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Old 04-07-2004, 12:53 AM   #1
JonofScio
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Default Gains from weight-reduced pulley and lightweight flywheel?

There's a stock dimensions weighed reduced Perrin pulley (1.2lbs over 5.2lbs stock) and of course I can grab a lightweight flywheel too, what sort of gains am I looking at? EJ22E N/A. No exhaust mods. Intake and electrical.
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Old 04-07-2004, 12:55 AM   #2
Ruff
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Well on the 1/4 which can be inconsistant, I trapped about .25 mph quicker on average with the addition of my perrin pulley. I will get back to you this friday, when our drag strip opens, as to what I run. I recently installed the exedy street clutch and lw flywheel.
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Old 04-07-2004, 01:21 AM   #3
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Man!...I don't know nuffin....but word out on da street is that a drop in flywheel weight from 30lbs to 12.9lbs will give you a butt dyno effect of + 12-15HP.















<--Butt dyno monkey.
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Old 04-07-2004, 08:45 AM   #4
Pat L.I.
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the flywheel will really help with throttle response, and your low end quite nicelly. It helps you get up into the sweet spot quicker! and once your in it you pull through it quicker. My revs fly up AND DOWN. i picked up the exedy sport clutch and lw flywheel combo. why not do the clutch while your in there aswell.
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Old 04-07-2004, 11:44 AM   #5
Compressed
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Yeah lw flywheel and pulley combo is very sweet. Starting from a stop or while moving at low rpm in the lower gears the combo is very noticeable and very fun. I would reccomend getting STI engine and trans mounts when doing this though. It will make the car much easier to drive at low rpms by reducing drivetrain lash.
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Old 04-07-2004, 01:42 PM   #6
m750
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Quote:
Originally posted by Compressed
Yeah lw flywheel and pulley combo is very sweet. Starting from a stop or while moving at low rpm in the lower gears the combo is very noticeable and very fun. I would reccomend getting STI engine and trans mounts when doing this though. It will make the car much easier to drive at low rpms by reducing drivetrain lash.
I just had the exedy fw, clutch, sti motor and tranny mnts put in. It's hard to tell the difference, as I was babying it w/ a slipping clutch. I don't notice much of a difference, but I don't drag or auto-x any more.
AO
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Old 04-10-2004, 01:38 PM   #7
dcoty
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I have an exedy 9lb flywheel and throttle response is crazy. But one thing to warn you about, if you get an aftermarket clutch (I have a bully 6 puck), you may get pedal vibrations at the friction point since the lighter flywheel cant soak up the vibrations as well as a heavier one.

This may not happen in your case, but with my setup there is a bit of vibration from a stop in first, but I can drive around it for the most part by not staying on the friction point very long when starting.

Dan
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Old 04-10-2004, 04:10 PM   #8
Kevin Thomas
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Default Re: Gains from weight-reduced pulley and lightweight flywheel?

Quote:
Originally posted by JonofScio
There's a stock dimensions weighed reduced Perrin pulley (1.2lbs over 5.2lbs stock) and of course I can grab a lightweight flywheel too, what sort of gains am I looking at? EJ22E N/A. No exhaust mods. Intake and electrical.
Hello John,

When my OBS was N/A (it's back N/A now) and I had the pulley installed, my 1/4 mile times at the dragstrip was dropped .2 - .3. My trap speed increased 2-3mph. I have an auto.

Using a G-Tech Pro that I used to have, I posted this info on an old site of mine:
Subaru Outback (2.2L):

"My average runs before the pulley came out to 17.3@78.9 MPH. Then I changed my pulley and made four runs averaging 16.9@82.15 MPH. Did you hear me? I shaved almost 1/2 second off my time just changing my pulley!"

Kevin"

Unorthodox Racing took my quote off of my site (Subaru Information Webpage) and added it to their Testimonials section. It's funny because I never believed the testimonial sections of any site.

http://www.unorthodoxracing.com/testimonials.html
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Old 04-16-2004, 04:12 AM   #9
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Quote:
Originally posted by m750
I just had the exedy fw, clutch, sti motor and tranny mnts put in. It's hard to tell the difference, as I was babying it w/ a slipping clutch. I don't notice much of a difference, but I don't drag or auto-x any more.
AO
I replaced my flywheel before I did the STI mounts. I've already told you how the flywheel went (with stock clutch) but the mounts didn't do **** for drivetrain lash. The only thing they did was make my shifter rock solid! It's just insane how much play were in the stock mounts.

The stock mounts are made from a gummybear type rubber. I could easily flex the damn thing with my bare fingers while the STI mounts were so hard that I could barely make a tiny indentation while giving it alot of pressure.

The shifter response is the best part. If you thought the change from the stock rubber shifter bushing to urethane bushing made a hugh difference in shifter feel, then you honestly cannot imagine how much of a leap ahead is the difference when doing the STI mounts. I honestly cannot flex the shifter more than a millimeter when I try to force it side to side. The stocker would go half an inch at least, if not more.
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Old 04-16-2004, 06:37 AM   #10
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I'm not too sure that the lighter pulley and lighter flywheel really make a difference at all. I have a friend with a 01 RS with the following mods:

Brullen SS exhaust
Injen CAI
N1 Lightend pulleys
Exeddy clutch
Exeddy Lightened flywheel

Mods on my 01 RS
Cobb CAI

Now we ran eachother a few times but nothing really serious. We didn't launch any of the times, so its a fairly good test of what kind of power gains you can expect. It basically came down to who started moving first. Neither one of us ever pulled on the other, and it was dead even the whole time. So, I'm not sure they really make a difference. Sure his car revs faster, but i think because of the torque that is lost in his set up I'm able to stay right with him. IMO. But alas. i will be buying my new pulley set on friday.
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Old 04-16-2004, 09:14 AM   #11
m750
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Quote:
Originally posted by obyone
I replaced my flywheel before I did the STI mounts. I've already told you how the flywheel went (with stock clutch) but the mounts didn't do **** for drivetrain lash. The only thing they did was make my shifter rock solid! It's just insane how much play were in the stock mounts.
I agree, this seems to be peoples recomendation to cure that, but I honestly think it's got alot to do with a low geared, high compression, low reving motor. You will get lots of Engine braking and therefore if you aren't smooth, lashing. IMHO.


Quote:
Originally posted by obyone
The stock mounts are made from a gummybear type rubber. I could easily flex the damn thing with my bare fingers while the STI mounts were so hard that I could barely make a tiny indentation while giving it alot of pressure.

The shifter response is the best part. If you thought the change from the stock rubber shifter bushing to urethane bushing made a hugh difference in shifter feel, then you honestly cannot imagine how much of a leap ahead is the difference when doing the STI mounts. I honestly cannot flex the shifter more than a millimeter when I try to force it side to side. The stocker would go half an inch at least, if not more. [/b]
What I have noticed besides the additional vibration, is the shifter is more solid, doesn't herk / jerk when acceling, and starting or stopping. Which I like alot.
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Old 04-16-2004, 11:56 AM   #12
Compressed
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I would agree that the biggest benefit from the mounts is in shifter feel. Rock solid as everyone else has testified. However, I have noticed that my car is a bit easier to drive at very low rpms in first or second. Basically when I'm creeping the car in traffic I can move the car with small throttle inputs more easily, and without using the clutch as much.
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