2 stage cooling kit fitted today
Discussion
I bought it a year ago and finally got it fitted.
The usual place is near the swan neck and tie the control to the chassis. Having a turbo makes that area pretty tight so I came up with a different location.
The relays are held in place with a couple of short self tappers into the radiator cowling.
The control box is tied to the air intake. The temp sensors are both inside the top radiator hose.
I’ve run the wires up the inner wing and connected to the otter switch with the wires under the plenum.
So all very tidy.
Whilst I had the coolant out I’ve taken out the thermostat.
Arguments for and against I know.
But I think it’s not needed as the turbo gets these engines up to running temp pretty quick.
The usual place is near the swan neck and tie the control to the chassis. Having a turbo makes that area pretty tight so I came up with a different location.
The relays are held in place with a couple of short self tappers into the radiator cowling.
The control box is tied to the air intake. The temp sensors are both inside the top radiator hose.
I’ve run the wires up the inner wing and connected to the otter switch with the wires under the plenum.
So all very tidy.
Whilst I had the coolant out I’ve taken out the thermostat.
Arguments for and against I know.
But I think it’s not needed as the turbo gets these engines up to running temp pretty quick.
Penelope Stopit said:
I use something very simlar after getting sick of failing otter switches, been on years now and reliable.SILICONEKID 345HP 12.03 said:
Do we really need these stage two gizmos?
Can my Emerald do all this ?
I don't think I'm to bothered because mine has never over heated but I would be interested in a timed or thermostat overrun when the engine is turned off .
Here you go for the method, you need to shop around as there are some very cheap off timers on the marketCan my Emerald do all this ?
I don't think I'm to bothered because mine has never over heated but I would be interested in a timed or thermostat overrun when the engine is turned off .
https://www.ebay.co.uk/itm/TIMER-RELAY-Adjustable-...
Penelope Stopit said:
Here you go for the method, you need to shop around as there are some very cheap off timers on the market
https://www.ebay.co.uk/itm/TIMER-RELAY-Adjustable-...
Totally lost when it comes to car electrics ..https://www.ebay.co.uk/itm/TIMER-RELAY-Adjustable-...
SILICONEKID 345HP 12.03 said:
Do we really need these stage two gizmos?
Can my Emerald do all this ?
I don't think I'm to bothered because mine has never over heated but I would be interested in a timed or thermostat overrun when the engine is turned off .
Not really Daz, the key advantage is actually all about reducing the current spike you see when both fans chime in simultaneously, rather than any true cooling improvement the staged fan arrangement is meant to offer. My £45 Davies Craig fan controller achieves this current spike reduction simply by using an internal delay circuit, when the fans are triggered by the temp switch only fan one comes on, five seconds later the second fan chimes in, there's also delay fan off feature too.Can my Emerald do all this ?
I don't think I'm to bothered because mine has never over heated but I would be interested in a timed or thermostat overrun when the engine is turned off .
Standard automotive 40a relays are used Davies Craig fan controller rather than problematic delay relays, this makes relay replacement easy and cheap, the delay cicuit eliminates any current spike which can cause a dip in idle speed and bit like when you put power steering in full lock. This delay fan arrangement helps out even if the ECU has closed loop idle management ensuring you always maintain your precise target idle speed no matter what. My Canems system runs a combination of idle control using the Bosch air control valve and scatter spark idle, these both work together to maintain my target idle speedso the Davies Craig fan controller is really just the icing on the idle cake.
In terms of a cooling advantage running one fan a lot earlier than the second as with the Modwise kit is questionable at best, it's not like one fan can control the coolant temperature on it's own without it staying on permanently, a failure of one of my two fans a while back proved this a while back. The only thing this Modwise two stage fan arrangement would achieve is longer periods of fan one on time before fan two eventuality has to cuts in, well at idle at least which is when you really need rad fans after all.
Clearly there's no real world cooling advantage the Modwise two stage cooling fan kit, like I say the only advantage would be a reduction in the big amp spike you see when both fans come on at once, and the delay feature on the Davies Craig fan controller offers exactly this in a really neat cost effective and quality made package.
The final point I'd make is the standard cooling system in good health maintains optimal running engine temps perfectly well enough so all these two stage fan controllers, expensive aluminum radiators and even worse low temp thermostats offered to help overheating are all a load of bollix anyway. If people are suffering overheating problems they should start by making sure their coolant system is bled correctly and so free from air, their standard rad is in good order, and both their fans are running as the connectors are prone to corrosion.... poor earthing can also lead to slow running fans which will limit their effectiveness too.
rigga said:
Can't see the point of a fan running after engine shutdown, water pump won't be circulating coolant, so although you will be drawing hot air from the Rad, and might get a little cooling affect through the system, the engine itself will not see any benefit.
Flow remains by virtue of the principle of thermosyphon and is why for years rad fans on most cars continue to run after the engine has been switched off, if it didn't work car makers wouldn't wire the fans that way.Thermosyphon is how some early veteran liquid cooled cars got away without having a water pump at all, as hot water rises cool water falls, this cycle creates a flow known as Thermosyphon.
Thermosyphon is still used on those solar panel & integrated hot water tank systems you see on the roof of your holiday apartment in Greece, the thing that gives you one 3 minute tepid shower in the morning before the water runs completely cold
SILICONEKID 345HP 12.03 said:
Whats the simplest way to keep one of my fans on for either a fixed time or temperature ?
One of these wired to a relay that switches it when the ignition is in the off position, set the temperature to as low as you like, you can also use the same relay to trigger an electric water pump
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