hello all. i was wandering if there is a good plug and play prom for a 1991 z28. it is a 305 car that has been converted to a 350. i recently changed the knock sensor and ecm/prom to the ones specified for a 350 by chev. when i did this i lost a little bit of power(any idea why this would be?). also i just converted the car from an auto to a 5 speed. i'm looking for something to boost my performance. i did notice that there was a 4 wire plug that was in the automatic tranny that i don't have plugged into any thing now as i now have a t-5 with no place for it i don't know if that would affect anything. i set the timing to 0 deg base with the tach wire unplugged. thanks for any help

 

The correct base timing for a TPI set up is 6* BTDC. That will get some of the power back.

The 4-wire onn the auto was for the TCC control. Lock up solenoid and 4th gear switch. Just wrap & tuck it up out of harms way.

The knock sensor torque spec is 11 to 14 ft/lb, not too tight. Any tighter and they become too sensitive. Reporting false knock which reduces the spark advance.

RBob.

 

thanks, excuse my ignorance what does BTDC stand for?

 

Before Top Dead Center

RBob.

 

thanks a lot i reset the timing to 6 degrees advance and it seems to have returned my performance to where it was. i took it for a good 45 min test drive and my code 43 did not reoccur so i think i got it licked. i did get a code 32 for the egr valve which isnt to surprising as the previous owner pulled the smog pump assembly . would you happen to know how to eliminate the egr checking or how to prevent the code 32 from occuring. do i need a resister or something. also is there any negative effects performance wise to having this system removed