Iam taking my car into the shop for some upgrades.

the tech recommended getting a dewitt radiator and upgraded fans to lower my coolent/oil temps.

however this seems NOT to be recommeded from the threads Ive read.

is it wiser to get a z06 oil cooler and mount it in front of the radiator ?

 

I did the Z oil cooler upgrade a couple of months ago and got great results. Temps dropped anywhere from 20-30deg in same driving conditions.

Can't comment on DeWitts though, sorry.

 

why were you told not to do the DeWitts?

 

I would highly recommend the Z06 cooler. I would also do the Alum radiator, but leave the cooler out of it or just do a trans cooler if you have one. The seperate Z06 style cooler can not be matched by any "built in" coolers. I have seen drops of over 30 degrees in regular driving and over 40 degrees under hard driving compared to stock setups on customers cars.

I got an RSD Aluminum radiator and could not be happier.

http://www.racespecialtydesigns.com/...&cat=55&page=1

 

richie can I get the z06 cooler and the rsd

 

bc it doesnt work nearly as well as an external z06 oil cooler (iam more concerned about oil temps)

 

They make the entire setup for C5's and C6's. I can forward you their email if it would help. They are great people!

 

you mean like a comprehensive cooling system?

 

I went with the Ron Davis w/ oil cooler on my LS2 stoker . . . about $1200 in cost. I felt it was really worth it. My oil temp hasn't got over 208 even with aggressive driving in the mountains for an hour at 75 degrees. Now, this was early November in GA, so I'm sure it will go a little higher in the summer, but I was told it wouldn't go much higher. The other thing I am impressed with is how much quicker your oil temp goes up after cranking. I usually hit 140 degrees on the oil in 35 degree weather in less than 2 miles going 35 mph. Dewitts are cheaper, and I have heard great things about them too. I'd rather have the capacity with fan programming and 160 degree stat vice the upgraded fans, but that's just my IMO. I went with my setup as I wanted to be able to track on occassion w/o too much worry. FMI, look at the link on C5 tech 06-08-2005, 01:55 PM that compares both Ron Davis and Dewitts . . . Dewitts is a forum vendor also.
Mike C sends

 

Sometimes people will recommend what they did to others before reviewing the application, factory equipment, and intended use. You didn't indicate any of these items, so I won't guess. You should call me tomorrow and I can help you make an educated decsion. 517-548-0600

Some here would lead you to believe that internal coolers are bad, they're not. The internal oil coolers we use are over twice as big as what any stock radiator would use, so that's a major upgrade if that's what you were using.

There are times when I will suggest going with the external (Z06) air type because internal coolers will transfer the heat to the coolant. If the radiator and fan system is robust enough to take it then there is no problem. Your own requirements need to be discussed in detail and I can do that with you.

 

We sell alot of radiators for C6's with internal oil coolers, that gives people more options for supercharging later. (The Z06 oil cooler will not work with the big intercoolers that comes with most kits like the A&A Vortech kits.) We also sell the Z06 collers and lines to hook it all up. The Chevrolet oil liine asembly comes with a built in bypass valve to make sure your oil pressure stays high even at high RPM's. Most aftermarket lines and adapters do not account for the increased volume that comes with high RPM's and can sometimes knock your oil pressure way down when on the track.
RichieRich's car ran about 225 degrees at the auto cross track before we installed the RSD all aluminum twin 1 1/4 core radiator. Now it rarely goes above 190 and cools right back down in the staging lane to about 178 or below.
Sometimes the oil cooler being in the rad increases coolant temp beyond the thermostat and sometimes the radiator does not allow you oil to get hot enough to burnoff water deposits. (min 200 degrees) I like the Z06 cooler until supercharging a C5 & C6, then you have to go another way, we can help there also.

PM me and let me know what you want, what you are trying to accomplish, and I can get more info to you. Mods can be expensive sometimes and better to get all the info.

Steve

 

allright everyone, here what I ended up doing .

Dewitt Radiator in conjunction with z06 oil cooler / will post pics review and data in regards to how much it helped.

 

stock fan?

 

no aftermarket

 

is it Dewitts too and does it plug into the OEM harness so your ECM controls it?

 

It does now

 

yeah I went with the dewitt fan as well.

 

Tom
did you come up with the fan control ??
pm me and let me know, I've been holding off doing it till
it got resolved,
thanks
Phil

 

is it the single or double? curved blade? Larger in size? How much more CFPM?

 

It is a dual fan, flat paddles, and almost double the factory cfm at 2760. Keep in mind, this is only designed to fit our Direct Fit radiator.

We now have a wiring schematic that allows you to run the fans directly from the ECM and no aftermarket switch. Since the factory fan plug will not handle the amperage, you will have to cut it off and splice wires. The fan utilize two heavy duty relays (included) to introduce the power to the fans, so aftermarket wire harnesses are still necessary.





http://www.dewitts.com/pages/product...asp?ProdID=427