should external trans radiator be inline with radiator compartment

[ybl8te]

got told today by a very old guy who has done radiators all his life - that 95% of people have their external radiator for the transmission only - wrong he say's.

Should be in series with the supplied twin radiator for the engine and engine radiator plus the external radiator for the transmission.......if any of ya all can understand that mouth full...


what do you guys wreckon

[Jacko84]

What The? plz explain

[delcowizzid]

i allways tell people to keep the internal radiator trans cooler and run the external as well its pretty common knowledge thats how it should be done.the trans fluid is well above coolant temp when it gets to the radiator chopping any temp out before it gets to the transcooler is allways good.plus it helps bring the trans fluid up to temp faster which saves n wear

[Jacko84]

+1 delcowizzard

[Brett_jjj]

+2.................,

[wraith]

The way I see it if Holden run it that way then it's for a reason.

[Andrew426]

Agreed, that way when you are sitting in traffic (or doing skids, or whatever) and have no airflow over your external cooler, your trans fluid is still being cooled by the engine coolant..

The coolant temp is regulated by your thermostat, and your electric fans - so its still kept in check when sitting in traffic

[ybl8te]

ok - now the new radiator is in - i am going to series the external and internal transmission radiators up -

One question to check before i do-------

The fluid from trans goes to the water radiator first then the air radiator or vice versa........and fluid from the trans goes in the top of the radiators first then out on bottom back to the transmission ???????

[ybl8te]

I found this post some where - talking about another person's set up



"Your set up is taking trans fluid that is roughly 220* coming out of the trans,running it through the ext trans cooler and droping it to 190 or so then running it through the radiator cooler only to raise the trans fluid tep up to roughly 210* in which you effectively done squat at reducing the trans fluid tep.
As far as the trans fluid warming up the radiator fluid and making the motor run hotter and in turn loose power, not going to happen. Why you might ask well for one thing even if the radiator fluid was 20* cooler you might gain 5hp if that. It won't matter if you dump extra heat into the radiator fluid as the system is designed to handle that heat and disipate it to the air and your motor will still see a coolant tep of 210* reguardless as the fan tep settings as well as the thermostat work together at keeping a constant 210*. Here is a simple example for you to understand what im saying. If the outside air is 30* what is your motor tep when its warmed up--um 210*. Now what is the motor temp in the summer if the outside air is 90* yea you guessed it 210*. How could the radiator fluid still be 210* in the summer when your putting 60* hotter air through the radiator. It simply disipates it more due to the run time of the fans to keep the temp @210. So you see it won't matter if you have the trans fluid thats hotter,run through the radiator as the fans will still keep the radiator fluid @ 210. If you really want to cool the motor down you going to have to A. Replace the stock t-stat to a lower opening temp and B. you have to reprogram the fan turn on/turn off temps to have any effect on the radiator fluid temp. In your case you could just reprogram the fan turn on/off temps a little bit to take a few extra * out of the radiator fluid but it wont be much due to the fact that the stock t-stat will close shut in an attemp to keep the radiator fluid to 210*""

[Andrew426]

I found this post some where - talking about another person's set up



"Your set up is taking trans fluid that is roughly 220* coming out of the trans,running it through the ext trans cooler and droping it to 190 or so then running it through the radiator cooler only to raise the trans fluid tep up to roughly 210* in which you effectively done squat at reducing the trans fluid tep.
As far as the trans fluid warming up the radiator fluid and making the motor run hotter and in turn loose power, not going to happen. Why you might ask well for one thing even if the radiator fluid was 20* cooler you might gain 5hp if that. It won't matter if you dump extra heat into the radiator fluid as the system is designed to handle that heat and disipate it to the air and your motor will still see a coolant tep of 210* reguardless as the fan tep settings as well as the thermostat work together at keeping a constant 210*. Here is a simple example for you to understand what im saying. If the outside air is 30* what is your motor tep when its warmed up--um 210*. Now what is the motor temp in the summer if the outside air is 90* yea you guessed it 210*. How could the radiator fluid still be 210* in the summer when your putting 60* hotter air through the radiator. It simply disipates it more due to the run time of the fans to keep the temp @210. So you see it won't matter if you have the trans fluid thats hotter,run through the radiator as the fans will still keep the radiator fluid @ 210. If you really want to cool the motor down you going to have to A. Replace the stock t-stat to a lower opening temp and B. you have to reprogram the fan turn on/turn off temps to have any effect on the radiator fluid temp. In your case you could just reprogram the fan turn on/off temps a little bit to take a few extra * out of the radiator fluid but it wont be much due to the fact that the stock t-stat will close shut in an attemp to keep the radiator fluid to 210*""

Thats not right... trans fluid is only good as a hydraulic fluid up to something like 139*c, and there is no way your coolant should ever be at 210*c.

[Alex R]

Thats not right... trans fluid is only good as a hydraulic fluid up to something like 139*c, and there is no way your coolant should ever be at 210*c.

When they are talking about 90 degree summer days i think its safe to say they are talking fahrenheit. 210 degrees F equals roughly 100 degrees Celcius.

My small town holds the Victorian record for hottest recorded day at almost 51 degrees celcius (thats what i heard anyway) and trust me, 51 celcius is plenty hot enough, would hate to see 90 :P

[ybl8te]

yes the temp must be in Fahrenheit - just found this comment and wonder if people could comment on if you put your trans thru the radiator first then air cooled or vice versa............starting to lean towards radiator first then air cooled.......people agree

secondly - does the trans fluid go in top first or bottom on the radiators........

the post i posted with temperatures in it was something i found and not from holden site - but it gives a good idea on how things might work......thats why i posted it and wanting someone to advise on correct way and connection.....

thanks

[wraith]

On mine it goes from transmission to bottom connector of the radiator then from the top to the external cooler then back to the transmission.

[immortality]

Agreed, that way when you are sitting in traffic (or doing skids, or whatever) and have no airflow over your external cooler, your trans fluid is still being cooled by the engine coolant..

The coolant temp is regulated by your thermostat, and your electric fans - so its still kept in check when sitting in traffic

you would thing so but unfortunately that is not he case.

your trans should run cooler then the engine coolant, see here trans life expectancy

standard V6 thermostat is 195 degrees F. i certainly wouldn't want my trans running that hot continuesly f i could avoid it.

with the standard Holden set-up including factory fitted external cooler my trans runs temps run at 150-180 degrees F when moving at any reasonable speeds it gets much hotter sitting stuck in traffic.

[ybl8te]

On mine it goes from transmission to bottom connector of the radiator then from the top to the external cooler then back to the transmission.

thanks dude ! - i take it too the external is the same as radiator i.e line in is bottom and line out is top also ????

[Andrew426]

you would thing so but unfortunately that is not he case.

your trans should run cooler then the engine coolant, see here trans life expectancy

standard V6 thermostat is 195 degrees F. i certainly wouldn't want my trans running that hot continuesly f i could avoid it.

with the standard Holden set-up including factory fitted external cooler my trans runs temps run at 150-180 degrees F when moving at any reasonable speeds it gets much hotter sitting stuck in traffic.

In traffic, though - you are going to be cooking your trans anyway with just an external cooler with no airflow over it. Best to keep it running through the radiator, which is temp controlled by thermo fans and a thermostat.

[wraith]

It shouldn't matter which one goes in where on the external cooler. It will run the same regardless.

[ybl8te]

well i have just made the change - trans - lower radiator - cooler - trans -

dont think we should notice a difference - only in the kms done after the tranny blows up eventually - have a great day

[immortality]

In traffic, though - you are going to be cooking your trans anyway with just an external cooler with no airflow over it. Best to keep it running through the radiator, which is temp controlled by thermo fans and a thermostat.

the only way that i have found to keep it cool in traffic is to have the climate/aircon on as this keeps the thermo fan running for much longer. this is with both the internal radiator cooler as well as the factory fitted external cooler as fitted by the Holden dealer

[Darcon666]

well i have just made the change - trans - lower radiator - cooler - trans -

Yep...exactly what I did for the wifeys car.

As for keeping it cool while stopped in traffic(I didn't have the room for the wifey's car to fit this, otherwise I would have...lol)

PWR Trans Oil Cooler:-