no164ford
Registered User
A few things I have learned about my 6G alternators. I have no proof to back these results but this is what happened to me.
1st one I put on was from a 2001 Mustang V6 factory Motorcraft with stock 2"ish SC pulley on it worked great 14v at Idle on the dyno up to 6000 rpms lowest was 12.8ish. First time I road tested took the car up to 6650 rpm 2 times alternator fried. I figured no surprise it was a u-pull special
So I ordered a new upgraded one 130A NEW not rebuilt.
2nd one Put it on the car stock SC 2"ish pulley took it for a test run car going way lean 13.2's AFR at 5800 did a data log found that at 5200 rpms my voltage dropped from 13.5ish to 11.25 by 5400 rpms the car quit charging and my maf voltage started to drop from 4.12 down to 4.06 making the car go lean. As soon as the rpms came back down the car would start charging, I data logged this 5-6 times to verify.
After talking to Dave Dalke about China made voltage regulators (in the new alt) and possibly over driving the 6G alternator I went back to the u-pull picked up 2 more 6G alternators from 2000 and a 2001 v6 Mustang both factory Motorcraft.
3rd one I installed, one of the u-pull alternators but instead of using the SC pulley I used the larger 2 1/2"ish Mustang 6 rib pulley to slow down the rpms took the car for a test data logged 3-4 pulls up to 6600 rpms voltage held at 13.0ish and 14.0ish at idle, This is great because I have tried at leased 6 stock SC alternators and never could get more then 11.7 volts after 6000 rpms.
Like I said I have no proof but I wanted to post my results so someone don't destroy there motor because they changed there alternator.
1st one I put on was from a 2001 Mustang V6 factory Motorcraft with stock 2"ish SC pulley on it worked great 14v at Idle on the dyno up to 6000 rpms lowest was 12.8ish. First time I road tested took the car up to 6650 rpm 2 times alternator fried. I figured no surprise it was a u-pull special
So I ordered a new upgraded one 130A NEW not rebuilt.
2nd one Put it on the car stock SC 2"ish pulley took it for a test run car going way lean 13.2's AFR at 5800 did a data log found that at 5200 rpms my voltage dropped from 13.5ish to 11.25 by 5400 rpms the car quit charging and my maf voltage started to drop from 4.12 down to 4.06 making the car go lean. As soon as the rpms came back down the car would start charging, I data logged this 5-6 times to verify.
After talking to Dave Dalke about China made voltage regulators (in the new alt) and possibly over driving the 6G alternator I went back to the u-pull picked up 2 more 6G alternators from 2000 and a 2001 v6 Mustang both factory Motorcraft.
3rd one I installed, one of the u-pull alternators but instead of using the SC pulley I used the larger 2 1/2"ish Mustang 6 rib pulley to slow down the rpms took the car for a test data logged 3-4 pulls up to 6600 rpms voltage held at 13.0ish and 14.0ish at idle, This is great because I have tried at leased 6 stock SC alternators and never could get more then 11.7 volts after 6000 rpms.
Like I said I have no proof but I wanted to post my results so someone don't destroy there motor because they changed there alternator.