Jump to content
SAU Community

Changing Fan On Gtr To Thermo Fans?

wingnut999

By wingnut999,
in Engines & Forced Induction

 Share

Recommended Posts

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Thermo's rob power from the engine too, they are less efficient than the engine fan and suck a heap of current from the alternator whenever they are on.

If you set them at a high enough temperature so they barely come on you may be better off, that's my plan. One small thermo and one large one set at different temps may help too.

blind_elk Grand Master

blind_elk

Posted
Posted
If you set them at a high enough temperature so they barely come on you may be better off,
That's how the are supposed to be set up. But very few actually set them up this way. Many set them so they are permanently on, which totally defeats the purpose - all that does is shift the load on the engine from the fan to the alternator.

The problem I had when I tried it (32 GTS4), was getting air to flow through the radiator while the car was moving. I could only JUST get airflow, and the slightest uphill in the road coud induce the fan to activate.

For the few kW gained by removing the load of the fan, it is not worth cooking an engine.

GTRsean Grand Master

GTRsean

Posted
Posted

Well those cars were designed by the manufacturer to use thermos as standard.

A working clutch fan such as the nissans will only draw engine power when at idle or just above, as they are supposed to taper off/decouple as RPM increases.

As they wear out they tend to stay engaged longer and start to sound like an EA falcooon.

51NNA Community Regular

51NNA

Posted
Posted (edited)

When they wear out they stop working i.e you can hold the fan while revving the engine when hot, the viscosity in the gel changes and with the correct type of battery the thermo wont put strain on the alt.

Edited by 51NNA
abr33 Proficient

abr33

Posted
Posted

and with the correct type of battery the thermo wont put strain on the alt.

I beg to differ, it dont matter if your running an n70z or a ride on mower battery if your fan draws 30 amps your alternator needs to make 30 amps, it does however stop the alternator spiking as such.. Unless thats what you meant?

gotRICE? Veteran

gotRICE?

Posted
Posted

So all the WRX's and many other cars that come from the factory with a thermo fan are going too cook there engines? lol...

You ever driven a Falcon? lol

A clutch fan on an E/W mounted engine wouldnt do much cooling now would it?

51NNA Community Regular

51NNA

Posted
Posted

I beg to differ, it dont matter if your running an n70z or a ride on mower battery if your fan draws 30 amps your alternator needs to make 30 amps, it does however stop the alternator spiking as such.. Unless thats what you meant?

Yes, i didnt mean the battery will stop the current draw, but with the correct battery the load would be reduced on the alt, unless the thermos constantly on.

You ever driven a Falcon? lol

A clutch fan on an E/W mounted engine wouldnt do much cooling now would it?

...were did i say "put a clutch fan on a wrx" All im saying is MOST cars come with thermos with no cooling issues and yes ive driven a falcon and worked on 100s, whats that got to do with anything?

abr33 Proficient

abr33

Posted
Posted

On this topic, is there anywhere to but new clutch and fan for rb25? nissan want 750 for it and im not spending that much ill go second hand first, my plastic fan has cracks and the clutch holds the fan on permanently and certainly makes some noise at 8000 revs :-/

Simon-S14 Grand Master

Simon-S14

Posted
Posted

On this topic, is there anywhere to but new clutch and fan for rb25? nissan want 750 for it and im not spending that much ill go second hand first, my plastic fan has cracks and the clutch holds the fan on permanently and certainly makes some noise at 8000 revs :-/

Garage 7 sell both the fans and the hubs at a much more reasonable price then that

www.garage7.com.au

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Haggerty
      RB25DE NEO with Haltech ECU

      By Haggerty · Posted

      @Murray_Calavera  If I were an expert I wouldn't be in here looking for assistance.  I am extremely computer literate, have above average understanding on how things should be working and how they should tie together.  If I need to go to a professional tuner so be it, but I'd much rather learn and do things myself even if it means looking for some guidance along the way and blowing up a few engines. @GTSBoy  I was hoping it would be as simple as a large vacuum leak somewhere but I'm unable to find anything, all lines seem to be well capped or going where they need to be, and when removed there is vacuum felt on the tube.  It would be odd for the Haltech built in MAP to be faulty, the GTT tune I imported had it enabled from the start, I incorrectly assumed it was reading a signal from the stock MAP, but that doesn't exist.  After running a vacuum hose to the ECU the signal doesn't change more than 0.2 in either direction.   I'll probably upload a video of my settings tomorrow, as it stands I'm able to daily drive, but getting stuttering when giving it gas from idle, so pulling away from lights is a slow process of revving it up and feathering the clutch until its moving, then it will accelerate fine.  It sounds like I need to get to the bottom of the manifold pressure issue, but the ignition timing section is most intimidating to me and will probably let a pro do that part.  Tomorrow I'll try a different vacuum line to T off of, with any luck I selected one that was already bypassed during the DBW swap. @feartherb26  I do have +T in the works but wanted to wait until Spring to start with that swap since this is my good winter AWD vehicle.  When removing the butterfly, did it leave a bunch of holes in the manifold that you needed to plug?  I thought about removing it but assumed it would be a mess.   I notice no difference when capping the vacuum line to it or letting it do its thing.  This whole thing has convinced me to just get a forward facing manifold when the time comes though.
    • CF.Panda
      R34 25GT Engine Light 21

      By CF.Panda · Posted

      Update: tested my spark plugs that are supposed to be 5ohms with a 10% deviation and one gave me a 0 ohms reading and the rest were 3.9ohm<, so one bad and the others on their way out.
    • GTSBoy
      Wheel Sizes & Offsets For Skylines

      By GTSBoy · Posted

      9" wheels are a little too wide for a RWD 32. They can fit. People have put R33 GTR wheels on 32s for years and years. But they are a very tight squeeze. This has been known for about 30 years. As I said - there is no difference between a 17 and an 18 in terms of what will fit. The rolling diameter needs to stay about the same as stock - not very much larger. If you increase that, you will start to have problems. If you increae rolling diamater at the same time as yo increase width, you will have problems earlier. as 9" wheels are pushing the boundaries already, you would need to be careful with tyre choice. I would put 8.5s on the front of mine, but would expect problems with 9s.
    • Dose Pipe Sutututu
      RB25DE NEO with Haltech ECU

      By Dose Pipe Sutututu · Posted

      post up screen shots of your injector tables
    • joshuaho96
      R34 25GT Engine Light 21

      By joshuaho96 · Posted

      Diagnostic flow for a code 21 says check signal at the ECU pins, on a voltmeter of some kind it should read 0.1V at idle, 0.12V cranking, 0.15-0.25V at 2000 rpm. Check each coil such that +1, -3 is infinite or very high resistance, -3, +2 should do the same. (-1, +3), (+3, -2), (+1, -2), and (-1, +2) should all be somewhere between 0 ohms and high resistance. If you trace the path from the coil pin all the way back to the ECU in the diagram the resistance you measure at the coil vs connected to the harness should be pretty much the same. 
×
×
  • Create New...