37 replies to this topic

[Exmantaa]

Just fit your modified NA box, as that has a larger filter than the Turbo. No whining!

Edited by Exmantaa, 28 April 2011 - 10:31 AM.

[FLD]

Joe, make a periscope for the inlet. This way, when you bin it, I can get all the good bits off your car. I'm like the cats waiting for opposable thumbs, I'm just biding my time. Whens your first outing?

[techieboy]

I think techie was looking into fitting a turbo one... Not sure what the outcome on that was though

Going with a modified NA airbox. Consensus from those who understand these things is that the NA airbox is actually able to flow more air than the turbo version. Will hopefully dampen some of the sound waves that come back out of the compressor when the throttle is open and bounce them around in the airbox instead of shooting them straight back out of the cone filter.

P.S. Measured 90.0db @4000rpm on the Cadwell static test yesterday with the new Tullett swap-in silencer/cat replacement.

[The Batman]

Front end is all back together apart from headlights and bonnet Interior will all be in apart from dashplares and the plastic door card bits as they are getting covered and the pax seat wont be in until the cc tank is here Rear still has a lot of bits to do such as electric water pump plumbing which i can't do without some special adaptive which are on order and an exhaust and i need a base map for the z20 ecu aswell So not that fair away really just waiting for parts.... Then it will all fly together

[FLD]

P.S. Measured 90.0db @4000rpm on the Cadwell static test yesterday with the new Tullett swap-in silencer/cat replacement.

Sounds like they've finally made it work then.

[MartinS]

Apparently the noise created within the sc primarily gets out through the cone filters (Winstar souce of this info). Not suggesting blocking airflow in any way, just surrounding that area with sound absorbing material. I have bought this http://cgi.ebay.co.u...=item23103eaeb8 Martin s

[The Batman]

Is it still called dynomat? That is One of the best stuff i know off but i think techies idea will be best

[techieboy]

P.S. Measured 90.0db @4000rpm on the Cadwell static test yesterday with the new Tullett swap-in silencer/cat replacement.

Sounds like they've finally made it work then.

Yep. Still can't believe it, as it sounds much louder to me, in the car.

So that's been 96.2db @ 5400rpm at Snetterton last month and 90.0db @ 4000rpm yesterday at Cadwell. Still a little unrealistic as it's not under load and the charger isn't doing it's impression of a siren during a static test but can't see it getting any better than that.

Impressions from those that I drive by is that the exhaust noise is not so much loud as just very deep sounding. Oh and yep, it does belch out a flame on the overrun on track.

[techieboy]

Is it still called dynomat? That is One of the best stuff i know off but i think techies idea will be best

Yep, dynomat is brilliant but fecking heavy.

[The Batman]

I wonder where the happy medium levels for everyone is set? Where wait becomes an issue etc god I don't want to go outside

[The Batman]

Saying that it's not as heavy as a oem air box

[techieboy]

Three of four sheets of Dynomat would probably be heavier. The only thing in the world that is denser, is uranium.

[alanoo]

I always wanted to fit a mk2 Clio V6 airbox on mine, as it is one of the biggest OEM airboxes available and used on many RenaultSport racing cars (Clio Cup, Clio R3...)

[techieboy]

Oooh, now that's nice. /scoots off to eBay to have a look

[Winstar]

I looked at this a bit for DG when he was looking at developing a VXT inlet and found as said that anything other than stationary the flow came from the ear, it was also interesting that the pressure loss of an open cone was higher at speed due to the turbulence in the side pod (the NA may be less influenced by this as there is no ear forcing the flow into the pod. But that's as far as we got before I got too busy at work and he sold up.

I always wanted to fit a mk2 Clio V6 airbox on mine, as it is one of the biggest OEM airboxes available and used on many RenaultSport racing cars (Clio Cup, Clio R3...)

Big isn't always better it depends if the design allows all the filter to be utilised and how the flow is slowed down/spread out to pass through the filter and then accelerated again. It does look like a decent design but one that induces swirl in the flow to accommodate the inlet and outlet angles.

The outer shape of the NA airbox is good for promoting even flow however it was ruined by the cone and internal pipe. I noticed this when I first changed my air filer which was heavily loaded in the area where the internal pipe exited into the lower plenum. Since I modified the box to the filter loading has been perfectly even (also can't say I really noticed any dip in torque and it seemed better at the top end). The only bit that really needs some work is all the square edges that are left over when you unclip the cone.

Edited by Winstar, 30 April 2011 - 08:48 AM.

[Exmantaa]

I shortened that inside cone and made a nice flared trumpet on the small remaining part.

[smiley]

Here's a german engine bay, soundproofed (no idea on noise level reduction though)

Edited by smiley, 30 April 2011 - 12:36 PM.

[alanoo]

Big isn't always better it depends if the design allows all the filter to be utilised and how the flow is slowed down/spread out to pass through the filter and then accelerated again. It does look like a decent design but one that induces swirl in the flow to accommodate the inlet and outlet angles.

The outer shape of the NA airbox is good for promoting even flow however it was ruined by the cone and internal pipe. I noticed this when I first changed my air filer which was heavily loaded in the area where the internal pipe exited into the lower plenum. Since I modified the box to the filter loading has been perfectly even (also can't say I really noticed any dip in torque and it seemed better at the top end). The only bit that really needs some work is all the square edges that are left over when you unclip the cone.

I agree, my point wasn't "fit the biggest you could find".
I am still using a modified OE box, with twin inlet pipes (with trumpets/velocity stacks, not bare pipes), removed cone and a very short trumpet glued to replace it, and a (real) F1 air filter.
It still gives me 15 to 20 mbar more vacuum at load compared to without the airbox