i got my car running and my plugs got filed out a couple of times, im assuming im dumping too much fuel, is there a way to fix this problem by adjusting the injectors on my pfc??? i have installed a kg fuel kit, 850-1600cc. ems power fc. i do have a commander. i know i need to go get a tune but as for now, i will be putting more parts in, my question is how do adjust my injectors for now or to get it running right without filing out the plugs.... any help would do, thanks guys

 

Well, is the PFC set for those injector sizes? If not, well, duh, you have to change the settings!

 

the pfc is not set for those injectors, would i be able to change the setting without a wideband and datalogit. when i change the setting on the pfc, how many lbs do i set it to for those injectors, thanks rynberg for the info

 

You really need to do more research about modifications before you do them. It is clear you know nothing about the PFC or how EFI systems work -- this is not an insult, just a statement of fact.

For starters, the procedure on modifying injector sizes is covered in the PFC manual. There is no excuse not to be familiar with how the PFC works if you've installed it in your car. Like I said, you need to learn about the modifications before you do them, not after.

Secondly, there is no way to set the PFC to 1600cc injectors without the Datalogit. You can at least set the injectors to 850/1500cc so the car will actually run and cruise around.

I suggest finding someone local to help you out. Gotham Racing, Rotary Performance, Chuck (cewrx7r1) and Kyle (twokrx7) are in the neighborhood.

 

well i have tried to contact kyle, no response yet but i have changed the setting to 850/1500, primary and secondary, did mess with the other options, so i will start cleaning the plugs again ... and will find out if stay running, let me know if theres something else im missing, tthanks ...

 

well i have just tried to start it, changed the settting , prim and secondary 850/1500, and then it sounds alot worser than it did before and alot more smoke, so im guessing still dumping too much fuel, any suggestions ? i cant get ahold of any above for any help

 

At idle the engine only uses the primary injectors. I bet that you did not read up and follow the instructions in the manual. Pages 25 & 26. Most likely you did not change the primary "%" and "LAG".

If you did, then why don't you lean out the idle with the commander.

A search on 850 will give you much data.

Kyle and I are the most experienced PFC/DL people in Houston.

 

i bought the pfc without a manuel, it didnt come with one. ill check their site and take a look at it, thanks

 

This is no longer true as the programmer for this forum has hosed the search function. Entering 850 or "850" does not work anymore.

One step forward and three back!

 

Try searching for 850* instead. The asterisk trick didn't seem to work for me shortly after the site "upgrade", but it's working now.

 

primary 65.4% .4 lag
secondary 64% .10 lag

ive tried cranking the car with that setting and once i cranked, big big backfire blows and i immeditly turned off the car, and i tried cranking it again it idles but would not let me throttle. it would just studder or boggs when i tried to throttle it.... is there any settings that i can change to get my car running for daily use ? im in need and let me know if somethings wrongs ????

 

try 0.04 for primary lag and .4 for the secondary

enter 7 7 5 , top to bottom, for the injector overlaps

 

so the % stays the same while i adjust the lag ? prim 65 /second 64 %

 

By the book, only the primary injectrors have a "%" value and since both primaries are 850s, both values are the same "64.7%".

 

ok will do , will set my prim 64.7 lag 0.4 , secondary 64.7 lag .4 and see how that goes

 

.04 lag on the primary, not 0.4

This will help you lean out your idle. Then you can try the PIM map's 1000 rpm setting to further reduce fuel at idle, if you cannot reduce it enough you may want to try even less lag, perhaps negative.

 

BTW adjusting the Lag WILL mess up the drivability and the AFR through the rest of the map from my experience. You will need to adjust other stuff to make that work properly. I just decided to let mine idle high and rich as it hasn't fouled any plugs yet, and I don't drive it everyday.

Backfires and stuff sound more like another problem than just large inj. and idling rich. The 0.4 lag may be the cause, that a big difference from 0.04 where it should be, but if not I would check into other things such as is the vac. line on the MAP sensor.

 

850s for primaries are a bad decision unless absolutley necessary for added fuel.
Just causes to much tuning problems.

550/1680 will get you a lot of HP!

 

You might want to check and make sure your MAP sensor is reading properly also....Just a thought..........................

 

how can i check the map sensor on the commander? and what is it suppose to be?

well i just got to the shop...heres what i set
64.5 +.04 primary
64.5 +.04 secondary confused* +0.4 or -0.4 ????

i cant mess with the overlap map cause i dont have a DL.

 

You are still confused because you still do not understand what the manual states.
THERE IS NO SECONDARY %.

I want you to really pay attention to the labeling on page 25 to the top diagram.
There is Front Primary % and lag
Below that is Front Secondary lag
Below that is Rear Primary % and lag
Below that is Rear Secondary lag.

How can we help you if you can't read and comprehend?