The official EFI Ignition map sharing thread

[spuggy]

Originally Posted by lvporschepilot

That's great info. Will look into that with AEM software. Using Motec Hall sensors for both crank and cam.

Ah, sorry, that probably won't apply then....

My cam sensor is hall effect, with Bosch mag for ref. Signal from the hall sensor is digital (6.35V or 0V), nothing in-between, it's only the mag sensor that varies output with speed/susceptible to interpreting noise as signal at cranking speed (because the voltage peak is so low there - it's over 10V peak @ 1000 RPM).

Mind, it never hurts to examine everything with a critical eye again and again...

If its only a "first cold start" and warm starts are fine, might be related to parameters for wetting the intake - MoTec has a "first pulse" to get things wet - (and a "post start" for extra fuel for a few seconds over and above warmup comp). Maybe the "first pulse" isn't enough? Hard to imagine it could inject "too much" on a single pulse

[pampadori]

This is my start tab. My engine will start almost immediately if it has any warmth in it at all. If stone cold, with itb's I also have to lightly touch the throttle to get a quick, smooth start.


Post a screenshot of yours and we can compare.

[pampadori]

Mike, I forgot that you sent me a copy of your calibration previously. So I took a screenshot of your start tab to compare to mine:

[kuehl]

Nice to see plenty of AEM here, now I don't have to call their Tech Support line as often.?

[xbmwguy]

Where are the maps for turbo guys?

[lvporschepilot]

Originally Posted by pampadori

Post a screenshot of yours and we can compare.

Going to make a couple changes to ignition timing while cranking and report back by this weekend! My 9yo broke her arm so I've been tied up with that a bit. Gracious. many thanks for posting this!

[Knockdown]

Are you getting crank timing errors while cranking the motor? I set the resync on missing crank triggers to ignore on the diagnostic page in the wizard.

[IROC 912]

Originally Posted by xbmwguy

Where are the maps for turbo guys?

I agree My car is running pretty well these days ... can keep up with a 997 Turbo through 2nd, 3rd and 4th with a 3.2L at 0.5 bar. Can only imagine what more HP would feel like.

Cold start at 10 Deg C on the first crank and smooth idle with 3.2 idle valve and PID timing control on AEM Infinity.

Start Tables below

[mikedsilva]

Originally Posted by pampadori

Mike, I forgot that you sent me a copy of your calibration previously. So I took a screenshot of your start tab to compare to mine:

Looking at my after start table, it seems that my map is pulling fuel.. is that correct? And yours is not making any changes.
Also, mine has quite a few more degrees timing when cranking..

My initial map was set up by a shop, and only the VE table has been changed by me...
Should I try your tables and see if it helps?

[pampadori]

I believe that having less Ign timing during cranking allows the engine to turn faster and be less stressful on the starter. It might have some impact on how combustion occurs at the low rpm speeds that you see when cranking the engine too.

The LamdaAfterStartTrim does appear to be pulling out fuel for up to 20 secs. Try setting those to 0 and see how it responds. The LambdaCrankingTable is also a bit leaner at the hotter temps than mine. I think mine are "out of the box" settings though. Maybe try changing those settings too.

[IROC 912]

Originally Posted by pampadori

The LamdaAfterStartTrim does appear to be pulling out fuel for up to 20 secs. Try setting those to 0 and see how it responds. The LambdaCrankingTable is also a bit leaner at the hotter temps than mine. I think mine are "out of the box" settings though. Maybe try changing those settings too.

My understanding of the afterstart trim table is that it reduces your idle lambda by the amount in the table for the duration you specify. If your idle lambda is 14.2, say from 500 RPM to 1500 RPM, it is reduced by -1.76, -1.47 to 12.44, 12.73 etc over 20 secs during warm up. This is consistent with my start up logs.

[pampadori]

Iroc, so you're saying that a negative number in the Lambdaafterstarttrim would result in a target AFR that is richer the amount of time designated? I wasn't sure if it was a percentage or what.
If that is the case, then Mike and lvporschepilot's issue are likely something else entirely.

Where is Jayson at? He'd know for sure.

What does everyone have set for their cam sync setting? the ecu will not fire inj or coils until the cam sensor is sync'd so, as I understand it, if you have a lower value it cranks less time before that sync occurs. I'm getting out of my comfort zone on this topic because I don't have a full understanding of it and how it affects the starting of the engine. I rephased my EPM so that i could use a 0 value in camsyncadjustment and I recall it starting much easier/sooner after that.

[lvporschepilot]

Originally Posted by pampadori

This is my start tab. My engine will start almost immediately if it has any warmth in it at all. If stone cold, with itb's I also have to lightly touch the throttle to get a quick, smooth start.


Post a screenshot of yours and we can compare.

This did the trick. HUGE thanks. Almost effortless now.

[mikedsilva]

Originally Posted by lvporschepilot

This did the trick. HUGE thanks. Almost effortless now.

Which tables did you use/change?

Mike

[lvporschepilot]

All of them. Just literally copied his setup and figured I would give that a whack first. Funny thing is they weren’t all that different from what I already had, but it still made a noticeable difference.

[lvporschepilot]

Question for the gallery. For throttle acceleration a/f settings, how rich do you like to see the mix get when blipping the throttle? This is the setting that mimics a carburetors accelerator pump function. Mine dips into around 10.5:1 depending on how fast I hit the pedal, which is of course all tunable. Seems to run well that way but not sure if that's entirely too rich or not.

[spuggy]

Originally Posted by xbmwguy

Where are the maps for turbo guys?

Here's mine - where's yours?



Most of the poorly-blended areas don't matter, as the motor never gets there...

[mikedsilva]

Can I ask for input on Injection Timing.

My car was tuned at a shop (but they don't tune porsches) that was willing to work with the AEM, and I am not sure my injection timing tables were modded by them, or as they came with the base tune from Aem.

Is there such a thing as a 'standard' injection timing map/table? Or does it really vary depending on your setup?

[mikedsilva]

Here is the FI Timing table I received when it was tuned.

[mikedsilva]

And I think I found the stock FI table from my initial Rasant Tune...