dyno run with open dump wg

[nize]

here's the long awaited video, you can hear the wg dump open at around 33seconds;
http://video.google.com/videoplay?docid=6894483714065185431

[chitown944]

i couldnt hear it

[nize]

33-34 second time mark. you can clearly hear a change in the exhaust tone.

[Darkhorse]

What are the benefits of an open waste gate dump apart from the sound? Is it just the reduced weight or are there some extra HP to be gained?

[nize]

no real benefit, just easier when installing an aftermarket tial wastegate.

[soxnail]

Reminds of the "screamer pipes"
Sox

[nize]

i also have a straight pipe that i can swap the muffler for. now that's loud.

[soxnail]

you up late...
Sox

[nize]

working on the car and such.

[Darkhorse]

My 930 dumps straight to atmosphere but I had that done at the same time as some other mods so I couldn't tell whether it made any difference.
Still sunny over here!

[soxnail]

Ok remember the tequila goes into your mouth and is not to be used for cleaning parts or as a ignition helper
Sox

[soxnail]

Darkhorse where you at I go the Oz all the time was in Melbourne 3 weeks ago. I like Sydney a lot better.
Sox

[Darkhorse]

I've been in Melbourne for 2.5 years. I like Sydney better also!

[soxnail]

Yah I have to go to Craigiburn on and off Oh joy
Sox

[blown 944]

what kind of numbers did you end up with? At what boost levels?

[Darkhorse]

Not the most picturesque part of Australia. Next time you're over hire a car and drive the Great Ocean Road or head for the Yarra valley around Marysville/Healsville. Great roads in a P-car.

[soxnail]

Yarra valley produces some of my fav wines.
good nite Sox

[mfloren]

Originally Posted by Darkhorse

What are the benefits of an open waste gate dump apart from the sound? Is it just the reduced weight or are there some extra HP to be gained?

there is typicaly a 3-7hp gain from the lack of additional pressure being generated in the exhaust by dumping it back into the exhaust stream from the turbo.

a vent to atmosphere is prefered on high boost cars and is noticed while in it or while driving next to it.

[nize]

Originally Posted by mfloren

there is typicaly a 3-7hp gain from the lack of additional pressure being generated in the exhaust by dumping it back into the exhaust stream from the turbo.

what are you basing this on? do you have data?

i have before/after dynos and it shows absolutely no difference.

several other 951 owners i know who are dumping to atmosphere also have seen zero difference in power.

[74goldtarga]

It sounds good, I will keep that option open in the future. Thanks for sharing.