I'll hook you up dude! At firestone even... Tomorrow! No, you shouldn't need new belts. Which pulley? Crank? Alt? P/S?
it would be much appreciated!!!!!111. ill be there between 730-930 probably becuase jason is returning my computer. do i need to bring anything (tools.. redballs)??. BTW this is a light weight pulley and yes its the crank pulley
I'll bring the tools, but tools for a crank pulley only. And no...you can't keep them when i'm done with them!!! lol
^^ Does the lighter weight make it spin faster sooner? I've heard heavier pullys create more tourque, and lighter ones relieve stress on the crank shaft.
There's a huge argument to get into over pulleys... Lighter weight can let the engine spin quicker, but idle can be compromised due to the loss of rotational mass, same problem as a lightened flywheel. It can reduce pressure on the main bearings for the crank by having less weight on the front of the crank, but if the pulley isn't true, it could also cause damage by "wobbling" the crankshaft. I would just leave a WRX one stock, as the motors sometimes idle rough and low anyway, but your 06 has a 2.5L which idle better than the 2.0L. It's all up to the owner.
okay so ive had an 11lb flywheel (stock is 22) on my L for about roughly 60K (total of about 170K miles on car) miles, also an underdrive pulley, i have a raised rev limit, and i beat the living F out of my car constantly, it wont hurt anything, trust me. i dont have idle issues, i dont have charging issues (and i have a system)
The pulley will only help when your engine is revving quick. That's what lighter weight stuff helps with. It doesnt make you lose torque up top or gain some here or there.......It just so happens you see it working better in 1st and 2nd gear because your engine's speed increases faster in those 2 gears than 3rd and 4th +. SO IT SEEMS you're not seeing any gain in 3rd 4th gear, well that's because the engine speed isn't really increasing as fast as 1st 2nd gear. I didn't expect to GAIN anything..just lose some lbs really and help things move along easier.
There is no chance that swapping a crank pulley (even with a under-drive pulley) will mess with the timing or the RPMs. First, it doesn't drive the timing belt. The timing belt is ran off a gear of the crank inside the timing belt cover which powers the cam gears and other gears needed to have the engine run in synch with all the moving parts inside the engine. Secondly, swapping the pulley (no matter the size) for a lighter one will not affect the RPMs of the engine or the speed of the vehicle. It just reduces rotational weight which allows the engine to respond better to throttle input and reduces the drivetrain loss by a small margin. It doesn't affect the speed sensor. However, having smaller/larger diameter tires will affect the RPM vs MPH. The only drawback, it requires a few HP of the engine to maintain the RPM of the engine (whether there is load on the engine or not). This causes a reduction of MPG because light components slow down quicker.
Are you talking about when its at idle? And does lighter engine componets improve the throttle response...?
well you also have the far superior 2.2l engine. Mike: did you get an underdrive pulley? or just a lightweight. if its under drive it is prolly a different size and will need new belts.
Say, if you guys have issues getting the crank pulley off like I did, I made the tool you can't buy to hold the crank pulley while you pass the socket through the cenyter of the tool. Let me know if you need it!
^ lol I thought of you Matt when I first read this thread...we had a hell of a time with that crank pulley.
I'm talking about engine speed at Cruising speeds. Idle for my pulley was not harmed at all. My shifts were better because it slows the engine RPMs fast enough to match the same speed as the tranny/wheels when I shift. No need to wait 1-2 seconds every gear shift for smoothness. Yes, it does increase throttle response that you can feel.
Thats not entirely correct... If you have less weight on your engine, it takes less effort to get it moving, so it's almost an equal change. However, if you can't keep your foot out of it... You'll lose MPG cause your beating on your car
Yes, and you're referring to rotational mass, correct? I meant to say that a heavier crank pulley maintains more rotational momentum compared to a lighter crank pulley.
^^^ Thats exactly it. The new pulley will weigh less, so the engine will decel faster, but not exactly use more fuel. In decel, the engine goes lean anyway, so the amount of fuel used will be so little, that it's almost not worth mentioning. The basis for a lightened pulley, for those who don't know, is to get quicker rev's (rpm) from the engine by reducing the drag against it. The downside of the lightened pulley, is that the factory one has a rubber dampener in it, to fix any vibration in the crankshaft from either the driveline, or any engine issues that can cause uneven running conditions. As for most parts, there is an up/down side. With a pulley, you get quicker revs, but can risk damage to your crank and block/bearings from vibration that cannot be absorbed by the factory dampener. Most people won't ever have a problem.
I have read somewhere that someone confirmed with SOA that the OEM pulley is not a dampener. I just don't remember where I read it from. For the record, my Impreza RS with 100,000 miles on it never had an issue with the crankshaft. The lightweight pulley was installed on it at 40,000 miles and I drove it pretty hard from time to time. I currently have a pulley on my FXT and don't expect any issues out of it. I'm just saying that because people say that the dangers are out there from a pulley install, but my experience proved otherwise.
