AEM Ultimate Resource Thread>>>>

[mjannusch]

I've got mine set up with Boost Compensation. At the dyno I had them step up the speed hold of the dyno by 500 rpm at a time and gave it WOT on wastegate boost pressure (about 10 psi on my setup) and tweaked the fuel for my desired A/F targets. Works pretty darn well...

Then you can just set all the columns to match the row that you tweaked on the dyno, and use either Throttle Position Mod to subtract more fuel at low throttle positions to get you leaner when just cruising or at low loads - or modify the Boost Fuel Correct table (boost comp) on the low end to subtract more fuel.

Makes it dirt-simple to set up a fuelling map. The throttle-mod method doesn't work so great if you've got small turbos that spool like crazy as you could be at small throttle positions and still get lots of boost.

[pengulns2001]

yeah i use hybrid boost comp works great gets better fueling resolution too

[BlackStealth]

When I first setup the AEM EMS, it took two or three crank attempts to start my car. By increasing the crank injector time table every day I eventually was able to start my car on its first attempt. So I left my setting there and it was good for two days. But last night, the car took three cranks to start.

For those of you that have the AEM EMS fully setup, this brings up two questions. Is it normal for the AEM EMS to take long starts (ie. 4-5 seconds)? And is it normal that you have to try more than once to start?

I helped imztt setup his AEM EMS, and his car does the exact same behaviour. So I'm feeling a little disappointed with the standalone at this time.

[slava]

Originally Posted by antero

When I first setup the AEM EMS, it took two or three crank attempts to start my car. By increasing the crank injector time table every day I eventually was able to start my car on its first attempt. So I left my setting there and it was good for two days. But last night, the car took three cranks to start.

For those of you that have the AEM EMS fully setup, this brings up two questions. Is it normal for the AEM EMS to take long starts (ie. 4-5 seconds)? And is it normal that you have to try more than once to start?

I helped imztt setup his AEM EMS, and his car does the exact same behaviour. So I'm feeling a little disappointed with the standalone at this time.

Yes. Mine takes 2-4 seconds to start. When turn the key into ign pos wait for 1-2 second, aem does some initialization (my stock boost gauge jumps up and then down). Then crank the car. I did not play much with amout of initial fuel and initial inj time but it starts fairly quick when the car is cold.
Just keep in mind that this is universal EMS , it will not be 100% as stock,but as long as those not stock behaviours are acceptable I am good.

[slava]

Originally Posted by pengulns2001

yeah i use hybrid boost comp works great gets better fueling resolution too

I disagree.

Here is example. I have boost comp so at vacume of -11 (idle) AEMs substracts arond 80% of the fuel, right ( i do not have map infront of me but it should be around 80-90%).
So, my fuel map RAW value is 150. Taking 80% off and 150*.2=30
Without boost comp you will have value of 30.
Now lets look at resolution. my msecbit =40

bost comp fuel at 150 map value = 150*.00004*.2 = 0.0012
bostcomp fule at next map value of 151 = 151*.00004*.2 =0.001208

now without boost com

without boost com at 30 map value = 30*.00004 = 0.0012
without boost come at next value of 31 = 31*0.00004 = 0.00124

so as you see with boost comp you minimum step will be
0.000008 sec vs without boot com
0.000040 sec

So your resolution is not better.
One would ask, do you really need that much resolution? do not know but it is better with full boost comp map.

[pacman3000gt]

I use a hybrid boost comp because when I did a conversion from a full fuel map to boost com, it was easier to leave off-boost and idle, adjust the boost range, minimizing the throttle fuel adjustments.

[BlackStealth]

I've been researching the cranking problem and discovered something very disturbing. When I turn my key to ACC, my fuel injectors are squirting fuel . The fuel injectors shouldn't turn on until after I turn the key to cranking, and after the AEM EMS has confirmed Stat Sync'd.

I'm not the only person who has this problem, see here:
http://forum.aempower.com/bbs/viewtopic.php?t=11913

The quick and dirty solution is to set 0 fuel at 0% throttle in the Crank Injector Time Table. This now means you now need to step on the throttle in order to start the car.

I'd suggest everyone datalog and verify if this is true for you too. Otherwise your oil will get contaminated with fuel.

[mjannusch]

I guess you didn't read the thread all the way to the end.

If you don't want this behavior:

Engine Start -> Advanced Start -> Options Advanced Start

Set Crank Minimum RPM to a number greater than zero.

[pengulns2001]

my car starts in the first crank faster than stock... about the resolution, you can have a lower micro bit sec with a flatter map the reason your resolution isnt bad is because your not boosting that hight, if you use hybrid boost comp or full boost comp your map is flatter allowing a lower microbit sec, ive seen resolutions as low as 10% incriments theres really no arguing that

[slava]

Originally Posted by antero

I'd suggest everyone datalog and verify if this is true for you too. Otherwise your oil will get contaminated with fuel.

why?