Mark_Kovalsky
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Re: Transmission oil coolers and how cool should you go.
Terryallan wrote: Ben. My trans cooler is AFTER the radiator, not before it. So the fluid goes straight from the cooler to the trans, and not back thru the radiator. That is the way all the OEMs route the fluid if there is both an in tank cooler and an air to oil cooler. I studied the competition when I was an automatic transmission cooling engineer at Ford. I don't see any reason why you would want to run the in tank cooler after the air to oil. The purpose of the transmission cooling system is to cool the ATF. The most efficient way to do that is to run the air to oil cooler after the in tank cooler. Newer transmissions have a thermostat the bypasses the cooler until the trans reaches a preset temperature. There is no need to warm the trans fluid outside of the transmission. And the thermostat is a wax pellet type, it is not computer controlled in any way.865Views0likes0CommentsRe: Bypass radiator/tranny cooler combo?
ktmrfs wrote: One thing that somewhat baffles me is using the radiator to warm AFT fluid at startup. THE RADIATOR COOLER *NEVER* WARMS THE TRANSMISSION FLUID. NOT IN HOT WEATHER, AND CERTAINLY NOT IN COLD WEATHER. EVER. ktmrfs wrote: radiator doesn't really start getting warm until the engine is warm enough to open the thermostat. by then in most cases I'd guess the torque converter slip has already warmed up transmission fluid, especially in any stop and go driving. and in the meantime your running hot fluid through a cold radiator. In cold weather the cold side of the radiator, where the transmission cooler is located, only gets a few degrees above ambient tamperature. The thermostat isn't open for a long time, so the coolant has a long dwell time in the radiator. That gives the cold air flowing through the radiator plenty of time to get the coolant almost down to ambient temperature before it gets to the trans cooler. ktmrfs wrote: Now maybe in extremely cold weather it will help keep the fluid warm enough once the thermostat opens, No. See above.784Views0likes0CommentsRe: Bypass radiator/tranny cooler combo?
Turtle n Peeps wrote: I didn't disagree with Mark at all. I didn't know where his temps were taken and still don't for that matter. When I was doing cooling tests at Ford I had anywhere from 50-200 thermocouples throughout the powertrain. I had thermocouples in the ATF line into the radiator cooler, out of the radiator cooler, and out of the aux cooler. I also had thermocouples inside the radiator reading engine coolant around the transmission cooler. I had about 20 throughout the trans so that I could map the temperature gradiant inside the trans. I had them in the radiator's upper and lower coolant hoses. I had a series of them mapping the air temp into and out of the radiator. I had them outside the trans to get an idea of the air temperature around the transmission. Turtle n Peeps wrote: Let me say it one more time. "If" ATF temps are higher than the ECT's "at all times" we are all in agreement. I can't say that. What I can say is that after extensive testing in ambients from -40°F up to +115°F I never found a condition where the temperature inside the radiator around the transmission cooler where the coolant was warmer than the ATF. ECT often was, but that's irrelelvant. What matters is the temperature near the cooler, and I maintain that it is ALWAYS colder than the ATF.784Views0likes0CommentsRe: Tow/Haul Mode (is it needed in my case)
mkirsch wrote: Exactly what Tow/Haul mode does differs from brand to brand, and year to year. On some trucks, particularly older Fords, it does lock out overdrive. Ford NEVER produced a truck with tow/haul that locks out overdrive. I was an automatic transmission engineer at Ford. I think I know where you're getting confused. Before 2003 Ford didn't have a tow/haul feature. They had a button on the end of the shift handle that was labeled OD OFF. That button ONLY turned off overdrive. Many people called it tow/haul, but it was not. It didn't change any operating conditions, except it turned off overdrive.990Views0likes0CommentsRe: Any benefits to high octane
You don't need higher octane in high altitude. The mean effective pressure in the cylinder is lower due to the lower density air, so you actually can use lower octane fuel. That's why the octane ratings at the gas stations at high altitude are lower than at sea level.238Views0likes0CommentsRe: Titling/registration nightmare. Advice?
You didn't say which is your home state. When I needed to do this when I lived in Michigan I found this: You do not need a license plate to drive a newly purchased vehicle directly home within Michigan within three days of purchase. Carry the assigned title and proof of insurance with you. Never use a plate from another vehicle as a substitute. Michigan Secretary of State Website368Views0likes0CommentsRe: Trans cooler fliud route
BenK wrote: In front of the main coolant radiator...it can be over cooled but the main radiator will then heat up the ATF. No, the main radiator WILL NOT heat up the ATF. Ever. In any cold ambient. Ever. See my post above for the explanation, I'm not typing it again.268Views0likes0Comments
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