What 1 or 2hp if that. Thats not worth the $75 bux for that junk. You would lose any gain from the lose of voltage to the fuel pump and ignition, injectors, ect. It's not worth 10 bux. You want max voltage @ WOT.

 

Like I said before, Battery voltage is hardly going to drop in a 10-13 second 1/4 mile run. It it would be well over 1-2 horsepower that would be "redirected" to the rear wheels instead of turning the alternator.

 

Well over 1-2 hp.Tell me how do you come up with that???? Did you ever spin your alt with the belt off. How much resistantce did it give you. If it didn't turn freely then you have something wrong with your alt. And yes batt voltage will drop that much w/o the atl @ WOT in the 1/4. And how do I know that? Running data master @ the track with the belt off. Dropped off below 10 volts and started to break up @ 1/8 mile.

 

How long were you running without the belt before it dropped below 10 volts?

The advantage to the switch is that you're only running without the alternator for <15 seconds in the 1/4, and in that short amount of time a healthy battery won't drop that much.

Now, I am not vouching for how much, if any, additional horsepower this might provide - only that in theory it might give you a slight gain.

 

The belt fell off right at the tree at Wot. It did it twise back to back. Optima battery was at full charge. Fuel pressure dropped due to low voltage. Which caused it to lean out. Not a good thing.

 

maybe if you could find a way to turn off you power steering, but not alternator, it takes little to no power to spin an alternator even at full draw. there is some slight pull, but definitley not a horsepowerdifference, if you want to spend 75 bucks to shave .002 off you quarter mile time, then give someone who knows how to drive 75 bucks for a lesson on how to launch. itll be money better spent

 

I thought i heard anything below 12.5-12.7 volts going to the pcm will start effecting sensors, fuel pump out put, and your spark.

 

The alt. obviously takes more of a load with the engine running and the field in the alternator powered up than it does with the belt off and the field not powered up. Unplug your alternator and let the battery drain to about 10 volts then watch the IAC pid on a scan tool when you plug the alt back in and tell me that it is not putting more than 1-2 HP load on it. And your battery must have been junk to drop that much in a 1/4 pass, either that or it takes you 30 minutes to make it down the track. Hell the girl that lives down the street from me drove here car for 3 days with a bad alternator after her dad replaced the battery, the they charged the battery and she drove it another 3 days before it went dead again!

 

A good battery will hold 12.5-12.7 for a couple minutes on a running vehicle

 

Right Run datamaster and disconnect the alt and see what voltage the pcm is gettting when running down the track and watch how voltage affects everything. More importantly watch ignition voltage. It does a job on aftermark ignitions and voltage drop to the fuel pump tends to slow it down causing it to lean out. The battary is a 3 yearold Optima. Which I guess is junk because you say so. Another LT1 Master I guess. Maybe I should by this junk to cut off the power to the alt so I can run a 12.90 run in a 1/4 mile with out the extra voltage power boose from the alt. Maybe I should inform companies like MSD and others that make parts that boost voltage @ WOT for fuel and ignition that there wasting there time and peoples money. Just because your trying to sell this bs to cut voltage from the alt to gain 1 to 2hp. THAT IS SOME FUNNY SH*T!!!!!!!!!!!!

 

Thats funny! You just said a car could drive a few days with out an alt.. I remember on my 67 camaro. In the day time. Losing the belt for the alt and I just made it to my block. From a few blocks away when belt came off and I had to push it into the drive way. That band new Diehard mush have been junk? Oh and in my Cadilac. When that cheap Pep boys alternater went bad in like 2 sec. The car started running like crap. Then shut right off. It must have been a junk battary!
Oh thank you LT1 Master!!! I'm going to have to start making a list of all the Masters. I'm getting confused.

 

That's right! That would be much better spent. If they want they can send me a pm and I'll set them up with an appointment for there driving lessons.

 

Just use Royal Purple motor oil. That has been proven to give you HP.

 

He said the battery would hold 12.7 to 12.5 for at least a few minutes.

A kid down the street from me bought a new battery for his ricer. He drove it for weeks with a bad alternator before it died. Even with the motor running, I put a voltmeter on the battery and it was measuring 9.x volts - but the car still ran. Not well, but it ran. The alternator wasn't putting out squat, but a brand-new battery was able to at least keep the POS running for quite a while...

 

Running but not well. Check how much hp it took away from that car. If the alt is not working at all. A battary is not going to keep a car running for a few day. Plus a riceburner don't pull the voltage that my car does.