Difference between TPI, TBI & MPI
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Joined: Oct 2006
Posts: 102
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From: New Zealand
Car: 89 Iroc-Z Ragtop, 2012 Toyota Hilux
Engine: 305ci V8 TPI
Transmission: Both Auto's(Wife can't drive stick)
Difference between TPI, TBI & MPI
I have searched but can't find the answer to my dumb question. What is the difference between TPI, TBI & MPI engines and what are the pros & cons? 
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Tuned Port Injection - tuned runners, injectors at the intake port of the head.
Throttle Body Injection - a 2-barrel injection system with the injectors in the throttle body, an electronic injector replacement system for a carburetor.
Multi Port Injection - the 6-cylinder system.
Throttle Body Injection - a 2-barrel injection system with the injectors in the throttle body, an electronic injector replacement system for a carburetor.
Multi Port Injection - the 6-cylinder system.
Thread Starter
Member
Joined: Oct 2006
Posts: 102
Likes: 0
From: New Zealand
Car: 89 Iroc-Z Ragtop, 2012 Toyota Hilux
Engine: 305ci V8 TPI
Transmission: Both Auto's(Wife can't drive stick)
Re: Difference between TPI, TBI & MPI
Thanks just trying to enhance my knowledge so TPI would be better?
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Depends who you ask. . .
The factory used TPI for their higher output engines (not "HO", higher horsepower). That doesn't mean you can't get TBI to make as much power, but the aftermarket doesn't support it as well, and the factory saddled TBI with some restrictive parts (heads, exhaust).
Of course, LT1 > TPI, and LS1 > LT1, so where do you want to draw the line?
The factory used TPI for their higher output engines (not "HO", higher horsepower). That doesn't mean you can't get TBI to make as much power, but the aftermarket doesn't support it as well, and the factory saddled TBI with some restrictive parts (heads, exhaust).
Of course, LT1 > TPI, and LS1 > LT1, so where do you want to draw the line?
Joined: Jul 1999
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
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From: Chasing Electrons
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Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Alright, a mod war!!!!
Tonka, what are you trying to accomplish? What do you have currently?
Tonka, what are you trying to accomplish? What do you have currently?
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Thread Starter
Member
Joined: Oct 2006
Posts: 102
Likes: 0
From: New Zealand
Car: 89 Iroc-Z Ragtop, 2012 Toyota Hilux
Engine: 305ci V8 TPI
Transmission: Both Auto's(Wife can't drive stick)
Re: Difference between TPI, TBI & MPI
Opp's sorry, Just wanting to learn. I have a 89 Iroc-Z 305 TPI Vert, Just sold a 86 TTop TPI
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