12 Injectors inline 6

hi,

I am currently rewiring my Nissan patrol tb48 engine I have it configured as follows I have 2 fuel rails each connected to a separate fuel tank one will be for pump gas the other is c16 race fuel, I am running the M150 and i have made a driver switch to switch between maps could i do it in such a way that when i trigger switch it switches on the secondary fuel pumps and switches of the other fuel pumps and uses 100% fuel from the secondary injectors.

If you don't want to actually use both sets of injectors in a staged configuration then yes. I'd suggest using a driver switch to switch between ignition, fuel and mixture aim tables for the two fuels. Provided the injectors are exactly the same, I'd wire the pump gas and C16 injectors to the same drive on the ECU (so both injectors on cylinder 1 are driven by Injector drive 1 in the ECU). Id then wire the power supply to the injectors separately through a changeover relay and use the same switch that you're using for the driver switch to control the relay. In this way only one set of injectors would be operational at any time.

the problem is now I have different size of injectors on each rail one has 2000cc and the other is 1600cc.

Speaking to a contact at Motec yesterday, I'm led to believe that the engineers are currently working on code for dual fuel systems right now that covers the exact scenario you're in. I have no idea where in the development phase this is though and wouldn't hold your breath.

In the current GPR package you can define primary and secondary injectors separately but the secondary contribution table (Secondary injector %) is fixed where as you really need a dual table that can be switched via a driver switch - A 2 minute job in Build but less achievable with a production package.

For now I'd almost be inclined to develop two separate tunes and just swap them with your laptop as required. The only difference would be that you can't switch maps on the fly. I'm not sure I have a better idea but I'll see if I can get BlackRex to chime in. He may have an idea I've overlooked.

Speaking to a contact at Motec yesterday, I'm led to believe that the engineers are currently working on code for dual fuel systems right now that covers the exact scenario you're in. I have no idea where in the development phase this is though and wouldn't hold your breath.

In the current GPR package you can define primary and secondary injectors separately but the secondary contribution table (Secondary injector %) is fixed where as you really need a dual table that can be switched via a driver switch - A 2 minute job in Build but less achievable with a production package.

For now I'd almost be inclined to develop two separate tunes and just swap them with your laptop as required. The only difference would be that you can't switch maps on the fly. I'm not sure I have a better idea but I'll see if I can get BlackRex to chime in. He may have an idea I've overlooked.

You called?

I have had a play around with doing this, and the best option that I have found is this.

If you do not need to change fuels "on the fly", I would have two separate packages for the M150, each tuned on the fuel needed, and setup the Primary injector resources to suit, i.e. the pump gas package uses PH Injectors 1 through 6, and the C16 package uses PH Injectors 7 through 12. This means that you can have the correct injector calibration for each injector as the primary, and you are not messing around with balance tables. If you had a PDM in the car as well, you could use that to swap the fuel pumps and injector power supply over by using a different CAN message into the PDM that switches on the relevant fuel pump and injector power outputs dependant on the fuel used.

With the different sized injectors you will need to swap the maps to do it properly, unless you use M1 Build to make a custom package to suit your requirements.

Thanks guys for the feedback......

I am currently facing another issue with the dbw and pedal from ls3 i am trying to figure out how to wire it i seem to get the pedal working in the tune when i calibrate it goes from 0 to 100 however the throttle position is all over the place it opens and closes directly it wont stay open i believe its witing related

Send an email to support@motec.com.au with the part number of the throttle body and they will send out the required information.

hi guys finally got the car to start and drive well with ls3 dbw and pump gas injectors. I just downloaded the latest Motec firmware I have also GPR package my injectors are wired now as if it is a 12 cylinder engine and I have relay switch that starts the c16 pumps and the injectors and cuts power from the pump gas injectors and fuel pumps I also have 2 fuel rails and fuel pressure sensors on each rail.

should I set it up in the tune as 12 cylinder or set them up as secondary injectors and when the switch is used it simply switches to 100% on secondary injectors. could this work and how?

note: really powerful tool here special thank to BEN for making this website and appreciate the time he spends in the webinars I got everything running on this car first time from scratch I took me 4 hours job and loads of reading and watching.