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Old 07-30-2008, 06:50 AM   #1
snvin
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Default Question about swaps & airbags...

In a situation where an STi engine goes into an earlier RS, and the RS interior remains intact, do the airbags still work?

I'm just not sure whether or not the airbags are controlled by the ECU, and if that's the case, if an STi ECU can control RS airbags.

Thanks. (I know it's probably a stupid question.)
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Old 07-30-2008, 08:02 AM   #2
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The SRS has it's own brain, it should be under the center console.
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Old 07-30-2008, 12:16 PM   #3
legacy2003
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^+1

Doing an engine swap won't affect your RS airbag system. Now if you did a dash swap you may run into some issues. You could still get those to work, but it'd take some work.
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Old 07-30-2008, 12:58 PM   #4
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yeah the airbags have there own separate system... i took apart my 95 impreza dash to do the ej20g swap. and im pretty sure all subarus are similar... but the airbag thing is in the middle... like under the cd player area...


i dont think they will connect the airbag to the ECU cuz people who use After market ECU... that might F-- everything up....

and yeah dash swap... u might wanna rewire everything....which i dont recommend...
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Old 07-30-2008, 01:32 PM   #5
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What they said. Keep your dash, keep your airbags.
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Old 07-30-2008, 03:08 PM   #6
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Alright. Thanks, guys.
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Old 07-30-2008, 03:44 PM   #7
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or run a different dash with corresponding airbags and wiring
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Old 07-30-2008, 04:09 PM   #8
snvin
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The car I'm looking at is an RS with an '06 STi swap. The RS dash and bags are intact. Somebody really good (well-known tri-state guy... Zepher) did the wiring.

Now that the airbags are out of the way, ( ) the next thing to ask about is the transmission.

He's got the RS 5MT in there with an upgraded (ACT?) clutch. Is that a good combo with the EJ25?

Thanks again, guys. I had an '04 WRX and I know the lingo there, but this swap business is new territory for me.
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Old 07-31-2008, 12:43 PM   #9
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I know that act isn't recommened by the guys down at ds1 i talk to. They have some beef with the company and exedy actually makes the newer wrx clutches and owns the patent on them...so if you own a wrx pull style exedy is the only way to go.

Bascially everyone in the swap world needs to know zephyr and im sure if you did a seach on the board you'd get over 500 hits on his name alone in bedded into threads.

Since you're running the stock rs trans with an sti engine. Expect great things. You launch hard, you're throwing out 1st gear no if's ands or buts. You're going to have to baby the thng if you want it o stand up. Otherwise get a hold of a few trans places on here Ds1 being one and getting yourself an mfactory gear set for a smooth $2600 installed, or baby your rs tranny and just enjoy rolling pulls and easier shifting...

however I'd really recommend getting a exedy lightweight and organic stage 1. The clutch and flywheel ALWAYS go with the trans...unless you want to swap stuff...
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Old 07-31-2008, 12:57 PM   #10
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^ Exedy clutch on an RS tranny with an STI swap will slip like crazy. They slip on the same trans with a stage II WRX swap, so there is no way it'll hold an STI swap, at least not for very long.

Unfortunately push style clutches are somewhat inefficient, and what will hold on a WRX or other pull style trans will not necessarily hold up with a push style transmission such as the RS. With an EJ257 unfortunately ACT is the only way to go, and you have to baby the trans, because an ACT bites HARD. One mis-shift and say goodbye. Trust me; its happened 4 times already with my car. By the way, ACT are stand-up guys; they've helped me out in the past with a shady vendor who I bought an ACT clutch from.

I would highly suggest buying a stronger transmission or thinking about a gearset, especially if you're looking to make more power. Buy at least a JDM WRX trans, if not a JDM Ver. 5/6 STI or 6 speed. Your gearset choices are STI RA, MFactory (don't know much about them yet, don't know anyone with a set) or PPG's (Best gearset, but $$$$).

Exedy makes all the OEM Subaru clutches by the way. As far as I know they always have.
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Old 07-31-2008, 03:32 PM   #11
snvin
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Quote:
Originally Posted by greenspeed View Post
I know that act isn't recommened by the guys down at ds1 i talk to. They have some beef with the company and exedy actually makes the newer wrx clutches and owns the patent on them...so if you own a wrx pull style exedy is the only way to go.

Bascially everyone in the swap world needs to know zephyr and im sure if you did a seach on the board you'd get over 500 hits on his name alone in bedded into threads.

Since you're running the stock rs trans with an sti engine. Expect great things. You launch hard, you're throwing out 1st gear no if's ands or buts. You're going to have to baby the thng if you want it o stand up. Otherwise get a hold of a few trans places on here Ds1 being one and getting yourself an mfactory gear set for a smooth $2600 installed, or baby your rs tranny and just enjoy rolling pulls and easier shifting...

however I'd really recommend getting a exedy lightweight and organic stage 1. The clutch and flywheel ALWAYS go with the trans...unless you want to swap stuff...
Oh yeah... I met Zephyr back in his AZP Installs days, and his work is well-known around here. Great reputation.


Regarding the transmission, I don't race, and I don't "launch," per se. At most, back when I had my WRX, I'd rev to 2-3K and slip (never drop) the clutch... and my only reason for doing THAT would be to get away from a soccer mom who was yammering away on her cell phone or something.

Is that kind of occasional driving beyond the realm of this trans/engine combo's capacity?

This car is going to be a daily driver, and I don't need to blast off like a rocket, but I do need something that will stand up to some occasional mildly spirited driving.

Quote:
Originally Posted by legacy2003 View Post
^ Exedy clutch on an RS tranny with an STI swap will slip like crazy. They slip on the same trans with a stage II WRX swap, so there is no way it'll hold an STI swap, at least not for very long.

Unfortunately push style clutches are somewhat inefficient, and what will hold on a WRX or other pull style trans will not necessarily hold up with a push style transmission such as the RS. With an EJ257 unfortunately ACT is the only way to go, and you have to baby the trans, because an ACT bites HARD. One mis-shift and say goodbye. Trust me; its happened 4 times already with my car. By the way, ACT are stand-up guys; they've helped me out in the past with a shady vendor who I bought an ACT clutch from.

I would highly suggest buying a stronger transmission or thinking about a gearset, especially if you're looking to make more power. Buy at least a JDM WRX trans, if not a JDM Ver. 5/6 STI or 6 speed. Your gearset choices are STI RA, MFactory (don't know much about them yet, don't know anyone with a set) or PPG's (Best gearset, but $$$$).

Exedy makes all the OEM Subaru clutches by the way. As far as I know they always have.
Um... you're freaking me out over here, dude!
Do you really mean that ONE mis-shift and my transmission is toast? What do you consider a mis-shift? Does that mean I can't even accidentally grind my gears *once* at say... 3K RPM?

Regarding "making more power," I won't be. The engine in question is bone stock, and I'd plan on keeping it that way. At most, I'd be looking at maybe a Prodrive axle back or something else post-cat. I want all of the emissions equipment intact. Is STi stock power too much for this transmission with my driving style (described above?)
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Old 08-02-2008, 12:47 PM   #12
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I would consider a mis shift as when you shift too hard into the next gear, particularly into second and third, as those are the gears I'd be concerned about. Grinding gears, while taking a toll on your syncros, won't necessarily pop a transmission. Shifting too hard, dropping the clutch as opposed to slipping it, etc. will.

Just be nice to it is all I'm saying. Don't take the RS trans for granted because it will blow up with an STI engine, even at stock power levels, if you abuse it.
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Old 08-04-2008, 03:34 PM   #13
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If $$$ is an issue I would pick up an extra 2.5RS 5speed for insurance. I've seen them on here for >$500, it would give you some peace of mind so you can stop worrying about the trans and drive it how you want.

A couple of months I might have a extra 5 spd for sale if all goes well
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Old 08-04-2008, 11:25 PM   #14
snvin
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Thanks guys. The seller is having second thoughts about letting his baby go, as it turns out.

I can't say I blame him.
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Old 08-05-2008, 11:55 AM   #15
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Snvin...I'm running into the same issue with my swap. Mostly caues I have a BD legacy and its a big car. Dylan at ds1 along with anyone i ask is saying I wont have long on my trans, I have the same as the rs. The issue is subaru decided they make really weak gear sets...the 02 03 wrx's stock wouldn't hold a tranny in them for the longest time when someone punushed them just a little bit...so basically...you either baby it, go mfactory, 6spd swap, or make your own out of popsicle sticks crazy glue, little etheopian childrens rice rations, and other things no suitable to be mentioned on this forum...
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