I m completly lost, injector drivers all the time are failing (stuck open) found that one of grounds was bad fixed it, again changed FET drivers and again(althow this time worked a litle bit longer) they failed for third time. Checked my wiering 10 times last time after finding faulti wire, remuwed all engines wiering and checked,and ewerithing is okay.I m wondering could the poor grounding damadge the board and thats way FET drivers keep dieing? Realy stuck with this now. ???
Not my first VEMS, others work fine.
flyback is connected or not?
yes its conected,with transient diode, and first of all power goes to flyback and only then to injectors.
Today found that protection diode on vems power suply was 30V and not 18V, i think maybe this is the cause.
When starter operates it could spike voltege wery high( i think).
Fet driver failures apparently can also damage the driver chips, resistors and capacitors. These should be replaced also, but unless you are very handy with SMD components and a fat tip soldering iron i'd suggest speaking with Vems HQ about a repair.
Poor ground can cause all sorts of issues.
My self built box suffered repeated FET failures and I ended up using IGTB's instead. When the FETS in my box died they died dead short to ground. I put my problems down to my self build box more than anything else though.
Changed the diode on power suply to 18A, changed drivers and capacitors for drivers, also aded
10uF cap. Now ewerithing is working just perfect, car is n/a 1,9 l vw 16V, 296.cams and making 205 HP on dyno at 7000 rpm. Fully sequential ignition and injection,runing on E85. For now wery pleadsed with my VEMS. ;)