Loud Fan Noise & Lacking Boost

[mcpybo]

Hello everyone,

I am new to the forum (long time lurker, first time poster). I was wondering if anyone could give a an idea to a problem I'm finding myself having with my 94 R33 GTS-T.

After owning this car happily for 3 or 4 months, i noticed my car all of a sudden had a incredibly loud fan noise when I accelerated (imagine a steam train) and a lack of boost, still spooling, just a considerable amount less. Due to a busy work schedule at the time I took it to a mechanic near me. He just changed over the spark plugs and had it to me that night. Everything back to normal.

After that day due to breaking my leg, the car sat unused for 5 weeks and of course when i was fit enough to drive it, the car developed the same issues after at least 300km of driving.

I talked to my mechanic who said the fan clutch had sized and buy a new one. I had him install it as i was still unable to do so and still the same issue. Nothing fixed.

Took it to another mechanic with a dyno in their shop and they said car is supposedly running fine and dont hear anything out of the ordinary. Now I'm new to this scene (turbo cars), but I'm sure no car changes characteristics just over night.

It's been incredibly frustrating and hoping anyone can shed some light as to where I should be looking?

Cheers.

[GH05T]

clutch fan has seazed, what did he actually replace?

Edited October 6, 2013 by GH05T

[mcpybo]

First time: Spark Plugs

Second Time: Clutch Fan from Davies Craig

Usually my thought was that the fan when car is cold should be able to turn freely when pushed, about a quarter of a rotation correct? The "new" clutch fan wont spin freely at all and has quite some resistance.

Have heard it is possible for these to be already seized out of the box due to being stored in very warm temperatures. Have had it happen to a friend once.

[GTSBoy]

No. My experience with replacement fan clutches is that the ONLY ones that work on RB25s are the Nissan ones. The Delco and DC ones are both set to come on too quickly, and so end up noisy and horrible. This will change with ambient temperature, which can explain variable behaviour.

Find a good 2nd handy or spend the ~$300+ for a genuine one.

[mcpybo]

No. My experience with replacement fan clutches is that the ONLY ones that work on RB25s are the Nissan ones. The Delco and DC ones are both set to come on too quickly, and so end up noisy and horrible. This will change with ambient temperature, which can explain variable behaviour.

Find a good 2nd handy or spend the ~$300+ for a genuine one.

That could explain alot. Obviously when you have that working back to normal, then back comes the power correct? Excuse my ignorance

[GTSBoy]

Yeah, the lack of power is half real, half imaginary. You just tend to get right back off the throttle when it starts makign so much noise. And in truth, spinning those old plastic fans hard can lead to them shatterring anyway, so it's only smart to let it get in your head.

The fuel consumption usually goes to crap also.

[r32-25t]

Also driving those fans constantly draws a lot of power from the engine

[mcpybo]

Thanks guys.

Hopefully if work permits I can start the search tomorrow.

Cheers.