i've searched around and can't really find the correct answer. is it ok to tune with a SS box with 440cc injectors with warlbro 255lph (for a vortech)? does the ecu need to be reflash to accommodate the slightly larger injectors and if i don't reflash it and just have the ssbox tune is that ok as well? i will be looking into a utec in the near future, but for now i'm wondering if this will be safe and doable with relatively low boost

 

You will need a reflash to get the idle under control and to remove the 'advance' map which could blow your engine.

 

what about if i leave the injectors stock and install the warlbro, will the ssbox still be able to tune correctly without the vortech fmu and vortech inline fuel pump? i know someone over at 350z has the exact setup with 440cc and warlbro and ssbox and he said he didn't need a reflash, but i want to make sure. thanks

 

i didn't reflash on DW 440's and ss box with a vortech and 2.87 pulley. Idle's just fine and i'm actually still rich in my tune. Oh ya, i also have a walbro in tank fuel pump along with the vortech inline setup.

As far as i know Oldman350z (Tim) didn't reflash either and he has no problems.

I do'nt have hot start issues or anything. I didn't bump my idle up either.

I'm not sure what "advance" map the guy is talking about.

you will have to tune the stock map from vortech though. It will probably be too rich like mine was when i upgraded the injectors.

 

There are three base maps on a stock ECU.

1. Normal
2. Advance (advance timing)
3. Bad Gas (retard timing)

What you DON'T want is for the stock ECU to decide that it wants to suddenly advance timing in the middle of boost -- so what the reflashes do is erase the advance map and replace it with the modified 'Normal' map to prevent the ECU from changing parameters when it shouldn't.

Those without a reflash will probably be ok for a while (especially with another form of timing control like the SS), but it's only a matter of time before the detonation caused by your advance map are going to cause harm to your engine.

 

ah, that's why i was confused. I have an ignition map setup through the SS box. I know in closed loop the stock ecu does its own thing but i was almost certain that the SS box takes over in open loop and controls timing. Also if the stock ecu decides to over-ride it and advance the timing wouldn't it then pull the timing when it detonates?

 

The stock ECU only monitors knock under 5k so if the stock ECU is feeling happy and advancing (cold day for example) and you detonate on a WOT pull you could be in big trouble. You can be almost certain while tuning on a dyno with the elevated temps the ECU is in it's regular map.

I am not sure exactly how the SS controls timing -- if it adds/subtracts from the ECU's timing (being a piggy back, this is probably what it does) then as you can see the issue there .

 

ah, i see now. It does add and subtract from the stock ecu. When datalogging mine never gets high though. My ecu keeps the timing pretty conservative even WOT. Let me look at my timing map. ya, up in the higher boost i have around 8 degrees pulled. Probably not the best for power but it's safe. lol