Carl Fausett

Just a note to let all of you know we are now stocking our upgraded alternators for the 928.

They used to have a 3-4 week lead-time on them, but I have made the decision to carry them in inventory so now they can ship next day. I have both the 150 amp model and the 200 amp model in stock, for both early and late 928s.

The 150 Amp model is the most popular, especially because it will charge even at a slow idle, and the 200 amp model is popular with the big stereo crowd.

You wouldn't believe how a good alternator changes the whole car. Electric windows, seats, ignition, defrosters, fans, - all work better!

Our price includes the all-new alternator, the custom mounting brackets, and instructions. Everything you need.

More information available here:
http://www.928motorsports.com/parts/alternators.php

RFJ

Hey Carl, that engine needs a clean up!

DKWalser

Carl -- Could you clarify something? Your website (linked above) says your "custom 928 alternator mounts up to the stock 928 brackets without modification...." Above, you say it comes with "custom mounting brackets". Which is it? I suppose to most buyers it won't make a difference whether a custom mounting bracket is used or not, but those of us who will do the work ourselves might want to know how much work might be involved in the switch.

Crumpler

Hey Carl, I've always worried about the heat issues with alternators, at least ours anyway. These upgrades don't need a shroud or air duct?
Can you tell us more, I'm not a big stereo guy, but I'm running all electric cooling fans on the S3 and you can certainly tell when it kicks on. Thanks.

Carl Fausett

I see how that could be confusing. Actually, both statements are true. We supply custom mounting brackets so that there are no modifications needed to your car. So, yes, it does "mount up to your (stock) mounting brackets without modification".

Here are some pics of the 32v install that will help explain.

Carl Fausett

The cooling of the stock alternator is back-to-front. That is, the cool air enters at the rear of the alternator and is drawn to the front by the fan. This means: the air flow through the alternator has to go against the air flow coming out of the radiator, and that the plastic shield is needed with the hose to get cool air to the rear of the alternator where it enters. In case you are wondering, they did this to provide the greatest cooling for the rectifier electronics, which is on the back of their alternator.

The cooling flow of our alternator is both ends toward the middle. Air enters both at the rear and at the front, and is thrown out at the sides, laterally. Much shorter air path, better cooling, and no need for the plastic air inlet cup.

Alternators are affected by temperature - the hotter they get the less they produce. So much so that the S.A.E. has published specs on how they are to be bench-tested, and all alternator ratings are supposed to represent their output at 23 °C ± 5 °C (73.4 deg F). Going to a 150 AMP alternator gives you a very comfortable margin even when hot, as it produces about 130 AMPS hot. Our measurements of the factory 115 AMP alternator in hot engine bay showed us that it maxes out at about 92 AMPS output.

Chris Hansen

I purchased one of these a couple of weeks ago, and can report that it does appear to have solved my low voltage problems at idle. I had installed a rebuilt original unit about 6 years ago, which quit charging after about 20,000 miles. So far, I'm very happy with Carl's upgraded alternator.

I will point out that for the 16v motors, you will need a custom adjustment bracket that Carl provides so that you can get proper tension on the belt. Installation was very easy.

Crumpler

I ordered one yesterday, I will post after the 32V install, hoping just as easy....

Petza914

I have one of the 200 Amp versions on my 16v, along with Carl's Z06 trans. Because of the taller gear ratios, I'm only turning 2,000 RPM at 85 MPH and because of that,p would recommend that anyone with the 6-speed trans select the 150 Amp version unless you drive around at 100 MPH or don't want to use 6th gear. I had selected and installed the 200 Amp unit when I was planning to keep the original 5-speed, and didn't think about changing it when deciding to move forward with the 6-speed upgrade, but may change to the 150 Amo version at some point in the future to get better low rpm charging.