Ok, I've got the good ole TBI in my 92 RS v8. I don't have much money to spend on modding it right now, and have some other small fixes yet to do (Got some leaks, somebody says my clutch feels strange) But is the TPI a major upgrade from TBI? or will it just end up costing a lot and being a pain in the butt more than it will add to performance? Also, any ideas on cost?

 

Yes its a major upgrade. Check the tech article on this site for an idea.

My dad converted to TPI on his 92 RS and gained 17 HP and 70 TQ at the wheels...

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

yes but home much money and time did he spend, If i have a TB car, I would keep it that way, but I have a TPI so I am gonna keep it that way.

 

It's a pain in the *** , time consuming, and expensive, but I'm sooooooooo glad I did it!!!!!

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'88 IROC TPI 355, '69 truck 4-bolt, fully balanced, 9.75:1 compression, fully ported '70 truck heads(for now), Harland Sharp 1.6 Roller Rockers, Comp Cams CS 252AH-12, ported '86 TPI converted to speed density, Crane AFPR, Flowmaster 3in. exhaust, Edelbrock TES headers, all emissions equipment is still intact, plan on burning my own chips, many more mods and parts on the way as time and money permits =(
Best E.T. with TBI 305: 16.11 @ 82mph
Haven't been to track with new motor
If you have any questions on converting from TBI to TPI email me at jdkchevy70@yahoo.com
In memory of Dale Earnhardt, I'll miss cheering for that black #3 on raceday!!!

 

I've been considering the same swap on my 91 chevy truck. I've got an almost complete tpi setup except for a set of fuel rails that I could use.

I'd like to see an article about reusing the tbi wiring and adapting it to run the tpi.



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87 IROC-Z, 5.7, auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, SLP .218/.224 .495/.502 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback. Coming Soon(?)- Fasttrack/Accell DFI

1989 Pontiac 20th Anniversary Turbo Trans Am - 161,000 miles, !cat, 9" K&N

 

I'm the one that just did the swap on the '92 RS.

It took awhile, but I did the research ahead of time so when I was ready I had everything I needed.

I collected everything for about $350.

The actual time to switch the hard parts took 2 1/2 hours, the wiring a little more.
I used the TBI harness and modified it (you have to have both diagrams TBI & TPI and study them very carefully making notes).
Under the dash is a little more complicated,
however it just takes time and patience the TBI uses a speed buffer to transfer the VSS output to the computer and the speedo & cruise control. The TPI VSS feeds directly into the puter and then out to the speedo & cruise. So, you have to move some wires around but if you study the diagrams it's not difficult. It does help if you have had pryor experience. If you don't like a challenge don't try it.
http://24.1.139.249/images/122000/DCP_0108.JPG Here's what she looks like when done.
Some of the TBI wires had to be extended to reach the components(I got these from a pick-a-part yard). E-mail me if you're serious I'll help all I can.
Don>>>

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Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies

[This message has been edited by Dyno Don (edited April 23, 2001).]

 

I'm in the middle of procrastinating before I convert my '80 to TPI. Still sweating bullets about finding a wiring harness, and a fuel system... All in all, it will probably cost about $1000 MORE to get it in and working, and all I'll end up doing is taking away from the currently flawless reliability of my carb in exchange for 2 more mpg and some torque.
p.s. want a TPI cheap?

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better