GM controls them differently through the PCM to so it doesn't load up the electrical system the same way that retrofitting them on an older truck does. Also, I believe that the HD trucks still come with a clutch fan for higher cooling capacity.
GM controls them differently through the PCM to so it doesn't load up the electrical system the same way that retrofitting them on an older truck does. Also, I believe that the HD trucks still come with a clutch fan for higher cooling capacity.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
Not mine. Under this scenario, mine has RH on high and LH on low. The only time mine is "supposed" to do hi/hi is in an overheat condition and it hasn't done that. No wonder you had so much draw.Originally Posted by thunder550
HD's have a different radiator and stuff too....and don't come with 145 alt's usually. BTW, I still see your point.
I dunno how yours are wired up, but this is how the Nelson harness does it. Yours could very well be different. I'm just speaking about my own personal experiences.
HD's (any of the 6.0L trucks) have the same 34" radiator that I put in my truck. I was running factory 05+ fans too. I dunno. Maybe I just had some bad luck or something, there are many people out there that seem to have good luck with e-fans, but I think I probably push my truck harder in a hotter environment than most people do.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
lol this is funny ok class basic math here. Less drag from clutch fan equals gain in power and as far as cooling goes my hpm fans could cool a catapiller deisel lol
OK what we need to understand from a towing stand point is e-fans have basically 2 speeds. High and low clutch vans are varible depending on engine RPM and can create more or less CFM's depending on the need for cooling. Thus why they use them on heavy duty apps when towing. E-fans have one max CFM rating and most are not enough for towing. The newer Cummins may have e-fans to help with getting all the air over the 5097986987 different coolers and A/C stuff.
I had e-fans on my 1500 HD turbo truck and they cooled just fine and never any problems but throw 8000# behind it and its a different ball game.
E-fans are great for elminating the recipricating force of the crank. Simple math...less mass to move = more useable power.
The alt provides the electrical system with power and maintains a charge on the batt, when the amperage is exceded then the electrical system pulls power from the batt till the alt can catch back up. If you draw more power than the alt and batt can give is when you start frying alt's. Been there done that....stupid 4000 watt stereo systems pfft.
How many newer high HP cars have clutch fans? How many have e-fans?
E-fans for racing, clutch fan for towing.
Last edited by hebdog; 10-07-2008 at 12:56 AM.
2005 Crew Cab 1500HD aka "Big Beast"
6.0L Cam'd & turbo'd **SOLD**
'03 Cummins straight piped and a programmer
"I bought a Cummins and it came with a free Dodge!"
Well said Aaron.
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
I have the Nelson harness and it operates like I listed. Maybe your Nelson harness was faulty (please don't throw stones)?
LOL
The 34" HD radiator is almost twice as thick as the 34" Denali/Escalade radiator. Maybe you did have the HD and the fans weren't as good pulling through the thicker core?
Hmmm...I wonder if he made a change to the fan harness? Every one that I saw/heard of when I was doing the e-fans worked the way I listed.
I was not aware that there were differences between the two 34" radiators. Interesting.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
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