on the R4 software, in "view recordings", is that the injector duty cycle under Inj A & B, if so is that the % also, it says it is, but how the hell is mine hitting over 130%, is that possible?

 

Im looking at one of my recordings . On the right side..in order...top to bottom.....rpm..pressure....table A...table A Volts...table B...table B volts....Aux A....Aux B...C....D . I dont see any inj A or inj B......table A is your fuel and table B is your timing

 

in your out put settings....what is your output C mode set at ? Thats the only thing I see with a inj A or inj B

 

i have, rpm, pressure, inj A, inj B, AUX A,B,C,D

then on the far right i have Inj A, Inj A%, Inj B, Inj B%,

i have additional injector controller checked under system settings and for output C i have A and B over/latched. whatever that means,

 

That the problem...you have additional injector selected....it should be...programmable signal calibrator

 

then you will see in table A and B . what exactly what your fuel and timing is set at, at a set rpm and psi

 

it shouldnt really matter, when i called ss about the box before i installed it he said it didnt matter what it was set on,

oh i can see exactly what my fuel and timing is doing when i look at maps, that isnt affected by this, im talking about the view recordings part.

i was just wondering about the inj duty cycle, if that was correct, it cant be

you think it will change anything else if i change that to programmable signal controller now?

 

It will just change what you see. Try it...just change the settings and go back and look. I changed it , to see what you was seeing. When it reads 140%....look at where it is....its on a cell with a 10 or 10.2 or 10.4 . I know the stock ECU dumps a bunch of fuel in right before redline , and thats why we end up lowering our numbers in the cells up top

 

but do you think the factory injectors are working at a 140% duty cycle, thats crazy

 

Im guessing its putting in 40% more fuel than the stock ECU when it says 140% . Thats whats hard to figure out . How much is the SS box is [over riding the stock ECU] or [adding to the stock ECU ]

 

On the Vortech kit, the SS box does not tap into the six ECU injector signal wires, so I doubt that it knows the duty cycle. My guess is that in other applications (other cars, other kits, etc) the SS box may indeed see the duty cycle so that's why the R4 software has the option to display the numbers as such.

Booger's guess as to why the fuel numbers are lower at higher RPMs may be correct. It also might be because the Vortech FMU increases fuel pressure by a factor of 8psi of fuel for every 1psi of air--and that might be more than is needed.

--Steve

 

I think zimbo hit it on the head.

With are vortech fmu dumping 8 psi per lb of boost, the pressure is so high, that the maf signal has to be decreased so that the injectors are open shorter to keep us from running rich at the top end. Any thing less than 10 in ss sends a decreased maf reading to the ECU so that it opens the injectors less. Most of us are using less than 10 values up top to keep from running way rich.

Our problem is that we're subjecting our injectors to 100 psi or so of fuel pressure. (albeit for very short periods of time) I think we're ok on duty cycle, but we're pretty stressed on fuel pressure.