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Hey all, I found romraider after a lot of YouTube and google searching regarding hacking factory ecu because I have a different project I’m trying to play with. I’m taking the best of snowmobile EFI (Arctic Cat) and trying to use parts from them to convert what I feel is one of the best engines in snowmobiling, to convert my Ski-Doo Rotax 670 rotary valve 2 stroke engine to EFI from carburetors. Once I get it to work well and function properly and get my feet wet hacking the arctic Cat M1000 ecu, I intend to turbo it. I’ve done a ton of research on it and at one point considered a centrifugal supercharger (as superchargers are usually easier to tune for) but without getting into a huge discussion regarding two stroke engine dynamics, the basics are that you need a variable restriction on the exhaust for a forced induction 2 stroke. 2 stroke running a supercharger basically blows a ton of raw fuel straight out of the exhaust. It’s been tried, variable computer controlled restrictions have been tried, among several other things, it just doesn’t work. Turbos on the other hand work beautifully on a 2 stroke, even when blowing thru a carburetor(s) as the turbine acts as a variable restrictor on the exhaust, directly proportional to the boost created by the compressor. Anyway... that’s not even something I want to mess with just yet. I want to get it running naturally aspirated first, and I have several parts I’m using from an Arctic Cat M1000, for this discussion on this forum I will be focusing on the ECU, which is technically a Suzuki part, and is a ‘Kokusandenki’ ECU. I have another Arctic Cat EFI snowmobile, and it is actually the reason I’ve chosen to go this route. It is a 600cc chassis, with a 600 EFI system, but the engine has been swapped to a 500cc from an earlier year, and it runs fantastically. It starts easily, and just runs. It doesn’t foul plugs, or anything, so I’m confident it is capable of making minor adjustments, but since I’m putting it on a completely different machine, I think I’ll need to make quite a few changes to the original code. I have a bit of knowledge in the programming aspect, I build machines (simple robotics) using arduino boards and steppers and ir sensors as part of my day job (I’m a machinist and mechanical engineer) so I’m not a complete newb to editing and writing code, but I do need help from the electrical hardware side of things, so I can set it up on a bench and do some testing, as well as the software that I’m completely unfamiliar with, when it comes to tuning ECUs. Anyone here ever mess with a Suzuki or Kokusandenki ECU?
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