2012 Hyundai Accent 1.6 GDI aftermarket-ally turbocharged

[NormanAlphaspeed]

https://rusefi.com/online/view.php?msq=1549

Tune

386641606_1042716446733307_5240996528231450615_n.mp4

(1.8 MiB) Downloaded 600 times

Video of a small burnout

Running a 4chan + GDi4 board

Soon more testing and hopefully more success!

[AndreyB]

[NormanAlphaspeed]

Took it to the dyno!

https://rusefi.com/online/view.php?log=1322

Tune and log

I'm running into some misfires on the upper end, and I'm somewhat sure it's due to injection angle. It might be spark gap, but I really think i'm doing bad DI math because of not-good DI experience. It's like a weird misfire, and changing injection angle definitely does something to it. Any ideas?

BTW These engines at about 21ish PSI make 220whp so 177whp without being able to rev out is pretty nice!

Videos:

[mck1117]

looking a some random highish rpm point in the log

6300 rpm, 4.8ms fuel pulse, table says 200 deg BTDC EOI

that means EOI is 20 deg before bottom dead center (a little early)

4.8ms is 181 degrees injection angle

SOI is then 381 degrees BTDC combustion, aka 21 degrees BTDC intake (injecting for the last 20 degrees of the exhaust stroke). This is dangerously early.

I suspect you're getting piston impingement and/or lighting the fuel with the leaving exhaust charge.

1. Slide your EOI later at high RPM. I wouldn't go any later than maybe -160 degrees. Try -180 and see if that improves it.
2. Add fuel pressure. This will reduce injection duration. I would try to set fuel pressure such that the injection ANGLE stays relatively constant at the same engine load as RPM changes.

[NormanAlphaspeed]

Thanks a ton for the input, it fried my brain for a few minutes lol

While moving EOI later did make it behave better, power took a very noticeable nosedive. I'm trying to wrap my head around this but I don't really get it, maybe I was missing fuel orrrrrrr idk I need to play with it some more. I'm still nervous cause this is all too new for me lol

I had a slight thought of raising fuel pressure, but i saw 100 bar as my target and started pooping my pants. I guess stock DI goes to to 150 but my brain still thinks in psi for some things.

The thing about adding fuel pressure I had literally no concept that it would work like that but it makes perfect sense, thanks again! I'll update with more news. If I can get stock power out of it I will cry tears of joy.

I THINK I can get a log of stock ECU EOI/SOI which would help me greatly.

[mck1117]

Yeah, you can log stock soi/eoi, just copy that. Also try to log stock fuel pressure, then copy that too. That should help a lot, as those tables are optimized for "don't explode the engine or have bad emissions" above all else from Hyundai.

edit: for reference, my focus ST would target 145-150 bar at full load

[NormanAlphaspeed]

I forgot I have a completley defined stock ROM for this engine... The problem is I have a sea of information

image.png (122.92 KiB) Viewed 34271 times

I did find this though, so that's one bird down:

image.png (31.99 KiB) Viewed 34271 times

Show values are in MPa

[NormanAlphaspeed]

We broke 200whp!

Thanks @mck1117!!!!!
I think we need the injectors from the turbo engine to get more, it made 200whp at only 12psi !

Log at
https://rusefi.com/online/view.php?log=1323

https://youtube.com/shorts/Dr6eXpXyzKw

[NormanAlphaspeed]

I have a question

On my street tune I had ignition timing at about 16 degrees at about 11psi. On the dyno, I kept pulling timing on the dyno until about 6 degrees, after which power finally started dropping. How tf did it not knock itself apart with 10 degrees of unnecessary timing???

[mtmotorsport]

Was it actually knocking? Modern DI engines have a pretty high knock threshold, well past MBT usually

[NormanAlphaspeed]

Was it actually knocking? Modern DI engines have a pretty high knock threshold, well past MBT usually

That's what I asked lol; how the f did it not blow up???? I can see exactly what you mean because it WAS running way past MBT. Most engines with 10 degrees over MBT at 12psi knock so loud you can hear it a few blocks away lol

[AndreyB]

it has survived the dyno session!