Jump to content
SAU Community

Recommended Posts

Ok so when I first got my car it was back in October last year, I never used to notice the clutch fan come on and flick off. Now it seems like once the car has reached normal operating temperature the fan will be on most of the time which has prompted me to write this.

My question is basically what is the normal actuation and cut out parameters for the r32 gts-t clutch fan. I've been led to believe that clutch fans will also cut out at a certain rpm but mine doesn't and continues to wind up well past 4000 rpm.

Then its seized mate, if its an RB20 or 25 you can get replacement fans from Repco for around $100...I had same issue with the one on my GTR, was just sticking on and sounded like a cessna not to mention the motor felt held back...I couldnt find an aftermarket replacement for RB26 (the snout on the hub is longer on the 26 vs 20/25) so I went to an Electric fan and sealed it in the factory shroud.

Exactly the response I was after mate thanks.

I think mine may have become seized after it wore itself down a bit on my IC piping. Was making the most minor contact with the IC piping after the restraint broke its weld and probably over time it has slowly shat itself.

Unfortunate to hear about the rb26 fan not being an easy replaced item...

<cut>

Unfortunate to hear about the rb26 fan not being an easy replaced item...

Can be replaced, have a look through my older posts. I'm sure I've mentioned the part multiple times as I had it replaced.

It wasn't cheap though...

Ok so when I first got my car it was back in October last year, I never used to notice the clutch fan come on and flick off. Now it seems like once the car has reached normal operating temperature the fan will be on most of the time which has prompted me to write this.

My question is basically what is the normal actuation and cut out parameters for the r32 gts-t clutch fan. I've been led to believe that clutch fans will also cut out at a certain rpm but mine doesn't and continues to wind up well past 4000 rpm.

do you mean that it is roaring loudly all the time, or can you simply hear it spinning/drawing air? if it is the latter, then that is how they work. they spin whenever the engine is moving, however when the engine gets hot they engage more and spin a bit faster (and therefore are louder). if it is roaring all the time then the clutch may be stuffed or you may have an overheating issue (don't trust the stock gauge too much).

do you mean that it is roaring loudly all the time, or can you simply hear it spinning/drawing air? if it is the latter, then that is how they work. they spin whenever the engine is moving, however when the engine gets hot they engage more and spin a bit faster (and therefore are louder). if it is roaring all the time then the clutch may be stuffed or you may have an overheating issue (don't trust the stock gauge too much).

Appreciate your thought mate...

My fan's behaviour is irratic to say the least. I guess the main things it does are...

1) Drive to work in the morning - I don't really hear it present which is consistant with the cooler morning temps so I know I don't have an overheating issue and throttle response is excellent, supporting the fact the fan isn't engaged fully.

2) Drive home from work - the fan will be spinning most of the time with it roaring its shit off all the way through the rev range, really annoying as you loose bulk power.

It seams as if once it kicks in, it stays kicked in...like its half broken or something.

The clutch will engage the fan but wont disengage it once it is "fully engaged". I've also noticed that before i had my IC piping fastened to the engine with a metal bracket, the fan had been rubbing on the IC piping and has shaved a bit of plastic of every vain. Could this friction have caused the clutch to wear?

Edited by plan-b

If the clutch is still free spinning with the engine off (and cold) then I dont see you having the problem of it "locking on" when it reaches temp. This would indicate that if the clutch was worn that it would not engage fully at all. But they do free spin normally

Please tell us a bit more info, firstly, What temps are you driving in when it is fully engaged. And secondly how hard are you driving it/how long are you sitting in hot traffic etc, and even what speeds you are doing

It may be a case of your car getting up to temp and then never getting below the temp in which the clutch fan engages. That would mean your clutch is operating fine its just the conditions are keeping it engaged.

Also, are you sure its not still rubbing? As I've said before I never even notice my fan come on, doesnt really seem to rob any power. And I wouldnt think that the RB20's are that inferior that there losing half there power because of a fan lol

If the clutch is still free spinning with the engine off (and cold) then I dont see you having the problem of it "locking on" when it reaches temp. This would indicate that if the clutch was worn that it would not engage fully at all. But they do free spin normally

Please tell us a bit more info, firstly, What temps are you driving in when it is fully engaged. And secondly how hard are you driving it/how long are you sitting in hot traffic etc, and even what speeds you are doing

It may be a case of your car getting up to temp and then never getting below the temp in which the clutch fan engages. That would mean your clutch is operating fine its just the conditions are keeping it engaged.

Also, are you sure its not still rubbing? As I've said before I never even notice my fan come on, doesnt really seem to rob any power. And I wouldnt think that the RB20's are that inferior that there losing half there power because of a fan lol

Ok...

When its fully engaged the guage reads a bit under 2/3, when its not fully engaged it reads a tad over half - in other words it seems to be spot on.

I think you're right with the "car getting up to temp and then never getting below the temp in which the clutch fan engages".

I will have a look to see whether it is still rubbing on the IC piping but it is fastened by a piece of stainless, tig welded to the ic piping and bolted into the head (looks quite original and cool).

When the fan is fully engaged I drive conservatively and dont boost up that much, it is considerably less responsive and if I was to raise the revs the fan would spin all the way to 7000rpm.

Is it possible that the cooling capability of a fan with all its vains shaved down a bit would be less than one in new condition? And consequently this change in cooling capability is causing the engine to not drop that extra couple of degrees to disengage the fan?

We're getting there ay lol

your dropping the surface area available for shifting air by having it "rubbed down" by the intercooler pipes. So yes you have decreased the efficency of the fan. Is it enough to cause issues? Hard to say

your dropping the surface area available for shifting air by having it "rubbed down" by the intercooler pipes. So yes you have decreased the efficency of the fan. Is it enough to cause issues? Hard to say

Yeah tis ay. I might just go the davies craig route using the current shroud...

go to the wreckers and get one off a nissan patrol, unbolt the fan and buy the clutch, the guys at the counter wont know wtf it is and charge you 20 bucks

Which model exactly? I know Patrols have RB30s but the 26 fan will not go on a 30 hub, tried it and the bolt holes dont line up. Also, the 30 fan/hub assembly will not clear the 26 top radiator hose in a 32 GTR either, tried that too.....

I know the 26 hub can be replaced, but to buy one Genuine Nissan is 100s...I got a 16 fan and have also incorporated the air con fan, so one is pushing, one is pulling, works well. Was alot cheaper than a new Genuine hub.

Edited by NSNPWR

When its fully engaged the guage reads a bit under 2/3, when its not fully engaged it reads a tad over half - in other words it seems to be spot on.

If you're talking the factory gauge, then it basically stays in the middle from about 60C -> 115C - it won't raise past middle on the gauge until it passes well over 100C. Keep in mind that the gauge isn't linear at all - you really need something like CONSULT or a PowerPC to read the real temperature.

So that means if your gauge is moving past that center part - past where it gets to just after it's warmed up - then it sounds like you have a major overheating issue - and it's probably a good thing the clutch fan is kicking in as it could be stopping the car from completely overheating.

Have you had the radiator checked out at all?

If you're talking the factory gauge, then it basically stays in the middle from about 60C -> 115C - it won't raise past middle on the gauge until it passes well over 100C. Keep in mind that the gauge isn't linear at all - you really need something like CONSULT or a PowerPC to read the real temperature.

So that means if your gauge is moving past that center part - past where it gets to just after it's warmed up - then it sounds like you have a major overheating issue - and it's probably a good thing the clutch fan is kicking in as it could be stopping the car from completely overheating.

Have you had the radiator checked out at all?

^^same. middle of the gauge for me= 70-90c. 2/3 for me is about 105

  • 5 months later...

just thought id post here instead of starting a new one. my stag has been doing exactly the same as plan failure's car. my fan spins freely when cold. it works normally most the time, but at higher rpm its not disenaging. its definately not over heating. does that mean its stuffed??

also to comment on what NSNPWR said, the r32 fan hub may not fit on a patrol rb30 water pump, but the fan hub from an RB25 neo most definately does. i just tried it on the 30 in my shed and it fits perfectly. so maybe the rb25 neo and patrol fans are the same???

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • My thing I'd be doing, is pulling it out, and just getting the tune cleaned up for now. Before that even happens, checking over everything, like vac hoses, fuel hoses, etc. No point dropping thousands on sensors if the moment you start it back up all the oil leaks out, or it has massive vacuum leaks etc.   But really, to know what to do, depends on what your use case is. Hard core track car? Throw most sensors available at it. Street car, I'd probably just run oil pressure, oil temps, water pressure, water temp, probably fuel pressure too. I don't know exactly what the Link can handle and do with those though. And if it's mainly just to cruise the streets, rather than mountain runs, you can probably skip most of the above if you've already got them in as gauges and warning lights.   PS, inb4 "sell it and buy a modern sportscar"
    • Keen to see the turbosmart data, to date I've only seen negative things in terms of response for them. Very small sample size though.     Hawkins is a big advocate in his videos of the larger rear housings. I managed to make similar power with a lower spec motor on the smaller .8 rear, keeping decentish spool.  The people he works with now are big power cars compared to mine though, mine really is setup to drive around and enjoy.  I don't have any back pressure monitoring though, so couldn't say if its good or bad on my car, just that it does what I want it to do.   Future I want a higher compression more cubes motor to give a bit more bottom end and hopefully the new g35-1150 gets me to the 850 rear comfortably.  But maybe I won't due to exhaust back pressure.
    • No, I refuse to buy their cheap ass crap! I do need to order a bunch of different nuts/bolts to refill my nut/bolt wall though. Maybe you could go for a walk through Bunnings for me? (Or send me some stuff from your work? )   I really struggle to work out how the US standardised to Metric in what the 70s or 80s, and yet, half a century later, there's been little done to actually bring it into fruition. It truly baffles me    On the whole Fastenal thing, I went reading their site (My god they sell a lot of varied stuff!), and it seems like it really depends what store you're near if you can walk in and just grab a few small things, or if that branch is primarily distribution with only a small window of "counter time" available (if at all). That definitely makes it harder, as move locations and it drastically changes your ability for success   For things like your M6x1.0, if you want to work on your own Skyline, and you also have a "home workshop" I'd recommend setting yourself up a small Nut/Bolt wall/section. It doesn't even need to be big at all. Most things depending on the diameter, will be a specific pitch, like the M6x1, M5x0.7 etc. Bigger bolts is mostly 1.5, except for a small number of things and that will come down to torque. From memory bolts for the brake calipers (and other things that need a lot of torque) will end up being a 1.25mm pitch. Save up a few dollars, and order a range of nuts/bolts. If you want to minimise cost a little, buy something like M6 x 40, and M6x70mm (1mm pitch) in both. In addition, buy yourself an M6x1mm thread chaser. That way you have long bolts that you can cut down to size, and then chase the threads out. Funnily enough, I find what I'd pay here for ordering 5 bolts, I can pay about 50% more and you'll get 100 of them.   If that doesn't quite work out due to space / ability to buy plenty up front, then each time you need some bolts, order 100 of what ever you're getting. Put them in clearly marked containers. Over a few years, you'll acquire plenty of different sizes, and will end up ordering less and less. And the cost for 100 bolts won't be much more than you paid for your 5 you needed to order anyway  Just takes a little planning ahead, by investigating what nuts/bolts you'll need, and ordering them before doing the job.     Edit: If it's also primarily for working on just the Skyline, for some reason my brain is screaming that at some point, either Nissan, Nismo, (Or possibly a third party) was selling a "kit" of every nut and bolt in a Skyline, purely for people restoring/rebuilding. It'd likely be quite expensive, but would give you every/any nut/bolt you need for stock/factory things. I'm not sure if it's still available, or even if it actually fully came to market, it's just something niggling in the back of my brain that you could look into further if that sort of thing interested you? (It might have been for the R32 GTR or something specifically too, and not just any Skyline)
    • 90lb/min @ 20psi is wonderful, not so much of a problem with the G35-1050's compressor efficiency (aside from how bad they roll back at higher pressure ratios).  The issue is more to do with the turbine's flow, which is why I'm not sold on going an even higher flowing compressor with the same turbine.  I'd say go back over Motive DVD's testing of the G35 1050 and Hawkins's comments regarding exhaust back pressure issues with it, I'd need to go back but I have in my head he went to the biggest hotside and ended up sacrificing a lot of spool (so it ended up behaving like a bigger turbo) and still had EMAP issues.  I've heard various other experiences along the lines of that. At this stage at least I rate all I've seen about Xonas (for transparency I've not used one directly, but I have spoke plenty with people who have) to have low exhaust restriction for the response they offer for any given setup - basically they allow the engine to breathe, which is good for the engine and makes making power a lot easier.  You arguably don't have to even push quite the same amount of airflow through an engine to make the same power if you don't have the bum plugged up with exhaust gas struggling to escape the engine due to an underflowing turbine.   In terms of reliability, to be fair I've had great luck with Garrett turbos as well - my GT3076R lasted forever, then I sold it and the next owner had no issues, then that car got sold and it was still going strong last I ever heard about it.  The trick is with the old GT-series turbos the compressors etc were no way near as efficient as what we have these days, it was almost hard to push them into severe overspeed situations without having a boost leak or something - and that is what often starts the failure situation.    In terms of your G35 I'm pretty sure you're running yours within sensible limits, something people with Xonas and Precision turbos aren't often so inclined to do.  The "compressor maps" are "Joe blogs ran 45psi through his 6466 so I can do the same" and built their setup to send it to the moon.  I've seen EMAP and compressor speed data where people have actually set that stuff up on Precisions and Xonas which have been run hard and the comp speed numbers are very very exciting at times - like I've seen 76mm Precisions run at rpm that you ideally shouldn't run a G35 1050 lol.   I know people who have run G-series Garretts hard and hard a failure, then replaced them with Pulsar turbos as a cheap "get it going" stop gap with the intent of doing a proper upgrade when THAT fails... and are still running the same thing.   Like anything, ymmv and it's not always to do with the quality or trustworthiness of said product. I've been provided with a bunch of compressor maps for Turbosmart turbos and will update my list based off that, they could prove to interesting reading and an interesting alternative as well.
    • Just cage it, call it a race car, and then fall in love with the chirp chirps through pit area!   Also, this is coming from someone with a completely locked diff...
×
×
  • Create New...