how the hell can't you use the stock clutch fan, that makes no sense at all?



is there really a difference in the size of an s4 and s5 rad???

[quote name='rowtareh' date='Aug 24 2005, 01:52 PM']how the hell can't you use the stock clutch fan, that makes no sense at all?



is there really a difference in the size of an s4 and s5 rad???


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there are some differences between the s4 and s5 rad. I have an s5 koy rad in my s4 also. I cant see the stock fan fitting with it. I have an e-fan hooked up to a switch.

I wonder if the benefits of the radiator will be offset by the inability to use the stock fan

[quote name='Rob x-7' date='Aug 24 2005, 09:41 PM']I wonder if the benefits of the radiator will be offset by the inability to use the stock fan


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curious to know too. it just seems kind of silly that they were not the same size radiators. is it thicker, wider, longer? what is it????

[quote name='rowtareh' date='Aug 24 2005, 06:00 PM']curious to know too. it just seems kind of silly that they were not the same size radiators. is it thicker, wider, longer? what is it????


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its thicker than the stock radiator... https://www.nopistons.com/forums/pub...#>/biggrin.png its sits farher back than the stock unit

I used a taurus E-fan on my old setup with the stock s4 alternator, and had problems keeping the battery charged at all. Even after a 4 gauge ground wire from battery to transmission. Depending on how reliabable your stock wiring harness is you may/not have problems. But I would at least recomend upgrading to an S6 alternator at some point.



- Hand

use the dual Nissan Altima fans. They out-flowed SPAL and every other major brand. Unless you care about buying brand name

If you are looking for every ounce of performance you can get - going to efans is the smart chouice.

You get about 20pounds of rotating mass off of the engine.

In my case (autocross) or even a drag racers case - you shut off the fans at the start line (assuming your engine isn't on the verge of overheating ( I am usuaaly about 170 at the line)) to reduce the alternater draw. And then turn the fans on when the run is over.

If your car is just a daily driver or cruising machine I would never bother to do the conversion.

However my twin 10" fans cool the rad MUCH better than the stock fan ever did

[quote name='rowtareh' date='Aug 24 2005, 06:00 PM']curious to know too. it just seems kind of silly that they were not the same size radiators. is it thicker, wider, longer? what is it????


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the koyo is a little wider and longer and the rad cap is in a different position then on the s4.

[quote name='Apollorx7' date='Aug 25 2005, 04:29 PM']the koyo is a little wider and longer and the rad cap is in a different position then on the s4.


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ok, thank you. just was curious, it helps other people when they search....