I'm putting Jcirc's old turbocharged 3.4l in my Fiero and picked up a 7730 ECM (the engine was already wired for it) but I need to find a prom. Anyone know where I can get one or the part number to search for?
We installed that 3.4L engine in Jerrys Fiero before he went turbo. I knew the previous owner of that engine before he sold it to Jerry. Later he went to performance shop and they installed the turbo kit and changed the ECM and I don't know what those guys did. I believe the 7730 ECM used a 27C512 eprom that can be replaced with a flash memory chip 27SF512. Those part numbers are blank un-programmed memory chips. You would then need to program that chip starting with say a code from a 4.3L GMC turbo Cyclone and then tweak the program for your engine.Point is putting in a specifically programmed chip for that engine is what is needed.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
Yep, glad someone is around from then! I appreciate the reply here. I've looked at as many of Jcirc's old threads on it as I could to get information on the engine and setup, I'm not a mechanic though I have a local shop working on it. What I have is the 3.4L from Jcirc and the Remera from Txopie, the engine and transmission are in, new axle is on, and I grabbed 7730 pictured below. My shop has a programming guy who will be working on it, they've just been having me supply the parts though so I'm trying to figure out what I need exactly.
So it sounds like the 27SF512 chip will go in the ECM pictured below, then start with the 4.3L GMC Turbo Cyclone
So it sounds like the 27SF512 chip will go in the ECM pictured below, then start with the 4.3L GMC Turbo Cyclone
That's correct but if your shop starts with the Turbo cyclone program, have them make sure that the engine has a 2 BAR MAP sensor that senses vacuum and boost. The standard Fiero MAP sensor does not. 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 BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
You need an entire memcal, not just the eprom chip.
Correct. Neglected to mention that but the Moates adapter allows you to use a reprogrammed eprom chip. Trying to erase and reprogram it while on the memcal is not the best way to do it. Here it is with a zif socket that makes removal and insertion easy
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 08-22-2021).]
If you tear apart an old ecm for the memcal connector, then you can add some spider legs to it that allows mounting the memcal base to the programmer and eliminates the need to remove the eprom chip every time you need to make a tune change. You do have to remove the stock eprom and install a flash erase version first.
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.
[This message has been edited by Raydar (edited 08-22-2021).]
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.
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.
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.
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.
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.
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.
