transmission Cooler - G50

[Flagship-Q]

Hi guys, I just installed a transmission cooler on my Q. I ended up mounting it behind the radiator at the bottom (close to behind the O.E. elec. pusher fan). I was wondering where everybody else that has done this is putting theirs. Is there is a substancial difference from mounting it in this location as opposed to installing it in front of the condensor/radiator (albight, would be very difficult to get to)? P.S. - Notice the external transmission filter (black canister) that Infiniti installed as part of the replacement of the transmission at 50K (this is where I tied the cooler into).

[Jesda]

Thats where I had mine installed. There's pics of folks who put it in the air dam of the bumper or something. Its safer attached to the radiator though.

[qship96]

it is getting a double heat treatment in that location! mounting it inbetween the condenser and radiator puts it BEFORE the heat load of the radiator!I would relocate it so it does not get the pre heated air!

[Jesda]

Its closer to the fan where it is.

[Flagship-Q]

it is getting a double heat treatment in that location! mounting it inbetween the condenser and radiator puts it BEFORE the heat load of the radiator!I would relocate it so it does not get the pre heated air!

So this is where yours is mounted? It would probably take removing the radiator to do it. I was kinda thinking that the air would be at the coolest at the bottom. Hmmmmm.

[elwesso]

i think the ideal location is on the bottom between the radiator and condensor...

[maxnix]

i think the ideal location is on the bottom between the radiator and condensor...

Of course, I think it should have its own unheated flow of cool air, like the active cooler.

[elwesso]

but it has no flow at low speeds which is where it needs it most.

[Flagship-Q]

but it has no flow at low speeds which is where it needs it most.

It will after I install my main electric fan. I'm thinking about having it on an A/C-Temp replay with a manual overide switch so that I can turn it on at low speeds if necessary. I agree though, I think I'm gonna just pull the radiator and mount it in front of it. Thanks all!

P.S. - I wonder if the O.E. elec. pusher fan could be programed in (by robert?) to come on at a lower temp to help out the transmission cooler? Just thinking.

[maxnix]

but it has no flow at low speeds which is where it needs it most.

Not unless it is holding in gear or going slowly up hill. More airflow than behind a raidator condenser with no fan acutuated! And more airflow when moving as there is no obstruction. Why the active cooler is located there.

[maxnix]

There is a B&M unit with a ducted fan like the active cooler, and if I did a lot of urban driving in even a moderately warmer climate with a lot of hills (think SF or SEattle in TX), I would do it.

I wonder if you could use and active ECU to read the temperature and trigger the fan? It must work that way if you can find a sensor with the appropriate output.

By the way, the ATF is not heating through slippage if the driver puts the transmission in N while stopped. And instead of absorbing heat from the surrounding radiator and/or condenser, it is surrounded by ambient temperature air when located where the active cooler would be!

There's a concept for you.

[Q45tech]

A good rule of thumb assumming the heat exchanger is properly sized area wise for the heat load is to assume a 20F fluid drop from the inlet air temperature.

If 200F ATF goes in and is cooled by 174F air the ATF will only drop to 194F.If 200F ATF goes in and is cooled by 140F air the ATF will drop to 180F.......the efficiency drops as the spread gets wider.

If 200F ATF goes in and is cooled by 100F air the ATF might drop to 160F.

Obviously air flow speed variations have lots of effect.

Always a good idea with any add on heat exchanger to MEASURE the effects.

[maxnix]

Always a good idea with any add on heat exchanger to MEASURE the effects.

With that in mind, seems the inlet and outlet of the ATF cooler would be perfect place to install the sensors.

Any idea on specific instrumentation? I plead ignorance.

[Flagship-Q]

That's pretty interesting. I have a active radiator/electric fan on the way. I wonder if that could be used for this purpose and wired up so it could be a completely independent unit?

[elwesso]

The only thing is that the trans doesnt need much cooling when its cruising at speeds.... At least thats how i understand it...

[DrewQ45]

i think the ideal location is on the bottom between the radiator and condensor...

Yeah,

That's where T-3 had mounted mine.



..Drew...

[maxnix]

The only thing is that the trans doesnt need much cooling when its cruising at speeds.... At least thats how i understand it...

Don't recall the LA to Vegas run frying Q45 transmissions?

Probably from before you joined the board.

[Jesda]

North Idaho, I-90. Not an automatic transmission's best friend. I felt the shifter stalk getting hotter.

[sijoko]

Has anyone hooked up a gauge to measure the trans fluid temps?

I have seen as high as 210 degrees in stop-and-go traffic in 95 deg. weather. But my converter stalls high at around 2600 rpm, so there is a lot more slippage than stock.

Once the car is moving, it drops back down to around 160.

I would like to know what temps you guys with stock or modified trannies are seeing in traffic.

[elwesso]

Where do you have your cooler, siju?

[DrewQ45]

I'm wondering if I should just splice in a filter on the line leading to the transmission cooler as shown here. What do you think?

[Q45tech]

Remember if the coolant is 180F and AC is on the air leaving the radiator is way over 160F.

In front of condenser ~~100-110F in traffic, after condenser 120-130-140F, after radiator 150-200F in traffic.

http://www.roscommonequipmentc...5.pdf

everything you need to know.

[Flagship-Q]

Remember if the coolant is 180F and AC is on the air leaving the radiator is way over 160F.

In front of condenser ~~100-110F in traffic, after condenser 120-130-140F, after radiator 150-200F in traffic.

http://www.roscommonequipmentc...5.pdf

everything you need to know.

Does anyone have a photo of theirs mounted IN FRONT of the condensor then? It looks like a challenge at the very least to mount it there although it is obviously the best mounting spot.

[redmanfx]

I've got mine mounted between the Condenser and the radiator.

red

[DrewQ45]

Does anyone have a photo of theirs mounted IN FRONT of the condensor then? It looks like a challenge at the very least to mount it there although it is obviously the best mounting spot.

That may be ideal for the warm months but Ii'd be wary of having it that way in the winter. Might cause the transmission to run too cool.

[superuber]

This may be a dumb question, but what if you eliminate the transmission lines going to the rad and just run an external cooler. Is this bad or normal procedure?

[irax]

Uhh thats what I think they are doing, if not I dont see the point i would put it infront of the fenderliners in the wheelwells so that the act of driving pull air thrugh..

This may be a dumb question, but what if you eliminate the transmission lines going to the rad and just run an external cooler. Is this bad or normal procedure?

[superuber]

What I meant was I have seen some people splice into the lines and hook up the cooler leaving the lines in the rad PLUS the cooler. Others eliminate the rad completely and just run a cooler.

[sijoko]

Where do you have your cooler, siju?

Wes, my transmission coolers have been moved to the back of the car to clear up some space. They work fine back there. I have the trans. temp gauge to keep on eye on things. - Siju

[Q45tech]

From 100k to present day I've just had the cooler in between rad and condenser.........205,000 miles in and around ATL up to NC........it does get a little funky when it gets down tp 10F but the transmission never froze.