Under Pulley

[Jake Raby]

Nothing.. My Wife drove the 911 in July and August in traffic every afternoon and at low speeds with no issues. Those two months in Georgia are brutally hot, every day well over 90F.

That was with the A/C running continually.... While running the headlights as well.
Datalogged battery voltage was over 13.6volts all the time..

Battery voltage and charging at low speeds with the A/C on and running headlights was my biggest concern.

It's proven.

[Johnny Danger]

I had BBI's newest, light weight under drive pulley installed about a week ago. Unfortunately, because it coincided with the installation of a new set of headers and cats, it was difficult to discern what portion of the noticeable power increase could be attributed to the pulley alone. However, for what its worth, I can say that the part appeared to be beautifully made, and the installation was pretty simple and straightforward. Another thing worth mentioning, some astute members from the Planet Porsche site recommended that I should use a shorter drive belt to accommodate for the smaller pulley. They were indeed correct.

[Bob O]

Johnny, Can you tell us what year Boxster and what length belt you used? Did you get it from the dealer? Needing a shorter belt is my concern too and I'd like to have all the "goods" on hand when I do the change.

Thanks

Bob

[Jake Raby]

Mine comes with the belt.. :-)
Its not a "Dealer" item..

[Bob O]

Jake: I've been trying to get onto your site all day. Seems your parts section is DOA for the moment.

Bob

[Jake Raby]

Originally Posted by Bob O

Jake: I've been trying to get onto your site all day. Seems your parts section is DOA for the moment.

Bob

Our server has had issues all week.. And my site has been bombarded with Excellence Magazine readers that saw the reference to our IMS development in the mag this month..

Sorry, it should be back up in a day or so..

[Cartel]

Originally Posted by Jake Raby

Mine comes with the belt.. :-)
Its not a "Dealer" item..

If I missed the memo, many a apologies before hand but when is your UDP set to be released?

[chaudanova]

The UDP doesn't require removal of the AC does it? Perhaps I am mistaken, but I read some other posts in the past about people that removed their AC also, and wasn't sure if that was a requirement for running the UDP... Please clarify...

[Topless]

Originally Posted by chaudanova

The UDP doesn't require removal of the AC does it? Perhaps I am mistaken, but I read some other posts in the past about people that removed their AC also, and wasn't sure if that was a requirement for running the UDP... Please clarify...

Nope. You simply replace the main drive pulley with a smaller one to slow down all the accessories. The guys removing the A/C pump are removing weight and setting up a race car. My car is still a street car and I like my A/C.

[Johnny Danger]

Originally Posted by Bob O

Johnny, Can you tell us what year Boxster and what length belt you used? Did you get it from the dealer? Needing a shorter belt is my concern too and I'd like to have all the "goods" on hand when I do the change.

Thanks

Bob

Bob,

It is my understanding that both the 986 and the 987 boxster all use the same size belt. With that said, after calculating the difference in circumference size between the two pulleys, the conclusion was that a belt which was 31 mm shorter than the stock one was the ideal choice. Therefore, the Gates #k060820 was determined to be the best choice.

Johnny

[Bob O]

Thank you for the info Johnny

Bob