Can I be boosting to high due to the DumpValve spring?

So, this is a nightmare for me

I'm supposed to have the stock map on the ECU, and am boosting to 1.5BAR. Sometimes, in other gears, I will boost only to 1bar. Strange...

Can this be due to having the highest load spring on the dumpvalve?

How can I test the N75? How can I clean it?

Thanks!

 

1.5 bar is high for a k03 i would suggest getting a new n75 valve what turbo you running

 

Are you running a K04 with a Forge actuator??

 

Complicated. Substitution would be better.

 

I'm running a k04-023. We got the stock map so we could see where some problems were at.
But, I disconnected the N75, and I was boosting 0.8(the highest I saw).
What does this mean?
BTW, I changed the springs of the "Forge" DV, and it remained the same.

 

it means your actuator spring is set to 0.8bar

 

Humm..
And with the stock remap, it would set the boost to 1.5bar?
What's the stock actuator spring set for a k03?
With the N75 unplugged, am I running into limp mode?

 

normally 0.5bar (aka limp mode pressure)

 

And the limp mode is just for boost, or will it "limp" the entire remap?
So, is it ok to run it like this?

 

limp is "safe" which is N75 off so only actuator pressure.. when its unhappy with map or sensor deviations etc - self defence, self preservation mode

 

but will it enter full safe mode, or only safe regarding the boost.
My question is, running it like this, will it run as if I had the remap to boost to 0.8bar?
Or will it run like crap?

Oh, and since the actuator is set to 0.8bar, with the stock map, would it boost to 1.5bar (maybe 1.4)?
Sorry for all the questions...

 

when in limp they run fine in my experience but flat as they're producing little boost. N75 being switched off during this so no boost and fueling etc would be following boost onset... so they dont run like crap just slower.

N75 is what should be controlling the boost combined with the actuator spring load, as controlled by the ecu (supposed to)

is yours an agu (from memory) so not so much ecu refinement to log things.. no map sensor on yours?

your maf in a std size tube or not?

 

Yes, it's an AGU, so no MAP sensor.

The MAF housing is 3" SS with the stock AGU sensor.
Everytime I tried to get the 2.5" MAF housing back on, the car would bog as soon as boost started to rise. Just like when the MAF is bad.
On a AGU, seing 110 at 5K is bad?


So, from my understandig, when the N75 is off and I'm boosting to 0.8 is the same as if the ECU was remapped to boost 0.8. Is that it?

 

yes..
what I dont understand from your setup is 3" MAF tube on stock software (so scaling is wrong) and 0.8bar boost limp mode for you.. on a stock ecu?
I dont recall your full motor spec.. injectors, turbo,fuel pressure reg being ran etc..

 

K04-023, 380cc injectors, 3"MAF housing, 3.5bar FPR.

The stock map was to check why there was a problem with the timing. I suspect the timing is way to high for my car. The car pulled fine, but I could hear knock (pinging). And then I saw the timing was being pulled by the knock regulators. The car felt slugish up top, and I started to check things with VAGCOM, and I found this. So I got scared.





The remapper said I should try the stock map so we could find out what is happening. He said that the stock map is there right now, but ...

If I get the 2.5" stock MAF housing the car will just not move. If I press the accelerator all the way down, it will stop pulling. And when I take my foot off, you can loudly hear the DV working.

 

can you find another mapper?
yours does'nt seem to have a handle on things...

that ign timing looks all wrong to me
stock map, but on oversize maf tube, k04 turbo, its no wonder there's no reference to speak of.

 

For instance, if I get this image to the mapper, can he get the ignition to look the same ?



(If this is any good, of course...)

 

you would hope so yes. on onset of boost ign timing to suit - depends on his software tools and knowledge of them

 

Good. Won't you be flying in to Portugal any time soon?

 

lol, if I did I could custom code your ecu for this.. no holiday planned tho I'm afraid.