So I have done the 305 T.P.I. to 350 swap.
So lets start with the major issue I'm facing.
Ok so before I threw the injectors and computer in I was running lean
and sucking in over 2000 G/S and would never some down, now I am running lean, so I let it run like that until I could come up with some money for the rest of the upgrade. Well about a week ago I started over heating really bad, replaced the Thermostat, did nothing and I was out of ideas. I'm no pro I've got little experience, I work at a shop with people that know what they are doing, or I think. So my boss said we can't rule anything out until we get the injectors and computer in, so I did. She fired right up but was running really rich now with the same problem with the air intake being around 2000 G/S.
I've replaced the Mass Air Flow Sensor and Relay, I threw the smoke machine on everything and still no leaks is found, I'm running out of money and patients the car should be somewhere around 10ish I'm not sure what the number is for G/S but I know its not 2000 G/S if anyone has any thoughts or has had this problem before anything helps


1986
Firebird Trans Am
350 TPI
Camaro 5.7 350 Computer
Engine Code F

 

The stock injectors for your 305 were 19# factory, 350 injectors are 22# factory. It seems that most of us here are running 24# injectors with our 350's and not having any trouble with them.

 

They didn't make a 350 TPI in 86. What chip are you running?

SHORT OF A CUSTOM TUNE, my experience with earlier MAF-equppped TPI systems is that you are better off running the STOCK injectors (19#) with the STOCK chip (that expects 19# injectors to be installed), even on a bigger engine. MAF systems can compensate for quite a bit of difference in basic engine airflow requiremnts (like a bigger engine). What they CAN'T tolerate is lying to them about how big the injectors are- that really drives them bonkers. A stock 305 TPI chip is expecting 19# injectors and that's what you should have in it to have any chance of the stock tune running the engine acceptably.

If you are installing bigger injectors the chip has to be tuned for them. And, of course, modified motors, bigger cubes or not, throw the stock tune out the window anyway and require custom tuning to get the most out of them.

 

http://tpiparts.net/305_tpi_to_350_tpi_conversion

this is everything i have done for the swap, all but the knock sensor

 

the knock is not the same for the 350 as the 305

 

Knock Sensor
The knock sensor physically looks the same between the 305 and 350 version, but they do are not the same. This is very important, and should not be overlooked. The knock sensor is responsible for detecting detonation. Detonation produces a specific frequency that travels through the engine block. This frequency is different depending on engine size. In addition, it is important to note that the 350 knock sensors were different between the 85-89 TPI setups and the 90-92 TPI setups. You must use the correct one for your application. The 305 knock sensors were also different between 85-89 and 90-92.

 

i know about the knock sensor i have it sitting at work on my box, but what this post is about is two things, the air intake im getting and the rich, right now im trying to figure out why i would be sucking in over 100 g/s but im sucking in at average 2000 g/s ive looked at other cars to get an idea what that should look like at idle and Ive found around 10-14 my idle is 2000 when i open the throttle i get almost 20,000