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Old 05-12-2011, 03:38 PM   #1
onebadwrx
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Default Official: GrimmSpeed Lightweight Crank Pulley Review

GrimmSpeed Lightweight Crank Pulley
http://www.grimmspeed.com/catalog/pr...roducts_id=230

Hey Guys I received the GrimmSpeed lightweight crank pulley as a test part in March and though I would write a review on the thing! I previously was running the Perrin lightweight crank pulley and before that was using the stock pulley. I feel having used a couple of different pulleys I can give an accurate account to the effects of them.

Aesthetics:
At first look the craftsmanship of the GrimmSpeed pulley is top notch! All edges are rounded and smooth the belt grooves are clean and precise and it is less than half the weight of the stock pulley. The keyway where it mounts to the crankshaft is spot on and fits nice and snug with not much wiggle room! The finish is also a nice deep black.

Performance:
Here is the part you all want to know about! After installing the GrimmSpeed Pulley which took a little less than 30 minutes start to finish. I started the car the idle is as smooth as it was with the factory pulley. I went Driving around the block the car runs very smooth the RPMíS climb very smoothly and with ease. My car used to have a slight hesitation with the Perrin pulley but we will get to that comparison later. As I pull out of the neighborhood onto the main street the RPMís Climb much quicker than with the stock pulley. The cars power band is much smoother and it feels in the butt dyno to climb to redline much faster than stock! I notice a huge difference when shifting aggressively the 1-2 and the 2-3 shifts have increased nicely. The RPMís between these shifts seem to stay up and it cuts out a lot of the power band lag so to speak the car immediately picks up where 1st left off and 3rd gear picks up right where 2nd let off there is no more RPM drop between shifts. I also notice that when coming to a stop quickly the RPMís no longer dip making it feels as though the car is going to stall which is a welcomed improvement over the Perrin pulley!

Comparison-

GrimmSpeed vs. Stock
Ok so honestly there is no comparison between the GrimmSpeed pulley and stock pulley. There is a night and day difference. Imagine the difference between carrying around a can of coke and carrying a 24 pack and going for a sprint! The car just runs better and easier allowing it to use power better.

GrimmSpeed vs. Perrin
There were a number of things that I liked about the GrimmSpeed Pulley over the Perrin one. The craftsmanship is a lot better, all the corners on the GrimmSpeed pulley are rounded and smooth as opposed to the Perrin one that all the edges are seemingly sharp and cookie cutterish. The finish on the GrimmSpeed pulley is a nice deep black color and the Perrin one is more of a dark purple or faded black. The GrimmSpeed pulley is slightly heavier than the Perrin one but, before you say well donít you want it to be as light as possible? The difference in weight is not much but it has seemingly fixed some minor quirks I had! With the Perrin pulley my car would idle a little low and kind of shudder some, the power band felt more like a V-tech car with the power snapping on and when stopping quickly the car RPMs would dip as if the car wanted to stall. Also since switching from the Perrin pulley to the GrimmSpeed one I lost almost all of the cruising speed knock I used to get. Some may argue the differences I have found but to me the proof is in the part and my car seems to just run better with the GrimmSpeed Pulley!

All that being said my car feels a lot more responsive and seems to make power a lot easier. I would recommend this pulley to anyone in the market for one over the competitors any day. I am so confident in fact that I have sold both my stock and Perrin pulley as I am confident this will be the only one I will ever need.

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Old 05-12-2011, 06:05 PM   #2
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looks awesome man. im really excited about these! thank you so much for the review!
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Old 05-12-2011, 06:58 PM   #3
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LoL, I take it my review is not "official" ..... or you didn't see the other thread.

Good write up!
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Old 05-12-2011, 06:58 PM   #4
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LoL, I take it my review is not "official" ..... or you didn't see the other thread.

Good write up!
No haha, I didn't where at?

Will
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Old 05-12-2011, 07:00 PM   #5
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Quote:
Originally Posted by GrimmSpeed

No haha, I didn't where at?

Will
I bumped it. I figured you didn't, but I do like you write up!
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Old 05-14-2011, 12:09 AM   #6
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Is it just an optical illusion or is the GrimmSpeed pulley larger than the stock one?
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Old 05-14-2011, 12:12 AM   #7
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Originally Posted by Carlito2002WGN View Post
Is it just an optical illusion or is the GrimmSpeed pulley larger than the stock one?

Just an optical illusion. They are the same size.

Justin Grimm
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Old 05-14-2011, 04:13 AM   #8
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I cringe when I see V-Tech... it's VTEC (Honda Guy)

Fantastic write up. I know I'll be buying one of these in the future.

-B
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Old 05-19-2011, 06:25 PM   #9
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Quick question, do you notice an increase in how fast the rev drops during off throttle condition? Or, during shifts? Thanks.
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Old 05-19-2011, 09:23 PM   #10
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You seem to exaggerate a bit too much in your review.

I have had Perrin lightened crank pulley for the last 4-5 years and never had symptoms you have described.
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Old 05-19-2011, 10:27 PM   #11
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Sorry post in the wrong thread... you can delete.

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Old 05-20-2011, 07:04 AM   #12
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You seem to exaggerate a bit too much in your review.

I have had Perrin lightened crank pulley for the last 4-5 years and never had symptoms you have described.
I am sorry you feel I exaggerated but I gave an honest review of the parts and gave the comparison of how my car acted with diffrent pullies.

Diffrent cars will act diffrently with diffrent things. Glad to hear you have not had any issues.
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Old 05-20-2011, 07:07 AM   #13
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Originally Posted by A5un View Post
Quick question, do you notice an increase in how fast the rev drops during off throttle condition? Or, during shifts? Thanks.
I actually noticed that between shifts the RPM stayed up and it cut down on the boging inbetween shifts
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Old 06-02-2011, 12:14 PM   #14
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Bump for good review

Installed pulley yesterday on MY06 STi, easy install (I did not purchase the pulley removal tool since I just made my own), works as advertised, great product.

Zorin
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Old 06-07-2011, 12:05 AM   #15
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I finally get to add my 2 cents (been avoiding the 103F heat).

I have an aftermarket radiator so this install wasn't as breezy on my bugeye as it is in the install video. I removed the idler pulley to get extra room for the breaker bar, and stubbornly refused to remove the radiator fans. Even still, the install wasn't bad at all.

Just got back from the first drive, and I have to say I'm satisfied. The engine definitely free-revs quicker and smoother. First and second gear are now noticeably smoother as well. It is easier to get going from a light, and due to the free-er revs it feels like there's almost a little more low-end torque which is a definite plus for the little 2Liter. The whole powerband just feels more "zippy".

3rd and 4th gear are smoother but it's less noticeable than the lower gears. I know I keep describing it as smooth but that really sums up how the whole engine feels now compared to stock. It feels a lot easier to get the car going with the A/C on as well. Frankly I wish I would have done this a long time ago, but I'm glad a held out for Grimmspeed's great product.
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Old 06-07-2011, 11:25 AM   #16
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Thank you for the great review and I am so pumped that you enjoyed it this much! We really work hard to make sure we offer our community the right products and I am glad it has helped you!

Will
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Old 06-08-2011, 11:46 PM   #17
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Installed mine earlier today on my automatic FXT, I know a lot of people do not approve of light weight pully for a 4eat, but I did some research and took the plunge to take advantage of the group buy. I spent a good amount of time sitting in my car and feeling the idle with both the a/c on and off, engine cool and hot. I then did the drive to a friends, installed pulley and drove home. The drive home felt smoother and accelerations a little quicker, but the real proven difference was when I checked hot idle after the drive. I could barely feel the engine while idling, with exception of the small bump of the a/c kicking on and off. Major difference. Thanks Grimmspeed.
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Old 06-09-2011, 06:41 PM   #18
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Installed mine earlier today on my automatic FXT, I know a lot of people do not approve of light weight pully for a 4eat, but I did some research and took the plunge to take advantage of the group buy. I spent a good amount of time sitting in my car and feeling the idle with both the a/c on and off, engine cool and hot. I then did the drive to a friends, installed pulley and drove home. The drive home felt smoother and accelerations a little quicker, but the real proven difference was when I checked hot idle after the drive. I could barely feel the engine while idling, with exception of the small bump of the a/c kicking on and off. Major difference. Thanks Grimmspeed.
Hey, yeah I completely agree with the smoother operation, just installed it on my (new to me) personal wrx and LOVE it!

Will
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Old 06-10-2011, 09:06 AM   #19
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Hey, yeah I completely agree with the smoother operation, just installed it on my (new to me) personal wrx and LOVE it!

Will

Yeah I will agree with this 100%. I wrote up my review (Click) almost a month to the date... so I have had my pulley for about a month and a half now. My car runs so smooth @ stop lights. I used to be able to feel the engine and the car would shake a bit sometimes. That has all disappeared since the install of the pulley. Thanks again GrimmSpeed for such a great product.

Derek
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Old 06-25-2011, 04:08 AM   #20
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Just installed mine. It was first of all, impossible to use the Grimmspeed installation tool to remove the OE pulley if you have my type of pulley. My 1/2" socket wrench interfered with the 4 larger sized Allen bolts. My breaker bar did too. There was not enough space to use an extension, either. So, I ended up doing the 5th gear with brake trick... Maybe a deep socket would work? I don't know. So, if you're going to use the installation tool, I suggest you do a dry run first before you remove all the belts. I also suggest you get a 6pt socket instead of a 12 like I did (because that's all my local store had). The pulley bolt after I took it out was very slightly rounded at the corners. I still managed to torque it down without a problem with my torque wrench, but I think you want to be safe rather than sorry.

Other than my own mistakes, it was a straight forward installation. I spent most of the time on trying to figure out how to get that damn OE pulley off and finally just said "forgetaboutit!"

The Grimmspeed adapter though works very well with the Gates' kit. I highly suggest you get that if you're going to do the installation yourself and if you've got a stretch belt for the AC pulley. Just a word of reminder, be sure to remove the Gates' tool after the belt snaps to position (i.e., when the tool is at the top). Don't do what I did and continue to turn a full 360 LMAO! See this video for more clarification:


So, instead of Grimmspeed video where the tool started at the top, I think it's better to have the tool starting at the bottom.

Lastely, that pulley bolt is a major PITA to get off. I don't know how the Grimmspeed video made it seem so effortless. I was using my 1/2" wrench with my floor jack arm as an extension. I broke a brand new Craftsman 1/2" x 18" breaker bar in the process of doing this. Maybe it's the quality of the Craftsman these days, but it goes to show how much muscle you'd be applying to that sucker. And that took all my body weight and then some to break loose. Oh, and I weight 215...gatta stop drinking 'em beers...

So this ended up being a review of the installation tool more so than the actually pulley, but that's okay. I don't think my review will be any different than the other guys' so I thought I'd contribute more by writing a bit about the installation process.

Quick update: I noticed a significant reduction in steering wheel vibration. I have several upgraded bushings around the car, including engine mount and rear diff inserts and transmission mount... Before changing the pulley, I can feel A LOT of vibration through the steering wheel. That's not to say that I disliked that. But just noting that at least the pulley is removing most of the vibration. It is also slightly easier to take off from the line, but not significantly much easier for me. Another notable change is that throttle on transition from off throttle. Before the pulley upgrade, there is a very noticeable delay or unsmoothness when I go from off throttle to throttle. With the pulley, the transition is nearly perfectly smooth. It makes for a smoother drive for sure.

Last edited by A5un; 06-25-2011 at 05:17 AM.
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Old 06-27-2011, 10:00 AM   #21
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Hey, thanks for the review!!! Our Pulley Removal/Installation Tool does in fact work with all OEM Pulleys however in some/most cases a deep socket is what you will need to properly get the center bolt out.

I guess our engineer is strong haha, he is a rock climber so it seems to make sense!

Will
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Old 06-27-2011, 10:02 AM   #22
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I just bare handed mine! Reached down and grabbed the bolt with my index finger and thumb and used my arm as a breaker bar and loosend mine ..............J/K
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Old 06-27-2011, 04:10 PM   #23
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I did the mod for my brother too on his 2011 2.5i last night. It had more space between the pulley and the radiator fans, so it was easier of an install. Plus, the car was newer, so it was easier to take the bolt out. Still, though, I was pretty hard on the damn bolt. My cheapo breaker bar from Pepboys was literally bending from the amount of torque was I was putting on it.

As for review of the pulley on 2.5i...well, I'll let him chime in when he's had a thorough drive.
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Old 07-14-2011, 04:32 PM   #24
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I did the mod for my brother too on his 2011 2.5i last night. It had more space between the pulley and the radiator fans, so it was easier of an install. Plus, the car was newer, so it was easier to take the bolt out. Still, though, I was pretty hard on the damn bolt. My cheapo breaker bar from Pepboys was literally bending from the amount of torque was I was putting on it.

As for review of the pulley on 2.5i...well, I'll let him chime in when he's had a thorough drive.
Please tell us how did this go, liking it so far on the 2.5i?

Will
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Old 07-30-2011, 02:51 AM   #25
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I'm surprised no one said anything about weight comparison. Well, as you can see, the stock crank pulley is 4.6 lbs and the Grimmspeed crank pulley is 2.2 lbs. My scale wouldn't detect the Grimmspeed pulley by itself, thus, I put the two together and minus the difference.

Anyways, like most of you said, the Grimmspeed lightweight crank pulley feels smooth and a lot better. So far, no check engine light and I'm one BIG happy camper. Thanks everyone at Grimmspeed.
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