Under Pulley

[edevlin]

"I can swap one in about 40 minutes start to finish, on a test car in about 25 minutes with the engine hot on the dyno."


Cool Jake, you could be like, the Jiffy Lube of the Boxster under pulley world. Seriously, when you come up with an under pulley that works well with our cars, I think I would like to have one installed. I will be doing a couple of trips down to Florida this year and your shop looks like it is sorta on the way.

Ed

[Jake Raby]

Its tested up and good to go.. I'd be happy to install one for you.
I am on the way to Florida as long as you are driving South..

Have you found anything to be concerning about this? Particularly, sitting in traffic in a hot climate?

[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..

[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