I currently have an obd-2 ecu and would like to get a obd-1...what kind of obd-1 should i get...? i have an 98 ls...

 

i'm assuming you looking for an obd-1 so that you can chip/tune?

A p28 will work for you and it's cheaper then p72.

 

He dosent even need a p72 for a non vtec motor. Just get a obd1 p75, unless you plan to chip it right away then use whatever you want...im using a phearable.net chipped p06 ecu, i believe thats from a d15 or something? on my 97 ls

 

you will need an obd2 to obd1 harness off ebay or somewhere and an obd1 p75 ecu

 

so what would be best...p75 or p28? for dyno tune?

 

and does it matter if it has come from an automatic car? if i have 5spd? what about a p06? sorry im new at this

 

You want a 5 speed ECU either vtec or non vtec. Unless you have a chip with the proper LS map burned onto it for your engine, you are limited to only an OBD1 P74/P75.

 

The P06 is a peice of junk SOHC Civic computer... 92-95 DX/LX D15B7 specifically. Your car will not run properly with that computer.

Why do want to backdate, anyway? It will only make the car run less efficiently with no advantages unless you have the OBD1 computer modified for Hondata or similar.

 

i want to be able to dyno tune it, with obd-2 it is not possible so i need an obd-1