STI alternator, what years? - Subaru Impreza GC8 & RS Forum & Community: RS25.com

89zxTO2.5rs · 06-22-2009, 04:41 AM

Like the title says. I spent hours searching and I even dug through the "Impreza compatibility" thread, but every where I read it doesnt specify what year STI, or a question of what year isnt really answered. Any specifics that would fit a 2001 RS stock engine? Search function was used. Thanks all.

not12listen · 06-25-2009, 04:02 PM

i swapped out my 99RS alternator for an 04/05 USDM STi Alternator. no problems at all.

there are no fitment issues, no wiring issues and no plug issues at all.

the headlights/foglights and dash lights are just a BIT bright, but nothing else really.

TheDarkCanuck · 06-26-2009, 01:34 PM

How many amps is the STi alternator compared to the regular alternator?

**Silicon_70** · 06-26-2009, 02:29 PM

Subscribed

**RoadRunner** · 06-26-2009, 02:31 PM

Quote:

Originally Posted by TheDarkCanuck

How many amps is the STi alternator compared to the regular alternator?

90 vs. 70, IIRC.

not12listen · 06-26-2009, 04:57 PM

93-01 Impreza are 75amps.
02-04 STi are 90amps.
05-07 STi are 100amps.

clsmooth · 06-26-2009, 05:43 PM

Swapped in an 04 STi alt into my 00RS. Bolts in. Plug-n-play. Direct replacement. I think mine was a JDM alt too? Dunno if there's a difference between that and USDM though...

**2slo4u** · 06-26-2009, 06:45 PM

The 99 or 2000 legacy is also 90amps and is plug and play. I have one that I swapped my defective one for at Advance. I put the 97 jdm wrx alternator on to drive to the parts store and it works fine so the "new/rebuilt" one is for sale. I'm going to buy a 200 amp alternator from the Iraggi guy on fleabay, my amplifiers crush 90amp alternators like grapes.

89zxTO2.5rs · 06-26-2009, 07:31 PM

These are great rep's. Thanks for the alternative, 2slo4u. What about the newer STI's 06+ for fitment? Greatly appreciated.

TheDarkCanuck · 06-27-2009, 01:34 PM

Right on, glad my question got answered with nice responses.

Definitely going to add this one to my upgrade list.

06-22-2009, 04:41 AM	#1 (permalink)
89zxTO2.5rs 2.5L Car: 2001 obp RS Fav Mod: upgrading from a Z My: Subaru Parts Join Date: May 2009 Location: MA Trader Rating: (2) Posts: 235	STI alternator, what years? Like the title says. I spent hours searching and I even dug through the "Impreza compatibility" thread, but every where I read it doesnt specify what year STI, or a question of what year isnt really answered. Any specifics that would fit a 2001 RS stock engine? Search function was used. Thanks all.

06-26-2009, 02:29 PM	#4 (permalink)
Silicon_70 I'll miss her.. Car: 00' 2.5RS Coupe, 70' TLC Fav Mod: Grounding Mod & 4-pots My: Subaru Parts Join Date: Aug 2007 Location: Central Coast,CA Trader Rating: (6) Posts: 523	Subscribed __________________ Stop PMing folks, the lady in my avatar is not me.

06-26-2009, 06:45 PM	#8 (permalink)
2slo4u Premium Member Car: 95L w/EJ20K, R6 Fav Mod: +170 chp My: Subaru Parts Join Date: Apr 2006 Location: Louisiana Trader Rating: (17) Posts: 4,593	The 99 or 2000 legacy is also 90amps and is plug and play. I have one that I swapped my defective one for at Advance. I put the 97 jdm wrx alternator on to drive to the parts store and it works fine so the "new/rebuilt" one is for sale. I'm going to buy a 200 amp alternator from the Iraggi guy on fleabay, my amplifiers crush 90amp alternators like grapes. __________________ I've got a FEVER, and the only thing that can cure it is more WHP!!!

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06-25-2009, 04:02 PM	#2 (permalink)
not12listen 2.2L Car: 1999 2.5RS, 1986 Mr2 Fav Mod: rear brake upgrade My: Subaru Parts Join Date: Jun 2007 Location: sf bay area, ca Trader Rating: (1) Posts: 146	i swapped out my 99RS alternator for an 04/05 USDM STi Alternator. no problems at all. there are no fitment issues, no wiring issues and no plug issues at all. the headlights/foglights and dash lights are just a BIT bright, but nothing else really.

06-26-2009, 01:34 PM	#3 (permalink)
TheDarkCanuck 2.2L Car: No more car...yet. My: Subaru Parts Join Date: Jan 2009 Location: Durham Region, ON, Canada Trader Rating: (0) Posts: 164	How many amps is the STi alternator compared to the regular alternator?

06-26-2009, 04:57 PM	#6 (permalink)
not12listen 2.2L Car: 1999 2.5RS, 1986 Mr2 Fav Mod: rear brake upgrade My: Subaru Parts Join Date: Jun 2007 Location: sf bay area, ca Trader Rating: (1) Posts: 146	93-01 Impreza are 75amps. 02-04 STi are 90amps. 05-07 STi are 100amps.

06-26-2009, 05:43 PM	#7 (permalink)
clsmooth 2.7L Car: 00 BRP RS Coupe Fav Mod: Stainless Exhaust My: Subaru Parts My: Subaru Blog Join Date: May 2005 Location: Vancouver, BC Trader Rating: (0) Posts: 341	Swapped in an 04 STi alt into my 00RS. Bolts in. Plug-n-play. Direct replacement. I think mine was a JDM alt too? Dunno if there's a difference between that and USDM though...

06-26-2009, 07:31 PM	#9 (permalink)
89zxTO2.5rs 2.5L Car: 2001 obp RS Fav Mod: upgrading from a Z My: Subaru Parts Join Date: May 2009 Location: MA Trader Rating: (2) Posts: 235	These are great rep's. Thanks for the alternative, 2slo4u. What about the newer STI's 06+ for fitment? Greatly appreciated.

06-27-2009, 01:34 PM	#10 (permalink)
TheDarkCanuck 2.2L Car: No more car...yet. My: Subaru Parts Join Date: Jan 2009 Location: Durham Region, ON, Canada Trader Rating: (0) Posts: 164	Right on, glad my question got answered with nice responses. Definitely going to add this one to my upgrade list.

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