Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Reprogramming the Delphi ecu’s on a 650 injected Reply To: Reprogramming the Delphi ecu’s on a 650 injected
It will be hard without doing custom work to the bike involving some kind of piggyback ECU or aftermarket part to make up for the fact that airbox deletes means more air in the system but injectors are still flowing at the same rate. Engine will cook slowly and if the exhaust is too short , it affects backpressure a little bit , so it may feel a little less torquey or more “flat” if you will.
Perharps , find lighter exhausts off recent harley models and get someone to fabricate custom headers , if harley can get away with using slimmer pipes on a delphi unit ( i believe one of their models uses a delphi unit) , you could rob their exhaust setup but… the ecu may be tuned by them to deal with it. Unless you know how to access the ECU with a PC or know someone locally who does harley flash tunes, he may take a look at your ECU , do a few dyno runs with different setups OEM vs Aftermarket parts , they can tune the bike appropriately. There is a guy in Australia called Hyosung Performance Tuning , he loves his GV’s and is know to flash tune ECU’s (I dont know if you are close to him or not, as you did not mention location in your post) (Don’t worry I am fixing the forum profile pages this week!)
Pod Filters = Hyosungs have historically hated them and always ran rough , i suppose you could leave the air system as it is since the big box is tucked away under the tank and the airbox above the engine doesn’t weigh much, the bike won’t notice that kind of weight unless you are racing on a track where every milli second counts.
Biggest weight is also the wheels = here this is a totally custom job on how to find light wheels off other bikes and retrofit them to the Hyosung (lots of studying + trial and error here!) also keep in mind the speed sensor on the front wheel wants a Hyosung rim , it won’t spin on other rims to count speed unless you find a 1:1 replacement rim that slots in the Hyosung speed sensor without messing around.
Just some thoughts at 1am (im about to head to bed haha) & some ideas here! – I may have a better answer when I am more wide awake
Hapy holidays & new years 2025 in advance!
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