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Old 04-21-2002, 12:53 PM   #1
thermite
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Question Type RA trans swap

First off I know nothing of transmissions. So please let try to keep the "your a dumbass" comments to a near minnimum

Ok, I race in the quarter with my WRX. I do compete as well and do have 2 first place victories to show for it. I have heard that the people with the type ra's can get some mad 60' times as well as 11 second or lower quarter miles. I would like to do the same. Is it possible to put the type ra transmission in the WRX and how easy is it. Also what are the drawbacks of having one? I do know obviously top speed would be lower with the lower gears. Would I still be able to drive my car on the street or would it just be a track car?

I tried a search but didnt find much. If anyone has some ideas please let me know.

Thanks,

thermite
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Old 04-21-2002, 04:42 PM   #2
joltdudeuc
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type RA is STi 6 speed i think (mmmmmmmmmmm... 6 speed)

and the drawback is: Good luck finding one, and Price... $7000 (or more)



Great, awesome, just ****in sick as hell Tranny, BUT man it's expensive and hard to get... (only in Japan)

-Gagan
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Old 04-21-2002, 05:55 PM   #3
thermite
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arnt the gear ratios different than the standar STi which is why people get mad quarter mile times but low top speed. I could care less about the top speed honestly as long as I can do at leats 90. If I happen to find an STi Type RA transmission is that all I need or are there other things, differential etc?

Glen
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Old 04-22-2002, 01:38 AM   #4
CrustySTi
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The original WRX has had an RA version right from the start (1992) This is a five speed box with closely stacked ratios and a fifth ratio close to the standard cars forth !! So.... very quick off the mark and very noisy motorway cruising... I removed the RA box from my car when i fitted the STi-3 engine to make the car less frantic during normal street driving.. yes the RA was crazy accelerating but you have to factor in lots of extra gear changing into your times !! plus i found you'd always need to change up a gear right in the middle of a corner I enjoy the car so much better with the tall ratio box and it uses quite a lot less gas. In my thinking all i needed to overcome the taller gearing is more power
> Mark.
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Old 04-23-2002, 01:47 PM   #5
thermite
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Heres the way I can see it. STI Type RA trans/drivetrain / upgraded turbo / fuel system / exaust / uppipe / CAI / BOV / unichip / boost controller / lots and lots of boost = 10s in the quarter. I know a type ra will run 11s stock. So with all the mods im sure itll run mad fast. Please let me know. Probly run very consistent quarter mile times as well. Thats what im interested as I bracket race.

Glen
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Old 04-23-2002, 05:41 PM   #6
garface
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Can you show me where you saw that RA's run 11's stock? I would guess high 12's. As far as you running 10's, I really, really doubt you'll ever do it. Do a search on Rigoli, they broke into the 9's in a street daily driven GC8 WRX and might be able to give you some ideas of whats necessary. Axles and upgraded diffs would probably be good ideas too. Good luck.
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Old 04-23-2002, 06:51 PM   #7
CrustySTi
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A stock '92~'96 RA (non STi) will run a 13.1 quarter, not sure about the '97~'00 model but they are heavier and more powerful.... so still similar times... NO Subaru will run 11's stock... you'd need 400+ FWHP to achive this, not 240~280 !! Keep saving....
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Old 04-23-2002, 06:59 PM   #8
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ok how about this
change your differntials to lower your final drive ratio
oh yeah and the parts can be had in your local junk yard...

wrx is 3.90 right?
rs is 4.11
i was under the impression that there is a 4.44 out there some where
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Old 04-23-2002, 07:26 PM   #9
garface
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Auto RS's have 4.44 rears. Other auto's probably do too.
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Old 04-23-2002, 08:44 PM   #10
thermite
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So what causes people who have a type ra to get like a 1.6 60' time. Maybe its just me but coulnt you gain more by messin with gear ratios/differentials and then go with the other supporting mods to make it even quicker. In other words I want those 1.6 60' times, what can I do?

Glen
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Old 04-23-2002, 10:02 PM   #11
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Hi guys,

Been reading this thread with interest as I have a ver. 4 RA.

There are many differences between these and a standard WRX that give it impressive qtr mile times.

4.444 diffs, LSD rear and centre, aluminium bonnet, boot and suspension, no air con, no pwr windows and mirrors, different gear box ratios, different cams, heads, turbos etc etc.

My car has run a 12.3 @113MPH with the following mods only.

Ceramic clutch, K&N filter panel, 2.5 inch muffler. The main draw back with qtr mile times is I have to change to fifth before the end of the qtr.

I think with very minimal work it would be fairly easy to get an 11.

Cheers

Blair
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Old 04-24-2002, 01:02 PM   #12
garface
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Womble, what etc etc exactly?
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Old 04-25-2002, 11:59 AM   #13
mvanthorre
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I can get 6spd ra trannies. Have three here in Colorado right now. Unfortunatly they are all sold.

Marshall
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Old 04-25-2002, 12:04 PM   #14
nmyeti
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Quote:
Originally posted by thermite
So what causes people who have a type ra to get like a 1.6 60' time. Maybe its just me but coulnt you gain more by messin with gear ratios/differentials and then go with the other supporting mods to make it even quicker. In other words I want those 1.6 60' times, what can I do?

Glen
You understand that the type RA is a stripper right? There is the asnwer to your question. It gets better 60 foot times because it is lighter thereby have less mass to get moving off the line.

Whats the big deal with 1.6 60 foot times? Heck on my stock tires i managed 1.71 in my WRX. Add in a two step and i think i can get a bit better hook than that...

-Nathan
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Old 04-25-2002, 10:41 PM   #15
William LaPalme
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Hasn't anyone considered that MRT sells straight cut gears that fit in our case syncro free for around 3500$. They work with you on gear ratios, and have gearsets for quarter mile.(which is wierd since they don't measure in miles. So to any non-american out there, what is quarter miling called, elsewhere?)
The reason I mention this is that they get 12% or more hp increase to the ground just because of lower friction.
And feel blessed, the Porche GT2 2WD tranny is 15000$US. And Supra's racing boxes are up toward 20000$US
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Old 04-25-2002, 11:33 PM   #16
preza
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Quote:
Originally posted by William LaPalme
Hasn't anyone considered that MRT sells straight cut gears that fit in our case syncro free for around 3500$. They work with you on gear ratios, and have gearsets for quarter mile.(which is wierd since they don't measure in miles. So to any non-american out there, what is quarter miling called, elsewhere?)
The reason I mention this is that they get 12% or more hp increase to the ground just because of lower friction.
And feel blessed, the Porche GT2 2WD tranny is 15000$US. And Supra's racing boxes are up toward 20000$US

So your saying on a relativly stock WRX, just switching to the MRT gears will get a 20awhp increase. That seems hard to believe
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Old 04-26-2002, 02:33 PM   #17
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I dont know about that much-possible though I guess. But with straight cut gears you will see more wheel hp because they are more efficient.

Ken
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Old 04-26-2002, 04:32 PM   #18
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Quote:
Originally posted by garface
Auto RS's have 4.44 rears. Other auto's probably do too.
there ya go .. if the rear is 4.44 then front is too...
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Old 04-28-2002, 09:13 PM   #19
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Quote:
Originally posted by garface
Womble, what etc etc exactly?
Closed deck block, intercooler, drive shafts, injectors, fuel pump, ECU plus various interior parts.

Too many differences to list really.
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Old 05-11-2002, 08:30 AM   #20
supermoose
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Default RA gearboxes

word. which ra box do u want? 6 or 5 speed. 6 is a motherbuttload of money more.

im guessing u want a 5 box. with the 4.44 gear ratio. iirc u can do it 2 ways.

obviously u buy the gearbox. ~ $700, it should bolt into your front axels and stuff w/o any issues. drive shaft is same, differiential has 2 choices.

normal subaru uses habatchi(wrong spelling) R-160 unit. STI uses R-180 unit. R-180 is supposedly same as RX-7(fc) and S13/14 silvia. its bigger and stronger for more power/abuse as in the RWD only cars it comes in.

from my understanding to use R-180 rear diff, u need rear STI subframe bc its got differnt mounting. also bigger axels, that nessitates bigger hubs to fit the axels. so basically u can do the whole rear bottom suspension swap. subframe, diff, axels, hubs, rear 2 piston brakes!!, ebrake setup etc.

probbly cost u mab~$1500 for the parts? i dont know exactally, i dont know prices for rear end parts well.

the other easier way is to use the R-160 unit from an automatic subaru with a 4.44 LSD. that way u just bolt it in, connect everything and its lovely. $350 at world auto parts in so-cal. ask for mike. downside is lack of durability for long term abuse i would guess. also less pimp factor bc u dont have the rear 2 pot brakes, or the STI rear crossmember parts.

swapping the crosmembers is easy, i would probbly not do it unless u got a deal on the whole driveline/rear end setup, bc u have a new car.

i am pondering doing the 4.44 conversion with the R160 rear end. cheaper, and i just converted my FWD to a AWD rear end, so i know how much labor it takes.

correct me if im wrong, thats my .02

peace

h
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Old 05-11-2002, 12:41 PM   #21
thermite
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Quote:
Whats the big deal with 1.6 60 foot times? Heck on my stock tires i managed 1.71 in my WRX. Add in a two step and i think i can get a bit better hook than that...
nmyeti - Have you or anyone that you know of figured out a way to make the MSD or any other kind of two step rev limiter? I have emailed MSD with not good results other than they need an ignition diagram to see if it works on our cars? I have posted about the MSD and not had alot of results other than noone can figure it out and the way it works.

Any ideas?

thermite
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