Stock fan clutch Vs Fidanza electric fans

bryanf89 · 09-09-2010, 03:32 AM

about 5 months ago i bought a fidanza radiator and fan kit, the fans haven't given me any problems, until now. the fans go on and off at random times. i replaced the fuses twice, each time they were melted not blown. i replaced that with a high voltage screw in type fuse and its been good. now my relay is acting up, i replaced it with another one and its still a no go.

im contemplating about switching over to the stock fan clutch, my question is what difference will it make on the engine's HP and gas mileage? Would it be wise to put the clutch fan and leave one electric fan?

i thought to myself, the electric fans put load on the alternator to draw enough voltage to power them, but the clutch fan uses the engines mechanical energy to spin it, but the clutch fan is more reliable at this point.

MJG · 09-09-2010, 03:42 AM

I have not found any Dyno information to support the RWHP gains from an electric fan.
However, I doubt the gains are worth the effort.
I have owned my 89 for nearly 22 years. Origional stock fan which performs flawlessly.

bryanf89 · 09-09-2010, 03:51 AM

The stock fan is worry and hassle free which appeals to me and coming from a supra veteran ill run with that information. Thanks

cre · 09-09-2010, 04:23 AM

The difference is precisely jack and shit... Jack, meet shit... Shit, meet Jack. Any questions?

You're right, the higher the electrical demands on a generator the higher its resistance to motion.... the stock fan too places a mechanical restraint on the engine. Any difference is negligible. Both require little to no power at cruising speeds where enough air is moving through the radiator to not only keep temps cool on it's own but to also move the fan.

If you're concerned about reducing losses a flex fan and appropriate clutch are probably the best bet as they're lighter, easier to spin, the blades flatten out at higher speeds to reduce resistance AND they're reliable. Do NOT try to use an aftermarket flex fan with a stock clutch... they spin too fast and the blades may come apart or move forward.

But at the end of the day, MJG's got it, there's nothing to be gained that's worth the effort or expense... unless you're driving a N/A... then you're definitely going to need that whopping 2HP difference.

bryanf89 · 09-09-2010, 12:14 PM

Is mjg a company?

MJG · 09-09-2010, 01:52 PM

No, just a Supra fan (no pun intnded) in Washington state.

bryanf89 · 09-09-2010, 02:21 PM

Lmaoo i tried googling you

cre · 09-10-2010, 12:50 AM

ROFL!!! That was great! I was at work when I read it, on the phone no less... I think the person on the other end thought I was laughing at them.

bryanf89 · 09-10-2010, 12:57 AM

lol classic

View Poll Results: Stock clutch vs electric fans
Clutch Fan	3	60.00%
Electric Fan	2	40.00%
Voters: 5. You may not vote on this poll

09-09-2010, 03:32 AM	#1
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Stock fan clutch Vs Fidanza electric fans about 5 months ago i bought a fidanza radiator and fan kit, the fans haven't given me any problems, until now. the fans go on and off at random times. i replaced the fuses twice, each time they were melted not blown. i replaced that with a high voltage screw in type fuse and its been good. now my relay is acting up, i replaced it with another one and its still a no go. im contemplating about switching over to the stock fan clutch, my question is what difference will it make on the engine's HP and gas mileage? Would it be wise to put the clutch fan and leave one electric fan? i thought to myself, the electric fans put load on the alternator to draw enough voltage to power them, but the clutch fan uses the engines mechanical energy to spin it, but the clutch fan is more reliable at this point.

09-09-2010, 03:42 AM	#2
MJG 3" Exhaust Join Date: Mar 2010 Location: Washington State Posts: 125	Stock fan Vs electric I have not found any Dyno information to support the RWHP gains from an electric fan. However, I doubt the gains are worth the effort. I have owned my 89 for nearly 22 years. Origional stock fan which performs flawlessly. Last edited by MJG; 09-09-2010 at 03:45 AM.

09-09-2010, 04:23 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The difference is precisely jack and shit... Jack, meet shit... Shit, meet Jack. Any questions? You're right, the higher the electrical demands on a generator the higher its resistance to motion.... the stock fan too places a mechanical restraint on the engine. Any difference is negligible. Both require little to no power at cruising speeds where enough air is moving through the radiator to not only keep temps cool on it's own but to also move the fan. If you're concerned about reducing losses a flex fan and appropriate clutch are probably the best bet as they're lighter, easier to spin, the blades flatten out at higher speeds to reduce resistance AND they're reliable. Do NOT try to use an aftermarket flex fan with a stock clutch... they spin too fast and the blades may come apart or move forward. But at the end of the day, MJG's got it, there's nothing to be gained that's worth the effort or expense... unless you're driving a N/A... then you're definitely going to need that whopping 2HP difference. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

09-10-2010, 12:50 AM	#8
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	ROFL!!! That was great! I was at work when I read it, on the phone no less... I think the person on the other end thought I was laughing at them. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

09-09-2010, 03:51 AM	#3
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	The stock fan is worry and hassle free which appeals to me and coming from a supra veteran ill run with that information. Thanks

09-09-2010, 12:14 PM	#5
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Is mjg a company?

09-09-2010, 01:52 PM	#6
MJG 3" Exhaust Join Date: Mar 2010 Location: Washington State Posts: 125	No, just a Supra fan (no pun intnded) in Washington state.

09-09-2010, 02:21 PM	#7
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Lmaoo i tried googling you

09-10-2010, 12:57 AM	#9
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	lol classic

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