Replacing The Radiator Fan With Electric Fans. Performance Benifit?

[kitto]

My only concern its that my fans will turn off when the Haltech turns off.

They will. If you want them to run after engine shut down. You'll need a Timer kit to keep them on once a falling voltage from the ignition is detected (ie ignition off).

[R32 TT]

I don't see the point in this set up. Why not leave it just temp related. If you have enough airflow it will be cool enough and the fans wont come on anyway. How about if your tailing a car above 60 and getting no airflow....it will just overheat

The idea is that once above 60km/hr (or 70, or 80 - you choose), you already have more air flow than the fans can supply. Admittedly yes, the fan will create a low pressure side, but really it isn't necessary in my experience at least.

"If you have enough airflow it will be cool enough and the fans wont come on anyway." Not really true in practice. If you are belting it around the circuit, constantly turning 5000-7500rpm it can sit happily at 90 degrees even if the fan IS on. Having it on is not really helping, just pointlessly drawing 30 amps and putting extra load on the alternator.

Admittedly my car is less street, more track oriented.

I have not really noticed any dramas in traffic or following other cars at 60km/hr - but then I don't follow so close for it to be a problem.

Personally I think if you are going to have a fan running at full bore while doing 100km/hr then I think that setup is pointless - stick with the viscous.

But each to their own.

[R32 TT]

My only concern its that my fans will turn off when the Haltech turns off.

Doesn't matter a lot. Your water pump also happens to stop pumping when the Haltech Turns off... A little convection happens, but not a real advantage to cool the radiator when the water isn't being pumped around.

[N1GTR]

Does anyone have an actual figure for the stock clutch fan in CFM to give a fair comparison ?

[CrimsonLey]

Doesn't matter a lot. Your water pump also happens to stop pumping when the Haltech Turns off... A little convection happens, but not a real advantage to cool the radiator when the water isn't being pumped around.

I have a timer installed so I'll just set the time appropriately. Water still flows through the engine even though the water pump if off, right?

The idea is that once above 60km/hr (or 70, or 80 - you choose), you already have more air flow than the fans can supply. Admittedly yes, the fan will create a low pressure side, but really it isn't necessary in my experience at least.

"If you have enough airflow it will be cool enough and the fans wont come on anyway." Not really true in practice. If you are belting it around the circuit, constantly turning 5000-7500rpm it can sit happily at 90 degrees even if the fan IS on. Having it on is not really helping, just pointlessly drawing 30 amps and putting extra load on the alternator.

Admittedly my car is less street, more track oriented.

I have not really noticed any dramas in traffic or following other cars at 60km/hr - but then I don't follow so close for it to be a problem.

Personally I think if you are going to have a fan running at full bore while doing 100km/hr then I think that setup is pointless - stick with the viscous.

But each to their own.

Wouldn't the constant off and on at the track be bad? The car isn't consistently running above 60, right?

Im setting my car up for track usage as well but I at least want my puller fan to be running if my engine is hot.

[R32 TT]

I have a timer installed so I'll just set the time appropriately. Water still flows through the engine even though the water pump if off, right?

Well I don't think there is much advantage with the pump not running. Different if you have an electric water pump.. But I could be wrong and perhaps there is a lot more convection that I think, someone more knowlegable on that might be able to chime in.

Wouldn't the constant off and on at the track be bad? The car isn't consistently running above 60, right?

Im setting my car up for track usage as well but I at least want my puller fan to be running if my engine is hot.

Nope and that's why I have them go off when I get above 60km/hr.. but they don't come on until I am going under 40km/hr.. they are not going on/off/on at 59-61km/hr...

Plus stop and think about it. You are on the track (or anywhere for that matter) and come to a slow hairpin bend. You've just come off a straight and your temp is 85 degrees. For the 3 - 5 seconds you are in the hairpin at 45 km/hr and no fan, do you think your temp is going to race to 100 degrees? Not likely is it...

I run my car with the setup I mentioned in my first post - I wasn't giving you theory - and it works fine for me. But setups are different

The easiest thing for you to do is simply try it. Its only a software/programming change in the ECU, we're not talking about the choice between two different turbos. Give it a go and see what works.

[Bond]

In case anyone is interested my r33 was having overheating troubles and i thought it was my hub so i filled it up with silicon oil (bought from toyota) which makes it come on a bit earlier and keeps it on higher in the rev range. While my car was on the dyno trying to find out why it was 25kw down on power the operator suggested it may be my hub that sounds like its always on. Swapped it over to a non modified one and it made a whole 2rwkw extra! I'm happy to have the extra airflow minus 2kw!!

[CrimsonLey]

Nope and that's why I have them go off when I get above 60km/hr.. but they don't come on until I am going under 40km/hr.. they are not going on/off/on at 59-61km/hr...

Plus stop and think about it. You are on the track (or anywhere for that matter) and come to a slow hairpin bend. You've just come off a straight and your temp is 85 degrees. For the 3 - 5 seconds you are in the hairpin at 45 km/hr and no fan, do you think your temp is going to race to 100 degrees? Not likely is it...

I run my car with the setup I mentioned in my first post - I wasn't giving you theory - and it works fine for me. But setups are different

The easiest thing for you to do is simply try it. Its only a software/programming change in the ECU, we're not talking about the choice between two different turbos. Give it a go and see what works.

If you're going around a hairpin is the car really getting the air it needs while the are fans off? I'm glad it works for you but I'll probably have them completely controlled via temp and Haltech. I may try your setup at one point or another, thanks.

[sultanaz]

Sorry 2 dig up a older thread but i wanted to keep ontopic.

Seems abit 50/50 reading on the goods and bads of both parties reading through the pages.

Ive been thinking to upgrade my radiator to something new on my 94 R32 GTR. Probably a KOYO one, been thinking about the fans that cool it... i was wondering if anyone has used these(this brand/the product). http://www.ebay.com.au/itm/MISHIMOTO-ALUMINUM-FAN-SHROUD-R32-RB26-SKYLINE-GTR-/270468939728?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ef9347fd0

my radiator is fine right now and so is my standard fan but the car is 18 yrs old and been thinking about just having new gear on the car before i go the occasional trackday / powercruise.

Any suggestions to help me out abit more greatly appreciated.. thanks heaps.

[JustinP]

I have the same fans / shroud, although my car is still not put together. I will be using them with a new alloy radiator and an electric water pump (I have welded a plate onto the standard water pump, removing all the guts of it). I will also use a digital controller that will monitor temps and adjust the water pump speed and fan speed to reach the target temp. It also can be set to run for a couple minutes after the car is turned off.

Hopefully it will all work well! Quality on the fans / shroud seems pretty good.

Sorry 2 dig up a older thread but i wanted to keep ontopic.

Seems abit 50/50 reading on the goods and bads of both parties reading through the pages.

Ive been thinking to upgrade my radiator to something new on my 94 R32 GTR. Probably a KOYO one, been thinking about the fans that cool it... i was wondering if anyone has used these(this brand/the product). http://www.ebay.com.au/itm/MISHIMOTO-ALUMINUM-FAN-SHROUD-R32-RB26-SKYLINE-GTR-/270468939728?pt=Motors_Car_Truck_Parts_Accessories&hash=item3ef9347fd0

my radiator is fine right now and so is my standard fan but the car is 18 yrs old and been thinking about just having new gear on the car before i go the occasional trackday / powercruise.

Any suggestions to help me out abit more greatly appreciated.. thanks heaps.