NefMoto > Technical > Diagnostics > Maf signal too high and overboost
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Author Topic: Maf signal too high and overboost  (Read 30257 times)
seany260
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« Reply #30 on: January 05, 2015, 07:47:27 AM »
Quote from: 10101011 on January 05, 2015, 06:44:00 AM
I'm telling you that 7 psi for full open wastegate actuator or the wastegate door. Again 7 psi at start to open and 10 psi AT FULL OPEN ON THE WASTE GATE DOOR.  THAT IS YOUR PROBLEM WITH THE OVER BOOST. I do this stuff ever day for a living ...... and no you don't use a air regulater to check the waste gate opening pressure !

Ok, I would have thought surely using a hand pump or a mini regulator with a suitable range gauge is no different as long as your getting a pressure reading just as the waste gate starts to crack?
As for being fully open at 10psi that will not happen with my actuator as the spring is stronger to to ensure boost is held, hense the reason why my car mapped the way it is.

Quote from: Fordy on January 05, 2015, 06:55:48 AM
Actuator rod length/preload needs setting correctly, do not use this to change wastegate opening pressure as Your just coil binding and reducing the wastegate opening amount

You can then change the spring rating in the actuator to change  the opening pressure from 7psi to 14psi etc

Everything you say is completely true and that is how mine is set with the stronger spring in the actuator and preloaded just enough as to not take away from stroke length. Thank you
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10101011
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« Reply #31 on: January 05, 2015, 09:18:28 AM »
The fact is you have over boost problems and i am telling you how to fix it .... Dont you think i have donre the same thing to my own first car ?? I did the same thing  your doing years ago .. many many years ago. I did the same stuff to my car you are doing right now and I had the same problems. The fact is, the acuator is too strong for the factory N75 and the hoses going to the N75 have to be 3/8" DIA. The suply hose going to the N75 has to come from the Turbo housing.... not the manifold.

The fix will be a Factory acuator . I have some WG acuators in my shop and you can have one for free if you want. The factory one does not cause boost creep or boost drop if adjusted correctly. I am trying to save you a lot of time a fustration .... the ball is in your court ...good luck


Lee
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seany260
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« Reply #32 on: January 05, 2015, 10:37:31 AM »
I 100% understand what you are telling me and have considered going back to a factory actuator in the past but a standard K03 actuator can struggle to hold 22psi. That's the reason for the stronger actuator.
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littco
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« Reply #33 on: January 08, 2015, 04:15:13 AM »
Quote from: 10101011 on January 05, 2015, 06:44:00 AM
I'm telling you that 7 psi for full open wastegate actuator or the wastegate door. Again 7 psi at start to open and 10 psi AT FULL OPEN ON THE WASTE GATE DOOR.  THAT IS YOUR PROBLEM WITH THE OVER BOOST. I do this stuff ever day for a living ...... and no you don't use a air regulater to check the waste gate opening pressure !

Ok, how can you set 7-10 psi on a 14psi actuator? You can't the base pressure on a 14psi actuator with  0 DC is 14psi.. so telling him to set it correctly to 7 psi is just nonesense, No point in telling him what to do if its not physically possible to do it!

And the reason an uprated actuator is used is because the pressures inside the turbine housing blow the stock 7 psi actuator open, Ideally a flat based 10 psi one would have been used but it wasn't available at the time and TBH it wouldn't make any difference, whether you run 21psi at 30% DC or 60% DC it's still 21psi regardless of the base actuator pressure.

I can assure you even a new OEM actuator will not hold boost at high RPM on this turbo as the wastegate will be blown open...
« Last Edit: January 08, 2015, 04:22:34 AM by littco » Logged
10101011
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« Reply #34 on: January 08, 2015, 04:27:10 AM »
Quote from: littco on January 08, 2015, 04:15:13 AM
Ok, how can you set 7-10 psi on a 14psi actuator? You can't the base pressure on a 14psi actuator with  0 DC is 14psi.. so telling him to set it correctly to 7 psi is just nonesense, No point in telling him what to do if its not physically possible to do it!

And the reason an uprated actuator is used is because the pressures inside the turbine housing blow the stock 7 psi actuator open, Ideally a flat based 10 psi one would have been used but it wasn't available at the time and TBH it wouldn't make any difference, whether you run 21psi at 30% DC or 60% DC it's still 21psi regardless of the base actuator pressure.

I can assure you even a new OEM actuator will not hold boost at high RPM on this turbo as the wastegate will be blown open...


Is the factory n75 being use ?
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littco
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« Reply #35 on: January 08, 2015, 03:23:55 PM »
Quote from: 10101011 on January 08, 2015, 04:27:10 AM
Is the factory n75 being use ?

yes, wont make any difference as they are running perfectly happily at 350-400 bhp with no issues..

Issue is the A4 BFB maps aren't fully defined and therefore it is very hard to actually get it right, unlike the BAM me7.5 which i can happily make run 24psi boost with no issues.
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