Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

Underdrive Pulley Owners???

Thread Tools
 
Search this Thread
 
Old 01-10-2007, 06:02 PM
  #1  
TECH Enthusiast
Thread Starter
iTrader: (16)
 
Brads LS1 02Z's Avatar
 
Join Date: Aug 2006
Location: NC
Posts: 699
Likes: 0
Received 0 Likes on 0 Posts

Default Underdrive Pulley Owners???

Ok this is pretty much the last bolt on that I could think of but dont know much about them... so....

Do they cause any problems?

Does the stock alt pulley work well enought or is the overdrive pulley needed?

What brands would you recomend?

Could you tell a difference?

Does anyone have a before and after dyno graph after swaping one out?

Was it worth your time? (probably still get one though if you did not care for it)
Old 01-10-2007, 06:14 PM
  #2  
TECH Senior Member
iTrader: (9)
 
Tainted's Avatar
 
Join Date: Mar 2006
Location: Indianapolis
Posts: 8,425
Likes: 0
Received 2 Likes on 2 Posts
Default

I dont have them yet but I plan on it.

1.) No unless you have an A4 car and udnerdrive the alt then you may have charging issues
2.) it should be fine but you can get the voerdrive if you want
3.) ASP or SLP
4.) People say its a little gain not much but can help rev quicker
5.) normally like 5-10ish hp
6.) its a quick 30 min mod so either way its a quick last thing to do bolt on
Old 01-10-2007, 06:17 PM
  #3  
TECH Enthusiast
 
00454sscamaro's Avatar
 
Join Date: May 2006
Location: south jersey
Posts: 644
Likes: 0
Received 0 Likes on 0 Posts
Default

wasnt worth it to me but might be because i did the electric water pump first, and it free'd up alot. didnt notice the ud pulley, but might rev faster..

have fun on the install might be a pita depending on how good your pulley bolts tightened.
Old 01-10-2007, 06:21 PM
  #4  
Moderator
iTrader: (4)
 
davered00ss's Avatar
 
Join Date: Nov 2003
Location: Plainfield, CT
Posts: 10,520
Likes: 0
Received 0 Likes on 0 Posts

Default

1. No issues
2. No problems
3. Stock alt pully is fine unless you have a big stereo system
4. March, Powerbond or SLP. Avoid the ASP they had belt slippage issues.
5. No seat of pants difference. Dyno showed increase.
6. Gained 12rwhp & 12rwtq (last mod added) already had cam in.
7. Defenitly a worthwhile and worth the $ mod.
Old 01-10-2007, 06:50 PM
  #5  
12 Second Club
 
02TaOwner's Avatar
 
Join Date: Apr 2005
Location: Odessa, Tx
Posts: 54
Likes: 0
Received 0 Likes on 0 Posts
Default

I have the ASP with no problems of it slipping off, even on the nitrous it hasn't come off. 6,000 miles on the pulley so far. I haven't noticed any charging problems as mentioned above, maybe I got lucky.
Old 01-10-2007, 07:06 PM
  #6  
TECH Senior Member
iTrader: (4)
 
ULTIMATEORANGESS's Avatar
 
Join Date: Mar 2003
Location: eatontown,nj
Posts: 10,976
Likes: 0
Received 17 Likes on 15 Posts

Default

i have an ASP. no problem in over 5 yrs. just have your idle turned up.
Old 01-10-2007, 07:49 PM
  #7  
TECH Regular
iTrader: (13)
 
white_camaro's Avatar
 
Join Date: Jul 2005
Location: las vegas, nv
Posts: 468
Likes: 0
Received 3 Likes on 2 Posts

Default

powerbond here. had the idle raised. no problems whatsoever. gained a solid mph and .1 at the track. if a cam is in your near future id wait and do it with the cam. if your not careful you can really **** **** up.
Old 01-10-2007, 08:29 PM
  #8  
10 Second Club
iTrader: (24)
 
chrs1313's Avatar
 
Join Date: Feb 2005
Posts: 5,697
Received 4 Likes on 4 Posts

Default

i have the ASP and it is 25% and i have two amps running and it works fine...only thing i did was bump the idle rpm a little...good mod
Old 01-10-2007, 08:47 PM
  #9  
Teching In
iTrader: (1)
 
Marblehead's Avatar
 
Join Date: Apr 2006
Location: New Bern, NC
Posts: 48
Likes: 0
Received 0 Likes on 0 Posts
Default

Only worth a couple HP on our LS1's. Not worth it for what the pulleys cost.
Old 01-10-2007, 10:25 PM
  #10  
TECH Resident
iTrader: (26)
 
dpw41285's Avatar
 
Join Date: Apr 2006
Location: Ft Wayne, IN
Posts: 969
Likes: 0
Received 0 Likes on 0 Posts
Default

if a couple is a solid 10+ your correct. do it with the cam, slp you cant do a double roller. asp you can.
Old 01-11-2007, 01:20 AM
  #11  
11 Second Club
iTrader: (10)
 
SS4Luck's Avatar
 
Join Date: Feb 2006
Location: Sterling Heights, MI
Posts: 2,215
Likes: 0
Received 2 Likes on 2 Posts

Default

jsut reading through and have a quic question..

why and how did you all bump up the idle??
Old 01-11-2007, 07:14 AM
  #12  
TECH Enthusiast
Thread Starter
iTrader: (16)
 
Brads LS1 02Z's Avatar
 
Join Date: Aug 2006
Location: NC
Posts: 699
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by davered00ss
1. No issues
2. No problems
3. Stock alt pully is fine unless you have a big stereo system
4. March, Powerbond or SLP. Avoid the ASP they had belt slippage issues.
5. No seat of pants difference. Dyno showed increase.
6. Gained 12rwhp & 12rwtq (last mod added) already had cam in.
7. Defenitly a worthwhile and worth the $ mod.
So far im leaning towards the SLP or ASP... but where did u hear that the ASP had belt slippage issues?
Old 01-11-2007, 07:15 AM
  #13  
TECH Enthusiast
Thread Starter
iTrader: (16)
 
Brads LS1 02Z's Avatar
 
Join Date: Aug 2006
Location: NC
Posts: 699
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by dpw41285
if a couple is a solid 10+ your correct. do it with the cam, slp you cant do a double roller. asp you can.
so y cant u have a double roller with the SLP?
Old 01-11-2007, 08:48 AM
  #14  
11 Second Club
iTrader: (5)
 
warp10's Avatar
 
Join Date: Mar 2006
Location: Caledon East, ON
Posts: 380
Likes: 0
Received 0 Likes on 0 Posts

Default

I have the ASP and it works well. If you are worry of belt slippage, you can use a shorter serpentine belt then recommeded. Looks like it works for the others.
Old 01-11-2007, 09:07 AM
  #15  
TECH Fanatic
iTrader: (4)
 
Smokin00WS6's Avatar
 
Join Date: Dec 2003
Location: Pennsylvania
Posts: 1,080
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by SS4Luck
jsut reading through and have a quic question..

why and how did you all bump up the idle??
On say a program like EFI live or LS1 edit. It works nice. I turned my idle up to 1000rpm.
Old 01-11-2007, 09:29 AM
  #16  
TECH Regular
iTrader: (4)
 
The SSheriff's Avatar
 
Join Date: Oct 2006
Location: The Plywood State
Posts: 492
Likes: 0
Received 0 Likes on 0 Posts
Default

ASP is a great product, and I have to say that the car does rev a little faster, and just like the other members said, it doesn't add to the "throw-back-in-your-seat" factor. My belt has never slipped, and I have had ZERO problems with it.

Good luck!
Old 01-11-2007, 09:51 AM
  #17  
Launching!
iTrader: (11)
 
m6speed's Avatar
 
Join Date: Nov 2005
Location: Maryville, IL
Posts: 264
Likes: 0
Received 0 Likes on 0 Posts

Default

asp belt slippage issues were from the old models from a year or two back i believe, the new ones don't have this problem
Old 01-11-2007, 10:05 AM
  #18  
Banned
iTrader: (45)
 
lsx24's Avatar
 
Join Date: Aug 2003
Location: NC
Posts: 2,556
Likes: 0
Received 0 Likes on 0 Posts
Default

>> Do they cause any problems?
Not usually, only with cars with high-power stereo systems, or other electrical draw.

>> Does the stock alt pulley work well enought or is the overdrive pulley needed?
Overdrive alt pulley only needed if you have a large aftermarket stereo system. For a stock system it isn't.

>> What brands would you recomend?
ASP, March, Powerbond, SLP are all popular brands. Personally I used the ASP without trouble, but I heard the powerbond/SLP is just as good.

>> Could you tell a difference?
Not by itself, but it makes a difference in the long run, with all the other mods it adds up.

>> Does anyone have a before and after dyno graph after swaping one out?
At home I have a graph, iirc it showed a gain of 10 rwhp 10 rwtq, I can post it later.

>> Was it worth your time?
IMO yes. Lots of people do it at the same time as cam, since the stock pulley has to come off anyway, but I did mine as part of full boltons, and I would probably do it again.
Old 01-11-2007, 10:59 AM
  #19  
TECH Regular
iTrader: (4)
 
cwaldt's Avatar
 
Join Date: Jan 2006
Posts: 428
Likes: 0
Received 0 Likes on 0 Posts

Default

Had them on my 94 V-6 Camaro and I could tell a difference with them over the stock pullies. I also had them on my 95 z-28 when it had the LT-1 in it, but I don't know if it made a difference. The reason I don't know that is I never drove the car without them. I put them and a few other mods on it before I ever drove it. I had to do an engine change when I got the car so I put some mods on at that time.

Didn't have any issues with either car. Just had to rev the car sometimes in bumper to bumper traffic to keep the volts up.
Old 01-11-2007, 12:29 PM
  #20  
TECH Resident
iTrader: (26)
 
dpw41285's Avatar
 
Join Date: Apr 2006
Location: Ft Wayne, IN
Posts: 969
Likes: 0
Received 0 Likes on 0 Posts
Default

not positive why you cant use it with a double roller i just remember my buddy pulling a slp one of and i wanted to buy it and he said it wouldnt work because i was gonna run the double...hence the reason he took it off anyways. i trust him 100% asp makes slp pulleys from what i remember



All times are GMT -5. The time now is 03:05 AM.