I bought my 1991 Firebird from a private owner. It came stock with 3.1l MPFI V^, but i believe that she replaced it at some point along the line with TPI. Why I think this can be true, is b/c i know that 3.1L V6 with MPFI puts out 140HP@4400rpm. I doubt my car is only 140HP, because it seems alot faster than that. Also if this is true, how much HP would a 3.1l TPI V6 have?
thanks for help.

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Destroy Hate!

So you have a TPI on a V6 3.1L.............? OK riiiiiiiight

[This message has been edited by Monkie (edited October 08, 2001).]

I'll have to agree with Monkie on this. You may want to double check that. It would be a b**** to cut the back 2 runners off with a hacksaw.... not to mention getting it to fit and whatnot...

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2.8 mpfi
My only mod: Flowmaster 40 series
http://www.geocities.com/pita_j2000/...?1002261961590
PICS ARE UP!!

[This message has been edited by Black 86 'bird (edited October 08, 2001).]

Hey man, welcome to the board! Don't take this the wrong way but you DON'T have TPI. Now mpfi is what came stock on your car and I am willing to bet you still have that. Anyways mpfi is almost identical to the kind of induction the tpi gives. Only tpi is for a v8 car. I don't think there would be any performance gains from somehow fitting a TPI system on there. But I know what you're going thru with the car feeling faster than it is. That's how I was jipped into my car. And yes, stock your car only has 140 horses. If you want to up the amount, talk to the guys on here. They will help you up the horses in no time. Good luck with your car!

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1992 Polo Green RS 3.1L K&N conical and working on the ram air....

"Yeah, it's a V6 SO WHAT!?"

Best advice. Get a muffler to happy your ears and then go straight to the engine. Don't bother with bolt ons. Get camshaft, roller rockers, port and polish heads, mill the heads, bore the block out... Ok I will slow down now. Oh and sorry for the poor welcome I didn't notice you were new. WELCOME ABOARD!!!!!

maybe its a 3.4

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-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz



Got Beach?

Ok. But I think i remember reading in the manual that the car is 192 HP stock.
So, what else might have come with some 1991 Firebirds that generates more than 140 HP Stock? And I do have many plans for the car -such as K&N Breather/Filter, Dynomax Exhaust, and some sort of free flow muffler. Also maybe a free flowing catalytic converter. Ive beaten mustangs at lights, so this is why I have a hard time accepting 140 HP.

http://albums.photopoint.com/j/View?...899&Sequence=0 Does your engine look like that?

(copy and paste )

[This message has been edited by Monkie (edited October 09, 2001).]

sorry guy but there is no such hting as a 3.1 TPI, it may look like it because it's MPFI, MPFI and TPI are the same exact thing EXCEPT the 3.1 has 2 cylenders and injectors less than the V8 TPI, other than that they look pretty much the same. i retty sure you mistaken, does it look like you have a spyder for your plenum with 3 big pipes coming out each side? thats TPI, if you have a rectangular flat surface then it's a 3.1 and if you have an X shape with a chrome symbol on the top it's 2.8

Take a picture of your engine, that should help us in figuring out what it is. TPI, ummm... no.

ill take a look sometime today and let you all know...

hey unity, welcome to the board
well...i do doubt that there's a TPI sitting under your hood, and i'm not sure what motor had 192hp, maybe 192 ci, or 191 can't be sure off the top of my head.which would be the 3.1L v6, now a 2.8L/3.1L can feel like a fast motor, in all truths, if you have one that's been wellmaintained you'll be beating cars up and down the street. But Tuned Port Injection doesn't look quite like Multi Port Injection, just find pics of both, and compare.The person who had the car before you, might have cammed it, maybe they even bored it out some, and it could have been replaced with a 3.4L, like in a 93-95? camaro/firebirds, but those motors were only rated at 170hp, the new 3.8L is rated at 200hp, but it'd be as much work as swaping in a 350, and not worth the effort. anyway, welcoem aboard, and lets see some pics of that motor, so we can help you out.

Monkie, I like the where you put your aftermarket stuff stickers, I can't stand stickers on the back of cars, thats the best place to put them I have seen.


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Jeff
92 Camaro V6, mods: K&N, modified air box, JET chip 2,Dynomax Cat & Cat Back System
www.camarors.4t.com

Man.. I've heard some wacky things in my time.. but damn. No, it's not TPI unless it's an 8 under there and you don't know how to count. TPI is merely a form of MPFI. There would be no power gain (in fact, there would be power loss because even the stock TPI runners are too freaking big for the 60 degree V6's displacement per cyl) from SOMEHOW strapping a TPI setup on one of our engines.. you're just finding out what it means to drive a car with decent torque... or it's an 8.

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'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
Misc Mods: Cut air box, '83 Firebird spoiler.
Performance Parts: MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers.
Audio Mods: Pioneer DEH-P3000, two 12" Optimus Pro Audio subs in hand-made enclosure each powered by a 260 watt Optimus amp. Working on shaving the box for weight.
My Homepage, with pics.

No Tpi and MPFI are not the same. No your V6 does not have 190 hp listed for it anywhere, and no it does not beat mustang GTs, unless the GT is in ver very sad shape.

Tpi is a Tuned runner Voulume set up that is based on the pohisics principle that the most powerful wave is the second harmonic. So the runners feed the cylinder on the 2nd harmonic to create a "ram" effect to creat a sheet load of torque on a 305. Very good system in principle. Went back to using that idea on the LS1's just made to feed at a higher RPM
The MPFI is more like a LT1 intake, untuned runners made to operate over a large powerband with short intanke runner lengths.
Completely different designs.
Though yes they do have their simalarities such as 1 injector 1 port per cylinder.


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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

Welcome to the board, Unity! It's possible that the previous owner might have replaced the -motor- with a new (or rebuilt) one, and maybe the fresh motor's what's giving you more power. But a car can be fast without having high HP... if it really bugs you, you can go run the car on a chassis dyno; that'll tell you how much rear wheel HP your '91 has.


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-Tom P (Hot rodded 1986 Firebird 2.8l)

You guys have all been very helpful.
Thanks a bunch for the knowledge & screw those of you that tried to make fun of me =)
I never bothered to count my cylinders, and yes i do know how to count.
But since i bothered everyone, ill do you all the favor of letting everyone know what I find out once I go run a dyno. later all.

so im open for any and all tips on cheap effective modifications i can do. of dont mention k&n and all the known crap. anyone got any aces up thier sleeve?

You have to start somwhere, because without the K&N and a good exhaust system you are not getting anywhere.
First thing is to do a complete tune up with Hi performance Ignition equipm,ent and do a compression and leak down check. Then replace all your filters, fluids and other such things and replace them with the best stuff you can find, or you shoice of brand.
You have to crawl before you can walk and you must walk before you can run



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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!

Unity...do me a favor. Post your Vin number....you can leave the last 4 or so numbers XXed out if you're worreid about it.just post it for me.

high performance ignition equipment... meaning, fuel injection cleaning, replacement of spark plugs etc? can you be more specific, id like to go about this in the right way to avoid hurting my car. information much appreciated