Question on injector duty cycle (datalogging)

[perry2k12]

I'm pretty new to the whole datalogging thing still but I have a concern just by looking over the numbers. I'm using Livelink 6.3 with my xcal 2 and was datalogging tonight to get exact numbers on my fpdc. Well it turned out to be 90% which I wasn't exactly thrilled about. But I noticed that the parameter called "pres drop f inj" had a maximum value of 60.0000. Does this mean that my 60 lb injectors are maxed out?

 

[NateTermi]

I'm pretty new to the whole datalogging thing still but I have a concern just by looking over the numbers. I'm using Livelink 6.3 with my xcal 2 and was datalogging tonight to get exact numbers on my fpdc. Well it turned out to be 90% which I wasn't exactly thrilled about. But I noticed that the parameter called "pres drop f inj" had a maximum value of 60.0000. Does this mean that my 60 lb injectors are maxed out?

Your BAP on? 90% seems high for your setup to me.

 

[04sleeper]

I'm pretty new to the whole datalogging thing still but I have a concern just by looking over the numbers. I'm using Livelink 6.3 with my xcal 2 and was datalogging tonight to get exact numbers on my fpdc. Well it turned out to be 90% which I wasn't exactly thrilled about. But I noticed that the parameter called "pres drop f inj" had a maximum value of 60.0000. Does this mean that my 60 lb injectors are maxed out?

Injector Duty Cycle and FPDC are two different things. Your title states "injector duty cycle" and in your question you are asking about FPDC.

If your FPDC is 90%, then you still have 10% headroom. Getting up there but still a little room.

Your "pres drop f inj" is your DeltaP. This has nothing to do with your injectors maxing out. It simply is the max fuel pressure that is seen at the Fuel Rail Pressure Sensor that is commanded in the tune.

If you want to log injector duty cycle, there is a seperate PID for that as well.

 

[perry2k12]

Thanks for the responses. I kind of worded my question wrong. I was really asking about the injectors. Makes me feel a little better. How would i go about testing the BAP? It sounds high to me too considering a lot of people can run 2.3s without a pump upgrade.

 

[04sleeper]

What is your BAP set at?

 

[perry2k12]

35. This is what Bob Kurgan told me to set it at when he sent me the base tune. We never messed with it during the actual dyno tune.

 

[04sleeper]

35. This is what Bob Kurgan told me to set it at when he sent me the base tune. We never messed with it during the actual dyno tune.

Turn it to 50.

It will not affect the tune, but it will drop your FPDC.

 

[perry2k12]

Turn it to 50.

It will not affect the tune, but it will drop your FPDC.

I'll try it and let you know. Probably wouldn't hurt to install the wiring upgrade too.

 

[04sleeper]

I'll try it and let you know. Probably wouldn't hurt to install the wiring upgrade too.

Yes, that will help drop it more as well and I highly recommend it!

 

[04cobradude]

90% DC is more then sufficient...

 

[perry2k12]

90% DC is more then sufficient...

I plan to go twin screw by next year, that's why I'm concerned.

 

[04cobradude]

I plan to go twin screw by next year, that's why I'm concerned.

in my experience, a stock fuel system with 60s and a BAP at 50 will support about 630rwhp... ive done it at least 50 times.. NEVER had an issue..

thanks bob

 

[mastwolf]

Also, just a side note,

DeltaP is the Difference in Pressure between your Manifold and the Fuel pressure at the rail.

So if your running 10lbs of boost (Manifold pressure) in order to get 40lbs of differential pressure (DeltaP) You pump is making 50psi.

-Chris

 

[gamebred26]

how do you determine injector duty cycle? i have the sct x3 tuner on 03 cobra. there is a formula for it no? cause our ecus dont read injector duty cycle right?

 

[04sleeper]

They do read Injector Duty Cycle.

 

[gamebred26]

still never got an answer i think there is a formula to determine it though..anyone know it.

my ecu does not read injector duty cycle i am trying to figure out if they are pegged.

 

[encasedmetal]

still never got an answer i think there is a formula to determine it though..anyone know it.

my ecu does not read injector duty cycle i am trying to figure out if they are pegged.

if you have a returnless fuel system and SCT products- you can log injector duty cycle.

 

[gamebred26]

negative ..i have returnless. it does NOT. id love to argue this. but again. my ECU does not have it. its a 2003 early car.

 

[encasedmetal]

what are you logging with? hell, my 97 has it as an option and I have a return style

 

[gamebred26]

sct..live link ..im telling you its something with my ecu that it does not have it. you need some formula to figure it out. just trying to find out how. my tuner had a contact for it but hes not answering.

i got fpdc..but i want to find out the dc on my 60 lbers.