Aftermarket fans. Slim and good.

[Behold81]

Full of questions today!!!

It would be good if they can do two speed to keep stock function but not required. Would you go two small, one large or a large and small???

I could do with some space between my charger pulley and fans as it's basically a few mil!!!

Any thoughts would be great.

[gsd2000]

I would like to know the same thing

[S800VXR]

Me too as I'd like one for the upcoming oil cooler.

[stevieturbo]

How does the OEM actually achieve two speeds though ?

Is there some sort of control module in the fan itself, or is it external ?


Either way, keep it simple. Good quality Spal fans, job done.

[Behold81]

The ecu controls the fans. There is a high and low circuit customisable in the ecu. but I think the fans have a two speed controller in them. You would need it.

Just a way to trigger it.

[Yanayaya]

I know this isn't a perfect comparison but please read. I installed a slimline fan into my Cavalier Turbo before I went on the Modball Rally, the original unit for the car is large, quite heavy and makes a lot of noise. Despite me installing my new fancy whoopdy-doo slim line fan I took the old one with me just in case. By the time I got to Barcelona the fan was NEVER off, it couldn't cool the engine and the temperature was always dangerously high, this was a full size slime line fan as well!
That night in the underground car park I had to rip it out and out the OEM one back in which made a much better job of it.

From that point on I decided I'd never use one again.

[stevieturbo]

Yanayaya said:

I know this isn't a perfect comparison but please read. I installed a slimline fan into my Cavalier Turbo before I went on the Modball Rally, the original unit for the car is large, quite heavy and makes a lot of noise. Despite me installing my new fancy whoopdy-doo slim line fan I took the old one with me just in case. By the time I got to Barcelona the fan was NEVER off, it couldn't cool the engine and the temperature was always dangerously high, this was a full size slime line fan as well!
That night in the underground car park I had to rip it out and out the OEM one back in which made a much better job of it.

From that point on I decided I'd never use one again.

There are many makes, designs, models of fans, both slim and not so slim.

So you cant make a generic statement that a slim bad doesnt work.

They can work, they do work, but you need to use a suitable item, and install it correctly.

That said, OEM fans will always be very powerful, and they're always installed in a cowl to move air efficiently through large sections of the radiator core. So they are almost always very good setups

By installing a slim fan directly to the core, you've already made it less efficient. By using a fan maybe less powerful, you've made it less efficient...and that's assuming you chose correct direction of airflow, and wired it correctly.

There are a few variables that can go wrong.

But buy a good powerful Spal fan, as big as you can fit on the core and it should work very well. They do basic models and high powered models as well as different blade profiles, as well as the usual push/pull options

[Yanayaya]

stevieturbo said:

There are many makes, designs, models of fans, both slim and not so slim.

So you cant make a generic statement that a slim bad doesnt work.

They can work, they do work, but you need to use a suitable item, and install it correctly.

That said, OEM fans will always be very powerful, and they're always installed in a cowl to move air efficiently through large sections of the radiator core. So they are almost always very good setups

By installing a slim fan directly to the core, you've already made it less efficient. By using a fan maybe less powerful, you've made it less efficient...and that's assuming you chose correct direction of airflow, and wired it correctly.

There are a few variables that can go wrong.

But buy a good powerful Spal fan, as big as you can fit on the core and it should work very well. They do basic models and high powered models as well as different blade profiles, as well as the usual push/pull options

I never made the statement that they don't work. I made the statement that it didn't for me.

[Behold81]

I would be tempted to make a cowl or mount it to my existing cowl for good airflow. My issue is the motor head sticks out too far and is about 3mm from my crank pulley. It's never hit but putting a belt on and off is a killer.

[Behold81]

I would be tempted to make a cowl or mount it to my existing cowl for good airflow. My issue is the motor head sticks out too far and is about 3mm from my crank pulley. It's never hit but putting a belt on and off is a killer.

[paul450]

This fan would fit your needs mate.

Its slim has a very good flow rate, twin speed or you could have it on fast all the time
and has a high current draw.

if it is too big a diameter, its 17" you can get a 14" one aswell.

http://www.demon-tweeks.co.uk/Product.do?method=vi...

[paul450]

This fan would fit your needs mate.

Its slim has a very good flow rate, twin speed or you could have it on fast all the time
and has a high current draw.

if it is too big a diameter, its 17" you can get a 14" one aswell.

http://www.demon-tweeks.co.uk/Product.do?method=vi...

[stevieturbo]

Spal make some of the thinnest and best fans out there.

I'm sure if you google you'll find various suppliers.

http://www.ebay.co.uk/itm/100-Authentic-SPAL-30102...

They do an "extreme" range also with much more powerful motors for more airflow. They will be slightly bulkier than the normal range
Price seems high here although it is an international seller.

http://www.ebay.co.uk/itm/SPAL-16-EXTREME-ELECTRIC...

Straight fans will usually flow more air, but the curved blades tend to be quieter so most prefer them. Dont think it's a huge difference in airflow either way

But you want as much core coverage as possible as well as airflow.

[Behold81]

stevieturbo said:

Spal make some of the thinnest and best fans out there.

I'm sure if you google you'll find various suppliers.

http://www.ebay.co.uk/itm/100-Authentic-SPAL-30102...

They do an "extreme" range also with much more powerful motors for more airflow. They will be slightly bulkier than the normal range
Price seems high here although it is an international seller.

http://www.ebay.co.uk/itm/SPAL-16-EXTREME-ELECTRIC...

Straight fans will usually flow more air, but the curved blades tend to be quieter so most prefer them. Dont think it's a huge difference in airflow either way

But you want as much core coverage as possible as well as airflow.

So option 1 is 2 10inch and mount them to my old cowl cut down to fit. this will make it no deeper than the spal fans themselves. or 1 big 14 inch no cowl

Thoughts?

[stevieturbo]

Go for whichever offers most core coverage and pulls the most airflow.

2x smaller fans dont always cover more surface area or flow more air.

Do the maths.