D1andonlyantman

Hi everyone. My injector duty is near 100% at redline. I've been tuning my ix and it was too rich there but even with the afr back to 11.5 or thereabouts I'm still in the 90s. Is that normal or could my hardwired walbro 255 be tired?

Thanks

RightSaid fred

Your fuel pressure will be all cocked up, as in too high at low load and too low at high load.
That's what happens when you hard wire the pump.
Then you'll be asking why you blew the engine.

4b11slayer

90 is ok id say. 100 doesnt leave you much room for error. Get some injectors.

D1andonlyantman

Isn't that what the fpr is for? I didn't touch the map for ages after I hardwired the pump but it was driving fine. Now I've started working on the map and the afr is even more consistent.

RazorLab

iTrader: (8)

Pay no attention to him.

RightSaid fred

100% IDC on a logger is closer to 80% because it reports wrong.
It's the difference between calculated and actual IDC.

RazorLab

iTrader: (8)

Yea, why would we trust injector pulse width. That's just silly

RightSaid fred

Of course it is..........unless you've double checked using other means......it's wrong.

Just like timing advance?


Obviously you've got no idea.


The IDC is a calculated value, not a directly measured value.
It's calculated from IPW and RPM.
IPW has 2 different values. one is the theoretical one, the other is the real one, the one with adder applied (deadtime)
IDC is derived from the actual IPW so it always displays higher than it really is.

RazorLab

iTrader: (8)

Now aren't you just a barrel of laughs...

D1andonlyantman

I was actually going to reply to this because I'm planning on finishing my map this weekend but am not really any clearer on where I stand with the IDC. So what is the verdict? Let's say when my map is done my idc touches the 90s right up top of the rpm. Is that ok because it's just a calculated number that's probably a bit off anyway and I'll rarely rev it that high, or should I consider winding back the boost or something?

Tuxevo

iTrader: (8)

You can safely listen to Razorlab. He been tuning longer than most have been driving. You'll want bigger injectors if you plan on making more power, but for now you're fine.
Static open for injectors in evoscan is something like 110%

RightSaid fred

Depends on the ROM but some of them are safe at a reading of 118%.

Obviously 118% isn't a real number, nor any other number greater than 100%.

D1andonlyantman

Ok Cool, I'll keep an eye on it. I'm pretty sure it won't be past early 90s so should have a bit of wiggle room.
thanks

shutterboy10

what type of injector do you have

D1andonlyantman

standard injectors with the standard 80 series turbo and basic bolt-ons.