Underdrive pulley??
Thread Starter
Instructor
Joined: Aug 2005
Posts: 146
Likes: 0
From: oceanside N.Y.
Underdrive pulley??
Considering a underdrive pulley for my C6 auto..was wondering if anyone has one installed and if everything still works up to specs.I have my battery in the rear compartment so i was wondering about the charging process ....any info would be appreciated.Thanks ....NastyC6
Racer
Joined: Jul 2007
Posts: 276
Likes: 0
From: Lynchburg VA
St. Jude Donor '11
Considering a underdrive pulley for my C6 auto..was wondering if anyone has one installed and if everything still works up to specs.I have my battery in the rear compartment so i was wondering about the charging process ....any info would be appreciated.Thanks ....NastyC6
Le Mans Master
Joined: Oct 1999
Posts: 8,205
Likes: 40
From: Tucson AZ
Why? Do you think you will release more power? I ask, because I did this a few years ago and it was a total waste of time and money, PLUS it resulted in battery charging problems. Very little use for a street car, but if you are doing a total re-work for the track, that might be different. 
Advanced
Joined: Aug 2005
Posts: 76
Likes: 0
were you doing a cam as well? I ask because most cam's will need your idle raised which would counteract the loss in output in the charging system at the stocl idle. If not I belive there is another pulley for your altinator that you can get to keep things working at stock idle.
Thread Starter
Instructor
Joined: Aug 2005
Posts: 146
Likes: 0
From: oceanside N.Y.
I have been reading some tech articles which state that underdriving does in fact free up horsepower .From the factory accessories are greatly overdriven .so 25% reduction can still keep all accessories functioning properly......Just wanted to know if anyone had any input......thanks for your response.NastyC6
Thread Starter
Instructor
Joined: Aug 2005
Posts: 146
Likes: 0
From: oceanside N.Y.
Why? Do you think you will release more power? I ask, because I did this a few years ago and it was a total waste of time and money, PLUS it resulted in battery charging problems. Very little use for a street car, but if you are doing a total re-work for the track, that might be different.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
I have had it on all my cars and have never seen any issues with charging. If you do just raise the idle to 700. If you need help with that, shoot me a PM.....Im in NY.
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Racer
Joined: Mar 2006
Posts: 464
Likes: 2
From: Dallas TX
St. Jude Donor '12, '14-'15, '17, '20
Any recommendations for the underdrive pulley? I have seen ASP or SLP, any others? I would imagine they are very similar. I am looking for a good deal on a pulley with belt. Which vendor did you use? Thanks.
Drifting
Joined: Jun 2003
Posts: 1,748
Likes: 0
From: CA
I've had an underdrive pulley on both c5's and now my head/cam c6 with no adverse issues at all. It has been shown to free up 5-10hp across the board so it's worth the cost, especially if you are doing something like a cam install where the pulley has to come off anyway.
Racer
Joined: Jul 2007
Posts: 276
Likes: 0
From: Lynchburg VA
St. Jude Donor '11
http://www.texas-speed.com/shop/item...d=629&catid=20
This is what I have on my car.
Now my tuner said he did not remember seeing the belt in the box from Texas Speed and Texas Speed showed they shipped it. So it did get screwed out of a belt. I would not recommend them unless you are shipping it straight to your home where you can immediately open the box and file a claim with UPS if everything did not arrive. I do not think you will find a better deal and I really looked!
HOOK-EM HORNS
Joined: Aug 2006
Posts: 3,517
Likes: 842
From: Port Aransas, Texas Tx
St. Jude Donor '08
LG installed one when they did my cam and I have had no problems and they are proven to add 6 to 8 HP. If they didn't work the major tuner's, shops etc would stop selling them. It's cheap HP for the buck.
Melting Slicks
Joined: May 2005
Posts: 2,231
Likes: 0
From: Brownsville Tx
I also got mine from Texas Speed. They did ship the belt and bolt, everything came in just fine. I've bought a few things from them before and never had a problem. You will need to raise the idle as previously stated, but you wont have any problems.
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
Thread Starter
Instructor
Joined: Aug 2005
Posts: 146
Likes: 0
From: oceanside N.Y.
Thanks to all the forum members who have replied..I did get it and having it installed as we speak......seems to be cheap HP...May run the car a few more times at Etown this year..every little bit helps........thanks again
