TBI Vs. TPI
Thread Starter
Senior Member
Joined: May 2007
Posts: 365
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From: Central Michigan.
Car: 89' Camaro RS--
Engine: 305--
Transmission: Automatic
Axle/Gears: 2.73--
TBI Vs. TPI
Ive seen pics of both and currently i have TBI... but i was wonder what diffrences there are? Like power wise and thing like that... Whats the difficulty of changeign from tbi to tpi?
Member
Joined: Oct 2006
Posts: 364
Likes: 2
From: Charlotte NC
Car: 1991 Camaro RS
Engine: The Wicked six'ah
Transmission: 700r4
Axle/Gears: stock 3.08's
Re: TBI Vs. TPI
Its Not Worth Swapping. TPI Looks Better than TBI.. With the Right TBI Tune/Chip you can have a Decent Performer..
Joined: Jul 1999
Posts: 10,950
Likes: 27
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: TBI Vs. TPI

This topic comes up all the time and you will get 100 different opinions.
There are people on this board who have had good results with TBI, and there are people who have switched to TPI and never regret it.
Thread Starter
Senior Member
Joined: May 2007
Posts: 365
Likes: 0
From: Central Michigan.
Car: 89' Camaro RS--
Engine: 305--
Transmission: Automatic
Axle/Gears: 2.73--
Re: TBI Vs. TPI
I did a search... I dotn really want opinions im kinda like for like fact.. Like numbers or something to show a difference...
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
Re: TBI Vs. TPI
numbers as to what? hp/tq at what curves? Assuming you have a stock tpi or tpi, you can look at the factory specs. 305 TBI was 170hp?? 305TPI was 205hp??
Once its modded, it depends on what you put on it. Different size runners, heads, boring stuff out, how its tuned, etc etc is different for every single motor.
I can tell you now, even though TPI is not bolted onto my car yet, that TBI is easier to work on.
Once its modded, it depends on what you put on it. Different size runners, heads, boring stuff out, how its tuned, etc etc is different for every single motor.
I can tell you now, even though TPI is not bolted onto my car yet, that TBI is easier to work on.
Thread Starter
Senior Member
Joined: May 2007
Posts: 365
Likes: 0
From: Central Michigan.
Car: 89' Camaro RS--
Engine: 305--
Transmission: Automatic
Axle/Gears: 2.73--
Re: TBI Vs. TPI
what i was looking for was the stock numbers.. what you just said. Thats what i wanted.
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iTrader: (12)
Joined: Jun 2002
Posts: 6,819
Likes: 3
From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
Re: TBI Vs. TPI
ok. If you go to the main page, and look under specs, or year specific, it will give correct #'s and what rpm range.
Remember them numbers are different because of heads, intake, exhaust manifolds, camshaft, ecm, tuning. All thats really the same is the block and lower assembly.
Remember them numbers are different because of heads, intake, exhaust manifolds, camshaft, ecm, tuning. All thats really the same is the block and lower assembly.
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Joined: Mar 2000
Posts: 5,711
Likes: 133
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Joined: Jul 1999
Posts: 10,950
Likes: 27
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: TBI Vs. TPI
If you searched I dont see how you missed the 20+ times I've posted the info on the numbers we got when we swapped Dyno Don's old 92 RS from 305 TBI to 305 TPI. Basically it went from 158 RWHP and 220 RWTQ to 178 RWHP and 290 RWTQ, and gained about 1 mile per gallon.
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