fan reversal

[Bob Denman]

To my simple and well-untrained eye ; it looks like a real game-changer!! :clap: :firstplace: :thumbup:

 

[Magdave]

The fan will not run in the reverse direction all the time, when you speed up to a certain point, the air flow into the radiator will overcome that of the fan and the radiator will cool down causing the fan to turn off...

The period of time between air flow in cools and shuts the fan down WILL end up damaging the fan motor over time. It will over heat.

 

[Gundam]

The period of time between air flow in cools and shuts the fan down WILL end up damaging the fan motor over time. It will over heat.

I have already installed and run this system on my RT for several days now...and I am always watching the temperature gauge during this trail period, the gauge remains stable with no signs of increasing.... if you are worried that you might burn out the fan, then switch back to normal mode....

 

[Magdave]

I have already installed and run this system on my RT for several days now...and I am always watching the temperature gauge during this trail period, the gauge remains stable with no signs of increasing.... if you are worried that you might burn out the fan, then switch back to normal mode....

You are not getting it Sure it may work for a while. take a CPU or Power supply fan and jam it and apply power and wait for it to smoke. A fan is not made to be jammed over and over again and that is what keeping it running in reverse will do or it will pop a fuse your are exceeding the design parameters of the fan. I am not saying you have not done good work but leaving it in the reverse mode is not a good thing.:thumbup:

 

[Bob Denman]

The fact that a system is up, running, and being tested, is a VERY good thing... :clap: :2thumbs:
Time will tell the story... Good Luck, and please keep us posted! :thumbup:

 

[jcthorne]

If your fan is running while you are moving, then you are not moving fast enough for sufficient air flow into the radiator, that's why the fan has to cut in... the "fixed" reverse position is controlled by the Spyder original coolant temperature sensor, so once you are moving fast enough for the air to cool the radiator, it will cut off the fan..... like I have already mentioned, there is no "off" position for the fan, forgetting to switch to different modes will not overheat the bike.... even if all my additional relays and switches should fail at the same time, the system will revert back to the original unmodified circuitry automatically... I wil be posting the schematic wiring diagram shortly...

If the fan is running in reverse and you drive away, there will be zero or very near air flow across the radiator as the fan and bike movement work against each other. Will overheat. The system needs to revert to normal direction flow at speeds above a few MPH.

The idea of a relay off the brake light circuit is actually a good one if it were paired with a time delay relay set to about 2 sec. IE if your foot is on the brake for more than 2 seconds, the fan reverse relay switches. Time delay relays are pretty common items. I think I will start looking into this.

Not really worried about the temp sensor. It may not have much effect while stopped and the engine is unloaded. If it does, it can be moved without too much difficulty.

 

[Magdave]

Personally, if not automatic, I think the best solution is a simple on off BRP switch (for those of us with room) for the DPDT. Turn it on at stop and tap it off when moving. No muss no fuss and no chance of fan damage. We all know this will have little if any effect on the engine bay heat but is a good comfort item. :thumbup:

 

[Bob Denman]

Working a time-delay, into a circuit fed by the brake light holds a lot of promise... :thumbup:

 

[Magdave]

Not really worried about the temp sensor. It may not have much effect while stopped and the engine is unloaded. If it does, it can be moved without too much difficulty.

I am still waiting on the real answer to that if it leans the engine and you are stopped long enough it WILL get hot maybe very hot possibly negating the usefulness.:dontknow: There is a reason it is tucked into the wall of the nacelle with a filter on it.

 

[Bob Denman]

Stopped in traffic; no load on an idling engine...
It won't damage anything.... :thumbup:

 

[Magdave]

Stopped in traffic; no load on an idling engine...
It won't damage anything.... :thumbup:

Wanna bet your engine on that....er..wait... you have a 2014:roflblack:

 

[Bob Denman]

Please believe me; I'm KNOW that I'm not the shaprest pencil in the box... pps:
But this is more about common sense, than it is engineering... (Oh wait :shocked:; that's not my strong suit either!)
There's no load on it as it idles... in fact; keeping a good supply of cooling to it, is probably more important that whatever air/fuel mix is being thrown in...
Unless you're actually adling for a "VERY long time" with the fans reversed, (However you wish to define that term...); getting things spinning correctly should bring everything back to a normal and uncorrupted state of tune in plenty of time to prevent Armageddon... :shocked:

 

[Magdave]

Please believe me; I'm KNOW that I'm not the shaprest pencil in the box... pps:
But this is more about common sense, than it is engineering... (Oh wait :shocked:; that's not my strong suit either!)
There's no load on it as it idles... in fact; keeping a good supply of cooling to it, is probably more important that whatever air/fuel mix is being thrown in...
Unless you're actually adling for a "VERY long time" with the fans reversed, (However you wish to define that term...); getting things spinning correctly should bring everything back to a normal and uncorrupted state of tune in plenty of time to prevent Armageddon... :shocked:View attachment 82167

Think about this Bob. I live outside of Myrtle Beach. There is basically 1 highway in (501) in the summertime traffic can be backed up for 15-20 miles at times. Ambient temps regularly reach 100 deg in the summer months. Obviously I avoid it as much as possible, but lets say you end up in the parking lot. You reverse fans to cool your legs and the temp sensor climbs to 180 just what do you think the ECM is going to do to the fuel mapping? OK traffic moves you give it gas and it starts to clear. How fast do you think that heated nacelle will cool down?1 min or lets say 5 min for the sensor to get back to ambient. During that time the road clears and people are flying so you goose it with the most lean fuel map that can be had. How is that going to affect your engine let alone the plastic parts in front of the fan that were not designed for that heat?:dontknow: That is why the engineers make the big bucks and the solution is slow in coming (as it should be).

 

[Magdave]

The idea of a relay off the brake light circuit is actually a good one if it were paired with a time delay relay set to about 2 sec. IE if your foot is on the brake for more than 2 seconds, the fan reverse relay switches. Time delay relays are pretty common items. I think I will start looking into this.
.

:thumbup: Excellent a Timer on delay relay is a very good idea off the brake light circuit but I would make it for a little longer 5 possibly 10sec to make sure you are actually stopping or stopped. Great thinking.:clap:

 

[Bob Denman]

:shocked: My good fortune may also be my mis-fortune... pps:
I have NEVER had to endure traffic like that...
It's a foreign concept to me.
To test out your situation; you may need to disbl your fan,; let the bike heat up a bit... and then put an external blower out in front of the nacelle, and see how long it takes for things to cool back down... :thumbup:

 

[Magdave]

:shocked: My good fortune may also be my mis-fortune... pps:
I have NEVER had to endure traffic like that...
It's a foreign concept to me.
To test out your situation; you may need to disbl your fan,; let the bike heat up a bit... and then put an external blower out in front of the nacelle, and see how long it takes for things to cool back down... :thumbup:

One size does not fit all Bob and I do not mind being the devil's advocate ( you should have figured that out by now):roflblack:

 

[Bob Denman]

I've figured it all out! :thumbup:
You only need to move to a colder climate; where the roads are WIDE open and unencumbered by traffic!! :thumbup:
(Don't forget to buy a snowmobile too; for the inevitable break in the riding season! :shocked

 

[Magdave]

I've figured it all out! :thumbup:
You only need to move to a colder climate; where the roads are WIDE open and unencumbered by traffic!! :thumbup:
(Don't forget to buy a snowmobile too; for the inevitable break in the riding season! :shocked

I moved here from the Lake Erie snowbelt why on earth would I want to subject myself to that again? Are you nuts? Must be cabin fever setting in on you :roflblack:

 

[jcthorne]

Think about this Bob. I live outside of Myrtle Beach. There is basically 1 highway in (501) in the summertime traffic can be backed up for 15-20 miles at times. Ambient temps regularly reach 100 deg in the summer months. Obviously I avoid it as much as possible, but lets say you end up in the parking lot. You reverse fans to cool your legs and the temp sensor climbs to 180 just what do you think the ECM is going to do to the fuel mapping? OK traffic moves you give it gas and it starts to clear. How fast do you think that heated nacelle will cool down?1 min or lets say 5 min for the sensor to get back to ambient. During that time the road clears and people are flying so you goose it with the most lean fuel map that can be had. How is that going to affect your engine let alone the plastic parts in front of the fan that were not designed for that heat?:dontknow: That is why the engineers make the big bucks and the solution is slow in coming (as it should be).

Not worried about any of the plastic. The temp of the discharge are will never exceed about 215.

On the inlet air sensor thing, you might have a point depending on how quickly it registers the drop in temp. Best bet may be to relocate it away from the hot air.

 

[Bob Denman]

I moved here from the Lake Erie snowbelt why on earth would I want to subject myself to that again? Are you nuts? Must be cabin fever setting in on you :roflblack:

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