ok seriously...what's the deal with lightened pulleys?
Originally Posted by timzcat
Just poor terminology like alternator, WTF is an alternator. 
It's a generator but since they moved the voltage regulator inside people started calling it an alternator.
It's a generator but since they moved the voltage regulator inside people started calling it an alternator.
Evolved Member
Joined: Apr 2004
Posts: 565
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A lightened pully is a nice way 
to free up drag on the motor. There are no adverse effects, only if you go to a underdrive pully is there a problem with the charging system and accessories. I would stay clear of the latter.
to free up drag on the motor. There are no adverse effects, only if you go to a underdrive pully is there a problem with the charging system and accessories. I would stay clear of the latter.
go to to this link, it's a discussion from a few years ago about UR pulleys on DSM's. Some VERY fast people responded. John Shepherd, David Buschur, Marco at Magnus Motorsports, read the whole thing and decide for yourself.
http://www.teamnabr.com/cgi-bin/inde...iew&topic=1730
http://www.teamnabr.com/cgi-bin/inde...iew&topic=1730
that's the damn problem... you read the whole thing and can't decide!!!!
can't someone just make one of these mother****ers right so we can all benefit and not worry about blowing something up. i honestly don't even know what is wrong with the motors that are breakig and how the f a crank pully could do that espeically if its only lightened. f it all
can't someone just make one of these mother****ers right so we can all benefit and not worry about blowing something up. i honestly don't even know what is wrong with the motors that are breakig and how the f a crank pully could do that espeically if its only lightened. f it all
Newbie
Joined: Jan 2005
Posts: 48
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From: Arkansas
31,000 miles of almost all racing, with some street driving mixed in. A complete set of unorthodox racing underdriven pulleys installed when new, including crank pulley. No problems at all. And this is a bigger turbo car driven very hard for very long distances. The A/C still works fine, No belt wear or bearing problems on any accessory. The conventional wisdom out there is often wrong.
But unless you are a serious racer using very high RPM for very extended periods of time, I don't think they are worth the expense. The underdriven pulleys do work well in my application.
So many of the modifications we perform on our Evo's are seen by the owners as just a way of making more horsepower. For the racer so many of the things we do are to control heat. A bigger turbo will push more air, but it will also do it with less heat buildup, a bigger intercooler dissipates heat more efficiently. Underdriven pulleys allow every thing driven by the crank to turn slower, and thus generate less heat. The harder you drive your car the more heat becomes your enemy. Think about it this way and it will help you decide what modifications to spend your money on. Horsepower numbers on a dyno just don't translate to how capable your car really is. Dyno numbers are just an indicator. In the final analysis, isn't you goal to have a car hugely capable in more than one dimension?
EB
But unless you are a serious racer using very high RPM for very extended periods of time, I don't think they are worth the expense. The underdriven pulleys do work well in my application.
So many of the modifications we perform on our Evo's are seen by the owners as just a way of making more horsepower. For the racer so many of the things we do are to control heat. A bigger turbo will push more air, but it will also do it with less heat buildup, a bigger intercooler dissipates heat more efficiently. Underdriven pulleys allow every thing driven by the crank to turn slower, and thus generate less heat. The harder you drive your car the more heat becomes your enemy. Think about it this way and it will help you decide what modifications to spend your money on. Horsepower numbers on a dyno just don't translate to how capable your car really is. Dyno numbers are just an indicator. In the final analysis, isn't you goal to have a car hugely capable in more than one dimension?
EB
I've never had an issue using these pullies on a 1G and 2G DSM's or Evo before. In fact, we have found it a very desirable mod because over time, the damper in the stock pully tends to seperate from the pulley itself, causing all sorts of nasty issues very quickly.
UR, I put it on, just the crank pully, engine revs faster for sure. BUT the turbo also spools MUCH faster, good news for my 272's. Car loved it, smothed out the topend, my car is a beast for a stock turbo car.
the thing is... these are the types of responses you'd expect... maybe the 1g/2g were just old cares bein' beat to ****... i don't believe sheperd babies his car... but then again is it really normal to have weird **** blow up? eh... it's ur car in the end.
the reason i want to get a pully is because of efficiency... i would only get a lightened crank pulley because it is the same as getting a lightened flywheel, efficiency wise. you get that hidden horsepower by making the rotating assembly lighter. (never a bad thing right) but then there's this tiny reliability problem... sigh.
the reason i want to get a pully is because of efficiency... i would only get a lightened crank pulley because it is the same as getting a lightened flywheel, efficiency wise. you get that hidden horsepower by making the rotating assembly lighter. (never a bad thing right) but then there's this tiny reliability problem... sigh.
1st off, only get the Crank pully. 99.9% of your gains will be there. Vendors have told me that the rest are just for show and MAYBE add 1WHP not worth the cash. The crank pully, you will feel...
so who's gonna get a crank pulley from who... ur seems to be the most trusted brand... perrin makes one and so do a few other little manufacturers... let's get all the info and put this to rest!
i know that 500whp is running one... forgot which...
i know that 500whp is running one... forgot which...