what is tpi? - Third Generation F-Body Message Boards

cfirebird86 · 08-20-2002, 09:49 PM

I am new to the car world and trying to figure out terms. How do i know if my car has TPI? or TBI? and what does it mean. I see what the TPI and TBI stands for but unsure of the defination in plain english.....

86FyrBrd · 08-20-2002, 09:52 PM

If this is a joke or not, here it goes.

TPI = Tune Port Injection

TBI = Throttle Body Injection

HSR = Holley Stealth Ram Intake

MAF = Mas Air Flow Sensor

LT1 = 3 letter designation for an engine/intake (4th Generation & Vettes)

LS1 = 3 letter designation for another engine/intake (4th Generation & Vettes)

MAP = Manifold Absolute Pressure

IAT = Idle Air Control

CAI = Cold Air Induction

T5 = 3rd Generation Manual Transmission

T56 = 4th Generation Manual Transmission

3rd Gen = our cars... 1982-1992

4th Gen =1993-2002

Theres to many to come up with.

Grim Reaper · 08-20-2002, 09:53 PM

Terrible Performing Intake

89blackGTA · 08-20-2002, 09:53 PM

What???? is this a wierd joke? You are a member with 111 posts and you dont know what tpi is.
Interesting. I dont know if I should actually answer this or not.

Brian

bigbrianiroc-z · 08-20-2002, 09:56 PM

tpi stands for tuned port injection and its one fo the first performance fuel injection systems gm made. its really good for low end torque b/c of its long runners but they start ro restict air flow at about 4000 rpm. i think its great and it looks really cool

86FyrBrd · 08-20-2002, 10:01 PM

easy way, Throttle Body injection (TBI) looks like a carb. and has an injector in the throttle body

TPI doesnt looks like a carb, has a big cast plenum then nice tubes (runners) going down into an intake manifold, also has fuel rails and 8 fuel injectors.

cfirebird86 · 08-20-2002, 10:01 PM

I saw what it stands for I just don't understand what tuned port injection is. I know something is inject.

here is what my engine looks like

Grim Reaper · 08-20-2002, 10:16 PM

Quote:

Originally posted by cfirebird86
I saw what it stands for I just don't understand what tuned port injection is. I know something is inject.

Well, if you kept that hood opened long enough on your picture, I'd tell you. Why'd you edit your first response, I thought it was funny.

j/k

cfirebird86 · 08-20-2002, 10:20 PM

I just made that avatar today.
But here is a pic of my engine

86FyrBrd · 08-20-2002, 10:29 PM

Thats a 2.8l 6 cyl. it is MPFI, (Multi Port Fuel Injection) kinda the same idea as TPI.

BORLAZ06 · 08-20-2002, 10:49 PM

Quote:

Originally posted by 86FyrBrd
If this is a joke or not, here it goes.

4th Gen =1993-2002

4th Gen =1993-1997

86FyrBrd · 08-20-2002, 10:50 PM

and what, 97-2002 was 5th generation? No, still 4th

LT1 4th gen is 93-97
LS1 4th gen is 98-02

Snowdog 91 Formula · 08-20-2002, 11:18 PM

Hehehe. HSR. Oooh I have one of those!

LOL Okay.
OOPS! Read it wrong... I think I would have the HSP....
Holley Stealth Projection.

Oh hell what do I have? Hahahaha....
Ummmm
SIM?
Okay.

S10Wildside · 08-21-2002, 09:03 AM

This is TPI (tuned port injection)

Works similar to any other fuel injection system. In this case:
air goes through the throttle body, into the plenum, down the runners, meets with the fuel and spark. The 8 fuel injectors are in each port. It's better than TBI because TBI only has (usually) two injectors and just dumps air and fuel down the throttbody. It's inefficient.

Poppa Chubby · 08-21-2002, 09:25 AM

That's a pretty TPI system too. Very clean.

tpi_roc · 08-21-2002, 12:56 PM

Take it easy on cfirebird

If its the same person, she's a female thats new to the car scene and Im sure her questions are sincere.

86FyrBrd · 08-21-2002, 01:37 PM

Hey I try to be nice to everyone, I answered the question with as much information as I could

SHO350 · 08-21-2002, 05:16 PM

Also, tuned port injection has superior fuel atomization and more efficient combustion because the fuel is injected into a high speed air flow just a bit upstream from the intake valve. This leaves most of the intake manifold dry and allows for almost perfect cylinder-to-cylinder fuel distribution.
It may not always produce more power than a carb or tbi based engine, but it is always more efficient.

tpi_roc · 08-21-2002, 05:23 PM

Quote:

Originally posted by SHO350
Also, tuned port injection has superior fuel atomization and more efficient combustion because the fuel is injected into a high speed air flow just a bit upstream from the intake valve. This leaves most of the intake manifold dry and allows for almost perfect cylinder-to-cylinder fuel distribution.
It may not always produce more power than a carb or tbi based engine, but it is always more efficient.

Almost perfect fuel distrobution, but certainly not air distrobution, so you end up with uneven cylinders anyways.

Hate to say it but ford had the right idea on the A/F distrobution.

Odyssey · 08-21-2002, 05:35 PM

I think "cfirebird86" has a FV6 ! Which I think stands for "Flithy V6" lol

5SIZ · 08-21-2002, 07:55 PM

Quote:

Originally posted by Odyssey
I think "cfirebird86" has a FV6 ! Which I think stands for "Flithy V6" lol

LMAO...um yea

you have a 2.8 liter multi port fuel injected system, A.K.A. MPFI.

MPFI & TPI's concepts are almost the same, the only differences is that one is that TPI is a V8 "duh," TPI is a batch fire system where MPFI shoots cylender at a time, and TPI has tuned runners.

Batch fire means whent he car is running, all of the fuel injectors in the left side shoot at once, then all of the right ones, and the cycle goes on. you could plug the injector plugs on one side completly reverse and the car would run fine because of the batch fire setup.

MPFI on the other hand would wig out lol.

hope I was of some help