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Chargecooler flow rate

Just checked, most likely VR6 Golf aux pumps. Possibly not Bosch, but Chinesium.
Thanks.

Ill find the specs of them. I have multiple units lined up for faster flow , but without monitoring the water temp pre / post cooler its hard to work out if I am maximising my gains.
 
The Megane 225 runs a similar pump, which is a newer version of the ones the 21's used for the same thing. They're quite powerful, great flow.
I have a fair few options here as per post Chargecooler flow rate

Its hard work finding out actual science as the chargecooler isnt stretched at all on the road. Its only on circuit and after 20min + that I see IATs creep.
 
I have a fair few options here as per post Chargecooler flow rate

Its hard work finding out actual science as the chargecooler isnt stretched at all on the road. Its only on circuit and after 20min + that I see IATs creep.
Id say thats more about the CC rad than the pump. Can you increase the rad size? Motorbike radiators are a good place to look, plentiful and cheap.
 
i used a fiat 500 rad last time i ran a CC setup, also used a barrel style cooler, temps were pretty awesome all day long, way over kill for what i was running through it.
 
The rad on the pro alloy is a decent size tbf Elise / Exige S2 Charge Cooler Pre Rad

Swapping current pump for same Bosch pipe size & plug but the slightly bigger bodied/spec one your easiest changes. As said before if not done at fitting sealing the gap between pre rad and radiator to force all air through helps, throw some water wetter in and get back out on track.

You could depending on side the water pipes are routed and what is in the rear side intake put an inline small rad to bolster the front pre rad. I used to run an oil cooler there which worked ok with minimal ducting
 
I have a fair few options here as per post Chargecooler flow rate

Its hard work finding out actual science as the chargecooler isnt stretched at all on the road. Its only on circuit and after 20min + that I see IATs creep.

To find out what your heat rejection is you'll need an actual flow rate, and temperatures either side of the CAC. You'll also need density and specific heat capacity but if you're using plain water then that can be estimated. You'd also be good to look at coolant temperature either side of the radiator.

If you have a decent size rad up front (e.g. same size as the engine radiator) then you'll likely need to up your coolant flow through the CAC (so bigger pump and bigger pipework / larger radius bends if you can). If you have a teeny radiator then I would probably start there as flowing more coolant won't help if you can't reject the heat to the air.

On the older 4.4 BMWs, the X5 / X6 had an additional radiator compared to the 550 to help with cooling for additional power - especially in hotter climates.
 
Id say thats more about the CC rad than the pump. Can you increase the rad size? Motorbike radiators are a good place to look, plentiful and cheap.
I am not sure I need to. My IAT are in check.

My point was that its easier to increase the flow rate rather than the rad. Is my CC pump undersized is the gist of the question
 
If you have a decent size rad up front (e.g. same size as the engine radiator) then you'll likely need to up your coolant flow through the CAC (so bigger pump and bigger pipework / larger radius bends if you can).
The CC rad is large. its the same width and length as the rad.

lotus_charge_cooler_pre_rad_1200x.webp

It sits directly on top of the rad.

I suspect you are right to suggest a larger pump. I might go up in the Bosch range and see whats what. I don't feel the need for a Davies Craig pump yet thats capable of putting out a fire from 2km away!
 
Yep and almost certainly not going to reproduce issue on the road, if changing pump maybe give it a flush and fresh additives after for good measure.

Wrong time of year also but next level up Bosch not going to have any negative impact and hopefully give you a bit more time before water gets hot
 
The CC rad is large. its the same width and length as the rad.

View attachment 215515

It sits directly on top of the rad.

I suspect you are right to suggest a larger pump. I might go up in the Bosch range and see whats what. I don't feel the need for a Davies Craig pump yet thats capable of putting out a fire from 2km away!
In which case that's not your problem.

Definitely go up a pump flow size.
 
Yep and almost certainly not going to reproduce issue on the road, if changing pump maybe give it a flush and fresh additives after for good measure.

Wrong time of year also but next level up Bosch not going to have any negative impact and hopefully give you a bit more time before water gets hot

Even on the hottest days I cannot reproduce it on the road.

I would be going from

Pressure [bar]:0,1
Flow rate [l/h]:900 ( 15l/min )

to

Pressure [bar]:0,3
Flow rate [l/h]:1300 ( 21.6l/min )
 
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