benifits of removing n249

[terry_ibiza_tdi]

hi all ive read alot about ppl doin this but what are the benifits as im giving my car a good goin over a weekend was gona do this but if it dont do anything whats the point lol. pros and cons please thanks

 

[8bit]

None whatsoever.

OK, I did it and I noticed no benefit at all. The DV started making a strange "crack" noise when dumping tho, which didn't sound good. I undid the bypass again, DV sounds normal now. Car felt no better at all with the N249 bypassed. It's all a big myth as far as I'm concerned.

 

[t0m]

I wouldn't remove it as such unless you're going to fit a resistor in it's place - or it'll throw a throttle boost code IIRC..

I bypassed mine and it felt a lot smoother going on and coming off boost afterwards

 

[vroomtshh]

It makes the top of the engine look tidier?

If its working, leave it as it is

 

[seatcupramad23]

remove my and the bloody dv stop dumping randomly on part throttle , and also get reid off a lot weight and potential vac leaks , common cause of bad running due split vac hoses and everything becomes easier to access

 

[traumapat]

Only time mine does anything is 2mins after starting from cold, i can hear it opening the dv on part throttle as it should do... certainly has never been a problem otherwise.
Mines staying.

 

[cupraslayer]

Why do they do the bypass then? I have mine still , but have toyed with the idea of losing it. Surely if its on there , its there for a reason .

 

[seatcupramad23]

there is no real world performance he makes the bay look tidier and access is much easier to other parts

 

[Roohul]

I have bypassed the N249 (but still connected) and removed the vacuum reservoir and ran the DV straight off the intake manifold. The DV response is so much better, slightly louder too but you won't get any performance gain.

Plus all the rubbish is removed from the top of the engine and better access to the coil packs.

 

[t0m]

I have bypassed the N249 (but still connected) and removed the vacuum reservoir and ran the DV straight off the intake manifold. The DV response is so much better, slightly louder too but you won't get any performance gain.

Plus all the rubbish is removed from the top of the engine and better access to the coil packs.

That's exactly how I have mine and I've found the same findings as you.

 

[6th.replicant]

Why do they do the bypass then? I have mine still, but have toyed with the idea of losing it. Surely if it's on there, it's there for a reason.

^ Exactly.

But, hey, with millions of €s invested in R&D and legions of techies, what does VAG know? Much better to rip bits off your engine 'cos some blokes from a forum said it's a good idea

 

[Mo Arif]

Lol at some of the comments, removing the PCV is one of the best things you can do to a 1.8T proven time and time again, the fault codes can be eliminated by a simple resistor and now with the advancements of Bosch Me7.5 tuning, can be mapped out.

1. Less leaks
2. Less crap to break down and replace
3. Less clutter
4. Easier to located possible future leaks
5. Better DV response
6. Better throttle response

Man this forums changed a fair bit since I was last regularly active.

 

[csd_19]

The original reason (from a 6 year old thread on VWVortex) was purely to tidy up the engine bay, with a side effect of losing some weight (SAI weights 7-8lbs iirc)

That was all.

It came from a bunch of scene queens with mk4 Golfs who wanted to have a cleaner bay, do wiring tucks etc.

As stated many times on here and on various fora, there are no performance improvements from removing it, merely less clutter under the bonnet with less potential for leaks.

I bet if you replaced all the vac lines (seeing as the latest mk1 Leons will be 8 years old) and kept the n249 as intended you would fix undetected vac leaks and solve any running "issues"....

 

[csd_19]

The original reason (from a 6 year old thread on VWVortex)

The original original thread on there was further back in time, before the 'Tex was reorganised onto a new database....

 

[nd-photo.nl]

Lol at some of the comments, removing the PCV is one of the best things you can do to a 1.8T proven time and time again, the fault codes can be eliminated by a simple resistor and now with the advancements of Bosch Me7.5 tuning, can be mapped out.

1. Less leaks
2. Less crap to break down and replace
3. Less clutter
4. Easier to located possible future leaks
5. Better DV response
6. Better throttle response

Man this forums changed a fair bit since I was last regularly active.

10/10 would agree again

PCV system is very prone for failure (boost leaks = power loss). Resistor will not always work, I had to disable mine via the tuner

 

[6th.replicant]

... It came from a bunch of scene queens ...

 

[cupraslayer]

Well I bit the bullet last night and had this done. A very very nice chap on this forum did it for me and took him 10 mins. Now my car hasn't been running the best for a while now, but boy did it make throttle response better. Dumps louder also.
Not saying everyone should go pulling bits out, but if its running crap , then give it a go. Saves replacing parts anyway.

 

[nathan_20vt]

So does the bypass remove the pipes that run under the inlet manifold as one of them is leaking on mine and causing it to run a bit rough.

 

[Roach]

No Pcv delete removes the pipes from under the manifold.

249 bypass doesn't.

 

[t0m]

No Pcv delete removes the pipes from under the manifold.

249 bypass doesn't.

PCV delete will mean you need a catch can so it's not for everyone that one.