oil cooler problem？

[Bullitt]

^ Nice setup, but his mini oil cooler blocks cool air to the radiator. It appears the N54 incurs limp mode from high water/coolant temps once oil temp reaches above 260-270 so it's in the best interest to favor water cooling over oil cooling, at least slightly.

Upgrading the radiator fan is only helpful if your car tends to get stuck in slow traffic. In track situations where the car is moving at speed, there is no benefit as the radiator has plenty of air running through it.

This radiator is currently being sold for under $600.

[HP Autosport]

Originally Posted by Bullitt

There's finally a direct-fit aluminum radiator by Mishimoto available (for 6MT only)! It hasn't been out for more than a couple months, but has anyone tried it? From all the feedback on these forums, it appears improving water cooling is more effective than oil cooling for preventing limp mode on the track. I've been considering adding just the auxiliary radiator from the PPK2 but this could be the way to go. Or both!

http://www.e90post.com/forums/showthread.php?t=950469
http://www.e90post.com/forums/showthread.php?t=999461

This has been discussed in another thread. Our time attack 335i only had a radiator upgrade and never experienced overheating. While other competitors with 135i's were running larger or even two oil coolers continued to have issues.

Coolant is the primary cooling agent so as long as you keep the coolant temps in check you won't have to tax your oil cooling system much.

The price is about right. That was one reason we never came to market with our design. Ours had increased capacity and required some cutting and trimming to fit, but it worked wonders! The same radiator is being used by Scott Cary's BMWCCA Club Racer lap after lap without issues.

[Nugget]

Why not ask if the Mishimoto one in the post above yours will fit a 1M.

[schnite]

pwr radiator who want tell me ？

[schnite]

what s ppk2？

[HP Autosport]

Originally Posted by Ian///M

Wish the was a coolant radiator upgrade for N54

How bad is the coolant temp. issue you are having with your 1M?

[MDORPHN]

Originally Posted by Ian///M

128 deg oil, 112 water on track running PTF custom tune. Seems manageable?

128 C oil (262 F) is fine.

Neil

[HP Autosport]

Originally Posted by Ian///M

128 deg oil, 112 water on track running PTF custom tune. Seems manageable?

128C on oil temp? You are fine my friend!

[wjk_glynn]

Originally Posted by Ian///M

128 deg oil, 112 water on track running PTF custom tune. Seems manageable?

Coolant is getting close to, but not exceeding thermal trip wires.

The upper thresholds/maximums are documented in: http://www.1addicts.com/goodiesforyou/n54-2.pdf

It lists...

Oil Temperature (page 49)

• Up to 149C/300F - normal operation
• 150C/302F to 157C/315F - component protection mode
• 158C/316F and up - emergency mode

Coolant Temperature (page 50)

• Up to 116C/241F - normal operation
• 117C/243F to 124C/255F - component protection
• 125C/257F and up - emergency

Now besides the upper thresholds/maximums listed above, the Engine Management System also has coolant temperature targets depending on the mode (see page 47 of the same document). They are:

• 108C/226F - ECO mode
• 104C/219F - Normal mode
• 95C/203F - High mode
• 90C/194F - High + map-thermostat mode

The document goes on to explain...

The control system aims to set a higher cylinder-head temperature (108°C) if the engine control unit determines ECO (economy) mode based on the engine performance. The engine is operated with relatively low fuel consumption in this temperature range as the internal friction is reduced.

An increase in temperature therefore favors slower fuel consumption in the low load range. In HIGH and map-thermostat mode, the driver wishes to utilize the optimum power development of the engine. The cylinder-head temperature is reduced to 90°C for this purpose. This results in improved volumetric efficiency, thus increasing the engine torque. The engine control unit can now set a certain temperature mode adapted to the respective operating situation. Consequently, it is possible to influence fuel consumption and power output by means of the cooling system.

The temperatures specified only ever represent a target value, the attainment of which is dependent on many factors. These temperatures are first and foremost not attained precisely.

The consumption-reducing and power increasing effects arise in each case in a temperature spectrum. The function of the cooling system is to provide the optimal cooling output according to the boundary conditions under which the engine is being operated.

Karl.