Question about Underdrive pulleys

1569 Views 5 Replies 4 Participants Last post by zulued, Mar 11, 2007

fireant

Discussion Starter · Mar 10, 2007

Last week I ordered the $80 stock diameter lightened pulley from Unorthodox Racing. This model allows you to keep the stock belts for your AC and Alternator. The performance benefit is slightly less than using the underdrive, but it costs much less and your accessories will run exactly like normal.

Today UPS delivered my pulley, but it turns out they sent me the $190 Underdrive model for my $80.

So I could keep it and just buy new belts, having saved roughly $110 on the underdrive model, or I can contact them on Monday and get it switched out for the one I ordered.

I am using a small G13 battery in my car, and I use the AC constantly during the hot Texas summers. It is very important that I dont screw those two things up, as the car is used for commuting as well as weekend fun. Should I be concerned at all about using the underdrive pulley instead of the stock diameter?

More specifically, is my AC going to cool less? Is my car going to run like **** when I turn on the headlights?

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DAP91Si

· #2 · Mar 10, 2007

I don't see the stock diameter lightened pulley on their website. You may have accidentally ordered the accessory pulley and they in return accidenatlly sent you the underdrive pulley.

If you don't want to try it you can return it only if they will pick up the shipping cost. If not, keep it and sell it and make a small profit for your troubles.

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fireant

Discussion Starter · #3 · Mar 10, 2007

Here's what I bought:
http://www.unorthodoxracing.com/Merchan ... =crxtunerS

And here's what I got:
http://www.unorthodoxracing.com/Merchan ... =crxultraS
(though the picture there has holes, mine does not have holes, but it does weight 2lbs, and is smaller than stock)

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signalpuke

· #4 · Mar 10, 2007

I know that the stock crank pulley on most engines is engineered to dampen some of the vibration from the crank, keeping it from going to the valvetrain via the timing belt/chain. My personal opinion is to leave the stock crank pulley on the engine, or use a fluid damper pulley engineered for your specific engine setup.

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fireant

Discussion Starter · #5 · Mar 10, 2007

signalpuke said:
I know that the stock crank pulley on most engines is engineered to dampen some of the vibration from the crank, keeping it from going to the valvetrain via the timing belt/chain. My personal opinion is to leave the stock crank pulley on the engine, or use a fluid damper pulley engineered for your specific engine setup.

I have found lots of posts about that same subject, but nowhere in any racing or daily driven cirlces have I found any first hand accounts of it happening after researching it for weeks. I have found many many posts from autocrossers with my same setup who simply say they've never had a problem with it.

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zulued

· #6 · Mar 11, 2007

a friend of mine put a ur crank pully on his y8 motor sortly there after it blew up... after the 3rd motor blew up within 10k miles hey gave the pulley to me.

i put it on a y8 motor i had in my hatchback that motor blew up after 500 miles.

when i say it blew up i mean it threw a rod or main bearing.

i personally wont run them, and i didnt notice much of a difference when i had it on. so i simply just shy away from them.

stock is always best

scarponze

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