steven121

iTrader: (27)

My only issue Im having before I can jump into tuning

My idle trim is maxed out at -12.50 when I lower my ve rpm table they drop, but my idle is very lean i have to press the gas for it to get back to 14.7.

How did you guys combat this issue? Trying to get to -/+ 5% combined with idle and cruising together

I tried messing with the sd ve map by raising the load portion it would drop more but not where I want it to be at. And if I keep raising it my trims would go back up.

Trying to understand
Rpm ve table
Map ve
Apparently maf scaling as well for idle trims


Yes I read every thread but it does not specifically mention this issue

jeffbeagley

Post up your current kpa to load and rpm vs load tables.

You shouldn't adjust those tables first to get your idle trims in check. Use injector scaling to get it close, then adjust latencies appropriately. Then use the other tables to make finer adjustments.

Start off with kpa to load as a 1:1 and your lower rpm VE should be in the high 80s lower 90s.

Sent from my SM-N900V using IB AutoGroup

charlie.tunah

iTrader: (7)

No. Don't do a thing to the injector scaling if youre on stock injectors or had good fuel trims on the maf with the same injectors.

Post up your kpa-load map and rpm ve map. Every other MAF scaling or compensation/smoothing table should be stock before you start tuning.

Disable closed loop and see what the wideband reads. Also, make sure you don't have any pre o2 (stock or aftermarket) exhaust leaks.

jeffbeagley

My little knowledge comes from tuning without a MAF setup at all.

steven121

iTrader: (27)

I have 1000cc injectors and they were tuned for whn I was on the maf

steven121

iTrader: (27)

ok im wondering if I should lower the rpm ve to get it to 14.7 afr during the start up and also a good idle, and log the trims, then go for the injector scaling and latency?

or leave it on the stock tephra speed density then tune injector lantency and scaling.

charlie.tunah

iTrader: (7)

If his injectors were tuned prior to SD, he doesnt need to touch the latencies or scaling. Everything you need is in the kpa-load, RPM VE and MAF compensation/smoothing tables.


Hard to read your screenshot, but it appears that you are running 1:1 kpa-load and your RPM VE peaks around 90?


If so, leave the kpa-load alone. I agree that VE should be in the 80s or low 90s at idle. But that will make your situation worse. Are your MAF scaling and compensation/smoothing tables stock?


Forced open loop for the entire time you are tuning SD. If your WB is not out of calibration and you don't have any exhaust leaks, you should tune it so your WB reads 14.7, then the fuel trims will be fine. Otherwise you chase your tail with the fuel trims fighting you.

charlie.tunah

iTrader: (7)

What does "very lean" mean?


So you say that when you drop RPM VE, the trims go towards 0? But your wideband reads more lean? And when you give it gas, the wb shows 14.7 and trims are still in check?


If so, you might have a small exhaust leak before your WB. Mine acted the same with a leaky dp-o2 housing flange. Always idled at "16.5", yet as soon as I started cruising or holding the throttle it would be at 14.7.

steven121

iTrader: (27)

-----No leaks seems to be when i first start the car and it idles


Should i be in open loop when trying to tune this speed density?

charlie.tunah

iTrader: (7)

yes

steven121

iTrader: (27)

Then problem solved I can figure everything else from here lol