I've built a 305 and a 350 in the past year. Both were carburated without any kind of computer. Now I think I have most of the mechanical theory and practice down (although I'm no expert), I'm interested in getting into the computer controlled high performance aftermarket systems. I've been doing a little reading on aftermarket Engine Management Systems. Does anybody have experience with them? When are they really necessary or a worthwhile option. I have a Chevy SB 350 that I'm thinking of building up with fuel injection at some point maybe blown or with nitrous. I was pondering getting a closed loop EMS to do it. It would go in my '84 transam. It originally came with a carburated 305 5.0 HO. Its computer isn't programable but you could get a chip burned if you installed the necessary sensors. Could you share you experiences with EMSs and opinions on when you should use them and when you shouldn't. I'm simply looking for anyone's stories on specifically installing an EMS and their decision process with going with it or deciding against it. Systems like TEC3 or Motec or Haltec and SDS. Again my 3rd gen F body is just an example. I find these systems interesting and want to hear about them in your hot rod, late model, boat, plane or whatever. Thanks. ---Rich

 

Hmm nobody in this forum has used any of these systems? That's kind of suprising.

 

I run a MoTeC M48 Pro. Its extremely flexible, relatively user friendly after the initial setup, and very good for controlling an engine on nitrous, where you want to optimize performance without the nitrous, then alter the program when you spray. I would assume that it offers the same advantage with blown engines, where you want to be able to handle setups operating in the 2-3bar range. Downside of the MoTeC is that it is expensive..... the "wideband/closed loop" option is close to $1,000 extra, for example. They also have some add-ons that can be useful... I run their IEX 8-channel ignition expander, driving 8 LS1-style coils in direct fire. They even have a full digital dash, a mini-dash integrated into a steering wheel, GPS integration, traction control, etc..... but the more you add the more it costs.

The shop that did my install is authorized installer/tuners for Accel/DFI, FAST, MoTeC, Haltech and Electromotive. They prefer the MoTeC for most high end setups, and like the Gen 7 for a more affordable setup.