I am looking into buying a 91 camaro z28 manual 305 TBI and i was wondering if its a really tough process of switching the TBI set up to TPI? or is just the process of switching intakes or what? i dont really have any idea at this point, i'd apreciate if you could help me out, thanks guys.

 

Are you sure it's a Z28? I'm pretty sure all 1991 z28s had TPI. Anyways, to reply to the topic, there are many, many other mods you should do first before even thinking about the swap. You will actually like the cost and ease of use of the TBI and mods. However, if you are set on doing the swap, then I would suggest posting this over at the TPI board. Wait for the search engine to come back online and do a search as well, and you will find a ton of info on the swap and if it's even worth the money.

 

switching from tbi to tpi isnt hard...u need to replace the intake and tpi setup and ull need to replace the fuel pump, im pretty sure thats it, search(if u can) and ull find out a lot, yeah check in the tpi board for more info

 

"Q: What is needed to convert my engine to TPI fuel injection?

A: You'll need to find the following:

TPI intake
TPI plenum and runners
Throttle body
MAF sensor, intake hose, filter case
Injectors (19 lb/hr for 305, 22 lb/hr for a 350)
Oxygen sensor (if your's doesn't already have one)
Knock sensor (if your's doesn't already have one)
Intake air temp sensor (goes in plenum underside)
EGR solenoid
Coolant temperature sensor
Cold start injector sensor
Electronic Control Module (ECM or computer)
Re-route EGR and charcoal cannister ported vacuum as per TPI setup
A/C bracket to TPI intake (upside-down U-shaped bracket)
The best (cheapest) way, is to find the parts through junkyards"



as quoted from the FAQ section on the site, hope this helps

 

Actually since it's a 91 it won't have a MAF sensor, in 1991 and 92 the sesnsors were MAPs....hence speed density. I never really understood why they went to SD because changes in a MAF sensor went alot smoother than MAP sensor changes did. A guy once put a hot....and i mean HOT cam into a 92 RS and the bugger wouldnt run for crap. The MAP sensor had to be rebuilt and customized, and entire ECM had to be purchased cuz for some reason the system panicked and blew the whole computer up. Well, enough of that story.