I have not done this YET, but I have heard that it is not just what hp you gain. The pulley brings you up the rpm range faster. It puts us in the high rpm where the LS1 really gets moving!

 

I have had my ASP pulley on my engine since the car was new. I gained about 8-10 hp and .1 et. A good side benefit is the added protection of reducing the possibility of over spinning your alternator. At 6600 rpm with the factory pulley that alternator is sure turning awfully fast. Even extends the life of the ac and power steering not to mention all the idler pulleys by turning everything slower.

My factory battery lasted over 4 1/2 years with the crank pulley and underdrive alterntor pulley. Even when I replaced my original battery it was working fine. Just didn't want to take a chance any longer.

Get the pulley, good mod!

 

Flow Tech LT are $379 ceramic coated, LM is emissions legal and easier to install. Sure you can get a cutout, but in most states its illegal and if you ever have to pass a visual inspection they sticker man is gunna tell you to take it off. Plus i would wrather have 3" pipes then a cutout anyday. Y pipe goes with exhaust i was just saying, that there are better mods to do first. Mods that make power that you can feel. A pulley alone is just not going to do much, as stated it is a mod that builds on your other mods.

 

LT, not to 2nd guess you, but yes the pulley wont give much of a hp gain, it is like a gear change(no hp by the way), you getty up much faster, no?

 

No, the pulley will not add horsepower, but you will see more power on the dyno. The pulley frees up horsepower that you lose from drivetrain loss.

 

Yeah right. How much HP can a alternator or power steering pump
suck off, come on! There is a point at which neither will take any more power away and most are based on RPM, how much rpm are
you adding down the road?

And the way mine idled after a pulley install with A/C on at
night was un tolerable, head lights going up and down, and datamaster logs showed havic with injectors.

Not worth it in my opionion, especially if you don't put a smaller
alt pulley to speed it up but then your only saving on the HP the
steering pump takes away.

 

And the water pump and the air conditioner ({I think) but it is a proven gainer, just it frees up horespower, and you would be surprised at how much those things take up. Turn your ac and floor it, you won't be happy.

 

On my 2002, my ac seems to kick out (turn off the compressor) at full throttle. Wide open=no difference (though I am looking at pulleys as well, just stating that is not a good test).

 

Most alternators use about 1hp for every 22 amps of output. 100 amp alt is about 4hp or so. Power steering pumps have to pressurize fluid, that takes hp. I don't have a "hard" number for that one....

 

Well my water pump is driven off the cam, not the belt. I also
turn my A/C off at the track, most tracks also ensure your
A/C is off, wet tracks suck.

 

Why would your alt be putting out 100 amps? Turn the ghetto
blasters down a few db.

 

Simply stating the potential hp drain.

Turn on the AC, lights, rear defroster, radio, wipers, interior fan, the cooling fans for the radiator and start rolling down windows. I bet you will use more of that 100 amps than you think....even without the windows and power seat (you don't run them constantly). I've seen radiator fans that use anywhere from 7 to 30 amps (we have 2, but I don't know the draw). Add in the AC clutch (several amps, they used to be about 6-12 amps, not sure if they are better these days). 2 headlights at 55 watts each (roughly 4 amps each and don't forget driving lights), add in the tail lights, marker lights, brake lights and such. Don't forget the HVAC fan (probably 10 amps or less). The rear defroster, that can be a pretty good draw (usually a 20 or 25 amp fuse, figure 15+ amps). Windshield wiper motor (7 amps?). And so on. They don't put 100+ amp alternators on these cars for their health. If they could use less/cheaper, they would. These cars can draw the bulk of that output under certain conditions. Fire up the ABS solenoids and/or the traction control and you've got a few more current hungry items that may put you close to the top (for peak loads).

Anyway, just something to consider.

 

BUT NOT when your doing 1/4 or racing so what's the point? When I race I turn off everything but the fans.

 

is it possible that some of us like to have a little more power at times OTHER than racing? wow...what a concept i never drag my car (least not at a track) but i do alot of spirited driving, not even WOT...so yeah..that 4-6hp does make a difference to me

i like my pulley, not sure of the power gain but it does seem to rev a bit faster. and i have no problems with charging...then agian i don't use the AC at all (even in S florida).

 

If it ONLY free up a few hp, then why do: the ls6 intake,lid,ram air,tb,tb bypass,maf,descreen the maf,gears(they dont give any hp just like a high stall cony,no hp gain!),shift kit, ect..............The point is, add it up, if you dont add 5-10hp here and there, those stangs and rice burners will eat us up. The pully gets our rpm up faster,you know our "sweet spot".