NefMoto > Technical > Tuning > med17.5 boost dropping off at 5,400rpm
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Author Topic: med17.5 boost dropping off at 5,400rpm  (Read 4891 times)
karlblanch
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« on: May 28, 2018, 09:11:20 AM »
I've had this car a few months now, wrote various different maps, however, I can't stop boost dropping off after 5,400rpm

Is it a mapping problem? or maybe a problem with the n75? or do I need to change boost PID?

This is the first med17.5 i've mapped, so I'm still learning

please find attached the stock, modified file and the vcds log

Any help would be great  Smiley
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vwaudiguy
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« Reply #1 on: May 28, 2018, 01:22:24 PM »
Log N75 duty.
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
Beaviz
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« Reply #2 on: May 29, 2018, 02:48:29 AM »
Stock turbo and exhaust? If yes, then it is simply just running out of puff.
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karlblanch
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« Reply #3 on: May 29, 2018, 02:39:35 PM »
I have a 3" downpipe, with stock exhaust, I've seen plenty of k03's holding at least 1 bar to redline, mine drops off to 0.5 bar

Heres a log of the n75
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vwaudiguy
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« Reply #4 on: May 29, 2018, 03:50:36 PM »
How many miles on the turbo? Might be a weak actuator. Most recent DV revision? Doubt it's anything tuning related if you're @ 95% duty and not meeting req. I didn't look though your tune.
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
Beaviz
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« Reply #5 on: May 30, 2018, 12:09:04 AM »
Quote from: vwaudiguy on May 29, 2018, 03:50:36 PM
How many miles on the turbo? Might be a weak actuator. Most recent DV revision? Doubt it's anything tuning related if you're @ 95% duty and not meeting req. I didn't look though your tune.

I agree! Not tune related.
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gman86
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« Reply #6 on: May 30, 2018, 03:00:09 AM »
"Wrote" multiple maps but not even logging in turbo mode on VCDS?

Your N75 is maxxed. You've ran out of turbo.
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littco
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« Reply #7 on: May 30, 2018, 04:59:45 AM »
Quote from: Beaviz on May 30, 2018, 12:09:04 AM
I agree! Not tune related.

I agree too. The turbo is capable of making more than the actuator is capable of holding the boost for so I almost definitely say the actuator/Wastegate is blowing open..

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nyet
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« Reply #8 on: May 30, 2018, 08:50:49 AM »
Or leak.

He didn't mention trims
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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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