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Tuning i20N Engine & ECU Tuning Discussion
- Thread starter POLNGU
- Start date
So I did it today. Cleaned the codes and ensured they didn’t come out again. Disconnected the battery, physically removed the tuning box and left the car approx 4 hours. Went for a drive and first full throttle very low power and same code as before (cyl 2 is where I moved the coil that was originally misfiring)
Very little doubts now. Waiting for replacement coils and plugs and will report back
Attachments
So car's been done,
They had a spot of bother trying to find a 1x1 piece of data that is limiting the boost to 19psi, the request is set to about 23psi but there's a limiter map holding it to 19 max, the car made 230hp, 364nm on "low boost"
It pulls harder for sure but considering this is about stage 1 power as it stands, I'm not disappointed at all, 40-60 in 2.4 seconds in 3rd
There is still work to be done and if anyone has any info about the boost request limiter maps please let me know!
They had a spot of bother trying to find a 1x1 piece of data that is limiting the boost to 19psi, the request is set to about 23psi but there's a limiter map holding it to 19 max, the car made 230hp, 364nm on "low boost"
It pulls harder for sure but considering this is about stage 1 power as it stands, I'm not disappointed at all, 40-60 in 2.4 seconds in 3rd
There is still work to be done and if anyone has any info about the boost request limiter maps please let me know!
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No my friend. This is way down from stage 1. A good Stage one in a totally stock car (mine), and i mean totally stock except from programming seems like the below link. Press the third mp4 file from down low (105225). Almost 240 ps with almost 400nm
https://drive.google.com/drive/folders/1ZLbDo3BI3yL5eXydXEwqpSYCdF_npspG
Good luck finding someone to tell you where the boost limiter is in the hex code. Life is a bitch huh?
https://drive.google.com/drive/folders/1ZLbDo3BI3yL5eXydXEwqpSYCdF_npspG
Good luck finding someone to tell you where the boost limiter is in the hex code. Life is a bitch huh?
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My friend, check what i had wrote to you on page 11.
"Before i altered the ignition and boost maps only to find out on the dyno that ecu is pulling ignition and boost, i would have first searched in the binary code with reverse engineering to find the hex address where the ecu is being programmed to make the safety checks, thus reduce the power, before programming the ignition and boost maps. I strongly believe thats the right way to move forward.
So tell me my friend, Instead of "life is a bitch" do you prefer "I told ya"?
The most funny part is that i can really help you, but after reading your comments from page 11 till 16 i choose not to do it and let you have some great fun
Fitted the new spark plugs and ignition coils and issue disappeared
EDIT: tuner says he recommends spark plugs replacement every 20,000 km or so
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your quote has just helped me in itselfMy friend, check what i had wrote to you on page 11.
"Before i altered the ignition and boost maps only to find out on the dyno that ecu is pulling ignition and boost, i would have first searched in the binary code with reverse engineering to find the hex address where the ecu is being programmed to make the safety checks, thus reduce the power, before programming the ignition and boost maps. I strongly believe thats the right way to move forward.
So tell me my friend, Instead of "life is a bitch" do you prefer "I told ya"?
The most funny part is that i can really help you, but after reading your comments from page 11 till 16 i choose not to do it and let you have some great fun
thanks 
I've had a joyous time with Ghidra, HxD and WinOLS
found a few 1x1 values in the image that are linked to abs manifold pressure that've been changed and still limited, i'm aware of an airflow limit in the RAM section of the .bin file but it shouldn't limit boost really until 5k onwards which is why a lot of tuners get that dip in the high revs. I'm thinking it's the MAP sensor voltage but at this point I'm not sure, still looking for that table. It's one of those, money to be made by people who do know and could lock it behind paid mappacks in the EVC portal so to be fair, it's only expected they'd keep it to themselves.
So this thread went dead for a while huh,
I never got an exact answer on the calibration area boost limit but I did go up to the lovely guys at big fish tuning!
As gpaaa mentioned, that previous tune was terrible so I'll at least give him credit for that, as much as I didn't want to accept that at the time.
Back on topic...
Big Fish ran my car as arrived tuned, stock and then applied a custom tune. Results are as follows with dyno graph below to back it up
Stock: 188hp, 317nm (not sure exactly why it was down on power but it ran healthy and it can vary so not too concerned)
As arrived tuned: 206hp, 338nm (I'm not sure where the previous tuner pulled the above 229hp and 365nm figures from, the car felt horrifically flat after 4400 RPM and actually dipped below stock peak power when it was tested, Big Fish found they hadn't touched Timing, obivously not the boost limiter, exhaust flap maps or anything really except fuel and air)
Big Fish Tuned: 234hp, 407nm - The car now feels as it should've in the first place, the pull is insane from low RPM all the way up until the ROM Encoded MAF limiter, which I'll elaborate on shortly, kicks in. Top end it makes 20hp over it did standard at peak gains are 47hp with gains being generally about 50hp all the way across the graph until the MAF limiter kicks in and it just generally feels MUCH better setting a 30-70MPH time of 4.59 seconds which is about as fast as a stock Golf R!!!)
![IMG_20251003_122757_104[1].jpg](https://n-cars.net/forums/data/attachments/27/27151-93e0685d60622c21e40f24c9708e66b7.jpg "IMG_20251003_122757_104[1].jpg")
Now...
ROM Encoded MAF Limiter. Whilst, if you know anything about this car and it's sensors, you're probably thinking... This car doesn't have a MAF sensor. In this case that's not what we're referring to. MAF means Mass Airflow. This is a value that the ECU calculates actively in the RAM segment however placed in the ROM segment of the ECU in code, which can currently only be read by a CMDFlash tool, is a nice little hardcoded limiter which is basically just a "Mass Airflow cannot exceed this number" value... I'm told it's about 600 kg/h although that's dated information and from an American tuner who only has access to the Elantra N-Line's with the same engine and the limiter isn't present in that software version.
Pretty much this needs increasing which, and I hope they don't mind as they have made it publicly available knowledge, Big Fish are working on actively and should hopefully have a customer ready patch by November.
Mass Airflow increases with engine RPM and as the turbo makes the pressure at faster and faster engine speeds it hits this hardcoded cap at around 4800 RPM and to keep the car under the limit, the turbo is told to open it's wastegate in increasing increments to reduce boost pressure to stay under that number which is why you get that ugly little dip at the end of the graphs on these cars. I can imagine the number being lower than 600 kg/h or measured in a different factor as that's near enough the efficiency limit of this tiny turbo anyway. Regardless it means we'll probably see 260hp as an absolute maximum in the UK as we don't get 102 RON fuel like Germany.
Hope that's not too much for you
Tom - @Tom_i20n on instagram
I never got an exact answer on the calibration area boost limit but I did go up to the lovely guys at big fish tuning!
As gpaaa mentioned, that previous tune was terrible so I'll at least give him credit for that, as much as I didn't want to accept that at the time.
Back on topic...
Big Fish ran my car as arrived tuned, stock and then applied a custom tune. Results are as follows with dyno graph below to back it up
Stock: 188hp, 317nm (not sure exactly why it was down on power but it ran healthy and it can vary so not too concerned)
As arrived tuned: 206hp, 338nm (I'm not sure where the previous tuner pulled the above 229hp and 365nm figures from, the car felt horrifically flat after 4400 RPM and actually dipped below stock peak power when it was tested, Big Fish found they hadn't touched Timing, obivously not the boost limiter, exhaust flap maps or anything really except fuel and air)
Big Fish Tuned: 234hp, 407nm - The car now feels as it should've in the first place, the pull is insane from low RPM all the way up until the ROM Encoded MAF limiter, which I'll elaborate on shortly, kicks in. Top end it makes 20hp over it did standard at peak gains are 47hp with gains being generally about 50hp all the way across the graph until the MAF limiter kicks in and it just generally feels MUCH better setting a 30-70MPH time of 4.59 seconds which is about as fast as a stock Golf R!!!)
Now...
ROM Encoded MAF Limiter. Whilst, if you know anything about this car and it's sensors, you're probably thinking... This car doesn't have a MAF sensor. In this case that's not what we're referring to. MAF means Mass Airflow. This is a value that the ECU calculates actively in the RAM segment however placed in the ROM segment of the ECU in code, which can currently only be read by a CMDFlash tool, is a nice little hardcoded limiter which is basically just a "Mass Airflow cannot exceed this number" value... I'm told it's about 600 kg/h although that's dated information and from an American tuner who only has access to the Elantra N-Line's with the same engine and the limiter isn't present in that software version.
Pretty much this needs increasing which, and I hope they don't mind as they have made it publicly available knowledge, Big Fish are working on actively and should hopefully have a customer ready patch by November.
Mass Airflow increases with engine RPM and as the turbo makes the pressure at faster and faster engine speeds it hits this hardcoded cap at around 4800 RPM and to keep the car under the limit, the turbo is told to open it's wastegate in increasing increments to reduce boost pressure to stay under that number which is why you get that ugly little dip at the end of the graphs on these cars. I can imagine the number being lower than 600 kg/h or measured in a different factor as that's near enough the efficiency limit of this tiny turbo anyway. Regardless it means we'll probably see 260hp as an absolute maximum in the UK as we don't get 102 RON fuel like Germany.
Hope that's not too much for you
Tom - @Tom_i20n on instagram
Watch your Language!
"As gpaaa mentioned, that previous tune was terrible so I'll at least give him credit for that, as much as I didn't want to accept that at the time."
Is your terrible first tune the only thing that you give me credit? Because from a little search i found too many posts that you are a real prick without knowing a shit about ECU tuning. For example on page 8, posts 144-148, you tried to convince the forum that 275 hp is possible with the stock turbo because .....cherry posted it!!
When i dared to tell everyone that with the size of the stock turbo this is not possible due to ....physics and mechanics, you insulted me many many times. (YNWAN who is much more clever and modest than you are, agreed with my findings- thanks god)
And this is only one incident, i can posts too many.
Question. Do you still believe that with stock turbo 275 is possible, or you have ...changed your mind, after letting you making your .......homework the hard way and pay some cash?
Because if you apologize for being a ..prick, i can tell you one or two more things which you have not seen yet in your new tune....... although i dont want to do it!!!
Is your terrible first tune the only thing that you give me credit? Because from a little search i found too many posts that you are a real prick without knowing a shit about ECU tuning. For example on page 8, posts 144-148, you tried to convince the forum that 275 hp is possible with the stock turbo because .....cherry posted it!!
When i dared to tell everyone that with the size of the stock turbo this is not possible due to ....physics and mechanics, you insulted me many many times. (YNWAN who is much more clever and modest than you are, agreed with my findings- thanks god)
And this is only one incident, i can posts too many.
Question. Do you still believe that with stock turbo 275 is possible, or you have ...changed your mind, after letting you making your .......homework the hard way and pay some cash?
Because if you apologize for being a ..prick, i can tell you one or two more things which you have not seen yet in your new tune....... although i dont want to do it!!!
I do still reckon it can do 270 odd on stock turbo in a very strong example as it's been done at klasen motors on 102 RON as well measuring 270hp. It's definitely possible, not sure how long that's going to last though. One thing I have found is the massive variance in these cars stock, where mine ran 188hp, others have ran 215 and these are the cars we'll see make the bigger power. I didn't pay for anything relating to the information I found for the record, I did pay for a professional service though. There's more than 1 genuinely verifiable example of these cars making 270+hp on the stock turbo
102 RON will be necessary to see these numbers so unless people are using Ethanol blends or are in Germany, you won't see many pushing this power.If you wanna carry this on, message me privately because I'm over desecrating this thread with this back and forth
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My friend, presicion is something very important. Because from your "reckons", to my proof is far away. I put the link of the Klassens sum up, so you can not only "reckon" but see the presice numbers for yourself.I do still reckon it can do 270 odd on stock turbo in a very strong example as it's been done at klasen motors on 102 RON as well measuring 270hp. It's definitely possible, not sure how long that's going to last though. One thing I have found is the massive variance in these cars stock, where mine ran 188hp, others have ran 215 and these are the cars we'll see make the bigger power. I didn't pay for anything relating to the information I found for the record, I did pay for a professional service though. There's more than 1 genuinely verifiable example of these cars making 270+hp on the stock turbo
If you wanna carry this on, message me privately because I'm over desecrating this thread with this back and forth
Now with your advanced Iq, you make stupid assumptions like my car ran 188hp, while others run 215, so there is a margin of 27 hp to be found, so 265 of klassen + 27 = 292!!. My friend, you are totally ignorant about science and mechanics. I am afraid things do not work like that!
But your ignorance is not what bothers me. What really bothers me is your attitude, your insults to someone who has provide very precise and accurate info based on personal research, multiple dynos and other things so as to warn users of the forum and tell them the truth.
You are so stupid, that you still believe that your car made 188, while in the first "terrible dyno tune", your cant understand that they made fun of you.
And to back up what i mean by that, check the losses of your car printed on dyno runs. On the same car , on the same dyno, losses cannot differ by 12 horsepower. In the "stock"form they present losses of 61 horsepower and after their tune, present losses of 49. To make the long story short, they had no idea and fucked your maps for good. Furthermore they fooled you by changing the losses of the car, thus presenting more power after their "tune" ( your car made stock 188 +12 of the losses they hidden = 200 horsepower)
LAST but not least, the fact is that Klassen did not achieve 275 but 264 with 102 ron once and only for testing max efficiency purposes, and every other thing you make with your mind means nothing and are only foolish assumptions.
Of cource I wont message you or wont comment other usefull things about your new "tune" because i strongly believe you have not take your lesson yet and i will let you continue the great fun factor of thinking that you know everything and i am just a prick.
Just for the record, i have measure more than 25 i20ns many many times, and all models from 2021 to 2023 had from 199 to 205 and all models after 2023 when hyundsi changed the maps had from 204 to 210
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Children, settle down.
Both your attitudes leave something to be desired. Quit the attacks and stick to the data.
and gpaa, before you build another strawman, no i didnt say mine is substantially better.
Both your attitudes leave something to be desired. Quit the attacks and stick to the data.
and gpaa, before you build another strawman, no i didnt say mine is substantially better.
I'd just like to remind you @gpaaa that every mention here of 275hp and 292hp was made by you, not by @T0m_i20N ("presicion is something very important").
T0m stated the he believed 270hp was possible as an upper limit of the stock turbo, which is not far away from the 264hp you said was achieved by Klassen (just 6hp, which is in the realms of variance that could come from ambient temps or other factors).
Edit: correction, found the 275hp post from T0m (back 8 pages) and he appears to correct himself and say crank-hp, so i think we can assume he understands 275whp isn't what they achieved. From my untrained perspective, i always assume dyno numbers are at the wheels unless its stated to be an engine dyno.
I do doubt stable 270hp is possible with that setup (or advisable to even try short term), so i'd really love to see screenshots or links to back that up (without the hearsay).
T0m stated the he believed 270hp was possible as an upper limit of the stock turbo, which is not far away from the 264hp you said was achieved by Klassen (just 6hp, which is in the realms of variance that could come from ambient temps or other factors).
Edit: correction, found the 275hp post from T0m (back 8 pages) and he appears to correct himself and say crank-hp, so i think we can assume he understands 275whp isn't what they achieved. From my untrained perspective, i always assume dyno numbers are at the wheels unless its stated to be an engine dyno.
I do doubt stable 270hp is possible with that setup (or advisable to even try short term), so i'd really love to see screenshots or links to back that up (without the hearsay).
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I think he didnt call T0m a prick.
He accused him of having low IQ, stupid, ignorant (twice), bad attitude, stupid (again) easily fooled, meaningless, foolish (again) then implies T0m thinks gpaaa is a prick.
That last one may* be true, but i dont think T0m put it in writing so doesnt count.
Edit: correction, he did call him a prick, just in a differnt post. Bu11eT, you spotted that better than me...
IMO, even if someone here is ALL of these things, it doesnt excuse poor behaviour on the forum.
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