305tbi to 350tbi

[coreys87]

well after a lot of debating i figured im going from my tbi 305 to a tbi 350. found one with 90k miles with sm465 and tcase for $350. just checking to see if the 350 tbi will connect to the 305 connectors? thanks

 

[dhamp]

I would think so

 

[bucket]

Direct swap, if it's out of the same year. Other years may have some minor differences that still won't cause you any trouble.

 

[coreys87]

sweet. thanks, and i should be able to mildy cam it without any fuel problems right?

 

[skysurfer]

sweet. thanks, and i should be able to mildy cam it without any fuel problems right?

Get an adjustable fpr & gauge. The stock regulator's factory setting varies quite a bit, some as low as 11 psi. Set it to 13 and see how she goes. The factory pump should be able to put out around 15 psi but you'll want to run only as much pressure as necessary.

 

[coreys87]

what about switching the injector pod? think thatd work?

 

[skysurfer]

If you mean putting in larger injectors, no. The fuel delivery tables are set in the ecm and dropping in larger injectors without adjusting the prom will throw everything off. Even going with a different (albeit mild) cam is iffy at best. A custom tune after the swap is highly recommended.

 

[coreys87]

custom tune as in getting the ecm reprogrammed? might be looking into a carb with electric choke.. lol

 

[skysurfer]

custom tune as in getting the ecm reprogrammed?l

Yep, any major engine mods require a new prom to be burned for the ecm.

 

[coreys87]

where could i send the ecm for this to be done?

 

[bucket]

where could i send the ecm for this to be done?

You don't have to send the ECM, sometimes not even the PROM. You should contact Brian at TBIchips, his pricing is very fair. His website will also answer a lot of your questions.

 

[skysurfer]

Wester's Garage is also very good. There's a tbi price section on the lower half of this page.

http://westersgarage.eidnet.org/GM.html#CHEVROLET

 

[coreys87]

that or i might put a carb on with electric choke. what would i do with the extra wires tho from the throttlebody?

 

[Jims86]

you need to put the proper injectors in, 55lb per hr for the 350, and you will need a chip for the 350, which TBICHIPS will be able to help you with. Carbing it is a bad idea.