[HWYSTR455]

SPAL brushless fans are excellent, and are PWM friendly. They are one of the most efficient fans on the planet.

Some of the newer OE fans actually have the PWM controller built into them.

I run the 'vette PWM controllers on my GTO, the Dominator ECU controls them.

The SPAL brushless fan motors are very flat, and make it easier to package in a tight engine compartment. Super efficient and freewheel effortlessly. But in some cases, the water pump snout can get in the way of 1 large fan configs, so 2 smaller offset fan motors is the only option. (That's how I ended up).

I wish I would have gotten the SPAL brushless fans, but somehow talked myself out of it. My setup does creep a little, and on a 180 stat I run 190, 200 with AC on. I think my problem is the rad, which is one of the Champion type aftermarket ones, so I recently got a Cold Case. If that doesn't keep it where I would prefer it, I will swap the fans out with SPALs.

I run the fans at 30% below 170, 170-180 at 40%, 180-195 at 70%, and then 95% up. I do a 10% bump when AC is on.

I had a variable of MPH too, and over 50mph I ramped them back up to 70mph where they would freewheel, but the motors and blade type must be enough of a restriction that I had to remove that. I thing with the SPALs I could add that back in.

Shroud is properly designed, spaced, and has reliefs.

I'd be interested in how you make out Gator67, please post your results once you get to that point.



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