Gktech Fan On Rb25

[Chris32]

I managed to get a gktech fan cheap during one of their sales a few weeks ago.

I installed it on the weekend, and have driven it for the past 3 days.

The only temp gauge I have to go off is the oil temp gauge on my GTT, and that has dropped from 82-85 down to 75-80 on normal driving, so I assume the whole engine is being cooled better with the gktech fan.

However, the fan does seem pretty noisy. I've had a viscous hub fail on the fan before, which makes it sound like a EL Falcon all the time! With the gktech fan, it has got that 'roar' back of a dud hub on the fan. Even at low to mid rpm, the fan is roaring.

I'm not sure if its just the fan blowing more air, or if my hub has shat itself with the change of fan blade/load. I haven't had time to swap the old fan back yet, and decided I'd seek an opinion before changing it over.

If anyone else has one I'd appreciate your feedback

Cheers, Chris

[Kris..]

its just the fan, Greg said they will be noticeably louder

[Chris32]

Ok, makes sense if its going to push more air!

[34GeeTeeTee]

Interesting to hear some feedback from someone using one! I have one sitting in my car that i was going to fit... Not sure if i want it much louder tbh but i guess the cooling will be worth it for summer anyway! Decisions

[Chris32]

Mines loud enough to hear it in the cabin with the windows up, although my exhaust isn't very loud.

To compare it against something, the fan noise is louder than the induction noise with the stock airbox until about 3500rpm (by then its approaching full boost on the stock turbo)

I'm undecided if I can live with it, I might just keep it for track days etc

[34GeeTeeTee]

Hmmm so significantly louder!! I might just leave mine off while its still getting street driven... Will see how it goes i guess! Are you sure its not locked up all the time? As if its running cool the hub should be free spinning and quiet i would have thought?

[Chris32]

Thats what I'm trying to work out. I'm pretty sure its not locked up, as I can rev the engine and the fan speed only increases a little bit. I've got a spare hub that I know for sure isn't locked, however the bearing has a bit of play. If I get chance I'll swap them over and compare noise

[hardsteppa]

mine does the same thing, quite loud, with no difference in how much the fan slips on the clutch. From reading threads about this on other forums, my understanding is the design of the nissan fan incorporates trying to minimize noise as well as move air volume, whereas the gktech fan is designed for moving maximum air and reducing drag, and not much concern given to the noise factor. Something about the tapering out to a thinner point at the tip of the fan, greatly reducing drag at higher rpm. Ass-dyno tells me it 'feels' better at higher rpm, but yeah quite roar-y driving around in traffic esp when cold.

[GH05T]

do you feel the extra load on the engine with more pitch pushing more air/drag?

[Chris32]

do you feel the extra load on the engine with more pitch pushing more air/drag?

Other than the increased noise, the car seems to go just as well. I'll watch the economy to tell me if there is any extra load on the engine overall

[Kris..]

got one on my car, did nothing temp wise

[Chris32]

Pulled it off over the weekend and put the stock fan back on.

The extra noise got pretty annoying, especially when driving on open/windy roads where you are on/off the throttle.

I'll chuck it on if I am going to do a track day, but for daily duties the stock one wins because of the lack of noise. My fan hub is working fine also.

[34GeeTeeTee]

Pulled it off over the weekend and put the stock fan back on.

The extra noise got pretty annoying, especially when driving on open/windy roads where you are on/off the throttle.

I'll chuck it on if I am going to do a track day, but for daily duties the stock one wins because of the lack of noise. My fan hub is working fine also.

Thanks for the update, good to know

[oea]

Bumping this and confirming that the GKTech fan is loud as hell.

Also:

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Went back to OEM after that lol

[34GeeTeeTee]

Ummm... Wow!

I was initially one of the guys complaining about these fans until i found that JEM had fit the damn thing backwards! So that made me look like a goose!

I have been spinning mine to over 8000rpm for long periods at the track and have had no issues at all and the cooling system has been spot on ever since.

You sure you didn't break an engine mount or something else as that sure looks like contact of some form? Ouch!