Pocketlogger Accuracy on Injector Duty

[Endz0r]

is the INJD on MMCD accurate for logging? i'm hitting 100%+ on my injectors (stock :thumbdown), and i was wondering if that is accurate...

after i got my 3" downpipe, i'm hitting fuel cut like a mother trucker, and i'm guessing this is probably why.

i thought maft eliminated fuel cut, but i guess when you are hitting 100% duty cycle (i saw up to 114%), it doesn't matter.

 

[1993eclipseGS]

Where does it tell you this? i also have mmcd. The only thing i seen was injp i think. I have 1,2,3 screen of stuff to go through, the 4th one is empty.

 

[Endz0r]

i think it is INJP, i thought it was INJD, tho, lemme go check.

 

[Endz0r]

i got INJD on the first screen under TPS...weird. i went to the MMCD page and it has ISC in that spot.


edit: look what i found on the website. latest addition


04-07-2003: v1.5b
- Added injector duty cycle calculation
- Rearranged sensors (sorry) to make room for INJD

 

[psychlow]

INJP is the pulse time (in ms).
INJD is the duty cycle (in %).

How much boost are you running? I can definitely see you maxing out those 450s with your mods.

 

[TURFNNSURF]

if you follow this link you can get V1.6n for MMCd

http://www.3si.org/forum/showthread.php?t=203226&highlight=mmcd

 

[Endz0r]

INJP is the pulse time (in ms).
INJD is the duty cycle (in %).

How much boost are you running? I can definitely see you maxing out those 450s with your mods.

only 15 psi. i never got fuel cut until i got my 3" downpipe, and i could definately tell a big difference between the peice of crap exhaust shop made one and this one. i'm guessing the 3" is too big andopened up the real power of the big 16g, thus, making the injectors be maxed out and me getting fuel cut.

so does anyone know if this injd is accurate?

 

[psychlow]

At 15 PSI, you should have some headroom before fuel cut.

Have you checked for boost leaks since the exhaust install?

 

[Endz0r]

i did shear a bolt on the exhaust manifold to turbo...that's probably it.

 

[IMMORTALSPYDER]

Sorry to hijack the post, but I wish us 2G guys could see duty cycle :thumbdown

 

[Endz0r]

Sorry to hijack the post, but I wish us 2G guys could see duty cycle :thumbdown

i wish i knew if it was accurate or not.


i just sprayed some soapy water on my manifold and there is a big leak between it and the turbo

 

[steve]

The formula MMCd used to calculate Injector Duty Cycle takes the ECU's requested Injector Pulse width and the Engine RPM's and gives you the duty cycle. I haven't looked at the code for in in a while but the numbers match what I calculate when I look at my logs.

I believe IDC was added to MMCd around the 1.5 revision so used of earlier versions need to upgrade. In one of the cbatters 1.6 versions, he moved it to the second page.

So yes the numbers MMCd reports are accurate. I easily hit 100% with a B16G at 12 psi and 450's and no boost leaks. Any leaks will raise your MAF Hz and cause the ECU to want more fuel.

Steve

 

[Darksyne]

only 15 psi. i never got fuel cut until i got my 3" downpipe, and i could definately tell a big difference between the peice of crap exhaust shop made one and this one. i'm guessing the 3" is too big andopened up the real power of the big 16g, thus, making the injectors be maxed out and me getting fuel cut.

so does anyone know if this injd is accurate?

I'm hitting 109% DC in cold weather on my stock turbo and injectors at 16 psi. This is only with a RRE downpipe and 3" exhaust.

I'm surprised that your car isn't running lean with the B16G and stock injectors. Have you bumped your fuel pressure?