NefMoto > Technical > Tuning > 06A906032HJ 5120Hack old problem and GT2871r new Problem
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Author Topic: 06A906032HJ 5120Hack old problem and GT2871r new Problem  (Read 1851 times)
Alexcsi
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« on: June 14, 2025, 02:16:01 AM »
Hello,
I need some help with an old problem and a new one. I installed the 5120 hack a year ago. Afterward, I had idle fluctuations that didn't bother me. However, I have to go to the MOT soon, and it won't pass the emissions test. If I turn on many devices with the air conditioning, it almost goes away. What could it be?

The new problem is, I've now converted to a GT2871r. I don't have any errors at 1 bar. As soon as I go outside of the boost pressure, I get the error message "Maximum boost pressure exceeded." With the old K04-001 Stage 3 turbocharger, I was running at 2.7 bar. Which map do I need to adjust?

Regards
Alex
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IamwhoIam
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« Reply #1 on: June 14, 2025, 05:37:02 AM »
So you're telling us you've managed to make a K04 based turbo at 2.7 bar but you can't make a GT2871r above 1 bar? How on earth did you manage to tune the K04 hybrid setup then? Divine intervention?
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I have no logs because I have a boost gauge (makes things easier)
_nameless
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« Reply #2 on: June 14, 2025, 09:52:59 AM »
Quote from: Alexcsi on June 14, 2025, 02:16:01 AM
Hello,
I need some help with an old problem and a new one. I installed the 5120 hack a year ago. Afterward, I had idle fluctuations that didn't bother me. However, I have to go to the MOT soon, and it won't pass the emissions test. If I turn on many devices with the air conditioning, it almost goes away. What could it be?

The new problem is, I've now converted to a GT2871r. I don't have any errors at 1 bar. As soon as I go outside of the boost pressure, I get the error message "Maximum boost pressure exceeded." With the old K04-001 Stage 3 turbocharger, I was running at 2.7 bar. Which map do I need to adjust?

Regards
Alex
Cool story!
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If you are broke or expecting free handouts DO NOT message me. I'll probably put you on blast if you do.
JeanAwt
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« Reply #3 on: June 15, 2025, 05:05:14 AM »
That's why I'm sticking with my small K03S. How do you adjust a big one if you don't know how to adjust the original? It's going to be difficult.

AC on, yes, you trigger idle and torque reserve maps.

2.7 bar?? In K04, absolute or relative pressure??!
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A4 B5 1.8T ONLY
Alexcsi
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« Reply #4 on: June 19, 2025, 12:56:37 PM »
Quote from: _nameless on June 14, 2025, 09:52:59 AM
Cool story!

this is not a story, the boost pressure was logged with VCDS
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