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Old 07-20-2002, 08:45 PM   #1
Scooby Newbie
Member#: 5808
Join Date: Apr 2001
Location: Cabano,Québec,Canada
1999 RS-T/Legacy

Question throtle body & head porting???

Did someone have a over size throtle body and head porting on there RS-T???

Did give it give allot of power to the car???

Do you think just a throttle body over size will give a little kick to mi engine???

In what range on HP do you think it goes???
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Old 07-20-2002, 10:26 PM   #2
Scooby Newbie
Member#: 15702
Join Date: Feb 2002
Chapter/Region: TXIC
Location: Houston,TX
2001 2.5 RS-T LINK'D
911verion2.0TT (soon)


Head Porting- will increase performance slightly without any other modifications...

Throttle Body- is fine as it is....It is already pretty large for the displacement of our engines anyway....
I suggest you look into it a little more before making any desicions and talk to a tuner who knows about SUBARUS...
I am working on a buildup but Im using a spare engine and doing all internals and Port and polishing the heads as well as a mild cam keeping the Stock Throttle body by the way....
Look into getting a standalone, or some injectors for a easy gain in power...
BUT thats just my 2 cents
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Old 07-22-2002, 02:47 PM   #3
Scooby Newbie
Member#: 7534
Join Date: Jun 2001
Location: manchester, NH
99 impreza rs-t
rally blue pearl


I prrted and polished my own heads, Had my ixtake extrude honed and throttle body bored. I got an a n/A motor about 1.2 secs better in the quater mile than without. With the turbo who knows but it pulles hard!
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Old 07-22-2002, 10:59 PM   #4
Impreza Rider
Scooby Specialist
Member#: 756
Join Date: Jan 2000
Chapter/Region: MAIC
Location: Ashburn, Va
2003 Legacy L wagon
2009 Kawasaki C14


How much were you able to bore out the TB? There's only like 2mm of extra material around it.
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Old 07-23-2002, 12:45 AM   #5

Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
04 FXT


RiftsWRX and I spent some time on my TB and managed to knife-edge it from 52mm to 57mm at the edge. Made a massive difference NA, not sure if it'll help turbo or not, though.
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Old 07-23-2002, 08:24 AM   #6
Scooby Newbie
Member#: 7534
Join Date: Jun 2001
Location: manchester, NH
99 impreza rs-t
rally blue pearl


I sent it out to cobb and had them do it, (when they were doing it). It is alot bigger now i'm not sure how big it is i didn't measure it, but i did have to bore the inlet of my intake manifold to get it to flow and not hit a step.
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