Any update about this from Navy?


I checked the fan wires,,, already hard wired and still having same overheating issue in traffic. Temps keep raising,,, last time it reached 244F and cools down whenever the roads open and moving.

the outside temp was 105F

My setup:
A&A supercharger + Dewitts radiator + Dewitts Dual Fan + z06 oil cooler behind the intercooler.

already checked the tune and chagned the thermostat three times!
any solution to try?

 

Move the oil cooler out from the flow of air for radiator. Put a seperate trans oil cooler also not in the path of air for radiator.

 

How many miles on the car? Take the radiator out and see if thee fins are clean. It seems unlikely since its an aftermarket radiator and probably pretty new but maybe there is a sand spider stuck in there.

Also, I just noticed you have the dewitts dual fans. There are a couple different ways to wire them. Do you know how yours are? I was troubleshooting a cooling issue with the dewitts fans and they were quiet like they were not running full bore.

 

Try removing the hood blanket. That saved me 10 degrees

 

As metioned, you want to make sure the fans are running as they should first. If that's not the problem, take another look at the tune. Advancing the timing at idle will reduce the amount of heat the engine retains and transfers to the coolant. I admit I know nothing about tuning these late model cars but idle overheating with older vettes (pre-ECM) was very often timing.

 

I have the dual fans from dewitts. What is the recomended way to wire them.

 

it is about air flow at idle or when car is at a stop. Intercooler restricts air flow. Take every thing you can out of air path through radiator.

 

^This

 

Gentlemen,

everything as in its correct OEM place + we add the A&A intercooler

so the intercooler will be in front blocking the air... but im not sure if that is the issue as many of the guys are happy with their A&A setup.

Another thing to think of : is the outside weather temperature of 105F ok for supercharged car even for normal driving?

the things I will try now starting by cheapest:
I will add the 40" below additive and test.
I will check the fans if they are running full power or not? I'm not sure how they wired it in the shop, but how can I tell the correct way?

next to think of maybe getting rid of the z06 oil cooler and get two small separate oil coolers but I'm afraid of oil pressure drops as reported by my friend's vette when he installed them! but certainly this helped them to keep the cooler much cooler than before.

Another idea, a small fan to be set beside the intercooler and to be triggered manually by a switch in stop situation.

Already now have a vented hood without blanket but still the temp raises.

Here is a little detail when I noticed the most that temp raises:
A/C is on and the car idling ==> temp is raising slowly
A/C is off and car is idling ==> temp drops slowly (with vented hood but not before!)

stop and go traffic, the temp raising with and without AC...
I noticed that when I step the gas or do a light acceleration till 4k RPM,, the temp will raise.

driving in highway with constant speed and very low RPM, will reduce the temp and cool it down
whenever you exceeds 3000rpm,, you can notice the temps is going up faster!

is there a problem with the engine ? I have a new built 416" LS3 and MAST heads.

 

I have a s/c 416 as well. I took the dewitts rad. and duel fans out and put the stock rad. back in. I ordered two 12" spal fans biult a shroud out of 1/8" aluminum and no longer have any temp. problems its an air flow problem and the dewitts compounds it as it is thicker causing more restriction. the two 12" spals pull 1630 scfm each they are the hi performance ones.

 

Water pump? You increased your radiator capacity but not coolant flow. The Meziere 55gph is a bad **** piece. Also, if you break a belt you still have the coolant pump.

I would be curious to look at your IAT v.s. Timing and see if these were changed from stock tune. The factory program doesn't pull timing in lower airflow cells.

Also, one more thought. What type of BOV do you have? Does it vent to the atmosphere or recirculate?

 

Like others have mentioned, it's an airflow problem. You added a big *** Z06 oil cooler that's blocking the radiator. So you now have the large A&A intercooler as well as the large oil cooler blocking the incoming air. Combine that with 105 F temps, and it's gonna struggle to stay cool. You also have a larger engine, which = more heat to remove.

For starters, remove or re-locate that oil cooler

 

EDIT: OOPS, sorry WS, I wasn't paying attention two who was reading what...Oh, well it's good to have these two threads linked. BTW, I think it's amazing that you're in Saudi, I'm in China, and we are working out technical problems on our sports cars with people in the US. Things can't be all bad!

Sorry, nothing to add - I'm in the same boat. Looking to optimize airflow through too many heat exchangers. I'm sure this is another in a long series of similar threads, but here is mine from the Tech/Performance board. It might help:

http://forums.corvetteforum.com/c6-t...ing-temps.html

 

I replaced the PCM that the dealer diagnosed as the problem. I started it up and after idling for 10 minutes the temp was at 230*F. Do I have to drive it first to break in the PCM?

It is 100*F outside. Is this ok for a supercharged engine?

For everyone suggesting answers, we're talking about IDLE temps. My temps are fine at interstate speeds.

 

Hi idle temp are normally caused by poor air flow thru the radiator. With the tight engine compartment in a Corvette it becomes an issue with getting the hot air out of the engine compartment. Anything you can do to improve air flow into the radiator and then getting the air out of the engine compartment will help relieve some of the issues you all are having. A higher flowing aftermarket water pump will also outperform any stock water pump. After market pumps are built to tighter tolerances and have better impellor designs that help to improve flow at lower speeds and use less HP. The other things people do is to under drive there system this will also reduce your flow at idle.

If you download the catalog from the Meziere.com website you will find in the back some great info about cooling and starting systems.

(Disclaimer: I work for Meziere as the phone tech guy) I’m not trying to sell anything just looking to help people out with their cooling and starting problems. JerryD@meziere.com

 

I wonder if it would help at all to get some kind of air flow through the engine compartment at idle/not moving by installing exhaust fans, say blowing out the side coves? They could come on when the car drops below a certain speed. Stupid idea?