Hi all, i have had the dreaded 17705 error for ages now. After replacing the N75, MAF and various split hoses it was still surging really bad. I remember reading a thread a while back that somebody had said take the pipe of the DV and stick a bolt in it to block it off and see if that works. After searching all day i cannot find that thread. So i thought sod it and done it this afternoon. It has stopped surging completly now! Im not sure if its a little down on power or if its supposed to be like that as im used to surging boost, limp mode etc!

Question is, will i damage anything with the pipe blocked off?

Hi all, i have had the dreaded 17705 error for ages now. After replacing the N75, MAF and various split hoses it was still surging really bad. I remember reading a thread a while back that somebody had said take the pipe of the DV and stick a bolt in it to block it off and see if that works. After searching all day i cannot find that thread. So i thought sod it and done it this afternoon. It has stopped surging completly now! Im not sure if its a little down on power or if its supposed to be like that as im used to surging boost, limp mode etc!

Question is, will i damage anything with the pipe blocked off?

Yes, your turbo's bearings and shaft wear rate will increase due to the turbo stalling every time the throttle is closed.

Also, the prob reason your car feels down on power is boost pressure will be leaking past the DV. The DV spring alone will not be enough to keep the DV closed under boost conditions (even on a car with a std map). The DV is designed to be kept closed under boost conditions by a combination of spring pressure and boost pressure applied to the top of the DV piston via the small pipe connected to the top of the DV.

Bill.

Yes, your turbo's bearings and shaft wear rate will increase due to the turbo stalling every time the throttle is closed.

Also, the prob reason your car feels down on power is boost pressure will be leaking past the DV. The DV spring alone will not be enough to keep the DV closed under boost conditions (even on a car with a std map). The DV is designed to be kept closed under boost conditions by a combination of spring pressure and boost pressure applied to the top of the DV piston via the small pipe connected to the top of the DV.

Bill.

So if i do the n249 bypass would this be better?

First thing to check with the 17705 code is the DV. It's easy to check the DV just push the piston up & put your finger over the small top pipe then release the piston, it should stay up until you take your finger off the top pipe. If it drops the seal has gone. Split top pipe to the DV is also very common.

Get a new DV. OEM DV with part number ending in 710N as fitted to 225bhp VAG engines is about £25. If you can afford it Forge 007p DV is the one most people fit, but contrary to what a lot of tuners & people claim it doesn't give any extra performance.

Edited 3 September, 201114 yr by pauldazzle

So if i do the n249 bypass would this be better?

Yes

I removed all the air pump system egr valve and both the n249 and 112 valves,

I then took the feed for the dv directly from the inlet manifold,

It did put warning light on even with resistors in but it drove fine, since had it mapped and have the everything mapped out so no warning light anymore and no buzzing noise from pump on first start up

Did the proper n249 bypass today now its surging again!? I have swapped the dv over to the oem one and still the same. Any surgestions????

Edited 3 September, 201114 yr by pokerdemon

Did the proper n249 bypass today now its surging again!? I have swapped the dv over to the oem one and still the same. Any surgestions????

Where did you connect the hose to?

Hose off the inlet maifold to the top of the dv with the fpr t off that