Making an Alternator Underdrive Pulley for my GT350

[@young11984]

Honestly with that amount of RPM and sudden engine speed changes i can see the one way being useful with that heavy steel pulley, with the aluminum one and good belt grip it may not be needed but the tensioner will let you know on a solid pulley kind of quick imo. That was a design to save belts and tensioners with todays high rpm engines especially with the few manuals, DCTs and paddle shifted autos that like to eat belts and snap tensioners/bolts on rapid down shifts

[@ajhartmanaero]

I agree. Definitely worth exploring tho. I’m sure reducing pulley mass by 70+% and reducing alternator speed by 25% that those issues have to be lessened. I’m not sure by how much at this moment but I’ll find out.

[@Garagegraderacecar]

so jealous off the toys!

[@cornercarverfan]

Well done AJ!

[@TurbineResearch]

Super awesome 👏 love watching you go through the process

[@SpyderRacing]

Great video!

[@ben94cobra]

same issue w/ a customer's 2JZ. Would shoot up to 16v and let all the smoke out, it had the incorrect pulleys and was turning too high RPM.

[@Section501K]

Nice and awesome new shop machine

[@evilluzion]

I've gone through 2 alternators now (always fail at the track which sucks) and would absolutely be interested in this.

[@michaelblacktree]

That's awesome! Wish I could do stuff like that. 👍 Just FYI, the one-way pulley also reduces stress on the belt tensioner. So if you use a solid pulley, the lifespan of the tensioner may be reduced. Not sure by how much, but it's something to keep in mind.

[@ajhartmanaero]

Agreed but reducing pulley mass by 70% and speed by 25% I’m sure those effects are lessened. By how much I’m not sure. But I’d rather go through tensioners and $15 belts than $300 alternators. I’ll do a follow up video when I get to test them.

[@michaelblacktree]

That's a good point.

[@vx220ukct]

Nice work. Looked really nice in the end.

[@eimarshall]

Always a great explanation video! What are you doing to that 6th gen Camaro? Asking for a friend…..

[@ajhartmanaero]

Splitter kit, wing kit, and canards

[@eimarshall]

​​@@ajhartmanaero Awesome!! I've used a ton of your videos as reference to building my own splitter for my Camaro, and I'm just starting to play with CF.(You make it look so easy!) I can't wait to see what a real professional can do!

[@angadbhalla3841]

Can you please tell me what material the flow net is made from?

[@dcaron9999]

I have fried an alternator at the Watkins Glen track last weekend, likely due to running high RPMs. The car is still under warranty so getting the alternator replaced this week. To avoid this from happening again, I want to purchase a 3 or 3.5 inch underdrive pulley, following in your footsteps. Are you making and selling these now? Would the pulley work on a Ford Coyote engine?. My car is a 2022 Ford Mustang Mach1. It revs up to 7500 RPM stock. Thanks.

[@ajhartmanaero]

@@dcaron9999 should be getting to them soon so keep an eye out.

[@RLCPLUMBINGLLC]

I will buy one for my 350 and test it with out the smart bearing.

[@ajhartmanaero]

I’m working on a fixed option and a version with clutch bearings I was able to find.

[@brucemiddleton6697]

this is crazy. My GT350 just started giving the charging system error message last night. this may be my next purchase!!!

[@lobuk516]

i went through a similar thing with my car. the underdrive seems to keep it alive.