Engine question
Joined: Mar 2014
Posts: 4,553
Likes: 807
From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: Engine question
170hp 255 ft lb tq vs 205-230hp 300 ft lb tq. That is if they are both stock 305s. Who knows bout the engine on bottom it looks to have been out at one point.
Re: Engine question
The top one is , depending on year , either a computer controlled carb or a "TBI" , Throttle Body Injection . The bottom one is a "TPI" Tuned Port Injection . Mostly it's a personal preference type of thing , with most folks considering the TPI as being more modifyable for a bit more power over it's stock configuration . Some folks hate the TPI and ditch it for a straight (non computer controlled) carb , and some folks will go as far as to buy an aftermarket TPI controlled by such an aftermarket computer as the "Megasquirt" system .
Personal preference is what it comes down to , since either system CAN be modified to the owner's vision of what they want their car to be .
So , which one do YOU like better ? Thread Starter
Junior Member
Joined: Jul 2018
Posts: 13
Likes: 0
From: Delavan, wi
Car: 1990 camaro
Engine: 305
Re: Engine question
The top one is , depending on year , either a computer controlled carb or a "TBI" , Throttle Body Injection . The bottom one is a "TPI" Tuned Port Injection . Mostly it's a personal preference type of thing , with most folks considering the TPI as being more modifyable for a bit more power over it's stock configuration . Some folks hate the TPI and ditch it for a straight (non computer controlled) carb , and some folks will go as far as to buy an aftermarket TPI controlled by such an aftermarket computer as the "Megasquirt" system .
Personal preference is what it comes down to , since either system CAN be modified to the owner's vision of what they want their car to be .
So , which one do YOU like better ? Thread Starter
Junior Member
Joined: Jul 2018
Posts: 13
Likes: 0
From: Delavan, wi
Car: 1990 camaro
Engine: 305
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Joined: Jul 1999
Posts: 17,269
Likes: 170
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Engine question
Trouble with TBI systems and making power is that you can only flow so much fuel through 2 injectors and they have limits. With a TPI system, you have 8 injectors so each cylinder can get more fuel from an injector swap to make more power.
A 454SS pickup truck ran TBI which is larger than the SBC TBI system. Even with 454 CID, the injectors limited it to around a maximum 330HP
A 454SS pickup truck ran TBI which is larger than the SBC TBI system. Even with 454 CID, the injectors limited it to around a maximum 330HP
Joined: Mar 2014
Posts: 4,553
Likes: 807
From: South Ms
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
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Junior Member
Joined: Jul 2018
Posts: 13
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From: Delavan, wi
Car: 1990 camaro
Engine: 305
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