Guide to removing / bypassing the N249 valve.

[golfgar]

top guide mate,didnt take long

[GregUK]

so it just makes the throttle a bit more responsive? and risk of anything exploding..?

AFAIK, the AGU/ARZ doesn't have have the N249 valve, so this mod just makes the AUM/AUQ function in the same way.

[navmk4gti]

can i ask why bypass the valve?? what you get out of it  sorry dumb question :embarassed:

[GregUK]

can i ask why bypass the valve?? what you get out of it  sorry dumb question :embarassed:

The valve allows the ECU to open the DV at any time rather than allowing it to open habitually.

Bypassing the valve makes the DV more responsive, and the boost curve more smooth and progressive.

[navmk4gti]

can i ask why bypass the valve?? what you get out of it  sorry dumb question :embarassed:

The valve allows the ECU to open the DV at any time rather than allowing it to open habitually.

Bypassing the valve makes the DV more responsive, and the boost curve more smooth and progressive.

kool 

but arent there any side effects after doing this..future problems??? 

[GregUK]

but arent there any side effects after doing this..future problems??? 

It's clearly been put there for a reason, but the fact that the earlier Mk4s did without the valve is reason enough for me to bypass it!

I've not experienced, or read of anyone else having problems as a result.

[navmk4gti]

iv got a AGU 98 mk4 will mine have it den?? iv got a forge splitter d/v with no probs

[barry-gti]

i think its the ARZ's that dont have one??

[GregUK]

iv got a AGU 98 mk4 will mine have it den?? iv got a forge splitter d/v with no probs

i think its the ARZ's that dont have one??

I'm not sure which engine codes have them, but if you've got the N249, you will also have a vacuum reservoir covering your 4th coil pack/spark plug.

[navmk4gti]

ill check it out and let you guys know..