Well, I could remove or add fuel at extreme percentages and the idle would change for about 2 seconds and correct itself. I don't know man. I just couldn't get anything to happen in low throttle.

 

hmmm so what are you going to do?

 

Yes the ecu does correct itself, that's why i don't bother with low throttle corrections since the ecu is still in closed loop. The only way possible for that low throttle correction to take place is to force the ecu into open loop. One way is to remove the front 02 sensor. Then you can play with your 1000rpm in low throttle.

 

I just woke up and checked my subscriptions.....

Damn I'm cranky when I don't get any sleep.

 

Just use the Turbotrix flash for pump gas and I will use the SAFC to richen up a bit at 7200 + RPM at full throttle for safety (just because I can) and then use the other SAFC map for a full throttle race gas tune. It's all you really need. When I am ready for 40 MPG and the same performance, I will get an EMS.

 

lol 40mpg, i'm rootin for ya. 28 mpg would be a good guess.

 

**** I get 28 on the highway now. what chu mean?

 

geez, i could only pray for 28 mpg. You must never goose it, stripped the car down, took off the spoiler, and have some sort of clog on your fuel pump lol.

 

just stay out of boost and drive a 5 hour trip on the highway. it's not that involved.

 

There is no reason why you cant run 16.0 afr for highway driving. I dont know what that would equal mpg ... i would say somewhere in the 30's .. This is all on the ems ..

Mark
Turbotrix

 

I am going to run 25:1 AFR.

 

is this because the EMS can supply the least amount of fuel at every individual RPM count that is still very safe(no knock ?)?im a major rookie and this is the first i've heard of this,no flaming please im just trying to understand these concepts of tuning

 

It can be done because the EMS does what you tell it to do. The stock ECU learns in closed loop and retunes itself to factory specs.

 

You can use the low thottle setting on the SAFC2. You just wont affect much until the car goes into open loop,. which is very early on with a stock turboed Evo. My car goes into open loop at about 1 psi of boost pressure in 5th gear. If you have a wideband and a pocketlogger or some sort of Engine parameter reader, you can see it happening.

You cant get the car to cruise at leaner than stoichometric with the O2 feedback circuit still intact without getting a CEL. The ECU will monitor the narrowband O2 voltage and adjust fuel trims to bring it back to 14.7, if it has enough fuel trim left. If it can't get it back to 14.7 it will throw the CEL.

The one guy who claims you can affects things at idle is correct.

Widebandphillip: Go do this for me. Go out with your wideband hooked up, let the car warm up at idle. Go into your AFC2 and pull out %50 fuel at 1000 RPM. The ECU will try to adjust its fuel trims to bring the air fuel back to stoich 14.7, but wont be able to do it. The fuel trims if you can see them on a logger will go +25% or as high as they can go and then you will get a check engine light, telling you "TOO LEAN, Bank 1". The car will be idling like crap too.

I have found with some flashes for larger injectors the low boost open loop fuel maps are really rich. You can get rid of this by pulling some fuel on the low throttle maps.

The AFC2 interpolates between low throttle corrections and high throttle corrections to smooth out the fuel curve. It also interpolates between RPM points as well. It is like a 3 dimensional interpolation.

The AEM will let you run without O2 feedback, so you can run it as lean as you like and it wont care.

Brian

 

Pull out 50% at idle with the afc, and watch the AFR go back to 14.7 very quickly,,

Mark
Turbotrix