Northstar rebuild: Will style (Page 116/117) La fiera FEB 14, 08:04 PM quote Originally posted by Will: Transmission or fuel injection? Fuel Injection of course! Will FEB 16, 11:46 AM quote Originally posted by La fiera: Fuel Injection of course! Northstars have always had sequential injection. The only exception is the engines that members of this forum have run with the 7730 ECM and modified $A1 code. The coil pack pictured is 8 LS coils on an original Northstar coil pack base plate. I have switched from the original waste spark Northstar ignition to LS style coil per cylinder. That's a result of using the 2006 Corvette ECM. La fiera FEB 19, 05:50 PM quote Originally posted by Will: Northstars have always had sequential injection. The only exception is the engines that members of this forum have run with the 7730 ECM and modified $A1 code. The coil pack pictured is 8 LS coils on an original Northstar coil pack base plate. I have switched from the original waste spark Northstar ignition to LS style coil per cylinder. That's a result of using the 2006 Corvette ECM. Ah ok, I didn't know that could be done! Will FEB 20, 01:11 PM quote Originally posted by La fiera: Ah ok, I didn't know that could be done! It was surprisingly easy... The $A1 mask if from DIS 3.1 V6's. Set the cylinder select to 8, then update the cylinder displacement and injector flow rates to Northstar values, use a '96-'99 throttle with IAC and it will mostly start and idle right out of the box. However, that's batch fire and does not have as robust a BLM cell setup as the $8D code for the TPI V8s. But that's ancient history... I had other things on my plate over the weekend, so I didn't make a lot of progress, but I did build the MAP sensor wiring. I'll lay it into the harness next weekend. La fiera FEB 20, 09:25 PM quote Originally posted by Will: It was surprisingly easy... The $A1 mask if from DIS 3.1 V6's. Set the cylinder select to 8, then update the cylinder displacement and injector flow rates to Northstar values, use a '96-'99 throttle with IAC and it will mostly start and idle right out of the box. However, that's batch fire and does not have as robust a BLM cell setup as the $8D code for the TPI V8s. . Will, that's like you talking Mandarin to me! Will FEB 27, 01:39 PM quote Originally posted by La fiera: Will, that's like you talking Mandarin to me! It worked as an easy button for a few people. Passed a couple more inchstones along the way last weekend. I found that my remaining 22ga PPL wire was just a little short for the VSS connection to the ECM, so I had to order a little more of that. I also found I had the wrong connector for the backup light switch and the AC compressor clutch. I ordered those as well. Those will complete the wiring that I can do with the engine on the bench. I also modified the shift cable retainer from Rodney Dickman's short shift kit to clear the MAF sensor. Next weekend is drill. The weekend after that (3/09), laying in the wires for the VSS and the backup lights should go quickly. I should be able to get the powertrain on the cradle that weekend, maybe even go for the first test fit. I still have to trim the decklid hinge box a little bit, but fine tuning that should be the last metal cutting I need to do. Will APR 11, 11:07 AM quote Originally posted by La fiera: Ah ok, I didn't know that could be done! Oh yeah, once GM went to the 58x trigger wheel across their entire product portfolio, almost any ECM can run almost any engine, with considerations for installed equipment like variable cam phasing. Trinten APR 12, 09:48 PM I understand that one of those limits is how much boost the GM ECMs can see, even when setup with the correct MAP sensor? Originally we were trying to go with a stock ECM that we hoped we could 'trick' or tune into running our setup with the 30psi boost ceiling, as well as the 4T80. We started looking at aftermarket controllers after we were told there wasn't a way to get the GM units to "correctly" read/manage that much boost. Was I misinformed? Will APR 13, 08:37 AM It's more a matter of the combination of features. The 2006 Corvette ECM can run a fixed cam Northstar because both engines are V8s without variable cam phasing. The later RWD Northstar has variable cam phasing and is the only 4 cam VVT V8 GM built (until the new LT6...) and thus requires that OS (and maybe that specific computer as well). 30 PSI of boost is 3 bar of MAP. GM does ship engines with 3 bar MAP sensors. By the time GM started building turbo 4's that ran over 15 psi, those same engines were also running direct injection. I'm not sure if DI drivers can run port injectors or not. They were also 4 cylinder engines may not have enough drivers to run 8 injectors or coils (although LS coils only require a logic out, not a driver) You may be able to use an LS9 or LSA OS in the right GM computer to run your engine, but I don't know if they go to 2 bar or 3 bar. Remapping a 2 bar map to 3 bar is an advanced tuner skill, and finding a tuner willing to do that when he can sell you a much more expensive aftermarket ECU instead is rare. Trinten APR 13, 10:38 AM Got it! Thank you for the explanation and the examples, details like that are really useful context to help me learn/understand.