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Old 08-20-2013, 09:37 AM   #301
charliew
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You need to figgure out where the power band is in the motor and try to keep the motor in that range throughout the track. For 3/4 mile I'm thinking you will be in 5th wide open before it ends. So I think a close ratio will get you up to 5th as quick as possible and let the motor wind up as fast as possible. My son's sti is NOT a good 1/4 mile car as he has to shift right in front of the lights at the end, that kills his time but it's a great road car. Launching is hard in awd it usually requires some cluth feathering to come out of the hole because the tires get great traction. The only other option is launching at 7k and trying to keep the tires spinning which very hard on the driveline and clutch. Either way the clutch is the weak link till you get over 400whp. Soooo the lowest gear is the easiest on the driveline for just dragracing but bad for the street.

I reread your question and realized you are a 5 spd. still lowest to live with on the street is best for dragracing on the track but bad for the street.
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Last edited by charliew; 08-20-2013 at 09:56 AM.
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Old 08-20-2013, 09:51 AM   #302
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Problem is you will top out the JDM 6-speed in a 3/4 mile. The top gear is just too short.
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Old 08-20-2013, 10:02 AM   #303
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Not sure if 350 awd hp will pull 7k in top gear I never tried one out. Thats actually good, that means he can run taller gears for the street and plan for max rpms at 3/4 mile. I'm guessing whatever rpms it will turn in 4th will be all he can hope for in 5th at wot. I may have got here late, sorry if he is using a jdm6spd I don't know about that. In 3/4 mile thats just a better way to get there quicker but close ratio will help a weaker motor wrap up quicker. He could probably get as close as possible then swap tires some. probably about the time he gets the ratio close he will want more power and start over. The chart says he has 3:70 fd with the 5spd so it will be higher than the jdm fd.

Last edited by charliew; 08-20-2013 at 10:13 AM.
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Old 08-25-2013, 08:48 PM   #304
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Quote:
Originally Posted by marcng View Post
Hi Guys,currently my car is running 350whp revving to 7000rpms on a built 2.5L, what kind of gearset do u recommend for my MY07 2.5wrx so that it can be a fast 3/4 mile drag.Yes 3/4Mile,u didnt hear wrongly,a drag strip in my country..
im using six speed,would a jdm close ratio or a spec b ratio will be best for me..
Thanks in advance..
Drop in the long gears in the 6spd and you'll run through 5th. The longer 2/3/4 will help you move through the 1320 quickly and 5th will take you the rest of the way.
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Old 08-26-2013, 08:25 AM   #305
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Question
What rear dyff from WRX has the same final drive as one of the STI transmissions?

I want to buy a STI transmission and keep my 5x100 rear WRX hubs.
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Old 08-26-2013, 11:05 AM   #306
FuJi K
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Quote:
Originally Posted by subarufan555 View Post
Question
What rear dyff from WRX has the same final drive as one of the STI transmissions?

I want to buy a STI transmission and keep my 5x100 rear WRX hubs.
02-05 - 3.545
08-current - 3.900
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Old 09-01-2013, 06:47 PM   #307
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I have a 2002 wrx wagon with a blown 1st gear,I picked up a used trans on cl for a good deal after looking at the trans code I noticed it was a 2.5rs tranny. One is a pull type and one is a push type for the trow out bearing. I was wondering if I can put the gears out of the 2.5rs into the wrx housing. If so can I keep the wrx center diff? Or swap everything and run the 4.11 rs rear diff?
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Old 09-01-2013, 07:13 PM   #308
FuJi K
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Swap out the pinion gear from your WRX gear set to the RS gear set. Check back lash and go.
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Old 09-01-2013, 07:44 PM   #309
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Check back lash with plastiguage? What is within spec?
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Old 09-01-2013, 07:57 PM   #310
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Youll need a dail indicator and oem spec.
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Old 09-02-2013, 03:47 AM   #311
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Quote:
Originally Posted by FuJi K View Post
WRX - FD
02-05 - 3.545
08-current - 3.900
STI - FD
04-05 - 3.90
06-present - 3.545
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Old 10-19-2013, 12:51 PM   #312
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Great information thanks for all of the dialouge

I'm thankfully an owner of a 2003 Subaru WRX Bugeye unfortunately roughly a month ago timing belt went at 73000 miles, I am not the original owner so am unaware of weather this had been done and had been informed that typically they go out to 100000 miles.

Of course this is all heresay as I'm past all that and on to 1 month out of the vehicle local mechanic shop has rebuilt the top end, Heads have bent sent everything is backing new timing assembly, etc.

In the mean time the mechanic recammended replacing the Clutch and Flywheel so I ordered 2002-2005 Excedy Organic Stage 1 Kit & lightweight flywheel from Exceedy as well. Upon instal the mechanics have been puzzled with the engagment of the clutch assemble, everything is suposedly installed properly, but they had to modify the arm that acuates because it wasn't long enough to disengage the cluthch with the stock one.

The clutch pedal engages close to the floor without much play, does not feel normal in comparisson to the stock one, in addition im getting a check in engine light and a boost lag or inlet lag I can push the gas pedal and hear spooling but almost like bleed air pressure not engaging enough to transfer to full engine power. The code reflects a malfunction with the Tumble Generator Sensor does anyone have any

Does anyone have experience with these clutches or have any advice?
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Old 10-25-2013, 06:59 PM   #313
FuJi K
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^^^ if things where done right, none of that should have happened. No modification needed at all. No bleeding.
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Old 10-30-2013, 11:00 AM   #314
xHairyBuffalo
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I have a 2010 WRX running 463 at the wheels on the stock 5 speed, which is about to fall apart. I found a 2012 STi gearbox for sale in great condition, and I want to make sure everything will fit before I do the swap. So please correct me if I am wrong and let me know if this will work:

2012 STi gearbox
STi clutch
STi driveshaft
04 WRX rear diff
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Old 10-30-2013, 08:23 PM   #315
FuJi K
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^^^^
Yes. Remember to figure out your clutch slave cylinder.
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Old 11-21-2013, 07:07 PM   #316
FuJi K
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Exactly what most people are looking for. Them longer gears.
Drives like a 5spd with a highway gear. Long gears of the 6spd.

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Old 11-21-2013, 07:14 PM   #317
manitou
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That's right about where my revs are in 6th with my 07 6 speed gearing and my tall 26.7" tires!
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Old 12-22-2013, 02:54 PM   #318
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very great sticky FujiK.. but like what was said in my post. stuff will still break eventually. ive seen 6spd's break with less power than my 430whp/410wtq..and yet ive seen the 6spd's hold 5xx-low7xx... so idk. i might still go with PAR's650. and just hold off and do the 6spd in my bugeye after i graduate in the spring with my chemistry degree. lol.
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Old 12-22-2013, 03:17 PM   #319
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also FujiK, i will be upping the fuel and more boost in the spring, shooting for high4xx low5xxhwp. after reading ur thread again, i was thinking about leg specB 6spd, for the strength and longer gears to really see the power/acceleration on the interstate.

-car is 05 built hybrid 2.0/2.5 with bpt20gxtr w/10cm dual bb.

this is my DD, so i never been to the drag strip or autox nor any time attack laps like Road Atlanta. but i do go to the Tail of the Dragon about least 2-3times a year. that is wass i was talking about PAR650's 5spd gear set with (1-4 straight cut) so i can downshift to 1st or 2nd depending on which curve and not be in the top range of the gear. almost having to shift immediately. but rather the longer gears i could downshift and have plenty of room to boost and build/push back up the rpms before shifting again.

also why i stated in my other thread price kind of sways me one way or other, is bc i have new 18x10.5" 5x114 wheels and front and rear brembo's to install. so if i do the PAR gear set then i would have to buy project kics 11-12mm wheel adapters ($350ish) and the rear brembo adapter and rotor/ebrake kit ($450ish). so im looking at an additional 800-1k gotta spend

but if i do the 6spd swap with evything from r180, and stronger hubs/wheel bearings/spindles and etc to support the wide wheels and stress they will see up at the Dragon. and then the swap would already be 5x114 so i wont have to worry about buying wheel adapters nor rear bracket and pieces to make the brembos fit/install

thanks for all your info and advice you can give
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Old 12-23-2013, 01:38 AM   #320
FuJi K
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If you've seen the video in the beginning of the thread, you can see we only use gears 1-4 when running the 1320. We do the same with the long gears especially when running larger turbo setups that can still make power in the upper RPMs, which we just hold out 4th gear; ex the 9000rpm video, which runs a built 2.5L engine with head work and supporting mods.

The long gears, even shifting at 7000 RPMs, imo isn't bad at all. I think it should have came like that from when we got our STi in the U.S.

Broken 6spds can be from driver error/long term hard driving and or power output. We run our cars with the stock gears from Subaru. We touched the 9sec with the stock long gears. One could even do 9's with the short gears if pushed far enough but requiring more effort in driver and overall setup.

I do really like that the long gears you can cruise in lower RPMs, drive around town with little shifting yet still have even gear spacing for staying in the powerband. In addition is the smoother shifts that come with a 6spd, as long as it isn't so beat up from hard driving.

The 5spds are fine as long as have the stronger gears, fresh synchros, fresh hub sliders and shift forks. They are fine if you have the final drive to fit the application. I don't mind them at all. They have some ratios that i would love to mismatch to create a gear set that suits my driving needs!

In the end the 6spd won me over.
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Old 01-01-2014, 05:10 PM   #321
Hiryu
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Quote:
Originally Posted by FuJi K View Post
Exactly what most people are looking for. Them longer gears.
Drives like a 5spd with a highway gear. Long gears of the 6spd.

Quote:
Originally Posted by FuJi K View Post
If you've seen the video in the beginning of the thread, you can see we only use gears 1-4 when running the 1320. We do the same with the long gears especially when running larger turbo setups that can still make power in the upper RPMs, which we just hold out 4th gear; ex the 9000rpm video, which runs a built 2.5L engine with head work and supporting mods.

The long gears, even shifting at 7000 RPMs, imo isn't bad at all. I think it should have came like that from when we got our STi in the U.S.

Broken 6spds can be from driver error/long term hard driving and or power output. We run our cars with the stock gears from Subaru. We touched the 9sec with the stock long gears. One could even do 9's with the short gears if pushed far enough but requiring more effort in driver and overall setup.

I do really like that the long gears you can cruise in lower RPMs, drive around town with little shifting yet still have even gear spacing for staying in the powerband. In addition is the smoother shifts that come with a 6spd, as long as it isn't so beat up from hard driving.

The 5spds are fine as long as have the stronger gears, fresh synchros, fresh hub sliders and shift forks. They are fine if you have the final drive to fit the application. I don't mind them at all. They have some ratios that i would love to mismatch to create a gear set that suits my driving needs!

In the end the 6spd won me over.
Is this the high speed/spec B 6-speed gearset? I'm really looking for a taller gearing solution for a car that's using a 2005 USDM Subaru Powertrain but weighs a bit less and has a bit more power than a stock STi. The standard gearing is just way too short for daily driving.

Is the high speed gearset the way to go? I'm not really able to go to a taller wheel/tire, and even after all the research, I'm not sure if it's possible/feasible to swap to lower front/rear end ratios? Are there any other alternatives to get taller gearing?

As far as swapping to the high speed headset, my biggest concern is the durability; I've heard that the high speed gearset may not be as strong as the STi's sets... also, per Unabomber's thread, it sounded like taller gearing puts more stress on the drivetrain and can likewise cause more failures. Any concern and/or experience with this?

Great thread, and thanks for any help/advice-
Mike
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Old 01-03-2014, 08:01 PM   #322
FuJi K
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Quote:
Originally Posted by Hiryu View Post

Is this the high speed/spec B 6-speed gearset? I'm really looking for a taller gearing solution for a car that's using a 2005 USDM Subaru Powertrain but weighs a bit less and has a bit more power than a stock STi. The standard gearing is just way too short for daily driving.

Is the high speed gearset the way to go? I'm not really able to go to a taller wheel/tire, and even after all the research, I'm not sure if it's possible/feasible to swap to lower front/rear end ratios? Are there any other alternatives to get taller gearing?

As far as swapping to the high speed headset, my biggest concern is the durability; I've heard that the high speed gearset may not be as strong as the STi's sets... also, per Unabomber's thread, it sounded like taller gearing puts more stress on the drivetrain and can likewise cause more failures. Any concern and/or experience with this?

Great thread, and thanks for any help/advice-
Mike
We run these gears on 500whp+ cars that goes 10sec easy. If you're not making that much power, there shouldn't be any concern.

What's the application? Power? Engine size?
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Old 01-03-2014, 11:17 PM   #323
Hiryu
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Quote:
Originally Posted by FuJi K View Post
We run these gears on 500whp+ cars that goes 10sec easy. If you're not making that much power, there shouldn't be any concern.

What's the application? Power? Engine size?
Haha... I'll never be anywhere close to that. I'm currently at about 360bhp in a 2200-2500lb vehicle and don't plan to ever go over 450hp.

Also, is this the tallest gearset available short of going custom? Does anybody even make custom gearsets for the 6-speed?

This is great info, thanks.
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Old 01-04-2014, 09:52 AM   #324
FuJi K
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Quote:
Originally Posted by Hiryu View Post

Haha... I'll never be anywhere close to that. I'm currently at about 360bhp in a 2200-2500lb vehicle and don't plan to ever go over 450hp.

Also, is this the tallest gearset available short of going custom? Does anybody even make custom gearsets for the 6-speed?

This is great info, thanks.
What's your car built for? Daily driving?
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Old 01-04-2014, 02:25 PM   #325
Hiryu
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Originally Posted by FuJi K View Post
What's your car built for? Daily driving?
Primarily at this point, yeah. Right now, I tend to cruise around town in fifth gear, for example. I recently drove my cousin's stock 2003 WRX, and starting in first gear of that car reminded me of starting in third in my car.

I don't need to go 60mph in first, but it'd be nice to be able to get there in second--especially when you compare the gearing to other sports cars with the same power/weight ratio (some of which in fact do 60 in first). The high speed gears look like a nice improvement, but I'm curious if the ratios wouldn't still be a bit too short...
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