h2 feeling a bit sluggish when towing, what are my options to increase torque?

[twinmill28]

Originally Posted by [__--MUD--__]

The alternator is whats going to be turning harder now while the fans are on...its not just free electricity. It takes the same x amount of energy to cool the motor down direct mechanically or electrically. We are not talking about gaining extra cooling capacity here, just freeing up extra power...Guess its going to come down to how often the fans are actually running.
I'd really love to see some dyno numbers on alot of this ****.

What? The alternator is turning harder?
The alternator load on the engine will be the same regardless of adding accessories that draw more power, just in bigger power draw cases like stereo amplifiers or winches it may not be able to provide all the power that is needed. An alternator does not have a clutch on it like an a/c compressor, which can load up the engine a little more when it engages. So, no, not extra cooling capacity--but slightly less load on the engine=more power, possibly cooler engine. Gain may be negligible, but it will be a gain no less.
Removing the fan/clutch will free up some load on the engine for less drag, plain and simple. I'm not sure of the gains of doing this, but it does make a lot of sense.

[tomp]

There have been many posted results of electric fan conversion dyno results. It typically nets about 10-25 horsepower. It's a no-brainer upgrade! These hp gains are at the wheels! Use Google

[[__--MUD--__]]

Originally Posted by tomp

There have been many posted results of electric fan conversion dyno results. It typically nets about 10-25 horsepower. It's a no-brainer upgrade! These hp gains are at the wheels! Use Google

I can see 10-15HP at the rear wheels on a 2wd setup. But now I'm talking about an H2 on an all wheen drive dyno. What do you think a realistic percentage is as far as what the transmission and entire drivetrain consumes? Thats what I'm really interested in.

Take that same 10-15HP, I'd be really impressed if we saw 3-5HP off that. What ever that comes out to, if you look at the $ per HP gain, I dont think it would be in a reasonable/justifiable. Take the cost of all these small net gain mods, and apply that money twards a supercharger or other large power adder, you'd be much better off.

Again i'm not disputing you wont get something out of it, but your not going to feel that by the seat of your pants in our rigs.

It good to see you back active across most of the forums. You were a little distant for a while there.

[guruerror]

Originally Posted by [__--MUD--__]

I can see 10-15HP at the rear wheels on a 2wd setup. But now I'm talking about an H2 on an all wheen drive dyno. What do you think a realistic percentage is as far as what the transmission and entire drivetrain consumes? Thats what I'm really interested in.

Take that same 10-15HP, I'd be really impressed if we saw 3-5HP off that. What ever that comes out to, if you look at the $ per HP gain, I dont think it would be in a reasonable/justifiable. Take the cost of all these small net gain mods, and apply that money twards a supercharger or other large power adder, you'd be much better off.

Again i'm not disputing you wont get something out of it, but your not going to feel that by the seat of your pants in our rigs.

It good to see you back active across most of the forums. You were a little distant for a while there.

...I hear you on that one. A little research on the fans has tempered my enthusiasm. LOL! $600+...even if you do get 25HP. That's like $24 per HP...at best. If you factor in labor to raise the cost and you actually end up netting less power it becomes even less attractive. At $800 with a 5HP gain you're paying $160 per HP...

Good logic MUD...

[[__--MUD--__]]

Originally Posted by twinmill28

What? The alternator is turning harder?
The alternator load on the engine will be the same regardless of adding accessories that draw more power,.

Ok...Dont get pissed off at me, but in my opinion your wrong. I wish you were correct as this completely violates multiple laws of energy. You would be rich man...if we could sell this

Your alternator will basically free spin when there is no load on it (it still will want to stop at a point). As your amp load increases, the power required to turn the alternator also increases. An alternator is just an electromagnet. The faster you spin it, the more power it puts out (disreguard the regulator and other bs for now). An electric motor is almost the same exact thing, but the process is reversed. The magnetic fields inside this amazing device are what creates this power, or movement if were talking about an electric motor. As the amp load increases the magnetic fields buld up and collapse. These magnetic forces inside the alt are trying to oppose this rotational movement. My AC/DC instructor liked to describe this like a magnetic compass needle always returning to North/South. The magnetic opposition strength increases as the amp load of the alternator increases (this is the load I'm talking about).

These guys w/ monster stereos that put multiple alts on their rigs 1) for more power, but 2) the friction force on the pulley only allows so much torque. At the super high draws they will lock up or severly slip on the belt. Solution- stay under the slip rating by adding an additional alt. You will strill drag the motor down, but not slip on the belt.

We had an ambulanse in autoshop the same week we were covering principles of electricity. This was one of the best examples as there is no free electricity. W/ the engine running, when all lights and accessories were turned on. The load was so high, it dragged the motor down to almost dying at idle, and any throttle above that just completely smoked the drive belt. They ended up putting two alternators on it, and bumping the idle up a tad.

If you took the pulley off a good sized alt and put a power drill on it, then engage a high load. The drill will either come to a stop, or the drills torque will snap your wrist off.

[guruerror]

Now I'm thinking about an electric fan...

I was reading through this thread from 05: http://www.elcovaforums.com/forums/s...=Electric+fans

Looks like the 2500 fans and Flex-a-Lite fans are the fans of choice...
http://automotive.flex-a-lite.com/ca...%3AHUMMER%3AH2

...or maybe I'll just leave well enough alone...LOL!