That's a very worthwhile gain! How hard was the installation? Did you do it yourself? Were any special tools involved? How is this underdrive pulley different from the one supplied by Mantis?

Thanks for the posting! :cheers:

 

I had BBI install mine, but I know someone who has installed their own pulley. It needs a special tool that is included as well as the crank pulley bolt for about $250. Keeps the power-steering cooler and ads some HP.

 

Anybody have the tools for the underdrive install?

I think I'm gonna do the underdrive next. Now that some before/after dyno data has been posted, this seems like a good value in terms of $/HP, plus it eliminates the power steering problems reported by some trackers. I could save some $ if anybody has a pulley tool that I could borrow. And although I have a 32mm socket left over from my 911 days, I don't relish the hassle of grinding it down so it'll fit in the small space avaialable for the pulley nut. So does anybody have a ground-down 32mm socket I could borrow, and a pulley tool as well? I'm in Northern California and could pick-up and deliver, or I'd pay shipping otherwise.

Thanks in advance!
Fort Felker

 

Oh yes CCC4321 this is on my to-do list. There isn’t a better shop to have it installed at either; our zone 8 is a lucky zone for sure. Luckily others can also acquire his Under-Drive Pulley also directly from BBI (soon to be a sponsor!).

zornet :burnout:

 

Hey Z,
What are you waiting for? get it done. I had my installed from BBI last month. It is relatively cheap for the HP gain. You better get it done by the summer time if you are planning to track frequently.

Ciao,

Chaseman

 

I really can't read these. Can you render a simple explanation?

ThnaX!

 

The under-drive pulley, under drives the accessories ( AC, Power steering , Alternator...) which in turn frees up HP/Torque. The original idea was to help the Power Steering from overheating malfunctioning by slowing down the pump, which has happened to many Caymans that have done DEs and AXs.

 

Have you tried seeing if your alternator can keep up? Fire up the HID's and crank up your BOSE system and turn on your windshield wipers, fogs, and interior lights. Any flickering?

 

G@@D QUESTION! Please Try & Reply!



Please let us know how much your lights dim, you wipers' speed slows and other possible untoward effects on your alternator!

Thank you in Advance

 

There is no flickering or dimming at all. I have been in the rain at night and there were no problems. I have used under-drive pulleys in the past on other cars as well with no issues. Hondas and Acuras

 

BBI vs. Mantissport

Can someone please explain the difference, if any between the BBI and Mantissport under drive pulleys: design, cost, dyno.

Apologies if covered elsewhere -- couldn't find it.

Thanks, Andy

 

Also using the Mantis underdrive pulley. No issues at all.

 

The BBI pulley is cheaper than the other. It comes with the install tool and crank bolt for $250, the other does not, and cost more.
I was told the BBI pulley is better balanced, and fits the belt better.
From what I have seen on my car the BBI made more HP than the other.
The BBI pulley has five equally spaced holes, where the other has two on one side so it makes sense to me that it is not balanced.

 

I was told the BBI pulley is better balanced, and fits the belt better.
From what I have seen on my car the BBI made more HP than the other.
The BBI pulley has five equally spaced holes, where the other has two on one side so it makes sense to me that it is not balanced.

I don't think you can tell solely from where the holes are whether it is balanced or not. If I had to guess, the one with the two holes on one side would be the balanced one and not the one with five equally spaced holes (which would do nothing for balance, but would reduce weight - and it still might be balanced....)

 

Can any one direct me to details about the BBI under drive pulley? Nothing at their web site.
cheers.

 

I've tried multiple emails and phone calls, and I can't get any response from them!!

 

I got some feedback.

The Pulley will come with a holding tool and the new crank bolt. The kits cost is $239.00. For some one who is mechanically inclined, It will take you about 2 hours. The pulley is under driven by 16% and retains the stock belt. On our dyno, we found 7 peek hp and up to 10 mid range hp.

All sounds good. Shall I order? That is the question now...

 

They are coming onboard as a sponsor and sending me a pulley to test.

 

Ok cool KmanS. I ordered one already thanks to this site (curses again). After thinking about it for several days it got the better of me.

So it sounds like we have the same engine mods then except for the Exhaust as I have the full Milltek system.
:beer:

 

The 2 hours was what BBI rep said.

 

Is there a post anywhere that describes how to remove the vertical engine access cover behind the seats? Or is it so trivial that no instructions are needed?

Thanks.

 

Does anyone know if the pulley will fit the 2.7l engine, if not does BBI have any plans on making one for the 2.7 cayman/boxsters?

 

I have had my BBI pulley since August with no problems at all!
Before I had the pulley, I had my power steering system overheat and leak followed by loud noise coming from the pump. I know other CC members that have had similar problems as well and all now have UD-pulleys (BBI & Mantis) and have no problems at all.
The pulley is a great way to save your power steering and get a few extra HP for under $250 worth of parts and an hour to two of labor depending if you are a do-it yourselfer or you have someone install it. I have used UD-Pulleys on other cars just for the HP gains and have never had any problems. (Honda & Acura)
The PCA and POC have also approved its use in Street stock and above classes without penalty, because it helps with the reliability of the power steering at DEs.

 

Seems like a mandatory mod if you track the car. I just had power steering problems, fortunately covered under warranty, no doubt a result of 20 track days so far this year. I have the Mantis pulley installed now and hope that improves the reliability. Seems a bit peppier too, a little boneus.

 

Not yet, Im still waiting on the shipment to come from from my buddy who has it. I'll post back when I have something to report.

 

Pulley Pictures

I stopped by BBI and got a couple of pictures of the pulley with my phone.

 

Got mine installed a week ago by BBI. Took about 45 minutes and no issues at all!
Have a Dyno session soon and will be able to show clean results for the pulley

:cheers:

 

I just got mine and its going for an install next week and dyno.

 

Since I am delayed at least a day on this, did anyone get theirs installed and get some dyno runs?

 

Had Dyno session scheduled for today, but GT Pro had to finish another project first, so hopefully tomorrow...

 

Im going to install and dyno in 2 hours time.

 

very interested in seeing these dynos...i had a set on my bimmer, and it made a noticeable difference on the butt dyno. I would pull the trigger on this asap if the numbers are verified.