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Can FMIC cause overheating?

B0oStEr

By B0oStEr,
in Engines & Forced Induction

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B0oStEr Mentor

B0oStEr

Posted
Posted

I've just bought a Hybrid style 600x300x76mm bar and plate intercooler for my R32 GTSt.

I've been told that bar and plate I/Cs have denser fins than the tube and fin type and that this makes it harder for air to pass through the cooler to the radiator behind.

Reduced airflow as well as the extra heat from the I/C.

How much of an issue is this likely to be regarding overheating?

What measures have people used to minimise the likelihood of overheating?

Eg, positioning, additional ducting, sealing, vents etc.

BTW How much am I going to have to chop up my stock sedan front bar to fit the cooler and piping?

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cameron Mentor

cameron

Posted
Posted

Doesn't make a difference really air is lazy and will go around anything, Their's other object is the road after the intercooler eg: the cooling system for the airconditioner were the thermo fan bolts onto.

I've seen + 1 - 2ºc max on a skyline were the airconditioning system has been removed and this car is fitted with a bar and plate cooler (79ºc operating temp) as were the other skyline with tube & fin cooler and airconditioning system in place it sits on (81ºc operating temp) - other factor's that can make a difference is that this car has a alliminium raditator so it could just be the raditator it self keeping the heat in.

Inless you'r water temp temps start going up past 85+ then don't worrie too much.

As for front bar you'll have to figure that out for you'r self, but usally a fair bit with that size cooler.

:cheers:

Jun

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

Depends on the intercooler setup.

The intercooler should not cover the whole radiator + if you are still running the standard engine fan and shroud it should still run fine. On super hot days mine does not go over 90.

Get a water sprayer setup from MRT in sydney - I run a custom setup which its just for piece of mind more then anything.

Good luck

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

Cameron: my 90 reading was sitting out the front waiting for the girls to get there ass into gear and get into the car (with air con running on a 40 deg day)

Was just idleing itself getting hotter and hotter and hotter....

Mine can sit on 86 after a few good boosts on a hot day - i am running a AVO Stage 2 intercooler with 3" staino piping - there is still room for the radiator to get direct air (through the grill for starters)

My cooler is a Bar N Plate setup - Tube and fin is better for street applications. Are they more expensive ?

Muz Experienced

Muz

Posted
Posted

Also You might like to try an oil cooler (if you don't already have one) as the oil that circulates thru the engine can also add to a latent heat build up in your engine block. The water then has to try and cool that as well. In JGTC now they are using angled radiator and intercooler to allow for more direct cooling of each surface. If you do get an oil cooler, do not mount it in front of the intercooler/ac condensor/radiator setup as you are just compounding the problem of the radiator (being last in line) having a much higher set of temps to cool.

Cheers

Nexus9 Grand Master

Nexus9

Posted
Posted

or you could get a larger radiator cooling fan.

on my old S13 the FMIC completely obstructed the radiator, we used replaced the stock fan with a couple of Zirgen pusher fans, over heating problem disappeared, from memory I think it ended up costing about $300.00 or so.

Cubes Grand Master

Cubes

Posted
Posted
Cameron: my 90 reading was sitting out the front waiting for the girls to get there ass into gear and get into the car (with air con running on a 40 deg day)

Was just idleing itself getting hotter and hotter and hotter....

It won't make a difference as when idling in peak hour traffic there is no air passing through the radiator/fmic anyway. It has to be sucked.

I used to have the temp slowly creep up with a dodgy clutch fan.

I had it removed and 2 x 12" davis thermo's fitted, it helped but still the temp would creep up with the a/c on in peak hour traffic where the AMB button on the temp sensor would read a whopping 59degree's!!

The problem was I didn't have them mounted on a shroud but directly to the radiator. The surface area was not enough.

Removed the fans and replaced it with a stock shroud & new clutch fan and overheating issues dissapeared no matter how hot and how long I sit stationary.

Now when I first start the car in the morning I can hear the fan whooshing rather loud for the first 10secs then it stops.

On hot days in peak hour traffic I can most definately hear the fan roaring away if I raise the rev's slightly over 1000rpm.

But saying that my bar and plate FMIC sits roughly 20-30cm's away from the radiator so its not directly in front restricting air flow.

The fan can then suck air from all the little spots around the fmic.

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