Auto Transmission Cooler (n54) upgraded turbos

[Sticky]

Well, can't post link since my rep is too low

Not too low anymore.

[135pats]

I disagree, liquid-to-liquid cooling/heating is vastly more effective than liquid-to-air cooling, simply due to the heat capacity and thermal conductivity of the liquid vs air. But again, neither of us have much hard data to argue about.

With all the trouble of routing the additional lines, and possible pressure drop issue on a highly complex hydraulic actuated unit, the risk is not worth messing with the stock setup.

Btw, how can we log the transmission fluid temperature? It might be possible that I can arrange a comparison of trans fluid temp between my CSF + 335is aux radiator and a local member with another AT car with similar power level but running with the stock cooling system, both cars can be on the same track at the same time.

Agree that you need solid data before adding a cooler. I am pretty sure INPA lets you monitor trans fluid temps real time.

I think this is the issue as much as $ or logistical considerations. There isn't a soul on earth who appears to have actually done the "math", so to speak. I don't have a clue what the optimal AT fluid temperature is supposed to be, I just know the temperature at which Redline D4 starts to get unhappy.

So some brave person is going to need to look into line pressure at idle, line pressure under load, temperature at idle, temperature under load, temperature delta, etc etc. For all we know the fluid and pan dissipate heat just fine, and the issue is clamp pressure alone (totally speculative but you see the point).

[cloud9blue]

Not too low anymore.

Appreciated, happy to bury the hatchet for the sake of sharing some more information.

For those who are not aware, you can read about CSF radiator in these two links
http://www.e90post.com/forums/showthread.php?t=1089057
http://www.e90post.com/forums/showthread.php?t=1121751

I agree with 135pats, stock trans cooling system is adequate for aggressive street use and drag racings (less so on road course, but that's another topic). The issue we have at the AT appears to be the clamping force vs. line pressure from the mechatronic unit/valve body. An additional oil cooler isn't going to solve any problem here.

But back on the topic, I would be happy to figure out some way to gather some data on the trans temp. However, INPA or any OBD solution wouldn't work in my case, at least for live data collection on the track, since I run on jb4 + backend flash. I might be able to get some data point by putting the jb4 in passive mode while in the pit.

[Sticky]

Appreciated, happy to bury the hatchet for the sake of sharing some more information.

Don't even remember the hatchet.

[ajsalida]

I think this is the issue as much as $ or logistical considerations. There isn't a soul on earth who appears to have actually done the "math", so to speak. I don't have a clue what the optimal AT fluid temperature is supposed to be, I just know the temperature at which Redline D4 starts to get unhappy.

So some brave person is going to need to look into line pressure at idle, line pressure under load, temperature at idle, temperature under load, temperature delta, etc etc. For all we know the fluid and pan dissipate heat just fine, and the issue is clamp pressure alone (totally speculative but you see the point).

Exactly right, and I would add it is really not necessary to do anything but log temp first under various conditions to see if in fact there is a temp problem. Then if that is shown to be the case, look into the rest of it.

[spxxx]

Who here has gone into limp mode due to ATF temp?
And coolant temp?

Post your mods, coolant type used, etc.

[bigdnno98]

Just spend $180 on a regular oil temp gauge and mount it in the cabin. Go pros can be used to record the gauge if necessary but usually it isn't as trans Temps don't fluctuate very quickly and can be glanced at by the driver

[bigdnno98]

I would think that trans Temps from trans to trans should be similar if using the same fluids? All DSM AT guys run trans coolers and see Temps around 140-160 normally and max at 200 when it's real hot after pulls. Anyone with an AT N54 have a trans temp gauge installed?

[4doorbmwpower]

Not much, it's a mishimoto universal trans cooler, comes fitted for Dash 8 lines, the shop cut and welded on black SS Dash 10 fittings and used black SS Dash 10 lines to hook it up, should add pretty significant cooling between the cooler, its placement, and the added trans oil capacity. Also doing stiffer transmission mounts and alpina flash

I'm debating on sending a plastic trans oil pan to my buddy that owns a machine shop and see if he can machine me a billet one, not sure which metal to use though....

lol. I have been working on one for a while. All the gremlins that come out with trying to engineer it have slowed my process. Then I started rebuilding the car so it is on the back burner. If you want to hold off I promise I am farther along in the Billet tranny pan than you will be if you start now lol. I only keep it secret because it will likely be a very high demand product when done and the ammount of R&D to ensure the oil still gets sucked up (because of how this tranny works) is very difficult. and you need to invent a new filter option. i am open to thoughts but having rapid prototyped some things before and the 3d sketches i have already done I feel this tranny pan I will be releasing will solve more problems than people think.

[Ericbh77]

[seroga1986]

Any updates on this? Worth installing a trans cooler? And if so, with heat exchanger or not? Maybe a thermoatat?

[Ericbh77]

IF YOU CAN RETAIN YOUR HEAT EXCHANGER KEEP IT, OTHERWISE YOU WILL NEED A THERMOSTAT. 165 DEG FOR TRANY.

[Sticky]

IF YOU CAN RETAIN YOUR HEAT EXCHANGER KEEP IT, OTHERWISE YOU WILL NEED A THERMOSTAT. 165 DEG FOR TRANY.

[Ericbh77]

Sorry, caps lock was on and didn't notice.

[matreyia]

"... I don't have a clue what the optimal AT fluid temperature is supposed to be..."



According to Jason at Propulsive Dynamics, his ATF temperature nominal should be around 165ºF.

VT

[N54 TURBO]

Would like to know if installing a trans cooler[example like a bms auto trans cooler] would affect line pressure and what if any issues when removing the stock heat exchanger has on the coolant/trans from that point on?I for one would love to get rid of that stock heat exchanger but not if it comes at a costly price.

[Payam@BMS]

Would like to know if installing a trans cooler[example like a bms auto trans cooler] would affect line pressure and what if any issues when removing the stock heat exchanger has on the coolant/trans from that point on?I for one would love to get rid of that stock heat exchanger but not if it comes at a costly price.

No issues at all, you're taking a restriction out. We've had it on our test car for over 2 years now, others have had custom setups for a while now. It's a proven solution that works.

https://burgertuning.com/products/bm...f6a8e45a&_ss=r