LIL has full boost and full revs
- Thread starter Diver944
- Start date
Indi9xx
New member
A lot of the noise you can hear in a MAF or MAP car with a cone filter is noise generated by the turbo induction noise and dump valve dumping into the pre turbo intake.
Much of the problem is that the turbo and dump valve have line of sight to the cone filter and outside world.
Noise likes to move in straight lines or to reflect... As it reflects it looses some of its energy as its absorbed by whatever it has bounced off of.
Correctly formed bends in tubing will increase the amount of reflections without seriously impacting airflow.
If the location of the cone filter, or filter element is surrounded hard objects, then again the sound will reflect and maintain much of its energy.. if the objects near the cone filter are more absorbent to sound waves, then more sound energy will be adsorbed.
In other words, some carefully formed bends coming from the maf, to another location for the cone filter, somewhere cold. such as inside the front bumper, via the inner wing snorkel hole, with hard items surrounding the filter coated in a sound absorbent material, will reduce the sound levels in a big way... We could also use some audio attenuator design elements to further reduce the noise.
Diver944
Active member
Mein Gott I hope that works, the noise is driving me insane and I'm sure everyone is looking at me all the time as if I'm 17 years old (I wish 
)
I've been in Tonys car fitted with the same kit and there is audible noise but it's not intusive like this one. I was expecting an increase, but this is just awful (to me), I'm almost scared to lift off the gas and change gear. However it does illustrate audibly just how soon this turbocharger starts to spool up. In any gear from as low as 1500rpm you can hear the whizz start to gather momentum. Even if you are at a steady speed (say 30mph in 4th gear), if you start to climb a slight hill you can hear it start to whizz up as you apply more throttle just to hold the 30mph as you climb.
)I've been in Tonys car fitted with the same kit and there is audible noise but it's not intusive like this one. I was expecting an increase, but this is just awful (to me), I'm almost scared to lift off the gas and change gear. However it does illustrate audibly just how soon this turbocharger starts to spool up. In any gear from as low as 1500rpm you can hear the whizz start to gather momentum. Even if you are at a steady speed (say 30mph in 4th gear), if you start to climb a slight hill you can hear it start to whizz up as you apply more throttle just to hold the 30mph as you climb.
Guest
New member
ORIGINAL: Diver944
Mein Gott I hope that works, the noise is driving me insane and I'm sure everyone is looking at me all the time as if I'm 17 years old (I wish
I've been in Tonys car fitted with the same kit and there is audible noise but it's not intusive like this one. I was expecting an increase, but this is just awful (to me), I'm almost scared to lift off the gas and change gear. However it does illustrate audibly just how soon this turbocharger starts to spool up. In any gear from as low as 1500rpm you can hear the whizz start to gather momentum. Even if you are at a steady speed (say 30mph in 4th gear), if you start to climb a slight hill you can hear it start to whizz up as you apply more throttle just to hold the 30mph as you climb.
Paul,
Have a look at the Lindsey Racing MAF trap. I am sure you could build something quite similar that would reduce the induction noise. You should hear the induction noise on my big block V12 it sounds like a MiG taking off!!
Diver944
Active member
Cheers Tom. I actually have a LR MAF trap (thanks Fen) and had a look at fitting it yesterday then covering it in black felt. Unfortunately I can see no way of getting the LR product in there, I think it needs the headlight bars removing entirely. I'm starting to see why everyone moans about fitment issues with aftermarket parts supposedly custom made for our cars. I'm taking the car down to Jon's next weekend to fit the piggyback, I'll see if I can do something about the noise before then and if not then Jon can have a go []
]ORIGINAL: DivineE
"I was expecting an increase, but this is just awful (to me), I'm almost scared to lift off the gas and change gear."
[8|] but I like that noise[
I like the noise too, and I'm only a year younger than Paul. My view is it makes the noise it makes and live with it - if you deliberately create whooshes and chuffs then that's a different matter (and why I don't really like atmospheric dump valves), but if they come as a byproduct of making the thing faster then that's fine - provided they don't make it trackday unfriendly.
DivineE
New member
That's precisely my view as well I hate nothing more than an amplified 140db dump valve on an Escort 0.1ltr turbo.
However the noise produced by the Bugatti EB110 as it tries to release HUGE quantities of compressed air through the struggling waste gates and the flutter of the Audi Quattro S1 rally car dump valve as it climbed Pikes Peak are some of the best sounds I have ever heard coming from a car.
So when my own car makes a similar but far quieter noise as I back off the throttle too sharply going into a corner it puts a big smile on my face every time I would love to have a car where it was more audible.
Ben
Conversly, a sound is a sound, so if it bothers Paul then it probably doesn't makes much difference to him whether it's meant to be there or it's trying too hard to be there. I agree that the noise of some of the abovementioned cars are great, but having gone in my mechanics car with the Vitesse stage 3 kit, it makes a noise like a strangled turkey and I'm betting none of you would like what I heard. I will wait until I get my stage 5 fitted and see what transpires, but if it's like Sean's then I will be investigating some of Jon's suggested remedies. []
]
Diver944
Active member
LIL is nice and clean and tucked up in the garage ready for the run down to Bournemouth tomorrow and the fitment of the VR piggyback. Finally I will be able to safely turn the boost up from 15psi and she should then be at the end of her current development and ready for track at Bedford in a fortnight.
In a fit of pique and jealousy, the S2 decided to fail her MOT today with a blown rear number plate bulb and a crack in one of the exhaust hangers. Phew - that will be the cheapest MOT in many many years [8D]
In a fit of pique and jealousy, the S2 decided to fail her MOT today with a blown rear number plate bulb and a crack in one of the exhaust hangers. Phew - that will be the cheapest MOT in many many years [8D]
sawood12
New member
Bad luck Paul!! Still it sounds like it's not going to be that expensive to put right - it barely qualifies as a fail in my book!
Wow - so you are finally going to experience the full wrath of your 3.2. I bet it will be astonishing. What boost pressure are you planning to work your way upto?
Wow - so you are finally going to experience the full wrath of your 3.2. I bet it will be astonishing. What boost pressure are you planning to work your way upto?
DivineE
New member
Please do tell us how it feels once you've got it set up Paul, I'd love to know how much difference there is in 'feeling of power' compared to when I went out for a spin right at the begining. The figures may be a point to discuss but its the thrill of driving that interests me most.
Ben
Ben
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