Removing N249 valve - How To Guide

[ibizacupra]

Yes you can, of course! Though it is expensive (and too big) just to let it catching dust there IMHO.

It aint expensive.. cos its already there

 

[Shock_Xe]

ta m8

 

[Sim]

It aint expensive.. cos its already there

Hehe yes, you're right. Though if you need such a valve for other purposes (it's really an allround solendoid, selecting the path/route of air electronically) then it's there. You also would have to close/clog all of the unused ports preventing dirt getting into it and that would look awful i guess. Resistors can be more easily hidden somewhere.

 

[ibizacupra]

Hehe yes, you're right. Though if you need such a valve for other purposes (it's really an allround solendoid, selecting the path/route of air electronically) then it's there. You also would have to close/clog all of the unused ports preventing dirt getting into it and that would look awful i guess. Resistors can be more easily hidden somewhere.

just disconnected no pipes no requirement to block them.
thats what I will do when I feel the urge to do this mod

 

[Sim]

You've just disconnected it electrically or mechanically?

If only electrically, you'll have the CEL and you'll have the ~2mm restriction (id of N249 valve) to DV.

If mechanically (and left it electrically connected), that's ok, but don't know if it can get clogged with dirt (over time) and may fail to work once plugged in again. I may be too paranoid though

 

[ibizacupra]

You've just disconnected it electrically or mechanically?

If only electrically, you'll have the CEL and you'll have the ~2mm restriction (id of N249 valve) to DV.

If mechanically (and left it electrically connected), that's ok, but don't know if it can get clogged with dirt (over time) and may fail to work once plugged in again. I may be too paranoid though

mechanically.. disconnected. so no CEL's
Not done it yet but will be what I do when I get a spare few mins.


Not likely to use em again and not likely to get dirt in them so not a worry I have myself.

 

[Sim]

Not likely to use em again

Yes, good point

 

[Shock_Xe]

I started to do this today, made the Resistore board, using 3x 10w 100r as this was all they had in stock which was close to spec. Will try it, Coulednt finish it as samco tubing didnt arrive, will take pics when finished

Bought a cool bupane solder/heat knife/blow torch, awesome bit of kit!!!

Pic of my 'Box' black Metal, hopefully gonna hide it up by the pollen filter somewhere, plenty of room for products to breath

 

[Sim]

WOW! Nice box. The 33.33 Ohms may work, though a bit off spec. Inform us if ECU is happy with it or not!

 

[Shock_Xe]

WOW! Nice box. The 33.33 Ohms may work, though a bit off spec. Inform us if ECU is happy with it or not!

Yeah wasnt cheap, black steel and plenty of room for air circulation, but looks good if wanting to be displayed. Ends are screwed on and the box has internal runners to mount the breadboard on a choice of levels.

Will keep you guys informed if it works, just waiting for samco tubing to arrive

thanks Sim for all your help and patience with this

 

[LCR mat]

I started to do this today, made the Resistore board, using 3x 10w 100r as this was all they had in stock which was close to spec. Will try it, Coulednt finish it as samco tubing didnt arrive, will take pics when finished

Bought a cool bupane solder/heat knife/blow torch, awesome bit of kit!!!

Pic of my 'Box' black Metal, hopefully gonna hide it up by the pollen filter somewhere, plenty of room for products to breath

so thats what you were up to instead of meeting up eith me to do some logs

 

[Shock_Xe]

so thats what you were up to instead of meeting up eith me to do some logs

yep that and a afr gauge, and taking me ma out for lunch for her birthday

 

[cuprabaz]

what a nice guy!

 

[Shock_Xe]

what a nice guy!

lol, she provided food on the table for me plenty of times, least i can do huh

 

[Tony20VTurbo]

Could this be used as part of a knock reduction strategy?

The G60 bleeds boost off via the ISV (in certain conditions) when knock is not reduced via retarded timing.

I think it would be better to know exactly why this change has been implemented on later 1.8Ts before playing around with it? There may be reasons that go beyond it's apparent function? The engine designers know more than we do - new product features are not just added 'for a laugh'.

Good point Glen, which is what myself and Damian were asking ourselves, along with Pete from Seatowners as well

if this N249 valve has been put there on later models, it must be there for a good reason......otherwise why put it there

surely removing this must have some sort of effect or it is obviosly there to control something for safety reasons, but what for exactly

i am all for removing it, and i have read on other forums (Vortex mainly) that no error codes etc have been produced from VAG com, but still i am a bit sceptical as to what harm/damage this can do to the car, manufacturers dont just put these things in to be removed, well to a point anyway

dont think i have seen anyone quote and answer Glenns or Petes queries, although not read the whole thread

so could anyone perhaps look into why VW have put this N249 valve onto the later models and what effects it has removing it, apart from improved performance but i mean engine reliability, hope nothing to worry about as i really want to do this though

cheers

Tony

 

[Copra]

i see what your saying, but on looking at it from another angle would be; why DIDNT they put it on the earlier ones....

 

[Glenn]

If it's not fitted to non-DBW cars, it would suggest that perhaps it's some sort of safety/engine protection override in case of component failure? Only speculating here but perhaps it's triggering at the 'wrong time' due to a bug in the code? The REVO guys should know what the purpose is and what triggers it if they've disassembled the code?

 

[Sim]

The N249 valve is (should be) there for safety reasons i believe. It is there for one and only purpose: it gives the ECU control over on the DV at full throttle (when no vacuum is available). Just read my first post - it can also help N75 to regulate boost, too. Also its name "Turbo Bypass Valve" tells it all. No tuning engine wants to bypass the turbo .

 

[jonathanp]

If I wanted to do this on the LCR could I just unplug the vacuum store and put a blocked bit of samco in its place? that way if it does operate there will be no vacuum present

only problem I can think of is that when it does try and switch to vacuum will the pressure to the DV release or still be present?

 

[Sim]

Hmm, dont know. You have to "re-route" things there as the sec.air solendiod gets its vaccum from the vacuum store, too. It would throw some sec.air faults for sure.