GrimmSpeed Lightweight Pulley - 2015 Subaru WRX Install/Review
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- เผยแพร่เมื่อ 28 ส.ค. 2024
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Rick Installs and Reviews the GrimmSpeed Crank pulley on our 2015 Subaru WRX!
Your factory crank pulley is responsible for transferring energy from your crankshaft to your water pump, a/c compressor and alternator. It does this by way of a rubber belt and it does it's job well. The drawback to the factory pulley is that it's quite heavy. Reasons for this include less expensive manufacturing and using the pulley's mass to smooth out 'noise' in the accessory system (NOT to be confused with functioning as a harmonic dampener, which it does not). The GrimmSpeed Lightweight Crank Pulley reduces the rotational mass of the system, allowing your engine to accelerate and decelerate the rotating assembly more quickly.
4:00 Vtech kicked in bro!!
that accord walked u lol
I drive like I'm 90 years old lol.
Thanks,
Rick
so did the ram
Is the installation as simple as getting the bolt loose and bolting up the new one to spec torque? Do you need to worry about messing up the cam timing other internal adjustments? Also any additional benefit from swapping other pulleys as well? I believe the FA20 has three lightweight pulleys out that will fit the Crosstrek FB20. Thanks
@rallysport
id love a reply for this
🦗 🦗
I think this will add the car about 1-5 hp, doesnt make a big difference ,, they look nice tho. If you have tons of horse power on a car i would not recommend alloy pulleys , they could bend if you put too much tension and heat at the same time
i saw another video were you could buy a tool to hold it in place while unbolting the crank pulley, would i need that on a 2012 legacy
What was the torque specs on the bolt for the crank pulley?
I ordered one and quickly canceled after reading about accelerated bearing failure. Not on my baby!
this video is extremely misleading on how to swap these out. you def need a tool to loosen off the stock pulley....and u have to pull off at least 1 of the front fans in order to have enough room to pull off the bolt for the pulley...
of course you edited those parts out to make it look like a 5 minute install....not cool...not cool
The crank pulley removal tool is nice for sure, but on a manual car you can easily put it in top gear, have someone hold the brakes and use a giant breaker bar to break the bolt loose. In regards to the fan, we did not remove any fans for this install, and all of the instructions I can find online do not mention the removal of the fan. Hope this helps anyone involved in the process of installing a new pulley! :)
Thanks,
Rick
@@rallysportdirect Can you do the same on a cvt? Put it in drive, engine off, and have someone hold the brakes?
You don't need a tool for this to remove the crank pully once the bolt is out. It comes right off. Just be careful to not also pull out the key way spacer out with it. The pulley fits on the end of the key way spacer and the spacer then slips over a key on the crankshaft. It will come out if you're not careful and is not easy to put back in...
Will there be any reliability issues with installing lighter crank pulley's on cars?
+krauser979 Not on the Subaru Engines, but on most engines you would want to make sure it has a proper harmonic balancer.
Thanks,
Rick
will this mess with the harmonics of the engine? causing pre mature wear?
Just had this installed. I'm finding my car is very jumpy /jerky at lower rpms. Is this normal or something to be expected?
So 5 years later how is the car?
7 years, how is the car runnin?
not sure how much truth is here but 1 pound of pulley weight acts more like 25 pounds vehicle weight or at least thats how i was told
why would you like the engine to rev down fast? isn't it better to keep the rev up between shifts to keep it within the better power range?
Late on the answer, but this is actually false. Rev hang can make shifting a bit jerky, as it will cause the engine and flywheel to continue operating at a higher speed than the friction plate, so when the two reconnect (when you let go of the clutch) it creates a jerky, almost engine-braking force. This is especially noticeable on the 2015+ WRX when shifting 1st to 2nd.
For more proof of this, listen to a couple videos of a 2015 wrx doing 0-60 pulls. You'll hear in most/all of them that there will be a sort of "wobble" in the engine note after shifting into second gear.
4:00 Is that Bono from U2's vtech??
Try messing with the Tune Rick
Not sure how it would help if its a direct replacement. The Pulley is mounted directly at the Center-of-Gravity so there is no change in rotational load. It would just shave a few pounds off of the overall car weight. If the Pulley is larger than the OEM Pulley then I can see an improvement in response since a larger wheel means a larger tangential distance.
Do u need a tune?
I tired loosening the bolt to remove the pully but it won't come off. Only modification I have done to my 2015 wrx is added an intake and bov. Now my rpm is very low. Sometimes under 500 where the car almost stalls out. Any help would be appreciated. In the video it looks so easy as its just removing a bolt. But mine won't seem to budge. Thanks
Randy Jaglal did you ever figure out your problem?
That sounds like it could have been your BOV, from what i read, that's a symptom of an atmospheric bov, no bueno for these subarus.
Car isnt meant for a bov. Its a bpv. I heard this will affect your turbocharger. Unless you had it done at a pro shop with a tune.....
Is this warranty safe?
Will this fit my 2.0 2015 wrx its automatic
This one will not, but they do make one specific for your car:
www.rallysportdirect.com/part/pulleys/grm-095015b-grimmspeed-lightweight-pulley-blue
Thanks,
Rick
Would you need a tune
Nope! This will be a 100% bolt on with no tune required.
Thanks,
Rick
LOOK THE HONDA NEXT TO YOU WANT A RACE RICK. HAHA
Hey Rick whats the verdict on the pulley now that youve had it for a while?
+Kris Babas Love it! Don't expect a night and day difference, but it is something you can feel for sure, and for how inexpensive and easy they are to install, I would highly recommend it! :)
Thanks,
Rick
I'm going to do it then because short of a protune i have everything else done and I'm just looking for something to buy LOL
@@glockwhore do you still have your wrx?
Ninja Samurai yeah 500whp later lol I forgot about this post
These should fit the 16 Crosstrek right
Any answer on that?
did you need a pulley tool for the install?
+Eric Disparte due to the stretch belt design it would be highly useful. I'm sure people have done it without, but with how tight the belt is, I would highly recommend the tool.
Thanks,
Rick
But did you use the pulley tool in this install video?
No harmonic damping = really chewed up main bearings, all the way down to the copper backing in all the cars I had light crank pulleys in
Agreed, but when you reduce weight you increase the amplitude of naiscent harmonics proportional to the decrease in overall rotational inertia etc.. thats all i was getting at
All the hybrid vehicles' engine still have the crank pulley even there is no belt. Why? Engineer not smart enough?
Yes I have done much more than seen the pulley, unless you have pulled your motor apart and inspected your mains, you are just talking shit, having your head in the sand just increases your stupid factor and leads to heartbreak, I know no one wants to hear this that's why you are so butthurt, you want your cake to eat too but it ain't happening sonny
SlingSalsa Just asking, if these are bad for motors why do the companies still make them? And what's your opion on Fluidampr and their claims?
no auto manufacturer will just toss an engine/head die, they will milk it for all its worth, look at the GM 3800 that has been in 'service' for the past 50+ years, its an good motor, it does have its issues like any motor. I have a fluidampr on all of my fleet vehicles and personal vehicles, it does what its designed to do, elastomer dampers work within a specific frequency so long as the material stays pliable, for me to use an elastomer damper makes no sense because any motor does not stay harmonically static. I have my issues with the ej motors, which is why i like to have my blocks and heads and trans cryo dipped to increase the structural rigidity, fatigue resistance, and thermal conductivity of everything on a complete build to minimize possible structural failures at really high cylinder pressures, and I will always use a silicone fluid balancer so it is effective at any harmonic range. Since a static balance is the only thing we can machine to, i find the viscous silicone is the best we have to achieve a dynamic balance.
Is there any downside to having this lightweight pulley? I have a cobb ots stage 2 sti hatch.
Nope! It will help your engine rev quicker and helps make the car feel a bit quicker as well. We run them on just about any Subaru we have!
Thanks,
Rick
just wait till you get a light flywheel with clutch. you cant run these light pulleys amd a light flywheel at same time youll get a misfire CEL....leave this stock and do a light flywheel instead. Youll get the nice blip w throttle from that. stay away from the cute $110 romance parts
+05EVORS Currently we do not plan on going with a light weight flywheel, so a light weight pulley is a great and easy way to remove some rotating mass off the engine without having to remove the transmission or engine, however you are correct in that if you run with a pulley and flywheel combination that is too light, you can have issues with misfire CELs.
Thanks,
Rick
Only can do this for the real race car.
this video is a lie its not as simple as he shows it to be
It really is not a hard install. Our WRX when this was installed has maybe a few K miles on it, so I can understand it being a bit more difficult on a car with higher mileage, but other than that, it's not too bad.
Thanks,
Rick
Your physics explanation though...yikes!🤣😂
I ain't a rocket surgeon ;)
Rick
Dont use a lightweight if you like your engine
What damage can it cause
You are right about most cars..they require a harmonic balancer...Subaru engines do not. If it’s a Subaru you don’t have to worry.
Good upgrade to shorten the life of your engine
On a Subaru the crank pulley doesn’t require a harmonic balancer..so it won’t hurt it at all just making it lighter..I wouldn’t do this modification on anything else. You are right about any other motors..
sooooooooooooooo........even if i was interested in this i can buy a cheapo ebay knock off? other than spending money on an overpriced piece of metal that will probably kill my bearings? I can't believe you guys are hypeing and made a video about a lightweight pulley, cash grab from noobs and ricers yay!!