Fireball

iTrader: (21)

Had an issue last year with something pressing my pusher fan into the rad



Bought a new rad and redid it making sure nothing was touching the fan housing or motor body... Even with nothing touching and 1/4" clearance between the fan and the rad, the f'in thing did it again...

whats wierd is that there was contact after 1/8 mile passes 3 weeks ago (I had the fan off for some maintanence)...but after my last 1/4 mile pass this past weekend...oops I did it again

Hypothesizing that its from wind pressure at 160+ mph..but not 100% certain...I think I'm going to add a piece of 1/8" aluminum bar inbetween the fan and the rad to keep it from happening a lucky third time

kp

iTrader: (34)

Make sure the fan isnt running during a pass?

When they are running they are more of a solid piece at 160mph that something the air can go through.

Fireball

iTrader: (21)

hmmm...interesting idea....

fan was most definately on that last pass based on coolant temps...

kp

iTrader: (34)

Once you pass the rated CFM that fan may as well be a piece of cardboard, thats why most stock setups turn off at a certain mph, they are more of a restriction when they are running at high mph. Unless of course you have no natural airflow like a rear mounted trans cooler its best the fan(s) turn off. Kind of a PITA, another switch to remember, so you are probably better off getting it further from the radiator..

veee8

iTrader: (40)

We were wondering about this last weekend. The BS3 just commands them on and off at coolant temps. Now I know they are coming out with a software update to use a hysteresis like the stock setup to turn them on and off. Not sure if it is out, and how it works.

kp

iTrader: (34)

Yea, BS3 is just temp based, I used a WOT TPS nitrous switch to turn off the fans in my old car with the BS3, this one has a stock PCM and I turn them off at 35mph. I dont have pushers but thats 25 amps of current draw I dont need going down the track

MeanYellowZ

iTrader: (19)

yup, this is the way to go. You can wire up a WOT switch easily using relays and turn off any fans during full throttle runs.

bumpin_records

iTrader: (19)

very good idea.

Fireball

iTrader: (21)

knocked 6 holes in the tubes

found this stuff called superalloy1 which is a 350* solder for aluminum...seems to have worked well...holds 16 psi of water pressure back w/o any leaks