GFB Alternator Pulley

Fkyx · Post by **Fkyx** » Sat May 17, 2008 6:55 pm

Alright, so today I took out my alternator and found that it's running a Go Fast Bits pulley. Naturally, I'd like to save this when I put the new alternator in. Do I need to have a torque wrench for this job, or is it safe to do it with any normal wrench?

douglas vincent · Post by **douglas vincent** » Sat May 17, 2008 7:12 pm

Impact wrench works for me everytime.

Fkyx · Post by **Fkyx** » Sat May 17, 2008 7:37 pm

Can't say I have access to one of those. Do you think a shop would charge me to have them switch the pulleys out?

ciper · Post by **ciper** » Sat May 17, 2008 9:19 pm

I would be impressed if you were able to remove it with anything but an impact wrench.

That is without destroying the pulley!

Wouldn't you get a much larger performance increase by using a relay inline with the charge circuit? That way you could isolate the alternator when maximum power is needed. I've never been a fan of "run my battery down" pulleys.

n2x4 · Post by **n2x4** » Mon May 19, 2008 6:19 pm

You're working on a car without some sort of impact gun? I don't know what life was like before I got mine.

Even a $100 electric impact gun is a good investment.

Post by **Legacy777** » Mon May 19, 2008 6:24 pm

Ciper,

The GFB alternator pulley is smaller then the stock one, so it'll spin the alternator faster (assuming you have a stock sized crank pulley, or spin around the same speed if you have an underdriven crank pulley).

I ran the smaller GFB alternator pulley on my old HO alternator. One word of caution about impact guns is that you could warp the pulley. Some how the pulley got warped. I don't know if it was not on all the way when I put it on last time. Anyway....I'm not using it with my now HO alternator because the new HO alternator is better quality and doesn't appear to have the lower voltage at lower rpms as bad.

Fkyx · Post by **Fkyx** » Mon May 19, 2008 7:45 pm

I'm still in the process of collecting tools for my car. I'm on a rather low budget, so the more powerful tools are taking longer to acquire. That said, I'm not exactly *working* on my car. Just doing things that need to be done. I don't think I'll understand most of it until I have a chance to take the engine out with a friend who knows something about it.

Legacy777, do you think the benefit of the GFB pulley will be very significant if I'm running stock crank pulleys? I'll probably just run the stock pulley until I can find someone to help me out, anyway.

ciper · Post by **ciper** » Tue May 20, 2008 5:09 am

Fkyx harbor freight had an electric one for 20$ a few months back...

Legacy777 wrote:The GFB alternator pulley is smaller then the stock one, so it'll spin the alternator faster

OH, so it was originally part of a matched set? Nice!

Post by **Legacy777** » Tue May 20, 2008 6:04 pm

Fkyx wrote:Legacy777, do you think the benefit of the GFB pulley will be very significant if I'm running stock crank pulleys? I'll probably just run the stock pulley until I can find someone to help me out, anyway.

If you're running stock size crank, then no I don't see any reason or a huge benefit in running the GFB alternator pulley.

Post by **Legacy777** » Tue May 20, 2008 6:05 pm

ciper wrote:Fkyx harbor freight had an electric one for 20$ a few months back...

Legacy777 wrote:The GFB alternator pulley is smaller then the stock one, so it'll spin the alternator faster
OH, so it was originally part of a matched set? Nice!

Yeah it was part of a 3 pulley set, crank, PS, & alternator. The crank was smaller dia. then stock, same with the alternator, so it kept your alternator speed at idle close if not stock.

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GFB Alternator Pulley

GFB Alternator Pulley