I recently swapped 305 tbi for 350. I used original intake and throttle body but want to
upgrade to tpi. Is there a wiring harness available for this conversion? Also what modifications need to be done with the computer? Any and all suggestions welcome.

 

You will need a TPI ECM, harness, and possibly a fuel pump, to do the swap.

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Tim

1992 Z28, 305 TPI 5 speed, 12.1 sec @ 114.7 mph

1984 Berlinetta 305 TPI Auto, 13.8 sec @ 99.7 mph

 

Thanks, is there an aftermarket wiring harness to due the trick or do I have to go to the junk yard and get one? I thought Painless Wiring might have something but I'm not for sure. If anyone else has done this swap let me know.

 

Painless sells a MAF (60102) and SD(60103) version of the tpi harness. I have seen prices as low as $281 for the MAF Harness and $270 for the SD. The computer is 1227165 for MAF and 1227730 for SD. Pick one of these up from the pile at a yard. You also need a VATS(anti-theft) module or a chip with the VATS bypassed. You must change to a high pressure pump and hook up the fuel lines. You will need lots of o-rings and gaskets for TPI rebuild. You also may require new injectors. FMS 24# are made by Bosch and work well.
If you have more ? just ask.

John

Heart of Texas Power and Performance

 

Thanks again, that should do it for now I guess. I appreciate all the help, it was much needed.