Racetronix Dual Fan Wiring ?how do you get high/low speed ????

[National Newb]

I bought a new racetronix dual fan harness that is advertised to have the High/low fan capability...

I understand they have independent circuits to make this option feasible...

BUT

Since many peoples "spal" and my summit dual fans are single speed.....

Was anyone able to wire them up to have both high and low speed????

I would really like to keep the two fan speeds in the car....

If so how????

Did you put the stock resistor in line????


Thanks all!!!!!

 

[TurboDave]

It would be far more practical if you used the low speed circuit to run one fan, and the high speed circuit to run them both.

 

[Racetronix]

I bought a new racetronix dual fan harness that is advertised to have the High/low fan capability...

I understand they have independent circuits to make this option feasible...

BUT

Since many peoples "spal" and my summit dual fans are single speed.....

Was anyone able to wire them up to have both high and low speed????

I would really like to keep the two fan speeds in the car....

If so how????

Did you put the stock resistor in line????


Thanks all!!!!!

1 - Did you post this query on our support forum?
2 - Did you buy this harness: Racetronix - Turbo Buick Dual Circuit Fan Harness

 

[National Newb]

yep, posted on your forum too.....

yes bought that same harness

I think I figured it out on my own... I just bought a second stock fan resistor and will wire in so that each fan will have its own dedicated resistor on low speed , but full current on high...

will do a whole post on this and the fan setup when it is done and operational ... as I purchases dual 12" s blade fans from summit/jegs that fit like a glove...

 

[turbo nasty]

Did you PM me asking about the fan wiring on the other board??

My experience with these cars and running a 160 tstat you are going to need high speed 95% of the time in the warmer months. And high speed for sure when running the A/C

The stock resistor added more amperage to the circuit to make low speed, 1 addition will raise that even more.

What radiator you running.

Running high speed all the time has no downsides.

These cars had 195 tstats stock. the high and low speed may come in to play when running that temp.

Lower the tstat temp 35 degrees and trying to maintain that temp realm then its a whole different story.

Either way good luck with it, so far so good with my Jegs fans.

 

[Gnx6]

I bought a new racetronix dual fan harness that is advertised to have the High/low fan capability...

Most of the Dual fan kits from the vendors that this harness was made to work with had Dual motor windings. One set energized would be slow speed the second set of windings would be high speed. The racetronix fan harness kit is very versatile and can be configured in many ways for any dual fan setup.

 

[turbo nasty]

Jegs fans only have one speed

 

[National Newb]

I have a new griffin aluminum 2 core that is 2.5" wide.... nice piece... and am running a slic with a added B&M stacked plate tranny cooler....

The only reason I wanted the slower speed was to prolong the life of the fans.... That full on/ off... full on type setup is more likely to burn out those fan motors as these jegs/summit fans are not spals.... if they start up slow then kick to high they should last longer. less of a wack on startup, but murphy's law usually prevails....


The altenator is not going to use more or less power with the resistors in place... the motors pull the same amount of amps either on high or "resisted" to a lower speed...

also, once the A/C goes on they will switch up to high anyway...

my car was running at 185-195 with a 160 t stat on a mild day...
. last year with the A/C on it was up to 230 -240 at idle

so... pulled the stock rad (which had no leaks but I am sure needed to be boiled out..) and the stock fan....

put in the griffin aluminum (with oil and tranny cooler) and an extra B&M stacked plate tranny cooler in front of the condenser, and fixed the stock airbox,,,,

will post the results in a week or so

 

[turbo nasty]

I hear ya on the fan motor life. My stock fan was still doing fine when I removed it after 7 years of service with the resistor jumped out. I think it boils down to the quality of the motors, the RC fans dont last and hopefully the Jegs ones will.

The low speed is due to the voltage drop from the Resistor in series with the fan(s).

Add a resistor to the circuit the total ohms (load) goes up and voltage goes down after each load. Therefore producing higher amps.

In a series circuit Total resistance/Rt is the sum of all individual resistances.

 

[Racetronix]

The only reason I wanted the slower speed was to prolong the life of the fans.... That full on/ off... full on type setup is more likely to burn out those fan motors as these jegs/summit fans are not spals.... if they start up slow then kick to high they should last longer. less of a wack on startup, but murphy's law usually prevails....

The motor bearings usually give out well before the motor brushes do.

The altenator is not going to use more or less power with the resistors in place... the motors pull the same amount of amps either on high or "resisted" to a lower speed...

The alternator puts out power. The draw on the alternator and engine load will be higher with the high speed fans on.

The fan motors will draw less current when resistors are wired in series with them. Current (electron flow) is a function of the supply voltage (electrical pressure) over the circuit resistance. (AMPS = VOLTS/OHMS). Some power (watts) will be dissipated across the resistor as heat. The power dissipated is a function of the current flowing through the resistor squared times the resistance itself. (WATTS = AMPS^2 x OHMS).

 

[turbo nasty]

Dont forget about inductive reactance from the windings...

This has gotten carried away...LOL

 

[Racetronix]

Add a resistor to the circuit the total ohms (load) goes up and voltage goes down after each load. Therefore producing higher amps.

Adding a resistor in series with the fan motor increases the circuit resistance and reduces the load current. Amps are not produced they are drawn as a function of voltage over resistance.

> HERE IS A GOOD LESSON ON OHMS LAW <

 

[Racetronix]

yep, posted on your forum too..... yes bought that same harness

There is no post from you showing in our fan harness support forum?

Based on what you have been posting here and the replies you have been getting I recommend that you revisit the Racetronix support forum.

Jack

 

[turbo nasty]

DOOH.......owned. What can I say but I was mistaken.

 

[Racetronix]

Dont forget about inductive reactance from the windings... This has gotten carried away...LOL

Since this is a DC load your 'inductance' comment is irrelevant to this application. The fan motor's start-up current is something to consider but since the Racetronix harness uses 40A HD relays, 10 gauge wire and 46A connectors there will not be any reliability issues.

It is important to use the proper terminology and understand ohms law here. People in this thread are throwing around words like draw, current, resistance etc. but their meaning and how they interrelate are quite obviously misunderstood based on what I have read here. Hopefully my posts have helped to clarify what will happen when adding series resistors to your fan motors.

Jack

 

[National Newb]

There is no post from you showing in our fan harness support forum?

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Posted it under your general discussion forum...no replys as of yet. BUT Thankyou for your replys and assistance via this board....[B]GO OHMS!!!![/B]


Posted on here because this board always has a good group of knowledgeable guys.... may have to take things with a grain of salt at times,, but if not for a board like this.. I would have had to sold this car a long time ago...I dont post that much because I dont respond unless I am 100% sure of the correct answer..... I brought my car to a "Grand National" repair shop that I wont name... and have still been reversing their mistakes (no turbo gaskets, no DP gaskets, waste gate linkage, wireing, snapped my rear bumper fillers, etc)

Just a fools observation... but I think it would be nice to have had the instructions that were laid out in your forum included in the package... those are nice pictures and instructions that were in your forum... just feel that someone should not have had to go and register to a forum searching for instructions. ..one piece of paper would cover it...BUT I also understand that this product could be used in many applications and constantly changing fan systems.......... I guess I am just a bit lazy....:cool:

As far as quality... haven't installed it yet.. BUT the quality of your product appears to be quite nice, high quality and substantial... I have no fear that it will perform to my expectations or any others for that matter....The reason I chose yours over caspers, and I like caspers products as well, was the two independent circuits (to have a high and low speed) and fuses over a link... I like options!!

Shame on me for not researching the ramcharger fans to see that they have two speeds built in w/o resistors....but since these summit/jegs fans fit so nice, and I believe cover more of the rad than RC and spals, and pull less amps than spals...I hope they survive......

Worst case is that I pull the resistors and run on high all the time till I smoke the motors...:rolleyes:


Thankyou all for your help!!!!!!!!!!!

 

[87GN_70GS]

Since this is a DC load your 'inductance' comment is irrelevant to this application

Not necessarily, if you consider the time constant which determines the transient dynamics at startup (e^-(R/L*t)). This doesn't need to turn into an electrical engineering primer on circuits, but was mentioned here for completeness.

 

[HP Man]

My GN had the old RC fans, they ran both speeds and were controlled by the ECM just like stock. I have designed my own circuit that doesn't over load the factory wiring. Both fans ran low speed and high speed, plus used the manual switch to boot. High speed they draw over 30A, I'ved done an amp draw on the motors test. My fans were still running after many years of service, more than 5yrs, sold the car but the 86 T will have this system installed on it for sure. Results 167* in stop and go traffic with a FM IC, 160* hwy temps. This was a 3 row copper/brass radiator w/o trans cooler. (big heat source to the coolant, trans runs at 195* or more) Been there and tried several systems to get it like this. MHT Gene

 

[salvageV6]

Here ya go if the stock resistors won't work (too much current could be an issue with aftermarket fans).

Just put them in a box down near the fan area with short wires out to the fans.

Mounting can be done with angle brackets etc. easily.

Fully adjustable for speed and a good 2-3 times the current handling of a stock resistor in the working area you will be using.

Keep the box isolated from ground and cover the connections and slider adjuster tab with 33+ elec. tape inside the VENTED box.

Easy to make work with just about any high current fan setup.

Oh yeah they can control a Shurflow type alky. pump at whatever speed(s) you need too.

1.0 OHM/240W ADJ. POWER RESISTOR-MPJA, Inc.