Hi Im doing a 305 to 350 tpi swap here in a month im swappin in a 350 from a 91 formula into my 85 iroc and the guy im gettin all the stuff from has a hypertech chip that he pulled from another 350, he said he would sell it to me for 35 bucks. for 35 bucks should I go ahead and do it? the only other mods im doin to the 350 are just headers. thanks for any info. im not sure what model the chip is though we both couldn't read the model number on the label as it was faded.

 

What ECM are you using the 85 870 ? Or upgraded to the 1227165? Or the as 1227730?

 

whatever the ecm is that comes with the 350.

 

85 ECM is the 1226870 86-89 is 1227165 and 90-92 sd is 1227730service number for fb. Same ema for lb9 and l98 different .bin programing

 

so should i do it? whats the benefit.

 

Should you do what? Upgradeto the 1227165? I would you can run 89 definition programing $6e no cold start injector, lean cruise mode and alot faster baud rate.

http://www.eecis.udel.edu/~davis/z28/ecm_swap/

 

You still have to re-pin the harness or run a new harness for either the 165 or 730 ecm. Why don't you do away with MAF altogether. DO the 90-92 Speed density ecm (1227730 ecm)

 

I would run the 7730 ecm with a super AUJP program.

 

I would not do the Hypertech chip. I have never heard much good about aftermarket chips. About all they can do is modify the spark tables a little.

 

If you decide to stay with the85 ECM I can burn you a hlh broadcast code, I do have a few Robinson nugget holders as well.