how much hp can underdrive pullies add,
and what are all my pullies for, theres like 7, i know theres the crank, alternator, ac, waterpump, power steering, but theres a few more??

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Trent
---Car---
89 Firebird
305 L03 TBI A4
t-tops

---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's
Pioneer 4way ts-a6985 6x9's
profile cl640 110x4
2 pioneer 12" ts-w303c subs (selling if anyone wants em email me)

Future:im profile 1200sx 900watt x 1, and a pioneer cdx-p1270 12 disk cd changer

 

Don't change your pulleys. The accessories need to be driven at the speed they are, especially the alternator when you've got a thumpin' system like you do. People that are still willing to take the risk of overheating/undercharging have usually reported gains in the single digits, which is usually not enough to feel with the butt-dyno.
You named all the pulleys, except for an idler pulley, but that ratio would never change.
It's been proven that alternators generally steal about 1.5 horses.

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No guts, no glory.

 

ive been thinking about taking out the AC and putting in a water pump, would that increase hp?

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Trent
---Car---
89 Firebird
305 L03 TBI A4
t-tops

---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's
Pioneer 4way ts-a6985 6x9's
profile cl640 110x4
2 pioneer 12" ts-w303c subs (selling if anyone wants em email me)

Future:im profile 1200sx 900watt x 1, and a pioneer cdx-p1270 12 disk cd changer

 

You want to put a water pump in the place of ac?
You already have a water pump! What would the second one do? Spray water into the passenger compartment?

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No guts, no glory.

 

haha no, i was thinking electric inplace of driven, worth it or no?

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Trent
---Car---
89 Firebird
305 L03 TBI A4
t-tops

---Stero---
Pioneer DEH-P730 Premium
Infinity 2way 4652 4x6's
Pioneer 4way ts-a6985 6x9's
profile cl640 110x4
2 pioneer 12" ts-w303c subs (selling if anyone wants em email me)

Future:im profile 1200sx 900watt x 1, and a pioneer cdx-p1270 12 disk cd changer

 

We'll see if we can get NJSpeeder to comment here. He's either done it, or is looking to do it soon.
I don't think you're going to shave off more than 15 horses, and it sounds like a PIA to get to work, what with the increased demand put on the electrical system.
I also heard once that a 12 volt electrical system isn't the best for heavy duty things like that. Of course, drag guys have been doing it for a while...

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No guts, no glory.

 

Just don't forget...Only single digets in horsepower????.....Five horses here Five there after awhile it all adds up!!!!

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92' Camaro RS/Black,T-tops/350 TBI Targetmaster Comp.engine/5 spd/march underdrive pulleys/hedman hedders/3" dynomax exaust/hyper tech stage 2 chip/3.42 gears/K&N air filter/MSD blaster GM coil.......currently setting in my garage impatiently waiting for installation....TPI !!!!!

 

I put the Hypertech Power Pullies on my Formula and noticed a little gain but at night with my lights and stereo on when my car idles it suffers votage drop.

 

The problem with an electric water pump is that it doesn't flow enough at higher rpms (like highway driving). They aren't the most dependable units either, BUT they do free up hp. It's true, ever little bit helps. Did you also know that loosing 100lbs will give you a tenth in the 1/4. So either your car or you need to go on a diet .
If you want a really good water pump for the street, look at the Stewart pumps, I'm convinced they are THE best standard pumps. They are used in Nascar and many other racing applications that aren't sponsored by Moroso, Edelbrock and the such.
As for the power pully, it's up to you. You might end up paying more in the long run. It's not like you're loosing all that much power. You'd be better off somehow ditching 100lbs from your car, that way you make money from selling stuff AND go faster without putting a strain on your electrical system. Best of both worlds .

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, Jon (350 TBI!)
91 Red My website