Welcome to the North American Subaru Impreza Owners Club Sunday September 21, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Transmission (AT/MT) & Driveline

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 07-09-2012, 11:36 PM   #1
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default 2011 WRX: Blown 5 Speed -> PAR Gears

Update: Switched to a straight cut second gear mid October. More info HERE

Quote:
Input shaft (with straight cut 1st and 2nd), 2nd gear, and 3rd gear synchro cone from PAR.



Gears assembled into the case. Didn't take any photos of the synchros before install.



Background:

My car is a 2011 WRX with a Blouch 20G XT-R. It is tuned on E85 and made 462WHP / 492WTQ. I have been running the 20G XTR for 8-10k miles. Originally I was at around 22-24psi and making just over 400WHP. My motor blew over the winter so I swapped in a built short block. When I did this I also increased the boost to about 27psi peak (this is the boost level I was at for the dyno results above). Once I got to this point the clutch started slipping, even with the ACT HD pressure plate, ACT full face organic disk, and ACT flywheel. I decided I had no choice but to go with a new clutch. I swapped the disk from the full face disk to an ACT 4 puck sprung disk. I really wanted to avoid this type of setup for the sake of my tranny, but with the other setup slipping, I went with it anyways. Here's more info on the car:

http://forums.nasioc.com/forums/show....php?t=2078765





With the puck clutch setup and the torque I was making, I knew it was only a matter of time before the tranny went out. It lasted through the winter and all was going pretty well. A couple weeks ago I went to the road course. I did a warm up session and everything was going fine. I made it through about half a dozen laps during the first full speed session. During the track day I was not flat foot shifting, or slamming the gears. I did not have any mis-shifts. I just came out of a turn in 3rd gear and when I put the pedal down it just let go completely and the car revved like it was in neutral. It sounded like a tin can full of loose change.

I pulled the tranny drain plug and found a bunch of teeth stuck to it. When the fluid drained out I got a few more. Here are some photos:







I had been researching my options and looking at what was available. I eventually ruled out the 6 speed because of the added cost and complexity of doing the complete swap. I then began looking at built 5 speeds. Unfortunately the 08+ WRX's use a 3.9 final drive, so it's not quite as easy as just swapping in a new tranny. This left me with the option of buying a tranny and having it disassembled and swapped over, or just buying a gearset.

After looking around I decided to go with just a gearset. I would like to thank Andrewtech, PAR, and the gear seller, Joe, and my mechanic, Vandde, for all the help along the way. Andrewtech and PAR were very helpful for someone who was trying to do research. Joe went above and beyond in getting me the parts and answering questions. Vandde and PAR helped out getting everything assembled correctly. Also thanks to Derek and my brother for the help removing (Derek) and installing (my brother) the tranny!

Also, I did read the thread about the PAR input shaft failing with relatively low miles. From what I can tell, that is an isolated indecent. Andrewtech had nothing but good things to say about the PAR 650HP gearset and still recommended it to me over PPG's even after that failure. I am very fortunate to find a set in the condition that I did.
* Registered users of the site do not see these ads.

Last edited by xluben; 12-10-2012 at 12:34 PM.
xluben is online now   Reply With Quote
Old 07-09-2012, 11:37 PM   #2
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Now, onto the swap! First, pulled the tranny for the rebuild:



Here are some photos of the stock (broken) gears:







And you can see that there is some wear on 1st gear:


Last edited by xluben; 12-10-2012 at 12:32 PM.
xluben is online now   Reply With Quote
Old 07-09-2012, 11:37 PM   #3
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Now, here are the PAR Gears:









The PAR gearset comes with a straight cut 1st gear and helical 2nd-4th. 5th gear is OEM. The ratios are as follows:

Code:
Gear	Stock Ratio	PAR Ratio
1	3.166		3.180
2	1.882		1.850
3	1.296		1.310
4	0.972		0.950
5	0.738		0.738
FD	3.900		3.900
Using those ratios, this calculator gives the approximate vehicle speed by RPM. It is not perfectly accurate, but should give a good estimation on the difference between the gearsets. The difference is quite small. 1st-3rd are within about 1mph of stock and 4th is a few mph's faster.

Stock:

http://www.car-videos.net/tools/spee...B1=Recalculate

PAR:

http://www.car-videos.net/tools/spee...B1=Recalculate

Code:
Gear	Stock MPH @ 7k	PAR MPH @ 7k
1	40.7		40.6
2	68.5		69.7
3	99.5		98.5
4	132.7		135.8
5	174.8		174.8
I think this is a good match for my powerband. I don't find myself needing the close ratio's of the 6 speed, so my preference was for keeping the longer 5 speed gears. The slightly taller 4th should be plenty for the 1/4 mile unless I make the car considerably faster (stock 4th would also have been OK, but this is more headroom).

Comparison Photos:







The tooth size and profile of the PAR gears is much larger than the OEM gears. They look great. Everything appears to be in excellent condition. The straight cut first gear whines quite a bit (just like reverse). It is quite a head turner in parking lots! I'll have to try and get a video of this soon.

Here it is all cleaned up and assembled. Ready to go back in.



So far, so good. It's only been in for a few days now, but it's all running smoothly. Nice solid whine in first gear, but the rest is pretty stock-like. Overall it is a little noisier, but not much. It drives very nicely and shifts smoothly (like a synchro tranny should). I'm hoping it can hold up to the power, unlike the stock gears!

Last edited by xluben; 12-10-2012 at 12:32 PM.
xluben is online now   Reply With Quote
Old 07-09-2012, 11:38 PM   #4
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Here is a video from the track when 3rd gear actually failed.


I'll try to get a video with the new gears sometime soon!

Here's a quick video of me running through the gears. You can hear the whine in 1st


Last edited by xluben; 12-10-2012 at 12:32 PM.
xluben is online now   Reply With Quote
Old 07-09-2012, 11:52 PM   #5
Celery GT-5
Scooby Guru
 
Member#: 98210
Join Date: Oct 2005
Chapter/Region: Tri-State
Location: Upstate NY
Vehicle:
2015 WRX Premium 6MT
WRB

Default

nice work jerk

so how strong are these?
Celery GT-5 is offline   Reply With Quote
Old 07-09-2012, 11:59 PM   #6
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Quote:
Originally Posted by Celery GT-5 View Post
nice work jerk
Thanks?

Quote:
Originally Posted by Celery GT-5 View Post
so how strong are these?
They're rated at 650HP. Hopefully they last.

http://www.par-engineering.com/secti...ru&sectionId=2
xluben is online now   Reply With Quote
Old 07-10-2012, 12:01 AM   #7
Celery GT-5
Scooby Guru
 
Member#: 98210
Join Date: Oct 2005
Chapter/Region: Tri-State
Location: Upstate NY
Vehicle:
2015 WRX Premium 6MT
WRB

Default

nice, so were you really gonna trade in the car or was it just a trick again?
Celery GT-5 is offline   Reply With Quote
Old 07-10-2012, 04:53 AM   #8
Gregor91
Scooby Specialist
 
Member#: 259434
Join Date: Sep 2010
Chapter/Region: South East
Vehicle:
2012 wrx sedan
SOLD :/

Default

nice xluben.. the par gears look like they can hold some power... teeth look like they are double the size of the factory ones
Gregor91 is offline   Reply With Quote
Old 07-10-2012, 12:07 PM   #9
besthaticouldo
NASIOC Supporter
 
Member#: 279660
Join Date: Apr 2011
Chapter/Region: MWSOC
Location: STL
Default

damn dude...i love my 5spd, i feel no need for a 6er. so this seems to be a great option i think.
besthaticouldo is online now   Reply With Quote
Old 07-10-2012, 08:11 PM   #10
kyletakahero
Scooby Specialist
 
Member#: 185030
Join Date: Jul 2008
Chapter/Region: AKIC
Location: Anchorage, AK
Vehicle:
2003

Default

Glad to see this monster up and running again.
kyletakahero is offline   Reply With Quote
Old 07-10-2012, 08:16 PM   #11
96accord
Scooby Guru
 
Member#: 145105
Join Date: Apr 2007
Chapter/Region: MAIC
Location: Middle River, Maryland
Vehicle:
2015 WRB WRX Limited
2007 WRX Limited (sold)

Default

Quote:
Originally Posted by kyletakahero
Glad to see this monster up and running again.
This!
96accord is offline   Reply With Quote
Old 07-10-2012, 08:38 PM   #12
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Quote:
Originally Posted by Celery GT-5 View Post
nice, so were you really gonna trade in the car or was it just a trick again?
Trick.

Quote:
Originally Posted by Gregor91 View Post
nice xluben.. the par gears look like they can hold some power... teeth look like they are double the size of the factory ones
I hope so. The teeth are quite large.

Quote:
Originally Posted by besthaticouldo View Post
damn dude...i love my 5spd, i feel no need for a 6er. so this seems to be a great option i think.
As long as it lasts. I do like the ratios.

Quote:
Originally Posted by kyletakahero View Post
Glad to see this monster up and running again.
Quote:
Originally Posted by 96accord View Post
This!
Me too.
xluben is online now   Reply With Quote
Old 07-10-2012, 08:44 PM   #13
BigRob74
Scooby Specialist
 
Member#: 305107
Join Date: Dec 2011
Chapter/Region: Tri-State
Location: Long Island, NY
Vehicle:
2012 wrx
360/386 E85

Default

awesome! you must be pretty happy to get her back up and running!
BigRob74 is offline   Reply With Quote
Old 07-10-2012, 08:46 PM   #14
WRB19
Scooby Specialist
 
Member#: 302898
Join Date: Dec 2011
Location: Wyoming/Arizona
Vehicle:
2014 Focus ST
Race Red

Default

If you dont mind me asking how much did you pay for the gearset + all the labor?
WRB19 is online now   Reply With Quote
Old 07-10-2012, 10:44 PM   #15
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Here's a quick video of me running through the gears. You can hear the whine in 1st

xluben is online now   Reply With Quote
Old 07-11-2012, 12:53 AM   #16
kevosti
Scooby Newbie
 
Member#: 269463
Join Date: Jan 2011
Location: Broken Arrow, OK
Vehicle:
2012 WRX STi Sedan
DGM

Default

Why straight cut 1st gear instead of helical?
kevosti is offline   Reply With Quote
Old 07-11-2012, 07:59 AM   #17
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Quote:
Originally Posted by kevosti View Post
Why straight cut 1st gear instead of helical?
Straight cut 1st gear for minimal thrust loads when launching at full power. This protects the thrust bearings supporting the transmission shafts from the shock loads experienced during hard launches, especially when using puck type and multi-plate/rigid center clutch assemblies.
xluben is online now   Reply With Quote
Old 07-11-2012, 08:23 AM   #18
abrumlev
Scooby Specialist
 
Member#: 197920
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Indiana
Vehicle:
2005 Legacy GT
ABP

Default

Would you be opposed to throwing a Moore Performance 5spd brace on the transmission? I think that ~300 would be well spent to help combat case flex.
abrumlev is offline   Reply With Quote
Old 07-11-2012, 09:22 AM   #19
WRXinpa
Scooby Specialist
 
Member#: 306708
Join Date: Jan 2012
Chapter/Region: MAIC
Location: Philly
Vehicle:
2012 WRX Hatch SWP
TP Stage 2

Default

Quote:
Originally Posted by WRB19 View Post
If you dont mind me asking how much did you pay for the gearset + all the labor?
+1

I have gotten used to the 5 spd after coming from a 6 spd and wouldn't want to go back. With the power you've got, a 6 spd shouldn't make the car any faster around the track. This is a good alternative to doing a full 6 spd swap. Awesome pictures
WRXinpa is offline   Reply With Quote
Old 07-11-2012, 09:37 AM   #20
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Quote:
Originally Posted by abrumlev View Post
Would you be opposed to throwing a Moore Performance 5spd brace on the transmission? I think that ~300 would be well spent to help combat case flex.
I'm not opposed to it, but the time for doing that is kind of past, lol. I had a hard time convincing myself it would make much of a difference. Hopefully that doesn't come back to bite me...

Quote:
Originally Posted by WRB19 View Post
If you dont mind me asking how much did you pay for the gearset + all the labor?
I would contact Andrewtech and/or your shop for rates. The PAR gearset is around $4500 from Andrewtech. I pulled and installed the tranny myself, so that saved some costs, but if you're having a shop do all the work, then I would just get a quote from them.

Quote:
Originally Posted by WRXinpa View Post
+1

I have gotten used to the 5 spd after coming from a 6 spd and wouldn't want to go back. With the power you've got, a 6 spd shouldn't make the car any faster around the track. This is a good alternative to doing a full 6 spd swap. Awesome pictures
Yeah, I like the 5 speed gearing. As long as this holds up I will be happy with the setup.
xluben is online now   Reply With Quote
Old 07-11-2012, 01:03 PM   #21
Samurai Jack
Scooby Specialist
 
Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
Vehicle:
2002 Enemy of Aku

Default

Quote:
Originally Posted by abrumlev View Post
Would you be opposed to throwing a Moore Performance 5spd brace on the transmission? I think that ~300 would be well spent to help combat case flex.
$399 USD
Samurai Jack is offline   Reply With Quote
Old 07-11-2012, 01:07 PM   #22
MattyTee
Scooby Newbie
 
Member#: 315355
Join Date: Apr 2012
Chapter/Region: Tri-State
Location: Webster, NY
Vehicle:
2012 WRX Limited
SWP

Default

Very cool write up, vids and pics. I've been enjoying your setup vicariously since I will likely never have the cash or balls for that level of modding. Cheers!
MattyTee is offline   Reply With Quote
Old 07-11-2012, 01:27 PM   #23
jprice130
Scooby Newbie
 
Member#: 288225
Join Date: Jul 2011
Chapter/Region: South East
Location: Harrisburg, NC
Vehicle:
2013 BRZ
DGM

Default

Oh my goodness....That video of you running thru the gears is proof positive that the PAR gears have found their proper home. Just sick man....congrats!
jprice130 is offline   Reply With Quote
Old 07-11-2012, 02:14 PM   #24
Pearldrummer7
Scooby Newbie
 
Member#: 277514
Join Date: Mar 2011
Chapter/Region: Tri-State
Location: NY
Vehicle:
2012 WRX

Default

looks great! those gears should be pretty indestructible, even at 450+ hp.

I thought I recognized this car from somewhere....2011-12 picture thread!

1.850 for 2nd gear....what can you hit in 2nd, then? about 70? the video was a little hard to tell from. The straight cut sounds fantastic!

nevermind:The difference is quite small. 1st-3rd are within about 1mph of stock and 4th is a few mph's faster.
nice work


didn't catch that part.

nicely done!
Pearldrummer7 is offline   Reply With Quote
Old 07-11-2012, 02:45 PM   #25
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX Sedan
10.9s @ 126mph

Default

Quote:
Originally Posted by MattyTee View Post
Very cool write up, vids and pics. I've been enjoying your setup vicariously since I will likely never have the cash or balls for that level of modding. Cheers!
I had never worked on a car before this one. Just go for it!

Quote:
Originally Posted by jprice130 View Post
Oh my goodness....That video of you running thru the gears is proof positive that the PAR gears have found their proper home. Just sick man....congrats!
Thanks again! I'm really liking them!

Quote:
Originally Posted by Pearldrummer7 View Post
looks great! those gears should be pretty indestructible, even at 450+ hp.

I thought I recognized this car from somewhere....2011-12 picture thread!

1.850 for 2nd gear....what can you hit in 2nd, then? about 70? the video was a little hard to tell from. The straight cut sounds fantastic!

nevermind:The difference is quite small. 1st-3rd are within about 1mph of stock and 4th is a few mph's faster.
nice work

didn't catch that part.

nicely done!
Yeah, the gearing is very similar. Should be close to 70mph if I rev to 7k. I was only going to about 6.5k in the video.
xluben is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 01:34 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.