JOHN_DEERE_LS6

iTrader: (10)

bbk offers 2 underdrive pulleys... a ls1 fbody sfi or a 97-04 vette sfi, both for ls1's, the ls6 in my car can use a pulley for a ls1 correct?... id assume i need the vette one but i figured id ask you gents first....

also where can i get it the cheapest?

thanks in advance

jordan

raven154

iTrader: (14)

Yes the dampener for the LS1 y-body (vette) is the one you will need. Dont know the best place to get them.

JOHN_DEERE_LS6

iTrader: (10)

thanks

Scoggin Dickey

iTrader: (34)

We sell the underdrives, we can probably get you a pretty good price

JOHN_DEERE_LS6

iTrader: (10)

quote me a price sir!

trukk

iTrader: (1)

I have an ATI for the vette on my LS6 car. Definately get a good balancer if you are going to go this route, it's important. I wouldn't get anything but an ATI.

-Chris

SkullV

iTrader: (11)

Chris did you ever find out if the pully was what was causing your power steering problem?

JOHN_DEERE_LS6

iTrader: (10)

so i have to buy a pulley and a balancer to do this??? where did you get your setup you have and how much and also do you have part numbers?

will this cause powersteering issues?

trukk

iTrader: (1)

The UD Pulley and UD Harmonic balancer are the same thing, so you just have to get one.

I've had my 25% UD Harmonic Balancer on for about 40K miles, which is probabaly one of the longer ammounts of time on a CTS-V specifically. Looking at the accessory system, the HB spins the waterpump, alternator and PS pump. The seocondary belt spins the AC compressor, however it is not under driven. With that said, I have had no heat issues with the waterpump being underdriven, so far so good there. I did have my PS pump go out last summer, however upon inspection it was a hose that went bad and not the pump itself, so I don't think underdriving the PS pump is an issue.

I have gone through 2 alternators since puttin on the UD Balancer however. The first one went out a day after the PS pump went out, and I believe it was due to it being sprayed with all the PS fluid when that went bad. [It actually went dead while I was on the track, and then I lost power, and the computer rebooted while I was about to brake at 135 (WHOOPS!). Major pucker factor seeing 'SYSTEM REBOOTING' on the DIC. Lost ABS, went off track, no problems though.] The second alternator went out last winter. BIll @ Lindsay indicated that the wiring looked fried inside the alternator. At this point I am unsure why this happened. The alternator on the CTS-V apparantly is 'smart' and has some connection to the PCM. Perhaps by under driving it, it causes it to work too hard, shortening it's life? At this point I'm not sure. I am playing it by ear. So far 10k miles on the new alternator. If it goes south again, I'm pretty sure it's the UD Balancer that is causing it. If so, there are two options; either remove it (or go to a 10%), or get a smaller pulley on the alternator. East Coast Supercharging may have something (or not), I haven't checked. We may be bit by the CTS-V, no aftermarket bug there.

Anyway, If I have another issue, I'll let everyone know. At this point, the only advice I have is, to make sure you get a good balancer (like an ATI), as it is there for a reason (to absorb virbrations and harmonics from the crank). Also make sure you get an ARP crank bolt, as the OEM GM ones are tourque to yield and can only be used once. Plus the ARP on just oozes quality, and the OEM GM one looks like a galvanized deck screw:



Here is the belt I used for the 25% under drive (AC belt stays the same):


-Chris

CTSV_510

iTrader: (1)

Holy huge pics trukk.

CTSV_510

iTrader: (1)

where is the best place to get a 10% overdrive balancer (8")?

trukk

iTrader: (1)

Too lazy to resize. You can definately tell the difference in the quality, and you can even read the part number

-Chris

maxspeed96ct

iTrader: (3)

Does a underdrive pulley even gain any hp on our motors?

Cause i know the usualy dont give much for gains but im not sure about the ls6 ...

Scoggin Dickey

iTrader: (34)

7-10rwhp average

SkullV

iTrader: (11)

Make sure to do a crank relearn too! Anytime you change the rotational mass on the crank you are supposed to do one!

alan2000T/A

iTrader: (23)

bringing up an old thread...but what is crank relearn???

supergeess

iTrader: (1)

How do you do a crank relearn?

SkullV

iTrader: (11)

Easiest way is with a Tech2 but there is a process on cadillacfaq.com

JonCR96Z

iTrader: (33)

Crank relearn is more or less just to sync the crank and cam position sensors. Only needed if you swap PCMs or have the sensor out.

vmapper

iTrader: (8)

Do these overdrive pulleys not fit?
http://www.rpmoutlet.com/c5stat.htm#2

I always run a 12%(net) over alt when using -25% crank.