Which Alternator route?

So I got my car dyno tuned yesterday.
All was good except I was loosing charging above 5500 rpm.
Before 5500 rpm it was around 13.4-13.5 Volts. Then once around 5500 rpm started going down to 11.5 volts.
Tuner said I need to get my alternator fixed and then can do another pull.
He said like I have red here that this is a common problem with these cars and they are over spinning at high rpms. I know the heat kills these alternators too.
My car only has 15K miles on it but I guess I have seen some alternators go sooner than that.
Anyhow I was going to just get a new Ford OM alternator and use the 3.0 metco alt pulley to slow it down a bit. Im still on the stock crank pulley OD.
or just keep the same 2.6 alt pulley with the new alternator.
What are your thoughts?
I don't think I want to do the aftermarket alternators after lots of readings here. Not a guarantee in my opinion.

All the motorcraft ones are remans. I wouldn't suggest putting a larger pulley on the alternator with a stock crank pulley.

You dont think i will have enough charge at idle?

This will clear it up:

http://www.modularfords.com/threads/235857-Terminator-quot-Alternator-101-quot

jrgoffin, is Godmode still rebuilding in the 3g case? Is this the best route to take or just go with local store 6g

BLOWN9646 said:

jrgoffin, is Godmode still rebuilding in the 3g case? Is this the best route to take or just go with local store 6g

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HE WIL STILL DO 3G....HE HAS BEEN RUNNING ONE ON HIS CAR FOR NEARLY A YEAR WITH NO WIRING UPGRADE I BELIEVE AND STILL OK
SEND HIM A PM, HE WILL QUOTE YOU....THEN GET A WIRING UPGRADE FROM JUSTIN WHEELER AND YOURE SET.

This is what I did... https://www.svtperformance.com/forums/threads/attempt-at-a-permanent-alternator-fix.1115584/

New build V6 alt converted to our post and pulley.

BLOWN9646 said:

jrgoffin, is Godmode still rebuilding in the 3g case? Is this the best route to take or just go with local store 6g

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Hopefully the post right below your question answered it, but even though he added that to my thread, I don't have any knowledge of what he does. If it works out, it's a good alternative, but in a pinch, the V-6 alternators are still easy to score.

FortLewisCobra said:

This is what I did... https://www.svtperformance.com/forums/threads/attempt-at-a-permanent-alternator-fix.1115584/

New build V6 alt converted to our post and pulley.

Click to expand...

How is it still holding up with the heat shield and duct?

FortLewisCobra said:

This is what I did... https://www.svtperformance.com/forums/threads/attempt-at-a-permanent-alternator-fix.1115584/

New build V6 alt converted to our post and pulley.

Click to expand...

I did the exact same thing. I haven't put enough miles on to say it was a good fix or not but so far so good.

I'm running a nation's alternator with external regulator. I've only had it on the car for a year. Idle I have it at 14.3-14.7 volts.

Regulator away from heat.

03sonicblu said:

How is it still holding up with the heat shield and duct?

Click to expand...

Still going strong but its only been 2,500 miles so too soon to tell probably.

Mechmen 240 s Series


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I went with Justin Wheeler's 200 amp custom alternator. He's fairly well known on Facebook and I was referred to him from about 7 different people. Installed mine a couple weeks ago and it works beautifully! Will be doing his wire upgrade which I purchased as well when I have a free day

Anyone here run a 3.0 alternator pulley with stock crank and have any problems?

I guess I'm the odd man out. My car had 59k when it went in for blower upgrade and they said my alt was weak so I agreed to go ahead and replace it. They said the OEM one would be fine and it's a high end mustang shop not just some grease monkey store so that's what's on mine. They ordered it from a big Ford dealership right up the road. Just looked and it was $200.87

The metco 3.2 alt pulley is what I changed to to slow things down a bit. I also went with Justin Wheelers 200 amp alt and wiring upgrade and have been amazingly pleased. I've had no drop in voltage since installing these things. I run my a/c and radio and lights and still get into the throttle with zero issues with voltage.

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