Outer Limits 4x4 Board

Hi all. just wanted to know what the competition rigs are using to keep the trucks cool enough in the soupy mud down in vic...

i have twin thermo fans atm but was thinkin what your thoughs are.it doesn't over heat but i have lights and accessories everywhere and would like to keep the overall current draw down a tad. would the standard fans do the job. have you had any problems??? water spray etc etc, any opinions would be apreciated.

cheers

i use a clutch fan. much more reliable
i have tried the electric fans but the just dont last like the real thing.

if you put FACTORY dual thermo's like on the models before the AU falcon, attached to a temp switch ( so they dont run all the time) they will outlast a clutch fan easy.

and it cools much faster, and is MUCH quieter,

Jes

IMO, i'd go with the viscous clutch fan. I've done the thermo conversion on a few of my cars, and have then switched back to the old fans. To hook up thermos properly, you need a Davies Craig type thermostatic switch, relay, and circuit breaker (lots of parts=more things to go wrong). Then, if you have A/C, it complicates things further.

A second relay is needed (so fans [2] can be operated seperately, and then a diode is needed to stop return signal running back through the A/C swith system. The A/C needs at least 1 fan going for the dryer to work, then the second fan is switched when the temp gets too hot.

Problems were basically EA-EL Falcon twin thermo's draw over 15A, and every week i would have to replace the diode (even a BIG sucker out of a H/duty alternater cooked), cause they kept frying, then NOTHING works.

But being a comp truck, I'm guessing it probly doesn't have A/C.

Coxy

coxy321 wrote:IMO, i'd go with the viscous clutch fan. I've done the thermo conversion on a few of my cars, and have then switched back to the old fans. To hook up thermos properly, you need a Davies Craig type thermostatic switch, relay, and circuit breaker (lots of parts=more things to go wrong). Then, if you have A/C, it complicates things further.

A second relay is needed (so fans [2] can be operated seperately, and then a diode is needed to stop return signal running back through the A/C swith system. The A/C needs at least 1 fan going for the dryer to work, then the second fan is switched when the temp gets too hot.

Problems were basically EA-EL Falcon twin thermo's draw over 15A, and every week i would have to replace the diode (even a BIG sucker out of a H/duty alternater cooked), cause they kept frying, then NOTHING works.

But being a comp truck, I'm guessing it probly doesn't have A/C.

Coxy

hi guys.. i would agree with all coments.. i am pretty sure ill be going back to the viscous fan. i do have ac but how do you's go with a body lift. did you's spacer the radiator down to suit? cheers

i havnt spaced my rad down because i have cut and raised the chassie
but i have heard it works well . i am going to put a mist spray onto the intercooler to help cool it and the radiator in comps.I am using a aftermarket ecu so i can turn the mist on as the inlet temp or water temp heats up


Darren

krimnl wrote:i havnt spaced my rad down because i have cut and raised the chassie
but i have heard it works well . i am going to put a mist spray onto the intercooler to help cool it and the radiator in comps.I am using a aftermarket ecu so i can turn the mist on as the inlet temp or water temp heats up


Darren

Hi, your truck performed quite well all day at the 05 Ateco. apart from that little hickup on the last stage.. its all fun and games

i have removed the thermo fans today. i will be trying to modify the shroud or the radiator mounts later on this evening. viscous is the way to go i think.. how do you find your 4.66 ratios. are yours genuine or aftmkt?

cheers

If you install viscous, you are going backwards IMHO.
why have a fan running all the time when you only need it some of the time?

cut, shut, shoud issues, removal, replacement,
over 2500 rpm your placing drag on your engine which robs it of HP. to many issues to deal with.

When you install OEM electric fans with the CORRECT controller ( does not have to be the Davis craid POS, ( just install 2 line temp switchs to come on at different temps), run the correct rated relays, correct wire, with a auxillary OFF switch for water work, you cant go wrong.

Cheers,
JEs

What about airflow and control for when the A/C is on? From memory, removal of the viscous system on my XR6 allowed an extra 2.5-3.5HP, and no more gushing wind noise at high RPM. I can't see this having any huge improvements on an engines performance in 4x4 terms. Seeing that it takes a fraction over 3HP to turn an alternator in its charging process (full cycle), they level each other out, except ones a 4 piece system, and ones a multiple piece system, vulnerable to water & mud, with many possible problems to pop up.

As far as having to modify everything and having too many parts, and too many thing to go wrong with viscous fans (not saying that anybody actually said this, but..), manufacturers use these systems due to the K.I.S.S. theory. There's the mounting plate, viscous clutch, fan, and shroud. Thats it. No high tech gadgetry - just a simple little system that works well, time and time again.

Just my 2c again,

Coxy

coxy321 wrote:What about airflow and control for when the A/C is on? From memory, removal of the viscous system on my XR6 allowed an extra 2.5-3.5HP, and no more gushing wind noise at high RPM. I can't see this having any huge improvements on an engines performance in 4x4 terms. Seeing that it takes a fraction over 3HP to turn an alternator in its charging process (full cycle), they level each other out, except ones a 4 piece system, and ones a multiple piece system, vulnerable to water & mud, with many possible problems to pop up.

As far as having to modify everything and having too many parts, and too many thing to go wrong with viscous fans (not saying that anybody actually said this, but..), manufacturers use these systems due to the K.I.S.S. theory. There's the mounting plate, viscous clutch, fan, and shroud. Thats it. No high tech gadgetry - just a simple little system that works well, time and time again.

Just my 2c again,

Coxy

A thermofan for 4x4 is goodbecause it allows maximum cooling when you are doing low speed rock hopping & hill climbing where natrual air flow is nill and viscous fan could be not keeping up.
It also helps the car warm up quicker in the mornings.