MPFI TPI TBI?
Thread Starter
Junior Member
Joined: Jun 2007
Posts: 83
Likes: 0
From: Orrville, Ohio
Car: 87 sport coupe, 85 Z28, 93 S10
Engine: 179ci MPFI,LG4 (soon L98), 4.3L TBI
Transmission: 700r4, none (soon T56), 700r4
Axle/Gears: stock, 3.23, stock
MPFI TPI TBI?
Now I know the difference between TPI and TBI but whats the basic difference between MPFI (Multiport Fuel Injection) and TPI? From what I can tell they seem the same. 1 injector per cylinder, air intake ducting looks similar. Is the difference between the engines they decided to put it on (MPFI - 2.8L, TPI - V8's) or is there a big difference functionally?
Supreme Member
iTrader: (2)
Joined: Jan 2002
Posts: 9,962
Likes: 5
From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: MPFI TPI TBI?
TPI is MPFI, but with tuned runners to provide peak torque in the engines midrange.
Junior Member
Joined: Aug 2007
Posts: 60
Likes: 0
Car: 1987 IROC-Z Camaro
Engine: 305 TPI
Transmission: 700R4
Thread Starter
Junior Member
Joined: Jun 2007
Posts: 83
Likes: 0
From: Orrville, Ohio
Car: 87 sport coupe, 85 Z28, 93 S10
Engine: 179ci MPFI,LG4 (soon L98), 4.3L TBI
Transmission: 700r4, none (soon T56), 700r4
Axle/Gears: stock, 3.23, stock
Re: MPFI TPI TBI?
Alright I guess that helps, I was kinda curious as to why they didn't have the same name.
----------
Yeah amazing what those runners can do (oh and that extra 177 ci too, pfft)
----------
Yeah amazing what those runners can do (oh and that extra 177 ci too, pfft)
Last edited by darrencarr; Aug 10, 2007 at 10:16 PM. Reason: Automerged Doublepost
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: MPFI TPI TBI?
MPFI is the general name for any EFI system with one (or more) injector per cylinder. TPI is the specific name for the MPFI engine in V8 thirdgen f-bodies and 85-91 Corvettes.
Thread
Thread Starter
Forum
Replies
Last Post
evilstuie
Tech / General Engine
22
Jan 9, 2020 08:29 PM
Sanjay
Engine/Drivetrain/Suspension Parts for Sale
1
Aug 12, 2015 03:41 PM
