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View Poll Results: Did you feel a difference in performance after installing your light weight pulley?
Yes, nothing huge but I defiantly felt some improvment over stock. :-) 21 84.00%
Nope, I felt no notable difference at all. :-( 4 16.00%
Voters: 25. You may not vote on this poll

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Old 07-28-2008, 01:15 AM   #1
iyzmi
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Default Notice Any Difference from a LWP?

Seen a lot of mixed answers to this question and wanted to see how the results would add up in a poll. Posted this in the N/A section because I'd like to see if the RS/2.5i guys felt any difference, not the turbo guys.

I also have a question to ask: I'm going on a 400 mile subie cruise next week and I will the opportunity to install my Cobb pulley before the trip. Do you guys think I should install it before or after the cruise? I'm thinking it would get me slightly better gas mileage but wanted to know if there would be any cons to running my lightweight pulley on this mainly highway trip rather than the stock one.
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Last edited by iyzmi; 07-28-2008 at 01:20 AM.
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Old 07-28-2008, 02:37 AM   #2
ballitch
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I wouldnt think there would be any drawbacks to having the LWP on for the trip. You might see a slight increase in fuel mileage, but its not likely.


~Josh~
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Old 07-28-2008, 05:00 AM   #3
Spore
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As ballitch said, there would be no negative drawbacks for the pulley (except for improper installations). That said, I didn't quite feel the difference as people have vouched. I may not experience the difference because mines a 4EAT I can tell the difference if I put it in N. But in D, I can't really tell the difference. That said, you should definitely install it before you go for the cruise.
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Old 07-28-2008, 07:54 AM   #4
06OutbackSport
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If you're cruising at steady speed, the pulley won't do much of anything for you (in terms of MPG). When you're doing force calculations for the necessary forces of the engine to move you at a certain speed, engine parts moving at constant speeds can be considered static. The only way to get an increase in MPG here is to do something like decreasing aerodynamic drag (decreasing the force on the car so the engine requires less force), decreasing weight (ditto), or decreasing drivetrain or road losses (fluids and tires).

You'll only notice a difference in the forces when you're changing speed. Accelerating and engine braking will be slightly more pronounced. If you're looking to save money on gas and haven't done it already, synthetic gear lube in your transmission or differential will do more for you than a LW pulley (I've noticed +2.5 MPG over 5 tanks since I've changed the fluids).

All that being said, if you have the opportunity to install one, go for it. You won't be going at a steady speed all the time, and as long as the install is done correctly and proper tension is put on the belts, there aren't really negatives to having one.
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Old 07-31-2008, 12:39 AM   #5
iyzmi
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Just got mine installed today. Didn't really feel any difference besides the fact that the car doesn't really engine brake anymore. Only drove 3 miles with it so I'll see how it goes after driving around with it for a bit...
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Old 07-31-2008, 04:22 PM   #6
Jerry Xu
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Differences felt for the sensitive.
I was very happy with the improvement it made. Got rid of 50% of the throttle lag too.
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Old 08-09-2008, 09:46 PM   #7
scoobyimp07
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I guess it would help if we knew which pulleys you guys were running. I am interested in doing this, and just curious. Maybe there are different results from different pulleys? Thanks.
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Old 08-09-2008, 10:02 PM   #8
apexanimal
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i got the perrin lwp... not underdriven...
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Old 08-10-2008, 01:56 AM   #9
iyzmi
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Quote:
Originally Posted by scoobyimp07 View Post
I guess it would help if we knew which pulleys you guys were running. I am interested in doing this, and just curious. Maybe there are different results from different pulleys? Thanks.
All light weight pulleys are basically the same. The brand makes practically no difference for this mod. Some common ones are Cobb, Perrin, and Group A.
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