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330i Cooling refresh and radiator choices

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I'm planning to refresh my cooling system to make sure it's in top condition prior to some engine upgrades.  I've already sourced a replacement water pump and thermostat.  I think it's probably also prudent to replace the radiator and expansion tank which are of unknown age and condition.  They may well be the originals as fitted in 2000 and nearing 100k miles plus plenty of track time too!

Trying to figure out whether it's worth going for the all aluminium type rads or just sticking with OEM Hella or something like Nissens with a good reputation?  I'd love the best cooling possible for the planned engine mods but would value any experience you may have of improving your cooling using such rads.

Rad choices are

1. - OEM style replacement as per existing with plastic sides, either Hella or Nissens for approx £65

2. Ebay sourced all aluminium with various sizes available from 40-56mm core  but not exactly clear what will fit easily without some modifications approx £150

3. Mishimoto all aluminium rad backed by lifetime guarantee which does add some extra cooling capacity and should fit standard car without mods but comes at price - £300

Clearly an all Al rad might  be removing a weak point in the system and giving a larger cooling surface area to remove heat they may not be made equal?  Also true that you'll only remove heat as far as allowed by the airflow over the rad and suitable low pressure areas to remove heat from under bonnet so just chucking a bigger rad in might be pointless!?  (might add bonnet venting to help with this).

Any experiences / recommendations ?

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The OE rads as in the car from new were Hella. The Expansion Tanks were made by them too. All available from Eurocarparts. 

If you've been happy with that on track until now, why upgrade. Unless you're adding forced induction,  why will you need better cooling? 

There's other options,  such as Evans waterless coolant, which promise to reduce temperatures. 

Kirkynut 

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12 hours ago, kirkynut said:

The OE rads as in the car from new were Hella. The Expansion Tanks were made by them too. All available from Eurocarparts. 

If you've been happy with that on track until now, why upgrade. Unless you're adding forced induction,  why will you need better cooling? 

There's other options,  such as Evans waterless coolant, which promise to reduce temperatures. 

Kirkynut 

This 👍

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On 16/07/2019 at 00:17, kirkynut said:

Unless you're adding forced induction,  ...

 You hit the nail on the head.... supercharger kit waiting to be installed, just need some time.

In the end I decided to stick with OEM and replace the existing rad and expansion tanks to be on the safe side.  The plan is to monitor the oil / coolant temps very closely following conversion to see what needs to happen for reliable track work without debilitating heat soak or killing the engine...

Pre conversion dyno very encouraging, car has retained nearly all it's power, AFR and power delivery very smooth.... will post more when there's progress. 👍

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