AEM guys...come here please

[RacerXJ220]

I had a problem like that with my Stinger. I was using MSD DIS-4, and the settings for dwell were not optimal. I called MSD, got the right values, and it worked like a charm. With the wrong settings it would hit around 4,000 rpms, that's it.

I also believe it's ignitor related with just some settings in the software.

Good luck.

 

[gixxer750]

I've tried a dwell factor every where from 9 to 20

 

[figgie]

I've tried a dwell factor every where from 9 to 20

ICK!!

umm perhaps that is your problem

The dwell on the 7m ignitor is floating around 2.3 milliseconds. Any more dwell than that and you will FRY the coil (if you already did not). If I recall the AEM has it set to degrees (why I have no fricknig clue but hey!).

 

[gixxer750]

so what should it be around? They have it set at 19 in the startup cal.

 

[figgie]

so what should it be around? They have it set at 19 in the startup cal.

Give me a sec as I need to verify what they use for dwell timing.

 

[figgie]

OK WHO WAS THE INGENIUS IDIOT IN AEM THAT DECIDED TO USE DEGREES AS A COIL DWELL MEASUREMENT.

 

[figgie]

They're in his profile.

Hate to hear it Gixxer - you got PM.

Hey Gix

that ignition map. Need to interpolate it a bit more. That thing looks like a crack addict going through withdrawls designed it. To many jagged edges.

Did you try a Coil Dwell factor of 3 (I am hearing that the Dwell factor is the "time").

God I really hope you did not fry the coils.

ok.

A big problem

Dwell vs Batt table. All of it is set to 99.61%. At 14v it needs to be 100% and at 12v it needs to be higher. As the voltage goes down then the percentage of the dwell goes up. (again WHY AEM!!)
Edit NM. Seems like AEM to silly to go to 100% forget that. 99.61% is close enough! :/

 

[figgie]

Gixx

ok

I am seeing some odd things. When the problem comes in, the knock voltage goes up to 1v. At that time I see the ignition timeing go to -17 degree adtc and I can see the throttle being held at 100. This indicates that the AEM is detecting knock and pulling some major major timing at that point. Yes I know you have knock control turned off but the datalog shows otherwise.

Unfortuantly you recorded engine speed but not engine RPM.

What wideband are you using?

Ok for the fuel injection. You need to switch from the Denso that you have in the AEM over to either the Fuel injector Clinic 880 cc/min injectors OR use the RC 1000cc/min injector for the battery offset.

Ignition

Dwell v Battery setup at 100% throughout the entire thing. that is correct. Figured out the weirdness that is AEM.

The Coil Dwell factor is set to 10 right now in your CAL. 10 x 100 = 1000 microseconds or 1 milli second. You need to increase your factor to 23. leave the dwell v RPM and Dwell v Bat at 1000 across. That should net you the 2.3 ms that the coil needs. Seeing as you are at WOT at that level. What gaps re you plugs at?

Last thought.

Load up the DEFAULT MA70 calibration file(1130_Stock MAF). Load it up to the AEM. Power the AEM off and on. Once it comes back on, load your CAL file back on to the AEM EMS and power cycle again. Do the run again (dyno or road).

 

[upgradedsupra]

hmm, mine is directly in the manifold. I read that having like I do might be the problem. I still have the stumble with new ignition and coils... I fucking hate that.

You still have that issue?:aigo:

 

[gixxer750]

plugs are at .020 per aem recommendations. also... those logs shouldn't have knock...as that was sitting in neutral.. does the same in gear or on the dyno though.

-17 degrees on the log huh? seems like the alt function is playing a part...

 

[drjonez]

ah yes, AEM strikes again.....the MKIII "startup" cal is a complete joke. you're best off starting from scratch....

 

[gixxer750]

what log are you looking at? the latest one I posted has ign timing @ 24 degrees during the issue.

Wideband is the POS AEM EUGO

Look at "crank pickup" during the problem.

 

[Tun_x]

I had the same problem with my haltech it turned out to be the coil packs.. simplest way to find out is an ign scope or if you don't have access to one simply turn out the lights on your next dyno pull and watch for fireworks..
toyota coil packs don't play nicely with aftermarket ign junk ...

Jason

 

[gixxer750]

Coil packs are less than a year old

In gear, under load this thing actually hits a rev limiter. I don't think I have any "load" logs...

 

[gixxer750]

I've tried a good many of figgies suggestions, and am getting no change really. I'm not seeing the -17 degree timing, unless you are looking at a log that I may have posted with some two step action...

Try the log titled Hold on early limit...

Take a look at coils one two and three... Seems they are getting a little random and not firing every time during the problem area... also look at the crank pickup that goes zero almost the entire time during the problem area.

Edit:
Added another log on my thread on AEM forums

TunX... I'm not planning on spending another dime on dyno time until this is resolved.

 

[Mr. Y]

gixxer750
Fix your crank pickup problem! Actual timing (check with timing gun) must be exactly the same like AEM is programmed! Lock timing at 10btdc and figure your problem out!
Once again: you can't do nothing unless you get stable engine position signal from CPS in whole RPM range.

 

[gixxer750]

I still don't get the CPS deal... what else can cause that. I've tried 4 CPS's now, and one of them was BRAND new...

In case anyone was wondering, changing CPS's, Ignitors, and coil packs to multiple different ones did not give me "famous" mk3 3k RPM stumble....

 

[Mr. Y]

gixxer750 try to change air gaps in VR sensors... I mean distance beetwen magnetic pick-up and toothed wheel... Make them smaller and try... Then make em bigger and try again...
Also ensure you have VERY good ground. Poor grounding may cause a lot of electrical noise...
PS: I hope you are using shielded cable for CPS wiring?

 

[gixxer750]

I was using the stock wiring... brand new harness

 

[drjonez]

might want to check out the internal ground in the ignitor.