steve McCulloch

Can someone pls explain to me in layman terms why a vent to atmosphere dump valve is very bad for the Scooby engine

I like the sound of them but various sources say dont bother - stick with the Forge internally venting one - no one has really explained why!

Thanks in advance

Mr.Cookie

The way i've understood what the more technical people on here say

Venting to atmosphere means that sensors will see a less rich mixture than is actually present, engine management will try to compensate and make mix richer still, which will end up coking up cylinders.

Si
Peparing to be told he knows squat

steve McCulloch

Sounds about right

I do like the noise though..... damn - presumably it applies to all ECU's and cant be adjusted for?

RussP

ON the other hand, running an Sti on our cr@p fuel probably isn't a bad idea! Better coking 'em than cooking 'em!

Tom Evans

Steve,

I e-mailed passion motorsport about this as I liked the sound of a vent to atmosphere d/v and they said that the Forge d/v has been designed in such a way that this will not be a problem. Whether this is the case remains to be seen.

Cheers,
Tom

steve McCulloch

Tom

Unfortunately the Forge one I have makes no noise as its internally venting!

I may put one on from time to time - I think thats the mesaage - It only takes a minute to change them

Andy Tang

iTrader: (3)

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by Mr.Cookie:
<B>Venting to atmosphere means that sensors will see a less rich mixture than is actually present, engine management will try to compensate and make mix richer still, which will end up coking up cylinders.[/quote]

Just to add to this, from what I understand. As the car is running richer, it will also be more likely to produce flames if you don't have cats on the car!!!

Also heard stories of lumpy idling.

Andy

Andy W

I still have the std DV on my RB5 but with the scoobymania, twin dump Downpipe I do hear the DV quite a bit more, only my two-penneth worth!

Andy

RussP

I've got the HKS externally vented on my Sti, and got told today on the Clang'n'Ball that there was some pretty tasty flames from it.... Cool! Great noise, flames, what more could you want?

MorayMackenzie

Steve,

If you are running a Link or Motec ecu it is highly unlikely that you are using the MAF sensor anyway... these ecus are generally mapped using revs + manifold pressure as the load input... so... if you are still running a link (and not using the MAF sensor)... you should have no problem whatsoever running a vent to atmo BOV as the MAF related problems are simply not going to happen.

Moray

Gerg2

Flames??? All I get is a black smoke

Karlos

I had the Blitz Super Sound BOV on my MY96 which dumps to atmosphere. Didn't notice any problems with it.... and I did over 112,000 miles in that car!!!

Sounds 'kin ace too!

Karlos

WREXY

I second Karlos, although I've only done 5500 miles and mine is a MY00.