Building up a 305 TBI
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Junior Member
Joined: Jun 2007
Posts: 3
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Car: 1991 Pontiac Firebird
Engine: 305 TBI V8
Building up a 305 TBI
alright i got a 91 firebird with a 305 V8 and jus like everyone else i want more power outa it im not sure if this is where im supposed to post this lol but i wanna add some stuff to give me some more power im running stock right now
Joined: Sep 2005
Posts: 27,861
Likes: 2,427
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Building up a 305 TBI
There's a whole forum on this site devoted exclusively to the TBI motor.
On a thumbnail, that motor needs exhaust, every single piece; a cam; and better heads. Plus, they usually come with a terrible gear, so the car needs that in addition to, and sometimes INSTEAD OF, working on the motor.
Since TBI is a speed-density FI system, it is highly sensitive to certain types of mods, particularly big cams. It doesn't take much to make the stock programming badly mismatched to the motor's needs.
On a thumbnail, that motor needs exhaust, every single piece; a cam; and better heads. Plus, they usually come with a terrible gear, so the car needs that in addition to, and sometimes INSTEAD OF, working on the motor.
Since TBI is a speed-density FI system, it is highly sensitive to certain types of mods, particularly big cams. It doesn't take much to make the stock programming badly mismatched to the motor's needs.
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Joined: Jul 2004
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: Building up a 305 TBI
Check the FAQ board to get yourself started, then come back with more specific questions.
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