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n249 bypass
- Thread starter kennyrodgers84
- Start date
Did mine last week and the only difference I have noticed is the DV is now slighly louder, expecially at higher revs
Deleted member 20376
Guest
Yea, if you need a hand I've got a fair few tools in Lboro these days
sweet cheers mate.
tbh i didnt really notice much from mine as my dv was quite loud for a forge 007 anyway hard to say with boost wise without having a boost gauge.
bathrumble
Guest
Did mine a while back and it definatly releases quicker now and i think its a better sound and maybe even slightly louder, cant say ive noticed alot of difference driving wise though.
i have this same problem ! its a pain in the ass to drive en 1th. between speed bumps and i look like and idiot who cant drive when the power cuts.
So if this mods helps i would be glad ;D trying it out to night
for me its the reverse..car was smooth before the bypass, afterwards it jerked/stuttered and i couldnt hear the dv loud enough. eventually i thought enough was enough so switched it back. and im glad i did.
hmmmmmm
Ahh thats a bummer, dont know how I'd manage if I couldn't hear my dump valve when I was reversing!
haha!
Anyway,
I just tried this today, and to be honest I'm split as to whether or not I prefer it bypassed....
Dump valve definitely sounds different, although to be honest I don't think it releases any quicker... (I'm presently using very thin vac hose, as unipart only had about 2mm in stock, so this might explain why it is a little delayed in opening) although I see what people mean about the 'crack' sort of sound it makes when dumping, sounds quite nice...
I originally just stuck the whole metre of hose on, and there was a slight bit of turbo chatter when letting off (like half a second of chatter, followed by dump) which you can now barely hear after cutting pipe short... which makes me wonder if the crack sound we can hear is just a combination of a split second of turbo chatter (one or two chambers venting back up the TIP) followed by the DV...
I know that people say the DV should react quicker with all the boomf bypassed, but I do wonder if this is infact the opposite, and with the help of the vacuum reservoir, the N249 actually manages to open the DV quicker? the reservoir acting as a store of extra vacuum to suck the DV open sooner?
Obviously, being a bit of a retard, I have no mechanical back up for this, just a few thoughts going through my head after having a listen tonight....
Views on this anyone?
Ahh thats a bummer, dont know how I'd manage if I couldn't hear my dump valve when I was reversing!
haha!Anyway,
I just tried this today, and to be honest I'm split as to whether or not I prefer it bypassed....
Dump valve definitely sounds different, although to be honest I don't think it releases any quicker... (I'm presently using very thin vac hose, as unipart only had about 2mm in stock, so this might explain why it is a little delayed in opening) although I see what people mean about the 'crack' sort of sound it makes when dumping, sounds quite nice...
I originally just stuck the whole metre of hose on, and there was a slight bit of turbo chatter when letting off (like half a second of chatter, followed by dump) which you can now barely hear after cutting pipe short... which makes me wonder if the crack sound we can hear is just a combination of a split second of turbo chatter (one or two chambers venting back up the TIP) followed by the DV...
I know that people say the DV should react quicker with all the boomf bypassed, but I do wonder if this is infact the opposite, and with the help of the vacuum reservoir, the N249 actually manages to open the DV quicker? the reservoir acting as a store of extra vacuum to suck the DV open sooner?
Obviously, being a bit of a retard, I have no mechanical back up for this, just a few thoughts going through my head after having a listen tonight....
Views on this anyone?
Jenko
Guest
Hello all.I know this may sound dumb but what exactly do I need to do the n249 bypass?I've heard alot of talk about it but don't actually know wat it requires.I've got a mk3 Ibiza cupra and would like to make a few cheapish mods to make it that bit quicker! If anyone could explain I'd b very grateful.thanx
This is certainly an interesting thread.
Seems that there's quite a split in opinion/results when doing this mod. Some seem to say it improves things while some say it makes things worse (or could make things worse).
I also always take note of what mechanics and the like say about such things and the Forge guys don't seem keen on it...
I do however wonder if this bypass would "fix" the slight delay in response I get (which many have said it does improve).
For those that have done it, as of June 2010, what are peoples opinion on this now?
Seems that there's quite a split in opinion/results when doing this mod. Some seem to say it improves things while some say it makes things worse (or could make things worse).
I also always take note of what mechanics and the like say about such things and the Forge guys don't seem keen on it...
I do however wonder if this bypass would "fix" the slight delay in response I get (which many have said it does improve).
For those that have done it, as of June 2010, what are peoples opinion on this now?
im still split between which is better....
If you have ever had the problem of coming off then straight back on the throttle and having the DV open for about 2seconds under full throttle... The bypass seems to put a stop to this, which is good and obviously makes the car more responsive... However, when coming off the throttle, it is harder to do it gently for some reason; this combined with the slight bit of turbo chatter you get a split second before the DV opens makes me think the bypass makes the DV slower to respond when it needs to open, possibly causing damage to turbo.... It is also possible to get chatter when coming off the throttle under part acceleration which I never got before the bypass...
I am tempted to put my green spring back in with the bypass to see if this improves that problem....
Dont suppose this has helped you as its by no means an argument for or against! its nice to get rid of the annoying n249 interference, but I am not convinced its good for the car!
If you have ever had the problem of coming off then straight back on the throttle and having the DV open for about 2seconds under full throttle... The bypass seems to put a stop to this, which is good and obviously makes the car more responsive... However, when coming off the throttle, it is harder to do it gently for some reason; this combined with the slight bit of turbo chatter you get a split second before the DV opens makes me think the bypass makes the DV slower to respond when it needs to open, possibly causing damage to turbo.... It is also possible to get chatter when coming off the throttle under part acceleration which I never got before the bypass...
I am tempted to put my green spring back in with the bypass to see if this improves that problem....
Dont suppose this has helped you as its by no means an argument for or against! its nice to get rid of the annoying n249 interference, but I am not convinced its good for the car!
^^ no mate, that's good info. I see what you're saying and I do think it will help the smoother acceleration, but worry about the throttle release being hasher plus the possible damage to the car/turbo.
I know it's a cheap and easy fix, and my car is ok to have this done since I have a stage 1 remap and a forge 007p.
Anyone else wanna chip in?
I know it's a cheap and easy fix, and my car is ok to have this done since I have a stage 1 remap and a forge 007p.
Anyone else wanna chip in?
Just give it a try and see what happens mate, you can always revert back to standard if you dont like it.... I can't see it immediately blowing up your engine to be honest!
did mine yesterday and it feels like a different car to me. the boost is more aggressive for sure
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