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R32 Gtr Koyo Rad Shroud Vs Engine Fan

SimonR32
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SimonR32 Grand Master

SimonR32

Posted
Posted

Has anyone else had an issue with the fan eating away at their shroud when using a Koyo radiator with stock shroud?

Mine seems to do it at high speed when the air pushes on the radiator just enough so that the shroud connects with the fan.

Never used to do it until I installed N1 engine mounts and happens only above 200km/hr. I thought I had fixed the issue by cable ties on the top uprights of the radiator to the rad support which worked fine which seemed to work ok but it began munching the shroud again at Racewars at speeds above 250km/hr

Pic below of the damage, it's not bad just don't want it to happen with my new shroud/fan

2014-03-24%2018.34.20_zps7qqqs9la.jpg

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

If you watch some old BMI videos you see the Japs carefully cut out the the flat area of the shroud to prevent the fan from making contact...

Let me find a still/photo and show you what I mean.

** edit can't find on google images, and going cross eyed looking lol

SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted

If you watch some old BMI videos you see the Japs carefully cut out the the flat area of the shroud to prevent the fan from making contact...

Let me find a still/photo and show you what I mean.

** edit can't find on google images, and going cross eyed looking lol

I'm trying to get away with no cutting the fan or shroud on the new one

perzn_34 Experienced

perzn_34

Posted
Posted

don't cut the fan at all, a little bit of unbalance on the fan and you pput heaps of pressure on ur water pump as its connected to the fan. my fan had the edges cut and broke my water pump into 9458-239840-3492 pieces at like 7000 rpm

  • 1 year later...
SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted

Update on this, I tried several things including solid mounting the top radiator mounts, getting a new fan, getting a new shroud... All to no effective result and it kept just eating away at the shroud.

Seems to be an issue when you have a Koyo radiator with a stock fan/shroud and Nismo engine mounts.

I've ended up buying a Gktech fan (plus adaptor) and another new shroud and it doesn't hit at all, actually has a reasonable amount of clearance. The Gktech fan doesn't work as well as the OEM Nissan one but still is able to keep my temps in the low 80's in traffic. No issues while on track at all as the airflow is more than effective.

Thought I would post because I'm sure others will have the same issue in the future!

  • Like 4
HarrisRacing Proficient

HarrisRacing

Posted
Posted

thanks for the update. I have the koyo, but it is not installed as of yet. I will likely fiberglass a part in at the shroud and trim it out where yours touched.

Daleo Grand Master

Daleo

Posted
Posted

Update on this, I tried several things including solid mounting the top radiator mounts, getting a new fan, getting a new shroud... All to no effective result and it kept just eating away at the shroud.

Seems to be an issue when you have a Koyo radiator with a stock fan/shroud and Nismo engine mounts.

I've ended up buying a Gktech fan (plus adaptor) and another new shroud and it doesn't hit at all, actually has a reasonable amount of clearance. The Gktech fan doesn't work as well as the OEM Nissan one but still is able to keep my temps in the low 80's in traffic. No issues while on track at all as the airflow is more than effective.

Thought I would post because I'm sure others will have the same issue in the future!

Keep an eye on the GKtech fan; I ran one for a while and found that whilst it could control temps ok for a short while, temp would slowly rise in traffic until reached a point where it could no longer control, and temp would spike from high 80 to over 100 degrees in a very short time. This was whilst using a 3 core 50mm rad, and a brand new OEM fan clutch.

Back to an OEM fan, with nothing else changed and the car would never go over 86 degrees in any scenario

I know Mat Wooten (GeeTeeTee) had a very similar experience to mine with the GKtech fan.

It also sounded like a low flying aircraft all the time which drove me mad.

I had good success with a heat gun and a wooden roller on the shroud to push back the offending area that was fouling the fan under deceleration (engine mounts on the VQ are quite soft).

Just keep a wet rag handy to cool the area your working on as the shroud can sag or go brittle if you overheat it.

SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted

Keep an eye on the GKtech fan; I ran one for a while and found that whilst it could control temps ok for a short while, temp would slowly rise in traffic until reached a point where it could no longer control, and temp would spike from high 80 to over 100 degrees in a very short time. This was whilst using a 3 core 50mm rad, and a brand new OEM fan clutch.

I have done 3 sprint events and 2 track days with no issues. It's not a "traffic" driven car but I have been keeping a close eye on the temps. While the OEM fan kept the temp at thermostat temp at all times in traffic the GKtech rises to the point where the clutch fan kicks in and then stays steady there.

Even when idling in pits after belting the shit out of it on track I have not seen it go above 90deg

  • Like 1
Daleo Grand Master

Daleo

Posted
Posted

I have done 3 sprint events and 2 track days with no issues. It's not a "traffic" driven car but I have been keeping a close eye on the temps. While the OEM fan kept the temp at thermostat temp at all times in traffic the GKtech rises to the point where the clutch fan kicks in and then stays steady there.

Even when idling in pits after belting the shit out of it on track I have not seen it go above 90deg

That's a win then!

I like their products, but the fan does seem a little hit & miss on anything other than SR's.

If it works in your application; you can't argue, and the price is right too.

Sub Boy32 Rising Star

Sub Boy32

Posted
Posted

I had the same problem with a Ron Davis radiator, my fan caught the shroud and jammed while I was on track, at the time I only had my factory dash in there instead of my Racepak IQ3 so I didn't have any warning lights for temps, I didn't realise there was an issue until the Link G4+ put the car into limp mode when the water and oil temps went through the roof.

I've now gone to twin electric fans

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