Ford Mustang: Alternator upgrade after underpully install

So your question is where do you get one?

Well to tell you I had charging problems with my stock pullies and
alt. I put in a 165 amp one and now I can have everything cranked and
it won't drop below 13v. I still have to put under drives on, but you
could just always leave the stock pulley on if you are concerned about
charging.

On Thu, 21 Aug 2003 05:34:35 GMT, Jim Dunn <net>
wrote:
 

I put an Accel unit in mine after same change, great alternator - no
probs in 55K miles, got it through jegs

Andrew
93 GT conv, many mods

Jim Dunn wrote:
 

Alternator upgrade after underpully installIf you dont have charging issues now, try installing the underdrive pulleys without the changing the alternator pulley. This will likely solve any potential problems and cost you nothing.

LJH
95GT

"Jim Dunn" <net> wrote in message news:BB69A7FC.207CA%net...
I've purchased underpullys for my '88 GT and understand there may be some charging issues after the install. I'd like to replace my alternator with one that will do the job. The ALT installed now is a 75 amp unit and needs to be replaced anyway.

Thanks,
Jim

Jim Dunn wrote:
 

What would be the point? The purpose of underdrive pulleys is to
decrease crank driven loads, and therefore increase available power. If
you get a larger alternater you will dramatically increase the crank
load, and cost you power. If you then underdrive the alternater, you get
the same load as stock for the same charging capacity. You're right back
where you started from, except now you VISA bill is $300 higher than
last months.
Spend your money where it will do some good.

--
..boB
97 H-D FXDWG - Turbocharged!!
01 Dakota Quad Sport, 5.9/Auto/4x4
83 GMC Jimmy (beater)
66 427SC Cobra Replica - Project
66 Mustang coupe - Daily Driver



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in article 3f456941$newsgroups.com, .boB at net
wrote on 8/21/03 5:50 PM:
 

You are correct. I will get the same load as stock which is what I'm
shooting for. If I under drive a stock alternator my available volts will
fall bellow what's needed to keep my electrical system juiced. I hate
brownouts and especially hate driving at night with insufficient lighting.
If I'm missing the boat on this, please educate me.

By the way, $300 for an alternator is a bit steep. Where do you buy parts? I
want to make sure I avoid them at all costs. ;-)

Thanks,
Jim

I guess that the only load on your crank is the alternator - I've got a
water pump too
I put the ford underdrive pulleys on my car the third day I owned it
(brand new 93 GT conv, modified a bunch now), got 8hp on the dyno -
alternator output was down significantly (22% underdrive on the
alternator, 14% on the water pump), and coolant got hotter (15 degrees).
I put in an accel alternator(now 400 bucks through jegs- have three in
cars now, only alternator I'll run anymore -won't grenade at high rpm,
all ball bearing) and a new radiator from ron davis - hp was down 3,
temp was down 19 degrees.
Moral of the story is that for a grand I got 5hp, a bigger alternator,
and a better radiator. These were needed down the road, but unless you
are goin to mod your motor hard, I'd spend my money on brakes and
suspension, subframe connectors, intake, exhaust, a shifter (yes,
everyone who has had a fox or current chassis mustang will eventually
put in a new shifter, better now than like me - side of the road, crawl
to town, buy one in the morning), then other things that can make big hp.

send your pulleys back if you can unless you like the cosmetics.

Andrew

Jim Dunn wrote: