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Old 10-21-2009, 02:16 AM   #1
explosivo
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Default Perrin Lightweight Pulley Dyno Results

Finally got my lightweight crank pulley in, and took it down to Goodspeed today. I did a few runs on the dyno pre pulley install and layed down the
following:

287.1WHP
318.7 Torque

With the car still strapped down on the dyno, I had goodspeed swap the pulley and do two more runs:

The first run while the engine was cold, showed the following:

297.6 WHP
316.6 Torque

The second run immediately following showed:

296.2 WHP
323.4 Torque


The dyno chart pre and post is pretty awesome. In the lower RPM band, I gained a max of about 8hp and 10 torque. In the higher RPM band, I gained 9HP and 7 torque at peak, but the real gains are after 5k RPMS when my HP/Torque started to fall off, but after the pulley install, my HP was anywhere from 15-18HP higher, and my torque was 15-20 higher on the tail off.

Initial driving impressions are pretty awesome as well. I noticed that it helped with lag between gear shifts, and my overall powerband feels smoother. I would say, this mod is definitely worth 100 bucks.

I have the video, but the damn thing is 75 megs, gotta shrink it down a bit.

http://i159.photobucket.com/albums/t...ypewp/Dyno.png
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Old 10-21-2009, 02:36 AM   #2
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what are your mods besides the pulley?
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Old 10-21-2009, 02:52 AM   #3
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Hmmm... maybe I should rip the perrin light weight pulley off my GC and throw it on my wagon...
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Old 10-21-2009, 09:42 AM   #4
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Quote:
Originally Posted by bObby View Post
what are your mods besides the pulley?
vf39 and sti top mount prob exhaust and intake too.
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Old 10-21-2009, 11:04 AM   #5
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how much lighter is the Perrin pulley vs stock? Is it underdriven?
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Old 10-21-2009, 11:16 AM   #6
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Quote:
Originally Posted by fastnoypi View Post
how much lighter is the Perrin pulley vs stock? Is it underdriven?
its not underdriven, i think its 3 pounds lighter, nice piece though, dont clean it with engine solvent or it turns purple.
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Old 10-21-2009, 11:31 AM   #7
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Quote:
Originally Posted by explosivo View Post

The dyno chart pre and post is pretty awesome. In the lower RPM band, I gained a max of about 8hp and 10 torque. In the higher RPM band, I gained 9HP and 7 torque at peak, but the real gains are after 5k RPMS when my HP/Torque started to fall off, but after the pulley install, my HP was anywhere from 15-18HP higher, and my torque was 15-20 higher on the tail off.

Initial driving impressions are pretty awesome as well. I noticed that it helped with lag between gear shifts, and my overall powerband feels smoother. I would say, this mod is definitely worth 100 bucks.
???

I agree that the pulley makes drivability and throttle response feel better. However a pulley cannot add horsepower per se. What it will do is get your RPM up faster, which gets you to a higher torque sooner, and therefore increases the HP at a given RPM. It cannot add to peak torque or HP. All you are doing in reducing the rotational inertia of the engine's rotating assembly.

So in that regards, this thread is hugely misleading and incorrect.

However, I'm glad you took the time to do before and after dyno plots and that you like the results.
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Old 10-21-2009, 12:34 PM   #8
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Quote:
Originally Posted by The Satch View Post
its not underdriven, i think its 3 pounds lighter, nice piece though, dont clean it with engine solvent or it turns purple.

Mines purple. I thought it came that way?

Also, blkscooby makes a good point.
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Old 10-21-2009, 12:41 PM   #9
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*edit* reading comprehension ftl
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Old 10-21-2009, 01:37 PM   #10
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Quote:
Originally Posted by blkscooby View Post
However a pulley cannot add horsepower per se.
It can't make more HP at the crank, but as measured at the wheels, the car has more (usable) power. Thus, in real world applications it "adds" power (since we car about power hitting the ground and propelling a car...not power wasted in burnouts or power to actually turn the engine itself).
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Old 10-21-2009, 01:43 PM   #11
explosivo
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Quote:
Originally Posted by blkscooby View Post
???

I agree that the pulley makes drivability and throttle response feel better. However a pulley cannot add horsepower per se. What it will do is get your RPM up faster, which gets you to a higher torque sooner, and therefore increases the HP at a given RPM. It cannot add to peak torque or HP. All you are doing in reducing the rotational inertia of the engine's rotating assembly.

So in that regards, this thread is hugely misleading and incorrect.

However, I'm glad you took the time to do before and after dyno plots and that you like the results.

well, I wouldn't say misleading.... it does add HP/Torque by freeing up existing HP previously taken up by rotating a heavier mass. By lowing the inertia, you are able to put more of your already existing horsepower to the wheels, so in a sense it is like adding more HP/Torque. Anyway you want to put it, I saw gains across the board, which makes the car more enjoyable to drive with a little extra power.
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Old 10-21-2009, 01:47 PM   #12
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Quote:
Originally Posted by The Satch View Post
its not underdriven, i think its 3 pounds lighter, nice piece though, dont clean it with engine solvent or it turns purple.
Its actually 4lbs lighter. The stock pulley is 5lbs and the perrin is 1lb. They claim its like removing 100lbs from your car. If anyone is thinking about getting one, stick with the Perrin, Joe at goodspeed said they installed an agency power one and the fitment was poor and it wasn't as well engineered as the Perrin one.
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Old 10-21-2009, 01:52 PM   #13
explosivo
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Quote:
Originally Posted by bObby View Post
what are your mods besides the pulley?
VF39 / STI top mount
Maddad v2 headers & Up pipe
HKS Downpipe
Greddy Evo2 Exhaust
Perrin Silicon Turbo inlet
Treefrog Tune

Still running the stock airbox, don't think I'm going to change it unless I
go with a new turbo setup.
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Old 10-21-2009, 04:21 PM   #14
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You know what would make some real power? A tune.

EDIT: Missed that. Nevermind.

Last edited by kpluiten; 10-21-2009 at 05:51 PM.
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Old 10-21-2009, 04:26 PM   #15
THE ONE
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Nice numbers and thanks for the post. I did this mod to my first WRX and honestly didn't feel a difference. Was that because it was a 2003 MY?
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Old 10-21-2009, 05:36 PM   #16
SaabaruMike
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Originally Posted by kpluiten View Post
You know what would make some real power? A tune.
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Old 10-21-2009, 05:43 PM   #17
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Sweet man glad to see the car is running well. Nice gains with the Pulley
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Old 10-21-2009, 06:12 PM   #18
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Did you drive the car all the way to BFE, boosting it whenever you can, then strap it down to the dyno and take your base run. Then let it sit, get it nice and cool, change out the pully, ice the IC, and then do your 2 runs?
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Old 10-21-2009, 08:39 PM   #19
explosivo
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Quote:
Originally Posted by KP View Post
Did you drive the car all the way to BFE, boosting it whenever you can, then strap it down to the dyno and take your base run. Then let it sit, get it nice and cool, change out the pully, ice the IC, and then do your 2 runs?
I work in Tempe, so its just a drive down the street to goodspeed. Went to goodspeed, they strapped it down and did a few baseline runs to dial in the dyno and set the load/traction and all that stuff. Then let it sit for about 15 minutes, sprayed the intercooler with a little water to cool it down and strapped on the fan.

Did two back to back runs, to get my baseline numbers

Left car on the dyno with the same settings, and swapped out the pulley.

Started the car again to make sure everything was cool with the pulley and
did a mild run. Let it sit for about 10 minutes, sprayed down the intercooler again and did the final 2 runs to get my last set of numbers.
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Old 10-21-2009, 09:10 PM   #20
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Quote:
Originally Posted by explosivo View Post
I work in Tempe, so its just a drive down the street to goodspeed. Went to goodspeed, they strapped it down and did a few baseline runs to dial in the dyno and set the load/traction and all that stuff. Then let it sit for about 15 minutes, sprayed the intercooler with a little water to cool it down and strapped on the fan.

Did two back to back runs, to get my baseline numbers

Left car on the dyno with the same settings, and swapped out the pulley.

Started the car again to make sure everything was cool with the pulley and
did a mild run. Let it sit for about 10 minutes, sprayed down the intercooler again and did the final 2 runs to get my last set of numbers.
Not bad
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Old 10-22-2009, 01:19 AM   #21
DerickRyoung
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I have a perrin pulley and I am happy w/ it. My tuner disagreed w/ it and said I shouldve kept a stock one, he said these arent made w/ a harmonic balance? I kept it anyways, but anyone heard of this?
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Old 10-22-2009, 02:30 AM   #22
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Originally Posted by DerickRyoung View Post
I have a perrin pulley and I am happy w/ it. My tuner disagreed w/ it and said I shouldve kept a stock one, he said these arent made w/ a harmonic balance? I kept it anyways, but anyone heard of this?
hes right, but i'm pretty sure that our motors are internal balanced, so untill you get way up in the rpm's you dont really need it. but if you run your motor way up high in the rpm's, i would keep the stock one. i have the perrin one and i like it. it was great fitment and it had the shaved outer lip, for the easer install on the 08 and up strech a/c belt.
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Old 10-23-2009, 02:44 PM   #23
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yeah these arent great for high rpm running. my s202 motor doesn't have the internal balancing like the usdm motors, and i couldnt run an aftermarket pulley unless it was dampened.
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Old 10-23-2009, 11:32 PM   #24
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Quote:
Originally Posted by WgnWheel View Post
yeah these arent great for high rpm running. my s202 motor doesn't have the internal balancing like the usdm motors, and i couldnt run an aftermarket pulley unless it was dampened.
what pulley did you try on your s202 motor and what did you notice at high rpm?
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Old 10-23-2009, 11:47 PM   #25
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Quote:
Originally Posted by fastnoypi View Post
what pulley did you try on your s202 motor and what did you notice at high rpm?
i didn't try anything other than stock! i was advised when it was purchased to specifically not run any lightweight pulley on it. ATI has a nice dampened pulley i thought of trying.

i had a cobb on the stock motor and it did as expected, with good results.
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