DeWitts radiator.
But I am having difficulty in figuring out the correct part number. I have a 2011 Grand Sport 6-spd manual so it is the dry sump oiling system. The DeWitts website says that I would need the 1139105A part number which is for Z06's and All Dry Sump engines.
But the Summit Racing website says that the A part number is not the correct one and the 1139105M part number is. This is for manual transmission cars.
From looking at a parts diagrams showing the cooler lines, it looks like the A part number is correct as it shows cooling lines running from the right side of the radiator back to the manual transmission, then to a small block shaped cooler.
But I am having difficulty in figuring out the correct part number. I have a 2011 Grand Sport 6-spd manual so it is the dry sump oiling system. The DeWitts website says that I would need the 1139105A part number which is for Z06's and All Dry Sump engines.
But the Summit Racing website says that the A part number is not the correct one and the 1139105M part number is. This is for manual transmission cars.
From looking at a parts diagrams showing the cooler lines, it looks like the A part number is correct as it shows cooling lines running from the right side of the radiator back to the manual transmission, then to a small block shaped cooler.
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
It use to be easier, automatics (A) had trans coolers built in and manuals (M) did not. Then in the last couple generation GM starting installing coolers in the radiator for other stuff, even with manual trans cars. The M would have no coolers so that would be wrong. Use the 105A
Racer
Joined: Nov 2009
Posts: 397
Likes: 35
Summit gave me the wrong part #, then asked me if it was an " automatic " , after I told them a 2008 Z06. Just go to Dewitts direct, talk to Jesse. Had I not double checked, Summit would have sold me a double row dual fan set up with no TOC. My Z has the air cooled EOC, and the TOC goes into the radiator.They Dewitts web site ) were about $30 more,,but the advice was way more informative in my opinion. I am ordering the 32- 413910A with TOC / Dual Spal fan..Double check is my advice to avoid the hassle. Summit has free shipping btw
Okay. I have an Edelbrock E-Force on order and in preparation I am trying to think of any supporting parts to go with it. The first is upgraded cooling in the form of a DeWitts radiator.
But I am having difficulty in figuring out the correct part number. I have a 2011 Grand Sport 6-spd manual so it is the dry sump oiling system. The DeWitts website says that I would need the 1139105A part number which is for Z06's and All Dry Sump engines.
But the Summit Racing website says that the A part number is not the correct one and the 1139105M part number is. This is for manual transmission cars.
From looking at a parts diagrams showing the cooler lines, it looks like the A part number is correct as it shows cooling lines running from the right side of the radiator back to the manual transmission, then to a small block shaped cooler.
But I am having difficulty in figuring out the correct part number. I have a 2011 Grand Sport 6-spd manual so it is the dry sump oiling system. The DeWitts website says that I would need the 1139105A part number which is for Z06's and All Dry Sump engines.
But the Summit Racing website says that the A part number is not the correct one and the 1139105M part number is. This is for manual transmission cars.
From looking at a parts diagrams showing the cooler lines, it looks like the A part number is correct as it shows cooling lines running from the right side of the radiator back to the manual transmission, then to a small block shaped cooler.
Former Vendor
Joined: Jan 2000
Posts: 5,593
Likes: 631
From: Brighton
Thread Starter
Safety Car
Joined: May 2016
Posts: 4,626
Likes: 1,815
From: Erlanger, Kentucky
I ended up purchasing the 1139105A radiator from Summit. They also have a sale right now on DeWitts. Price came out to be just $10 versus DeWitts. Ordered from Summit because there is a Summit store in Ohio that it is shipping from and I should receive the radiator today.
Drifting
Joined: May 2015
Posts: 1,525
Likes: 391
From: Martinez CA
Some of us Magnuson Heartbeat guys removed the stock Grandsport oil cooler, and just used the DeWitts radiator oil cooler when we swapped rads.
I'm really happy having done that, because the cooler works extremely well, plus it heats up the oil a lot faster that with the external.
Not to mention the better air flow...Then I sold mine here for a couple of buck...
My opinion, worth what you paid for it...
I'm really happy having done that, because the cooler works extremely well, plus it heats up the oil a lot faster that with the external.
Not to mention the better air flow...Then I sold mine here for a couple of buck...
My opinion, worth what you paid for it...
Thread Starter
Safety Car
Joined: May 2016
Posts: 4,626
Likes: 1,815
From: Erlanger, Kentucky
Some of us Magnuson Heartbeat guys removed the stock Grandsport oil cooler, and just used the DeWitts radiator oil cooler when we swapped rads.
I'm really happy having done that, because the cooler works extremely well, plus it heats up the oil a lot faster that with the external.
Not to mention the better air flow...Then I sold mine here for a couple of buck...
My opinion, worth what you paid for it...
I'm really happy having done that, because the cooler works extremely well, plus it heats up the oil a lot faster that with the external.
Not to mention the better air flow...Then I sold mine here for a couple of buck...
My opinion, worth what you paid for it...
I didn't get the upgraded fans. Going to see how well things run with the stock fans.
Supposed to have the E-force kit delivered on Monday. Going to try to do a bit of prep work during the week and finish the install on the weekend. Hopefully, the weather cooperates.
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Drifting
Joined: May 2019
Posts: 1,732
Likes: 667
From: Lakeland, Florida
How has your experience been with the DeWitts radiator with Dual SPAL fans ? My mechanic just received this unit for my 2012 Grand Sport manual transmission, not installed yet, so i do have time to exchange the 4139105A for the unit without the fans 1139105A and use the OEM fan. My car is NA, mild cam, headers, tune.
- Does the OEM ACDelco alternator handle the dual fans draw or is a larger amp alternator required ?
- Is any custom wiring required ?
Le Mans Master
Joined: Dec 2005
Posts: 6,995
Likes: 1,680
From: Southeast TX
No reason for the fan upgrade unless you have something like a big heat exchanger blocking air flow through the radiator. I ran the same setup as Chiselchst (stock fan). Even with the small Maggie heat exchanger in front there were no issues with cooling. I could idle it standing still with the a/c blowing cold in hot assed Tx weather and engine temps stayed under 200. As soon as you started moving it went down to 175 to 185. In cool weather, it ran too cool with a 160* stat. If I had that one to do over, I would use a 180* stat.
Drifting
Joined: May 2019
Posts: 1,732
Likes: 667
From: Lakeland, Florida
No reason for the fan upgrade unless you have something like a big heat exchanger blocking air flow through the radiator. I ran the same setup as Chiselchst (stock fan). Even with the small Maggie heat exchanger in front there were no issues with cooling. I could idle it standing still with the a/c blowing cold in hot assed Tx weather and engine temps stayed under 200. As soon as you started moving it went down to 175 to 185. In cool weather, it ran too cool with a 160* stat. If I had that one to do over, I would use a 180* stat.
Would a larger amp alternator be required to handle the draw of the two fans ???
Also, what is considered "too cool" and do i run the risk of that using the dual SPAL fans with the rad upgrade ???
Le Mans Master
Joined: Dec 2005
Posts: 6,995
Likes: 1,680
From: Southeast TX
In cool weather, it would not get much over 165*. That's running too cool in my book. And you don't have a heat exchanger blocking airflow. If you're bound and determined to light a few benjamins afire to make an "improvement" that's absolutely not needed, it's your money and time that will be wasted.
Advanced
Joined: Jul 2021
Posts: 81
Likes: 4
From: Carthage, MO
My 08 base would hit 230 in traffic with AC on. The intercooler made the stock fan barely able to keep up. The tuner set the fan to run hard from start up. Of course, the connector was melted from the high current. I bought direct fit short Dewitt’s Prospeed fans and while pricey they are awesome. The plug now carries light load to the controller and the fans are powered from the fuse box post. No more pucker factor.