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What benefits will I by switching to TPI??

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Old 07-03-2001, 03:33 PM   #1
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Join Date: Oct 1999
Location: Carrollton, TX, USA
Posts: 779
Car: 1992 Chevy Camaro RS
Engine: 305 TBI
Transmission: T-56

What benefits will I by switching to TPI??

Well after many many hours of thinking....and changing my mind many times...I finally decided to switch from TBI to TPI....i was looking around on ebay...and they have complete tpi packages with ecm and everything for around $500. Anyways...Right now the only mods I have are the exhaust.....but I will be getting a new engine later on....looking at about 350-425 HP engine....then throwing in NOS at the end. I know i'll need to upgrade the TPI system (base, runners, plenum) when I get the new engine...but for now...I think i'll go ahead and switch over to TPI....and get the wiring out of the way for the engine swap. I have a stock LO3 Automatic....I am aware of the "peanut cam" and the crappy heads....but by switching over to TPI...what improvements will i get in terms of power and fuel economy? Also, I read on the tech article that I need to change the fuel pump....should I change to one that will handle my new engine...or will that be too much for the 305? Also, where is the fuel pump sending unit? That was also in the tech article...but didnt say where it goes. Also....I do need to pass inspection...so how do i go about hooking up the EGR? Can I just use the one on my current car and switch it over? Thanks for all the info.

1992 Teal Camaro RS
305 TBI V8
Open air element
3" Flowmaster Exhaust System w/Quad Tips
Aiwa CD/Mp3 player
10 Disc CD Changer
Rockford Fosgate Speakers
SLP Headers Coming
Dynomax High Flow Cat Coming
More to come.
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Old 07-03-2001, 04:23 PM   #2
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Join Date: Mar 2000
Location: Red Bud, Illinois
Posts: 669
Car: 1989 IROC-Z
Engine: 383
Transmission: Pro-Built 700R4 2400 ACT Stall
Axle/Gears: 2.77 Borg Warner 9-Bolt

Honestly i would think it to be cheaper and better to upgrade your TBI, different manifold, dual TB's, etc...i don't see TPI justifying 500 dollers.

89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-Gutted Air Boxes
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Old 07-03-2001, 04:34 PM   #3
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Join Date: Mar 2001
Location: Doghouse ииииииииииииииииииииииииииииииииииииии Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Posts: 13,337
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45

If you really wanna, I have a post on my website giving a journal of the things I did to convert my car from a 4bbl to TPI. visit http://www.3rdgenformula.com. Granted going from TBI to TPI is different than a 4BBL to TPI. I personally did it for asthetic value, I like the way it looks, great for car shows. (its amazing the people who didn't know these cars actually came with TPI.

As for Fuel econ, I went from 16-18 MPG highway to 23.5 highway. Keep in mind I had a 4bbl.

If you want SERIOUS HP, I know you can squeeze it out of a TPI setup, but look for paying more than just a stock setup.

Dont be fooled, you WILL need to change your fuel tank fuel pump, they are waaayy different, while your at it you should run better fuel lines to boot. There is more than you see under the hood.

As for paying $500 for only a wire harness, computer & Intake, start looking into the bone yards, I bought a whole CAR for $800 and then I HAD everything I needed. I know where you can get a whole running 86 TPI camaro for $600 bux.

Good luck


87 Formula Yellow/Black
Engine & Transmission
.040 over 5.0 converted to TPI, 9.5:1 Compression, SLP Cam Dur 206/212, Lift 480/487, Cent Line 112, SLP headers, SLP cat-back exhaust, K&N Airfilter, Modified Stock cold air intake, Ported & polished Stock TPI intake, Holley Adjustable Fuel Press regulator, AC Rapidfire Spark Plugs.
Gil Younger (no yo-yo) Shift Kit, Aluminum Driveshaft, 3.73 Posi gear
Suspension & Brakes:
Baer 12" brakes 4 wheels, KYB AGX Adjustable Shocks & struts, Hotchkis strut tower brace, South side machine frame connectors, Custom reinforced control arms and pan hard bar.
Custom Leather interior, CUSTOM Yellow Gauge Faces, Kenwood Receiver, Pioneer Speakers, Kicker Substations, Kenwood 10 Disk Changer, Pioneer Amp.

87 Formula TPI (5 Speed) Yellow/Gray STOCK

1967 Buick Riviera 430hp Turns high 14's (Not bad for 4300 lbs)

83 Camaro (Parts)
83 T/A (parts)


[This message has been edited by okfoz (edited July 03, 2001).]

[This message has been edited by okfoz (edited July 03, 2001).]
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