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N249 Bypass guide LCR
- Thread starter rsmith
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- bypass guide n249 seat leon cupra r
What is the N249's supposed function, I've always thought it's a fail-safe for the DV. I've nearly tried this mod a couple of times but I'm not totally convinced it's a good idea. Do the advantages really out weigh the disadvantages?
Just done mine.Seems to be worth the £1.20 it cost me !!! The standard DV even let's off a little now.
Me thinks a 007 jobbie is next......so much for leavin standard(if i had a pound every time i've said that)
Me thinks a 007 jobbie is next......so much for leavin standard(if i had a pound every time i've said that)
So just to clear this up in my head in case I do something really wrong, I just need to connect the two hoses together (inlet mani to N249 hose --> N249 to DV hose)? And that's it?
I'm actually in shock that this car isn't costing me any money to modify this weekend 
. Thanks BoomhaueR!
. Thanks BoomhaueR!B3LSY
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B3LSY
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B3LSY
Guest
Just trying to hunt down a hose connector, Halfrauds (living up to their name truely) wanted £10 for a whole set of hose connectors and don't sell them separately. I'll have to pop to a motor factors today.
Don't get me wrong it's not the sound that I've got a problem with, in fact it can sound pretty cool. It's just I've always though wastgate chatter was a bad thing causing excess stress on the turbo. I'm not 100% certain on this btw and I'm happy to be corrected.
I robbed this off Wikipedia;
"Wastegate chatter myth
There is confusion in the automotive world about so called "wastegate chatter" or "turbo flutter". A noise created on lifting off the throttle in a turbocharged car, commonly described as a chipmunk or a rattlesnake, is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor wheel of the turbo after the airflow is abruptly halted by the throttle plate closing, called compressor surge. However, in some cases, i.e. where the throttle plate doesn't open fast enough or is set up to only react to high boost, some chatter will remain. Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed. Diesel engines have no use for a blow off valve as they do not have a throttle plate.
The chatter noise is very noticeable on World Rally Cars, where anti-lag is used.
A compressor stall like this can cause excess stress and wear on the turbo's shaft or bearings under higher load applications of the turbo (around 15psi and greater depending on the trim and flow rate of the compressor side).
Actual wastegate flutter occurs instead under partial boost conditions such as partial throttle near the boost threshold. It sounds like FftFftFft not ShuShuShu and is caused by the rapid opening and closing of the wastegate at boost levels near the spring pressure. It is commonly heard more clearly and may be more prominent on cars with modified intake silencers, up-pipes, and or downpipes, and is not harmful."
B3LSY
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I'm having loads of trouble locating a hose joiner. Where can I get one? Do I need 4mm, 5mm etc?
Just wondering, doesn't putting an internal connector reduce the airflow/pressure a bit?
Thanks for the link DG.
Thanks for the link DG.
The pipe's you have removed had internal connections into the anyway, when they were fitted onto the N249.
I didn't notice any problems with it.
I didn't notice any problems with it.
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