986 Forum - The Community for Porsche Boxster & Cayman Owners

986 Forum - The Community for Porsche Boxster & Cayman Owners (http://986forum.com/forums/index.php)
-   Performance and Technical Chat (http://986forum.com/forums/forumdisplay.php?f=11)
-   -   G/B for Underdrive pulley on CaymanClub (http://986forum.com/forums/showthread.php?t=15016)

jderiansf 01-11-2008 01:20 PM

G/B for Underdrive pulley on CaymanClub
 
Just passing on what looks to be a decent deal on a bbi underdrive pulley kit on Cayman club.

http://www.caymanclub.net/cayman-chat/18986-bbi-under-drive-pulley-group-buy.html

I have no commercial interest etc. Participate at your own risk etc.


Looks to be for 987 and 996, 997 I'm not sure about 986's

Jason

CJ_Boxster 01-11-2008 02:01 PM

I think there site is down, doesnt even come up with just the index page only and no path after ".com"

jderiansf 01-11-2008 02:34 PM

try .net
 
the homepage is at caymenclub.net

I just tried the link, and can't get it to go through either. All I did was copy the http.

I'll try again in a little bit.

Jason

jderiansf 01-11-2008 03:29 PM

yup
 
the site is currently down :confused:

Jason

Gary in BR 01-11-2008 06:08 PM

Do they make a underdrive pulley for the 2.5?

I have never seen one for sale or tested on this engine?
Does anyone know??

If there is one made have you seen a dyno?

jderiansf 01-11-2008 08:31 PM

Quote:

Originally Posted by Gary in BR
Do they make a underdrive pulley for the 2.5?

I have never seen one for sale or tested on this engine?
Does anyone know??

If there is one made have you seen a dyno?


Afaik, it will work.

Before the site went down, there was a post about it being available (or compatible) with a 986.

Most h.p. figures were in the 12 to 15 at the wheels. Its underdriven by 16%

The main reason for 987's to change it is to slow down the power steering pump, to avoid overheating the p.s. fluid during extensive track time.

Jason

Gary in BR 01-11-2008 09:02 PM

I tried an internet search to find the underdrive pulleys manufactures website but i could not find anything.

Does anyone have a link?

idheaton 01-12-2008 08:10 AM

here you go....


http://www.bbiautosport.com/

Gary in BR 01-12-2008 08:41 AM

BBI has a nice looking site but I did not see anything about the underdrive pulleys.

I must have in my back up brain.

jderiansf 01-12-2008 12:27 PM

I think its new
 
Its a new product, and I don't think the site has been updated yet.

Jason

JP-s-in st. louis 01-14-2008 07:49 PM

Quote:

Originally Posted by Gary in BR
BBI has a nice looking site but I did not see anything about the underdrive pulleys.

I must have in my back up brain.


Gary....Be Careful! The underdrive pully IIRC will give you more boost and if you are already at 6SI that may put you over the top. I will check with IA on my kit tomorrow

Gary in BR 01-14-2008 08:04 PM

The pulley will effect the boost on the turbos??

JP-s-in st. louis 01-14-2008 08:08 PM

No never mind just theSC unless the turbos are running on a belt system..... I honestly do not know much about the systm you are running. i would check with your guy first though on that.

Also have you done the plenum yet?

Gary in BR 01-14-2008 08:18 PM

OH Yes, I would check with the turbo supplier first.
I am not into blowing anything up. I sent the shop an email today to see if they make these for the 2.5 and what sort of underdrive the pulley creates.

Ive looked around and can not seem to find the plenum for the 2.5

Do you know of a place that makes them. I dont think RSS is making them for my engine yet.

blinkwatt 01-14-2008 08:42 PM

I'd be skeptical about buying from BBI.

I sent them an email about the compatibility with the 3.2L 986 S and the response was;

Thank you for your interest in our under-drive pulley,

It will work on your 986 boxter great.


I don't want any products in my car that were made by people who don't know how to properly spell my car.

They've had great reviews on the caymanclub forum though.

JP-s-in st. louis 01-14-2008 09:03 PM

You know, the sad part is that we see Boxster spelled incorrectly so many times I almost did not catch it.

NickCats 01-15-2008 10:17 AM

Quote:

Originally Posted by Gary in BR
OH Yes, I would check with the turbo supplier first.
I am not into blowing anything up. I sent the shop an email today to see if they make these for the 2.5 and what sort of underdrive the pulley creates.

Ive looked around and can not seem to find the plenum for the 2.5

Do you know of a place that makes them. I dont think RSS is making them for my engine yet.

Gary,

Plenum for 2.5 :

http://www.************************************************************/productpage.aspx?pid=110901&cid=11&sid=51

Nick

Gary in BR 01-15-2008 10:56 AM

Thanks,

I will look in to what it can do for my car.

CJ_Boxster 01-15-2008 11:06 AM

Isnt the Crank pulley on the boxster as far as function, the same as other vehicles?

What i mean is usually the Crank Pulley turns belts which we all know, HOWEVER it also is a harmonic balancer for the crank... with my experience with bolt on mods on other vehicles, removing your Crank pulley/Harmonic Balancer will throw off some balance that the crank needs in order to prevent premature bearing failure... and by removing the Stock pulley and installing a lightweight Crank Pulley (which commonly do not have harmonic balancer atributes) can reduce the life of the bearings.


I would recommend performing an oil analysis before and after installing the new lightweight Crank Pulley to check for increased wear in the Crankshaft bearings.

cheetah 02-15-2008 10:03 AM

On many cars the crank pulley is a harmonic balancer also, but not on the Boxster. The stock piece is a very lightweight item, and only used to turn the accessories. My custom-made one has been on my car without any problems, and can be seen here:

http://www.cheetahonline.com/products/n8039.html

This is a 20% reduction, has been tested, and it works great. A noticeable increase in power throughout the powerband. The voltage has been tested with all the accessories on during idle for extended time without any drop in voltage.

This also takes 2/3 the power to turn the pulley, as it was made as lightweight as possible. I have not been able to dyno it yet, but I hope to soon.

Paul



Quote:

Originally Posted by CJ_Boxster
Isnt the Crank pulley on the boxster as far as function, the same as other vehicles?

What i mean is usually the Crank Pulley turns belts which we all know, HOWEVER it also is a harmonic balancer for the crank... with my experience with bolt on mods on other vehicles, removing your Crank pulley/Harmonic Balancer will throw off some balance that the crank needs in order to prevent premature bearing failure... and by removing the Stock pulley and installing a lightweight Crank Pulley (which commonly do not have harmonic balancer atributes) can reduce the life of the bearings.


I would recommend performing an oil analysis before and after installing the new lightweight Crank Pulley to check for increased wear in the Crankshaft bearings.



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