Syvecs Forums

Hi, was wondering if the following senario is possible:

8 injector setup on a Subaru, using High impedance injectors.

Primary injectors wired/fired sequentially.

Secondary injectors wired in pairs and batch fired. I notice in SCal that I can define primary injector 1-4, then secondary 1&2 to Inj5 and 3&4 to inj 6.

The reason for the question is to save two 10Amp outputs for use with DCCD and NOS.

thanks ---john---

John,

you cannot "overload" injector outputs, that is to say you cannot assign the same output to more than one cylinder. You CAN do that with an ignition output (since both wasted spark coils and distributor systems are common). Whilst you can probably build a calibration with Cylinder 1 and Cylinder 2 secondary injectors assigned to the same output, if you later program that calibration it should stop the ECU from booting until it is "fixed".

You should be able to use spare AUX outputs for the DCCD and NOS functions, or alternatively you could use one or two of the DBW H Bridge driver boards to buffer the signal from IGN outputs.

Hope this helps,

Pat.

Pat that flies in the face of my previous understanding, thought that the Aux outputs were not man enough to drive a DCCD nor NOS solenoid ?

Forgive if I've misunderstood !

---john---

John,

The AUX outputs are nominally rated at 5A, whereas the injector outputs are nominally rated at 10A. There is no difference in the current carrying capacity of the interconnects between the carrier and the control board, and if memory serves the actual output devices are the same too, we just play it safe from a thermal point of view. As long as you fit a flyback diode to the DCCD output the increased thermal load should not be significant, and the load current should be no more than 10A anyway. The NOS solenoid should not have a flyback diode and so will create more thermal loading in the voltage clamp circuits but since it will be driven at 35Hz tops rather than several hundred, and then only intermittently, I don't think it will cause a problem.

Hope this helps (but don't read it as an open invitation to load up all the AUX outputs to 10A!!!),

Pat.

Ah, thanks Pat that simplifies things. Thanks for enlightening me

cheers ---john---