sereneseven

Hello, I have searched on this subject but have not come up with any luck.

I am having problems getting my idle and free revving light load areas to lean out (P4-5 X N2-7)

I am running a FD with a street port,DP,MP,CB,blocked emissions,99 turbo's seq.,PFC w/datalogit, stock FP,Stock injectors,SMIC.

with inj lag set to default 0 I can adjust idle to about 12.5afr(not bad pretty smooth) however free revving the engine up through 3000rpm (p7) it goes to about 11.0 . as a test I lowered the base map cells in that area to .100(shouldn't even run)....well the afrs stayed the same? I have double checked all other correction tables to make sure I'm not fighting one of them and fuel pressure seems fine.

As another test I lowered the lag time and ended around -0.20 which allowed me to lean out the above mentioned area's however now if I try and hold very light throttle around 1200rpm it feels like the IAC is fighting and the engine starts bouncing up and down between 900 and 1400...as soon as i let off the gas it drops back to idle like normal

This is really driving me nuts! I'm running stock injectors and I can get enough fuel out at idle, why can't I get enough out above idle with out Negative lag???? and why does Negative Lag cause the IAC to start bouncing the rpms when I try and hold just off idle rpms.

Please throw me some idea's

thanks

Tyler

cewrx7r1

iTrader: (2)

If you have a DL, attach yout DAT.

sereneseven

here is the .dat that I have been trying to lean without success...no matter how much you lower the inj or base in the lower load cells the afrs stay around 11.0 with the default lag...I can get the idle to lean to around 12.2 and seems smooth. I did not save the DAT with the negative lag...all I did is drop lag untill the 2000rpm-3000rpm range leaned out and then bumped up the idle....thats when the goofyness started with the just off idle fluctuations. ignore the timming I was moving it around seeing if it would have any affects.....for that matter ignore most of the base I have been moving big sections just trying verify this wierd fueling thing

thanks for any insight

rynberg

What is with the anti-lag values? Perhaps those are messing with the map?

I can't see your problem but your timing is JACKED and should be fixed immediately.

sereneseven

Hmmm thats just the default anti-lag value....niether is turned on plus I thought they didn't work?? did you just set them to 1.00?

LOL yes I know the timming on that .dat is all fucked up...I moved it all over the place just to see if for some reason the PFC wasn't recognizing my changes in certain cells....Like I said ignore it.

AND last but not least call off the help for the time being unless you see something that just lookes way wacked, I may have found the culprit...... the front secondary injector is leaking a bit through the pintle (about a drip every 10 seconds) not sure if this would be enough to explain all the issues I am having but it doesn't make much sense to try and trouble shoot with that going on.....Really pissed since RC cleaned and flowed them only10K ago.

thanks for the help everyone

Tyler

cewrx7r1

iTrader: (2)

I noticed that you are using SETTINGS 3 OPTION 5 in the PIM SCALE/OFFSET table with values of 35807/3300.

If you have calibrated your stock map sensor to be correct, then you should have also changed the values in the MAP REF table to correpond to the sensor values,
specially for boost. This did not cause you problem, but is just a mismatch which has not solved anything.

The PFC will only allow so much fuel taken out of the BASE MAP even if you try to take out more. Then you have to use the INJ ADJUST table by RPM.

MAYBE you have leaking injectors.

CR500FD

serene,

my car does the exact same stuff, no one has been able to fix it (BDC tined)

are you in north Charlotte?

sereneseven

Yeah I was playing around with the PIM's but than got side tracked on this problem... So yes I do have a leaky injector...found it about 2am...so I will need to fix it before I continue. Thanks for the tip on the inj Adjust table i actually did not try this......I figured the base map have full control

Question....why doesn't the base map have full control?? anyone know

thanks

sereneseven

RACE CITY!


Maybe you should try the inj correction table mentioned above.....BDC didn't tune up your drivability ??

cewrx7r1

iTrader: (2)

There are a few oddities with the PFC:

When you use the ISC to control the three idle speeds, the PFC does not run the timing that you see in the IGL/IGT maps for idle. If you change all three to "0", which allows manual idle control, then it uses the timing as you have it.

The PFC will not lean out the primary injectors beyound some unknown value even though you reduce the values in the base map. That is why tuning 850 primaries can become traumatic.

By 5200 rpm, the PFC normally has added two degrees more timing than what is in the IGL/IGT tables.

sereneseven

thanks for the info....is it known if these limitations are do to the DL interface or are in the pfc?? example; are the apexi licensed tuners with the full software faced with the same limits?

cewrx7r1

iTrader: (2)

The PFC is the cause not the DL. It will still happen using the commander.
I do not know if APEXI's software can overcome this. The DL killed Apexi's FD tuning clientel as I never heard of anyone using them to tune a FD.

sereneseven

Ok $650 in injectors(brand new later and I now have a noticably smoother idle and am a 1/2 a point leaner .....BUT this still leaves me at 11.5 in the above mentioned areas. to clarify...I am sitting in the garage and simply holding different rpm's as soon as i move above 1500rpm the afrs go rich and engine picks up slight miss when held at steady state above 1500rpm. I tried holding 2000rpm and went to -.30 Lag which got my afrs to around 13.00(about where i would like to be) however the engine still seemed to miss a little (secondary question) is this slight miss simply due to it being a street ported rotary?....engine is smooth as long you are under some load.

as cewrx suggested I tried to lower the inj vs rpm.....no change in AFR's
I also tried the inj vs PIMv again no change

so now I am back where I started....the realy confusing thing is why does the base map affect idle(I can lean it out till it dies) but not the free rev range above idle.

Again thank you to all for any thought's / suggestion's

cewrx7r1

iTrader: (2)

Sometimes a percieved problem is just a lack of experience.
This type of proplem can only be solved by an experienced person doing the tuning by changing mutiple settings.

The only times I seen problems like this were caused by leaking injectors or bad ignition.

Sometimes the PFC can go whacky and do weird things. Save you DAT file, re-initialize the PFC and see if you can get it to properly idle. Then re-enter the other changes to make to map the same again.

Or pay for someone like me to come fix it for you, HAHA!