850W Radiator Fan UPGRADE Finally Installed

N54_Fan · 08-24-2012, 07:58 PM

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JamesM3M5 · 08-24-2012, 08:27 PM

Nice more than extremely detailed writeup. I never imagined it would be a 70A circuit.

Zebra99 · 08-24-2012, 08:48 PM

Serious research and input for the community.

Thanks OP! Your work is commendable!

neilvosko · 08-24-2012, 09:03 PM

Mad props for the install. ER dual is a big help here in Florida but he heat is brutal.

Have you tried water wetter?

TurboBimmer · 08-25-2012, 06:42 AM

Great writeup!

I see how the fan will help to cool the car down between sessions at a trackday. However, I don't think it'll help with overheating issues during driving on the track.

But maybe I'm wrong and I look forward to your test results!

N54_Fan · 08-25-2012, 08:00 AM

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TurboBimmer · 08-25-2012, 09:32 AM

Last weekend, I've driven two 335i's on a trackday in hot summer heat (85°F):

- my own 6AT car equipped with ER Sports OC, AR Design OC in front of the radiator and PPK radiator.

- a 6MT car with upgraded OC.

Same tune, similar suspension mods, same day, same track.

I managed to overheat my car within two hard laps, water temps going above 240° and power completely cut by the ECU.

In the 6MT the car could be pushed no problem for a 30 minutes session.

So this made it clear for me that the real culprit is the heat exchanger in the radiator: the 3 lowest rows are used by the transmission oil which exchanges the heat with the engine coolant. This is fine when the engine is cold as it helps to get coolant temps up quicker, but on the track it becomes a handicap where the hot tranny oil simply overheats the coolant even more.

What we need is an external tranny cooler to keep both circuits separated.

N54_Fan · 08-25-2012, 10:58 AM

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enrita · 08-25-2012, 11:38 AM

Best would be in front of intercooler IMHO. Shouldnt be that difficult .

cvc 22349a · 08-25-2012, 12:17 PM

Quote:

Originally Posted by Autobahn335i

Last weekend, I've driven two 335i's on a trackday in hot summer heat (85°F):

- my own 6AT car equipped with ER Sports OC, AR Design OC in front of the radiator and PPK radiator.

- a 6MT car with upgraded OC.

Same tune, similar suspension mods, same day, same track.

I managed to overheat my car within two hard laps, water temps going above 240° and power completely cut by the ECU.

In the 6MT the car could be pushed no problem for a 30 minutes session.

So this made it clear for me that the real culprit is the heat exchanger in the radiator: the 3 lowest rows are used by the transmission oil which exchanges the heat with the engine coolant. This is fine when the engine is cold as it helps to get coolant temps up quicker, but on the track it becomes a handicap where the hot tranny oil simply overheats the coolant even more.

What we need is an external tranny cooler to keep both circuits separated.

Did PWR ever make an AT specific radiator?

TurboBimmer · 08-25-2012, 12:55 PM

Quote:

Originally Posted by cvc 22349a

Did PWR ever make an AT specific radiator?

I don't think so. Nobody jumped on the wagon due to the high price tag.

Gugs · 08-25-2012, 01:05 PM

Excellent work!

I need to do this also.
Wish there was a simple harness to just buy and slap on lol

N54_Fan · 08-25-2012, 01:10 PM

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N54_Fan · 08-25-2012, 01:17 PM

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TurboBimmer · 08-25-2012, 01:19 PM

Quote:

Originally Posted by N54_Fan

Agreed that an AT will have less heat exchange with the lower portion being taken up by tranny cooler. The problem is 1) you need to fabricate one 2) where to put it. My wheel wells are taken up by oil coolers 3) the lower portion of the radiator gets the least air flow!!

When I bought the car as AT I never intended on tracking. But now I am determined to make it track worthy at hopefully over 500 HP by the time I am done.

Hehe, that sounds familiar

Most mods on my car are with the track in mind.

1) Cooler cores are widely avaible. We need a custom bracket to fix it and stainless braided lines to connect to the tranny. And then some block-offs for the connections on the radiator which are no longer uses.

2) either in front of the radiator or of the intercooler or in the driver side wheelwell.

3) therefore installing it in the wheel well is a better option.

cvc 22349a · 08-25-2012, 01:28 PM

Quote:

Originally Posted by N54_Fan

No I called PWR USA rep in NC and they said no radiator for AT because of the difficulty with tranny cooler.

Nice write up btw.

N54_Fan · 08-25-2012, 02:11 PM

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NiVeDh · 08-25-2012, 03:23 PM

Good stuff! How fitting that your forum name is N54_Fan!

08-24-2012, 07:58 PM	#1
N54_Fan Lieutenant 34 Rep 502 Posts Drives: BMW Join Date: May 2008 Location: Parts unknown iTrader: (0)	850W Radiator Fan UPGRADE Finally Installed . Last edited by N54_Fan; 10-25-2012 at 08:07 PM..
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08-24-2012, 08:27 PM	#2
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	Nice more than extremely detailed writeup. I never imagined it would be a 70A circuit. __________________ RRT E92 335i/6MT with stuff and things
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08-24-2012, 08:48 PM	#3
Zebra99 Colonel 112 Rep 2,856 Posts Drives: 2011 335is E93 Join Date: Aug 2011 Location: Ontario iTrader: (6) Garage List 2008 BMW 335i E93 [10.00]	Serious research and input for the community. Thanks OP! Your work is commendable!
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08-24-2012, 09:03 PM	#4
neilvosko Lieutenant Colonel 89 Rep 1,529 Posts Drives: 335i e92 FBO Join Date: Dec 2011 Location: miami iTrader: (19)	Mad props for the install. ER dual is a big help here in Florida but he heat is brutal. Have you tried water wetter?
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08-25-2012, 06:42 AM	#5
TurboBimmer Lieutenant Colonel 79 Rep 1,617 Posts Drives: F82 M4 Join Date: Mar 2009 Location: Luxembourg iTrader: (5)	Great writeup! I see how the fan will help to cool the car down between sessions at a trackday. However, I don't think it'll help with overheating issues during driving on the track. But maybe I'm wrong and I look forward to your test results! __________________ Performance Seats, Exhaust, Splitters, Pedals, Steering Wheel / RB Turbos / M3 CF Roof / Brembo GT BBK 355/345 / Rollcage / Forge FMIC / Quaife LSD / Öhlins Road & Track / M3 Suspension Parts / Solid Subframe Bushings / Vorshlag Camberplates / Megan Racing Toe Links / LeatherZ Gauges / Extended M3 DCT Paddles / ER Sports OC / AR OC / Aux Radiator / AR DPs / Alpina TCU / COBB Pro-Tune
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08-25-2012, 08:00 AM	#6
N54_Fan Lieutenant 34 Rep 502 Posts Drives: BMW Join Date: May 2008 Location: Parts unknown iTrader: (0)	. Last edited by N54_Fan; 10-25-2012 at 08:07 PM..
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08-25-2012, 09:32 AM	#7
TurboBimmer Lieutenant Colonel 79 Rep 1,617 Posts Drives: F82 M4 Join Date: Mar 2009 Location: Luxembourg iTrader: (5)	Last weekend, I've driven two 335i's on a trackday in hot summer heat (85°F): - my own 6AT car equipped with ER Sports OC, AR Design OC in front of the radiator and PPK radiator. - a 6MT car with upgraded OC. Same tune, similar suspension mods, same day, same track. I managed to overheat my car within two hard laps, water temps going above 240° and power completely cut by the ECU. In the 6MT the car could be pushed no problem for a 30 minutes session. So this made it clear for me that the real culprit is the heat exchanger in the radiator: the 3 lowest rows are used by the transmission oil which exchanges the heat with the engine coolant. This is fine when the engine is cold as it helps to get coolant temps up quicker, but on the track it becomes a handicap where the hot tranny oil simply overheats the coolant even more. What we need is an external tranny cooler to keep both circuits separated. __________________ Performance Seats, Exhaust, Splitters, Pedals, Steering Wheel / RB Turbos / M3 CF Roof / Brembo GT BBK 355/345 / Rollcage / Forge FMIC / Quaife LSD / Öhlins Road & Track / M3 Suspension Parts / Solid Subframe Bushings / Vorshlag Camberplates / Megan Racing Toe Links / LeatherZ Gauges / Extended M3 DCT Paddles / ER Sports OC / AR OC / Aux Radiator / AR DPs / Alpina TCU / COBB Pro-Tune
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08-25-2012, 10:58 AM	#8
N54_Fan Lieutenant 34 Rep 502 Posts Drives: BMW Join Date: May 2008 Location: Parts unknown iTrader: (0)	. Last edited by N54_Fan; 10-25-2012 at 08:08 PM..
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08-25-2012, 11:38 AM	#9
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Best would be in front of intercooler IMHO. Shouldnt be that difficult . __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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08-25-2012, 01:05 PM	#12
Gugs Banned 28 Rep 457 Posts Drives: E92 JetBlack Join Date: Jul 2012 Location: Long island iTrader: (1)	Excellent work! I need to do this also. Wish there was a simple harness to just buy and slap on lol
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08-25-2012, 01:10 PM	#13
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08-25-2012, 01:17 PM	#14
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08-25-2012, 02:11 PM	#17
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08-25-2012, 03:23 PM	#18
NiVeDh Major General 422 Rep 8,003 Posts Drives: '08 E90 335i, '99 E36 M3 Join Date: Apr 2009 Location: Houston, TX & Atlanta, GA iTrader: (132) Garage List 2008 BMW 335i Sedan [8.66]	Good stuff! How fitting that your forum name is N54_Fan!
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