S1 whistle.

[K7ERG]

Removing the stock airbox also allows this chatter. Amplified through the cone filter.

[Rusty]

zorst = exhaust. sorry.

[DJones]

I could be very wrong.....

But i think it has something to do with the primitive anti lag system (cant remember the name) cuz the S1 didn't make this noise nor did it have the anti lag system. But the S1 E2 did and it had the anti lag system.

[Casper...]

This S2 makes the sound...

http://www.garaget.org/?car=4460

Casper...

And yes i was wrong.

[Animal Mother]

This S2 makes the sound...

http://www.garaget.org/?car=4460

Casper...

And yes i was wrong.

Jesus! I wouldn't want to go through a puddle in that thing!

[Jas11n]

I could be very wrong.....

But i think it has something to do with the primitive anti lag system (cant remember the name)

"umluft" I think it was called
Lehmann built system with an extra wastegate.



Picture is from James Bufkins site >>> Linky

[Casper...]

I have a picture from att S1 engine bay where that system i used...
But i dont thing that the reason the sound coming!
The thing with the valve sounds more likely.

[Billman]

It is turbo stall. if you drive without a BOV then you are going to have it. Big trucks also make that noise.

[newsh]

Its a cool sound but its slower than running a proper recirculating valve, with the recirc the air from the DV is directed back at the impellor helping the turbo to keep spinning between gearchanges.

[andrewd]

I achieved that exact same sound a few years ago by (as has been said!) removing the DV on my then Impreza Turbo and blanking off the holes. The sound is the air being forced back over the still spinning compressor blades. As has been said, it doesn't do any favours to the turbo and puts extra strain on the post-turbo pipework, intercooler, etc.

Surprisingly I found it significantly reduced turbo-lag. I can only put this down to the post-turbo pipework & intercooler remaining pressurised between gear changes more than offsetting any losses from the turbo slowing down?

Not got the balls to try it on the S4 .. it is 15 years old this year!

[Billman]

Many cars by Lehman using Polygon axles on the turbos running without DV so the Lag is reduced. If is reduced someone must test and see.

[terrybullwon]

The 5 cylinder symphony No.9 by audi sport teams

http://www.youtube.com/watch?v=UsMQRRVPmDw

[robo]

This S2 makes the sound...

http://www.garaget.org/?car=4460

Casper...

And yes i was wrong.

I dont think this car ever made any sound.............?

[quattro84]

I dont think this car ever made any sound.............?

It did but not with this setup. Stertman was involved in this enginebuild. I've seen this car for sale. Last thing i did see from Hacke was a Nissan Sylvia on a tubular chassis.

[j dog]

im not a fan of the dv noise, on all my turbo cars - maestro turbo, evo 8, evo 5 and my s2 i've always blocked off the dv with no reliabilty or performance worries. it makes people think that it's a highly tuned car with the chatter noise