underdrive
From what I understand they're all pretty much the same.. But I know someone's gonna shoot down that statement.. MTI sells a good one - www.motorsporttech.com
I started building my '01 first and put a SLP on it. It was a very difficult install. For the '99 I went with a ASP. Much easier install. The quality on both is excellent though. Both are doing a great job too. Anyone else had trouble with installing the SLP, or am I the only one who struggled like hell to get it installed?
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any of them.. they all do the same thing.
not to be grammar police or anything, but the stock one isnt an underdrive, it's just the crank pulley. underdrive means it's smaller than the stock one, thus drives the accessories slower, letting the engine put a little more power to the wheels.
not to be grammar police or anything, but the stock one isnt an underdrive, it's just the crank pulley. underdrive means it's smaller than the stock one, thus drives the accessories slower, letting the engine put a little more power to the wheels.
TECH Apprentice
Joined: Sep 2007
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yeah sorry for sayin underdrive i know the diff but anyways i have alot done to mine also just figured i have everything off my front end to do my head and cam i fig i might as well do the pully while it is easy to get to thanks for all the info guys looks like ASP for me
i really want the underdrive pully! but the altenator, power streering and mostly waterpump scare me if these turn slower! my voltage will drop and and my pump would turn slower causing less coolent flow! would it be ok or im i to worried!
don't worry, i have it and you'll be fine. If you have a high power stereo, get the OVER-drive alt pulley when you get the UD pulley.
Administrator
Joined: Nov 2001
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From: Houston, TX
Don't worry, you don't need an ALT pulley or any other pulley for that matter. Just get the crank pulley.
Like I said before I have an ASP crank pulley on both cars, one being a 427. On my 427 I've driven in the rain at night with the rear defroster on with a stereo that has 2 amps. I don't know how anybody would need an ALT pulley unless they have some HUGE *** system in their car.
Peace,
Craig.
Like I said before I have an ASP crank pulley on both cars, one being a 427. On my 427 I've driven in the rain at night with the rear defroster on with a stereo that has 2 amps. I don't know how anybody would need an ALT pulley unless they have some HUGE *** system in their car.
Peace,
Craig.
Don't worry, you don't need an ALT pulley or any other pulley for that matter. Just get the crank pulley.
Like I said before I have an ASP crank pulley on both cars, one being a 427. On my 427 I've driven in the rain at night with the rear defroster on with a stereo that has 2 amps. I don't know how anybody would need an ALT pulley unless they have some HUGE *** system in their car.
Peace,
Craig.
Like I said before I have an ASP crank pulley on both cars, one being a 427. On my 427 I've driven in the rain at night with the rear defroster on with a stereo that has 2 amps. I don't know how anybody would need an ALT pulley unless they have some HUGE *** system in their car.
Peace,
Craig.
TECH Addict
Joined: Nov 2005
Posts: 2,379
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I prefer my alternator to not work as hard, I have the overdrive alternator pulley even though I have a m6. With every light on, a/c and defroster, the voltage doesn't budge unless I drop to 600rpm which can happen sometimes if you release the clutch after revving up a bit or are launching off a hill. Without the overdrive, I think it'd put a bit more stress on the system as a whole.
The underdrive is rated for 25% from stock, so if you idle 900rpm for a stock m6, it'll be like you are idling 675rpm for the accessories. To put that in perspective, an auto car idles around 650rpm stock. That means all your accessories are functioning like they are in an auto car, which they can handle fine.
The underdrive is rated for 25% from stock, so if you idle 900rpm for a stock m6, it'll be like you are idling 675rpm for the accessories. To put that in perspective, an auto car idles around 650rpm stock. That means all your accessories are functioning like they are in an auto car, which they can handle fine.