Could you please share what settings are you using in the ignition tab of the vehicle settings and also your rev limiter table. That would be of great help.

How does the engine sound at 9300? can you hear/feel any valve bounce etc?

Also could anyone comment on the fluctuating map readings? I get exactly the same logs and I feel the car would behave better if we could dampen the fluctuations.... I'm guessing its all the resonance from valve overlap in the intake, but still the ecu doe not need to know about the noise. If we could smoothen it out, it would drive better I believe. Are there any trick with capacitors? or maybe relocating the map sensor and using some sort of restrictor to dampen the noise.... Please share your solutions or ideas on the subject.

 

YOU NEED TO TUNE THE FUEL SETTINGS FOR YOUR CAR



Car seems fine at 9300 RPM, but I am planning to rebuild the head sometime this winter or spring.

Just because the MAP signal fluctuates doesn't mean the EMU or stock ECU don't filter the signal or use a running average to remove peaks and troughs when calculating the injector pulse widths. The injector pulse widths do not show the same fluctuation, so my guess is there is some sort of filtering.

 

Where is your ignition cut in the vehicle settings set at?

Thanks for the map and the warning.

What's the wait time for?

How does it feel over 9000? You must have big balls to feel it going past 9 and still keep your foot on the accelerator...

 

I have the ignition cut set to 9300.

Not sure exactly what the wait time is for. I've just been using 4ms for that parameter.

I live at 5500 ft, so my MAP typically sits around 80 kPa at WOT.

 

I originally wanted to enable this functionality to allow the EMU to control the rev-limiter. The factory rev limit fuel cut sucks. I'm probably going to keep the EMU limiting the RPM to ~9000. The ignition cut style limiter maintains a much more consistent engine speed while on the limiter compared to the stock limiter.

 

My thoughts exactly. thanks for answering this. I just hope you have a decat, since raw fuel will mess up your cat converter.... I am catless...

Does it spit fire out the exhaust when ignition cut hits?

regarding the map noise.... In your log and mine too, it seems that both ignition and injectors are fluctuating, just not as violently... I still feel it will be smoother/better with some sort of smoothing before it reaches the ecu.

 

This thread is based around a rule set that doesn't allow removing the cat. So, cat is still in place for most everyone posting in this thread. No idea if it spits flames out the exhaust.

If you filter the signal too much, you'll start manipulating the signal to a point where the ECU will be calculating erroneous injector pulse widths for highly transient MAP events.

 

Congrats!

You mean tps intercept, correct? Wired same as here?

If so, that's great news! Thanks for sharing!!

In regards to supplementing part throttle tps tuning when the map is maxed out, I hear what you're saying now, and that does make a lot of sense. I have always double checked and fine tuned the part throttle AFR's after performing the WOT pulls. I still cannot say I had noticed a huge variation in AFR's where the map was maxed out, but I'll pay more attention to these areas and now we have a means to clean up the tune even more. Thanks for the fresh perspective!

 

I knew I was going quite a bit offtopic when I wrote about the decat, but since you are using ignition cut for rev limit, I wanted to mention it in case you missed the potential effect on your cat converter.

Maybe Karcept or whoever has done most of the work on the GEMU would like to start a new thread with all the breakthroughs that have been made here in regards to tuning with the GEMU. I'm a bit hesitant to do it myself as I would be "stealing" other peoples work, which I found very helpful when installing mine. Plus its probably an opportunity for someone with more professional interest to show how much he cares for the community and attract attention to his business. If noone decides to do so in due time, I will probably start one myself and try to get everything together with all the appropriate references to other peoples work offcourse .