seano

Can anyone tell me what the diffrence is from an older style hks dumpvalve to the new model, as in ssqv 11. Thanks

seano

anyone

killa

iTrader: (7)

I think they changed the design due to too many copies made as on fleabay.. new design no copies yet..

top_fuel

iTrader: (1)

theres some info on the new design here mate...

HKS Super SQV Sequential Blow Off Valve

rkbycrof

Hi there,

Can anybody describe the difference in sounds, I notice on the link above you can buy different inserts!

trails

iTrader: (41)

purple insert standard lorry airbrake noise

gold insert very loud lorry airbrake noise

re-circulating kit; silent whoosh free zone

rkbycrof

Not a fan then? I don't know which way to go, all I want is to recreate the rally car chirp, I know this is an artificial way of doing it but I don't want to sound like a lorry or bus.

trails

iTrader: (41)

they can actually harm your engine so aesthetics aside i'm not a fan; imo they are pointless...best bet is to do a search on 'waste gate chatter' you will get all the info you ever wanted and more

rkbycrof

I've heard they can harm your engine by diluting your oil with unburnt fuel but i thought as long as you changed your oil more regularly than normal then you should be fine.

I thought the chirp was created by forcing air back over the turbo vanes the wrong way so to speak, but this greatly reduces the life span of your turbo, great on a rebuilt rally car but not so great on an everyday road car.

trails

iTrader: (41)

pretty accurate, being very lazy I just cut and pasted this from wikidedia;

Wastegate chatter myth
There is a common myth in the automotive world about so called "wastegate chatter" or "turbo flutter", a noise created on lifting off the throttle in a turbocharged car. The sound is commonly described as a chipmunk or a rattlesnake and 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 housing of the turbo after having hit the now closed throttle plate. This is also known as Compressor Surge and over time can result in significant damage to the turbocharger. It damages the turbocharger by bringing the compressor blades (which spin in excess of 100,000 RPM) to a near dead stop almost instantaneously. This puts an enormous amount of stress on the blades which causes them to fatigue faster. To avoid this turbocharged cars will use a blowoff valve (BOV), which allows the extra pressurized air in the intake out. However, in some cases, i.e. where it doesn't open fast enough or is setup to only react to high boost, some chatter will remain.

The chatter noise is very noticeable on WRC Rally cars, where no BOV is allowed.

Don't forget the possibility of Bore wash...tbh there are so many urban myths connected with VTA's its difficult to seperate fact from fiction, i guess you pays your money and takes your chance.

ian