440 Highway temps

[zombezoo]

Can you tell the efi to add more fuel at cruise? Or tell it to pull some timing? I don’t know what you have, just tossing that out there. Almost thinking the o2 is giving bad info or something like that.

A guy on Moparts has posted several times about a car in his shop having a new core that had weird overheating problems. He said he called green ray and the man himself said new cores aren’t made as well as they were in the day, but his were made to the old specs, not cost cutting ones. He pledged to personally fly to the shop if his radiator didn’t cure the issue and it did in fact solve the problem.

Read my mind, its a Fitech setup. I dont have timing control so I have a recurved factory unit. As for fuel I reset the fuel learning on the system and left the targets in the mid 13s, it did not make a difference.

The last thing before I replace the radiator with an aluminum unit will be to play with the timing some more. I bought one of those limiting plates for the factory distributor and I intend to make a shorter curve so I can run more initial. The idle is a lot smoother at 14+ base but the curve would be too aggressive at WOT. I currently run about 8 base.

 

[Some Car Guy]

Hmm. Setting the timing up that way would be nice, but I’m not thinking that is causing this.

What fan clutch? Maybe try a factory solid spacer just to see what happens. Hood seal could do something for this, but again seems like a reach to get temps where they should be. A Flowkooler and a clean radiator should be a desert cooler.

I’d give it a whirl with telling the ecu to run it at like 11.5-12 as the target at cruise and see what that does. Just as a quick test.

 

[josephqatarcarguy]

I have to believe that 110+ degree temps would be much worse for me. I can tell the difference between 80 and 90 degree days. Once the temps are in the 70s, the problem largely goes away.

i had the same symptoms ... temps down and it would be fine , lucas super coolant helps alot , try it

 

[josephqatarcarguy]

Read my mind, its a Fitech setup. I dont have timing control so I have a recurved factory unit. As for fuel I reset the fuel learning on the system and left the targets in the mid 13s, it did not make a difference.

The last thing before I replace the radiator with an aluminum unit will be to play with the timing some more. I bought one of those limiting plates for the factory distributor and I intend to make a shorter curve so I can run more initial. The idle is a lot smoother at 14+ base but the curve would be too aggressive at WOT. I currently run about 8 base.

i too run a fitech