in my datalog at idle, my o2 showed a constant 800ish mV. could this probably be from the overlap? and why my engine runs soo rich at idle? my maf is showing around 20grams/sec on avg. should i raise the swing points of the o2 zero reference upper and lower to around 800mv as well? maybe telling the computer thats normal and not to make my car soo rich?

 

i suspect part of the reason you're rich is your injectors are quite large. probably only need 36-38 on that combo, maybe even a bit less.

but moving right along, have you burned a chip with an injector constant in line with your injector size? i haven't been on the board much lately so I don't remember your name or any history about whatyou've done, but if yo'ure trying to run this on a stock calibration, you're hosed.

 

its not stock ive been doing some tuning and im getting it dialed in (taken alot of pe vs rpm away) if i put injector constant to 42 instead of 22 it runs too damn rich and i am not sure what to change to make up for it, but leaving it at 22 and leaving the maf tables alone it cruises just fine, but at wot and off the line its slugish but im fixing the topend and now im working on bottom end.

i know the 42's are probably too big atm, but i am gonna do a power adder either nitrous or sueprcharger here shortly.

 

That's alot, IMO.
It almost sounds like you have some reversion at idle, or a mechanical/ electrical problem.

Are you sure the ecm isn't in limp home mode?.

 

If you're using an injector constant of 22 with 42's installed, you're going to have lots of problems.

If it got really rich when you put the constant at 42, you did something wrong.

A higher injector constant will make the injections shorter, not longer, so something is not right.

I'm kind of surprised it runs at all with it that way.

 

IMO, I'd get the constant set right and start dialing in the tables.Everything is skewed with the settings the way you have them. Doesn't make it any easier on you to really get the tune working.Nothing will help you if you go into limp mode. The plugs will foul if the ignition can't burn it off. Had the same issue with aprox 26# flow injectors until I put an MSD box. With my 30's now I'm concerned it can happen again. your 42's (unless running low psi) would make it easier to completly wet the plugs down.Would be nice to know which resistor in the memcal needed to change to allow bigger injectors to be run in limp.

 

i have since reset my iac and clsoed the throddle body some and brought my idle down, so i will retest my idle grams/sec for you grumpy. its not in limp home mode. no codes at all. and I dont know what to say it runs great as is, but even on a stock chip, if the injector constant is my only change, it becomes a total dog. don't know why. but if it runs good now. why change it? except to make the numbers look better. but this sounds like more work then its worth.

 

Because you're using MAF. It calculates the pulsewidth based on the injector constant. Would you rather change a coulple dozen MAF table entries, or 2 injector constants. Figure out why it doesn't run right when the numbers are right first.

 

but thats just it.. it runs fine now with stock maf tables and 22# rate in injector constant, if i just change the injector constant to correctly reflect my 42 # injectors, then the engine runs horrible. why could that be?

 

maybe your fuel pressure is way low?
hard to say.

but certainly having the injector constant that far off is not helping you and you need to get that figured out first.

are your injectors rated at the fuel pressure you're running them at?

you could also try creaping up on teh right constant to see what's going wrong. i.e. set the constant to 30#, reset the ECM (disocnnect power for 30 seconds) so it resets the learned BLM's, and see what happens.

 

see this is very odd to me because of our similar setups. (intake,cam, 42# injectors ,heads, 6e code ect) my o2 does not read at idle unless I set the injectors very low and at 22# constant it shows I am lean even though I am running rich and WOT like this pops in the exhaust and rpms climb real slow. (yes working on installing heated o2) now if I set it to 42# it idles like junk until I warm it up. I have to crack the blades open pretty far and reset the tps to compansate but has some respectable HP in wot


I get a bucking either way while at normal cruise.... anyway enough about me.....

I wonder what your bin looks like? if you want to compare some time let me know


on a side note in limp home mode it idles like a champ! rock solid! if I knew what the limp home mode setting were at I would set them in the chip that way. it seems to me that my car loves fuel as well until WOT then It can't burn it or something



on another note my grams per second are @ 7 +/-

 

shoot me your bin at my email in a zip or something, ill reply to you with my current bin. maybe we can learn from each other. right now my bin is very simple. but you never know..

 

Your MAF has some problem I think. 20 g/s at idle is about 3 times of what it should be.

Or you're flooding it soo much that it's gotta keep the IAC or throttle blades way open just to keep running.

What are the BLMs (or INT) doing at idle?

Reset the BLMs, and set the injector constant to something larger, and make sure your plugs are not all carbon fouled.

 

ill play with it tomorrow using your guys suggestions, havnt had time lately . my battery had a critical melt down (literaly)