Where to find a prom for 7730 ECM (Page 2/2) Dennis LaGrua AUG 22, 02:57 PM quote by RAYDAR The Syclone/Typhoon used a 7749 ECM and a 27C128 chip. I have no idea about cross-compatibility of any of these pieces. But I wouldn't count on it. All this info comes from http://www.tunercat.com/ under "ECM Definition Files". Edit - I did find "$8F 1227727 89 - 90 Buick / Pontiac LG5 3.1L V6 MFI Turbo 27C256" 2nd Edit - It also appears that some cars used a 7727 and a 7730 interchangeably, using the same (different) code mask. So the $8F mask above may be able to be used in your 7730. Thanks for the clarification and the correction. We would not want to give out bad info. With reference to the Cyclone/Typhoon program; it is set up to manage boost and that is why I thought it may be a good starting point. To my knowledge the 7730 was not set up that way. It would require moving the main timing table over by a factor of two and splitting it for boost and vacuum readings. It can be done but the software to do it may not be readily available. Looking back at this the 7749 ECM and modifying that program may be the better choice but program compatibility needs to be explored. I use the turbo program for the 85 Fiero V6 ECM w knock sensor and that's another alternative. RacerX11 AUG 22, 03:29 PM quote Originally posted by fierofool: Adding to what Dennis said about the knock sensor. Sinister Performance told me to use a knock sensor for the vehicle the 7730 ECM came from. In my case, a 91 Beretta 3.1. That's the knock sensor I purchased. To work properly, knock sensors are tuned to a specific frequency which is dependent on the bore size of the engine. For the 92mm bore of the 3.4 engine you would want to use a knock sensor from a 93-95 Camaro V6. The 3.1 sensor would not be correct. RacerX11 AUG 22, 03:46 PM quote Originally posted by Raydar: Edit - I did find "$8F 1227727 89 - 90 Buick / Pontiac LG5 3.1L V6 MFI Turbo 27C256" 2nd Edit - It also appears that some cars used a 7727 and a 7730 interchangeably, using the same (different) code mask. So the $8F mask above may be able to be used in your 7730. The 7727 is just the underhood version of the 7730, with different connectors. $8F will run fine on the 7730. RacerX11 AUG 22, 03:50 PM quote Originally posted by Dennis LaGrua:The 7730 also uses a knock sensor and you will need the sensor and the ESC module that is essentially an A/D converter box. The sensor connects to the ESC module and the that goes to a pin on the ECM. The knock circuit for the 7730 is built into the memcal, so no ESC module needed. The knock sensor wires direct to the ECU. fierofool AUG 22, 08:57 PM quote Originally posted by RacerX11: To work properly, knock sensors are tuned to a specific frequency which is dependent on the bore size of the engine. For the 92mm bore of the 3.4 engine you would want to use a knock sensor from a 93-95 Camaro V6. The 3.1 sensor would not be correct. Thank you. Before I get mine installed, I'll question Ryan again to be sure I understood him correctly.