Chattering...

[dan_b]

Me again (been silent for a while I know)

Since fitting a K&N cone recently, I just wanted to ask about the chattering noise I now get off-throttle, - more noise when I'm booting it, less when I'm not. What is it? Why can I hear it now when I couldn't before? Should I worry about it? Should I be concerned that I now sound vaguely boy-racer-ish?!

Did a nice flaming exhaust pop yesterday, hadn't had one of those for a while

[s2driveruk]

hi,

I have a K&N Cone but other than a whoooosh on lift off and a good pop from the back i dont get any chatter (wish i did )

[Doug_RS2]

I get the chattering - I have a metal piston Diverter though - it is mounted higher up than standard and I have a big cone filter so the sound will come out of that.

[ADU_S2]

k&N

i have a question in regards to the k&N cone filters as they are open ended and sit not far from the turbo doesnt the build up of heat effect the filter. as a standard filter is boxed off right. some one told me that this was not good and can degrade the performance on the car.

ur comments would be good!!

how much fiffrence if any does a K&N filter make to performance any way?



QUOTE=Doug_RS2]I get the chattering - I have a metal piston Diverter though - it is mounted higher up than standard and I have a big cone filter so the sound will come out of that.[/QUOTE]

[martinjs]

I think on a standard setup the gains are marginal, but custom setups like dougs need a cone simply because the airbox wont fit anymore with a bleedin great turbo in the way and it needs all the air it can get.
but sod the gains anyway if it sounds like dougs i'd get one.

ps doug, you'll have to get a video clip of you overtaking someone like you did past me leaving billing...my eardrums nearly popped...sounds like a rocket is an understatement

martin

[Doug_RS2]

If you change to a open cone filter you have to get a heatshield in there to stop heat from the turbo getting sucked in. I have also got an 80mm diameter cold air feed to the filter. So while moving it is always getting cool air. I have to have a big open filter just to get enough air in, because it is running high boost. ITG rate what sort of power their filters are suitable for.

Martin - I need to get some video clips - I never really hear it going past me getting thrashed - especially now the GF is scared of it.

[ADU_S2]

ive never been in a car with K&N filter didnt know it sounded any diffrent!! SO DOUG does that mean there isnt much room left for an air box after upgrading to a KKK 26/27/29 ?????

ITS ALL GOOD

I think on a standard setup the gains are marginal, but custom setups like dougs need a cone simply because the airbox wont fit anymore with a bleedin great turbo in the way and it needs all the air it can get.
but sod the gains anyway if it sounds like dougs i'd get one.

ps doug, you'll have to get a video clip of you overtaking someone like you did past me leaving billing...my eardrums nearly popped...sounds like a rocket is an understatement

martin

[sal_s2]

Martin - I need to get some video clips - I never really hear it going past me getting thrashed - especially now the GF is scared of it.

I'll do the honours Doug, what do you say? :mischeif:

[Doug_RS2]

@ukrs2 - I think think you can just keep your airbox with a k26/27/29 if the inlet to it is the same diameter for the maf to turbo hose - mine wasn't so it was easier going with a cutome inlete pipes and the big filter. Athough Greg just managed to keep the standard parts with a small mod so it could be possible - I think if you are wanting a lot of power though you want it to breath easier.

@Sal - We have all seen your driving mate so I will decline your offer - Did you hear what one of the campers shouted at you when you launched your car?

[jubjub]

I would offer to do the honours Doug, but then you might not get it back

[ADU_S2]

???

I would offer to do the honours Doug, but then you might not get it back

what size Intercooler are u using doug rs2 or bigger?

have to come and see dougs s2 some time must be awesome...

doug once ur turbo starts spinning mate how do u rate the power torque comparison to an rs2 setup.

[Doug_RS2]

RS2 IC is good enough - the intake temps were not rising. I have an IC mister to put on to help in hotter conditions as well.

To be honest the RS2 setup pushed to the limit has a very savage(SteveH words) torque delivery - you will be hard pushed to beat that but it just runs out of puff. Mine certainly feels low on torque compared to that - but we haven't pushed mine yet - there is still more to come in a couple of months when Mihnea finishes his travels in the US.

I've said this before - if you have all the RS2 stuff - get that mapped to the max before you splash out upgrading more - Ask Sal what cars he has thrashed and what 1/4mile times he gets (in the wet) - he's getting it on the rollers this week to see what his RS2 spec is pushing out - I expect it will be a lot.

SteveH can compare the 2 since he is running the RS2 setup and was in my car at the weekend. They are totally different cars.

HTH

[S2central.net]

We should run a book on this one

I reckon the RS2 config is the best compromise turbo if you want strong torque in the mid range and don't need more than 400bhp at the redline. Actually the RS2 will run out of puff about 380bhp.

But for the big boys willing to sacrifice some torque in the low and mid ranges with a view to getting ~430bhp then Mihnea'c funky hybrid K26/27/29 turbo looks like a winner.

RS2 intercooler and a healthy supply of cold air are required in either case - along with a good exhaust system of course.


Paul

[Doug_RS2]

I think the bigger Garrett GT range might be the choice for upgrading over an RS2 turbo - I know Mihnea is looking at that for his car.

[ADU_S2]

mihnea

I think the bigger Garrett GT range might be the choice for upgrading over an RS2 turbo - I know Mihnea is looking at that for his car.

I would like to see what figures mihnea will turn out of his with the garret turbo.

@DOUG
if Mihnea gets good figures that mean that ur gonna be going for yet another upgrade

tempting i bet

it will be interesting to c what u get when mihnea finishes with urs