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Old 10-19-2009, 01:42 PM   #1
Drives: 04 Pathfinder
Join Date: Jul 2008
Location: New York
Posts: 49
What is the Main difference between TPI and TBI?

tuned port injection and throttle body injection
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Old 10-19-2009, 05:19 PM   #2
Drives: 2010 Black on Black SS L99
Join Date: Sep 2009
Location: Cordova TN
Posts: 48
TBI is basically a high tech carb. The injectors are mounted in the throttle body.

TPI is usually multiport fuel injection. There is one injector per cylinder, therefore more effective. The throttle body controls the air flow. Injectors deliver the fuel flow.
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Old 10-19-2009, 07:29 PM   #3
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Join Date: Jun 2009
Posts: 488
Yep what ttss said.
TBI is a wet flow manifold (gas & air)

TPI is a dryflow manifold. (Air only)

I've never considered TBI true fuel injection. As ttss said it's more of an electronic carb. You still have all the issues of cylinder balance.
They do serve as a good carb upgrade for off-road trucks, though.
"everyone wants to go to heaven. but nobody wants to die" "you gotta pay to play"

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