749 fan removal question for track bike

[superfly999]

I was looking at my cooling fans the other day and I'm thinking that I would get better airflow through the rad if I removed one. I'm pretty sure the fan on the right side (timing belt side) is the high temp fan and that would be the one I'd take off. This is on a track only 749. I've never had even the low temp fan come on so I'm thinking that the high one can be removed. It just looks to me that better airflow through the rad would happen if the fan and shroud wasnt there.

Tried to search but didn't find much. Anyone do this on a track bike and if so are there any check engine lights? And is the high temp fan on the right side?

[rubber duckie]

why not rewire to stay constantly on?

[superfly999]

Cause at 200km/hr the fan isnt helping its blocking

[timmyho414]

A friend of mine pulled his for the reasons you stated wit no issues.

I pulled mine and got a check engine light. I got sick of looking at the light and put them back in. That and I smashed my LCD and would not know if it was over heating. I put them back in and they are not running when I pull off the track. If I let it idle for a bit after coming off they will kick on. That tells be the bike is at proper temp while on track and the fans are not hurting anything.

[froggert]

i took both fans off my old track-only 749/924 with no issues. the check engine light does stay on, though.

[ZetaTre]

Just jump the two wires with a resistor to keep the light off. You can take a multimeter and measure the resistance of the fan.

Resistors are identified by resistance and power rating. Resistance you measure, power rating you calculate using the basic Ohm laws.

Power (W) = Volts (V) ^2 / Resistance (R)

V of course is 14

Take the power from above and get something greater than that. RadioShack has a good assortment.

I've done it many times with cars when I removed stuff...

Btw, on my 999S the right side is the high temp...

[bentexas]

removed on my 749S race bike

[superfly999]

Originally Posted by ZetaTre

Just jump the two wires with a resistor to keep the light off. You can take a multimeter and measure the resistance of the fan.

Resistors are identified by resistance and power rating. Resistance you measure, power rating you calculate using the basic Ohm laws.

Power (W) = Volts (V) ^2 / Resistance (R)

V of course is 14

Take the power from above and get something greater than that. RadioShack has a good assortment.

I've done it many times with cars when I removed stuff...

Btw, on my 999S the right side is the high temp...

Thanks my man!!! Thats what I'll do. Just to confirm I can buy a resistor of say XX ohms and just solder that to the connector? Anyone know off hand what kind of wattage that fan might be? Cant be much.

Say 20W fan

20W = (14V x 14V) / R

20W = 196/R

R = 196/20

R = 9.8

R = 10 ohms so get a 10 ohm or greater resistor???

[ZetaTre]

Originally Posted by superfly999

Thanks my man!!! Thats what I'll do. Just to confirm I can buy a resistor of say XX ohms and just solder that to the connector? Anyone know off hand what kind of wattage that fan might be? Cant be much.

Say 20W fan

20W = (14V x 14V) / R

20W = 196/R

R = 196/20

R = 9.8

R = 10 ohms so get a 10 ohm or greater resistor???

Well, you got it backward... You won't be able to measure power with the multimeter: that's what you calculate. You measure resistance.

You might not find a resistor with the exact same resistance as what you measure. Get something closer, either way (the ECU actually accept a range of resistance before triggering the CEL). The power rating is what you want to get greater otherwise the resistor will overheat and burn.

I wouldn't solder it if I were you, just in case you ever want to go back. First try just to fit the prongs of the resistor into the plugs and ensure it works...

[Filantroop]

If you have a performance map in your ECU you can change the settings so it won't throw any errors.
This is the way it works on my bike (05 999).