Ok; let's talk about how much power that Thermostatically controlled monster 7 blade fan actually costs you; not what the magazine says it could.
What I mean is; sure, a big direct-drive 7-blade, hi-attack angle, all steel fan will take some power to spin 6000,
but who in there right mind would run one like that?
Firstly, 30mph in first gear with 4.30s will be ~3900 at zero slip, perhaps as much as 4200 at WOT.So at this speed/rpm,with ram-air coming on line, the fan can be decoupled.
Second;from here on ram-air is gonna do the job.
So if you have a turbo'd engine, which is gonna be smoking the tires still at 30 mph, you already have a preponderance of power so even if that fan sucked 100 hp at 30 mph, nobody would care. Now, if you has a slanty, well yeah that would hurt,lol.
So how much power will that big fan really cost you?
Well,on my rig;IDK and I don't care. It is far more important to me that the stat is open when the rpm hits. So I run a high-flow stat branded 195*, that keeps my coolant at 205*F, to keep my aluminum heads warm.That's my minimum coolant temp. And that big fan keeps the maximum just a couple of degrees hotter, cycling in and out playing tag with the stat. It's all automatic, and 100% reliable.
I have 3.55s and a manual trans, with a 3.09 low in it; so 30mph is ~4100rpm, or would be if I wasn't standing on the skinny pedal.Incoming ram-air decouples my fan, and keeps it off until I slow down. The stat closes up to keep the engine at my chosen minimum, the heads stay warm, and we are cooking!
At idle, I never feel that fan cutting in/out; I suppose it's on full-time as it should be, as the stat is targeting 205*F. The 367 can't feel it, even as I retard the timing to reduce the strength of the power pulses, to idle around the parking lot at 4mph, which being 550 rpm. I do that with a dash-mounted, dial-back, timing box; everybody should have one. But 550 is the minimum the engine has enough power to to this at. I guess if the fan really sucked 30hp or whatever HR said, this would be impossible.
In any case, after about 30 mph my monster-fan, that everybody tells me to get rid of, cuz my car would so much quicker, is now freewheeling in the ram-air stream, and costing me almost nothing.
