hi guys, i just bought a greddy tt kit for my 2006 g35.. i heard about something i can get dumps? what exactly is this for? im sry i know nothing about turbos, but im learning ..

 

most of us learn and then buy but pretty cool if u can do it the other way around.. GTM took the route of recirculating.. open dump is very similar to running open header if im not mistaken. Too loud for my taste.

 

Very loud, and not a cool-sounding loud either, IMO.

 

open dumps.... they take the exhaust gases that are by-passing the turbo via the wastegates and dumping them straight out to the atmosphere. Generally turbo setups reroute these gasses back into the exhaust system. By dumping them rather than rerouting back into the exhaust, you are relieving backpressure

Open dumps are only loud when boosting to the point your wastegates are opening

 

^^^^

+1

To answer your question in a little more detail, without wastegates, your turbos will continue to spool faster and increase boost as you increase the exhaust flow, which is based on your rpms and the amount your throttle is open. You use a boost controller to control your wastegates to open once you achieve your desired maximum boost. Essentially, the wastegates keep as much pressure on the turbos as necessary to hold the boost, but funnel any extra exhaust gases to the dumps to keep the turbines from spinning faster than they need to for your desired boost pressure. So, the dumps work with the wastegates to channel exhaust flow around the turbos once you have reached your desired boost. When you set your boost level, you are actually setting the pressure at which the wastegates open. Open dumps are usually fairly short and just dump the extra exhaust gases out just behind your engine compartment. Closed dumps are dumps that feed the extra exhaust gases back into your exhaust system.

On my Greddy kit, Japtrix re-routed the dumps back into the downpipes, which are connected to the exhaust pipes (Greddy Evo TT in my case). That is a little unconventional, but it keeps everything nice and quiet. There will be a bit of an increase in back pressure, but I don't know whether it is enough to make a significant difference on a moderate HP build that has a fairly good exhaust system. The difference will be more noticable on a very high hp build, in which case you typically want the lowest exhaust back pressure that you can practically achieve. That would happen with open dumps, but open dumps are LOUD.

The one thing I noticed with my dumps is that they broght them back into the downpipes at an angle, maybe 45 - 60 deg. or so from perpendicular. That should help to minimize turbulence as the two exhuast flows merge in comparison to bringing it back in at 90 deg. Also, they broUght the dumps into the downpipes pretty far down stream from the turbos (as much as practical). It worked great for me and my engine made more HP than I anticipated on 93 octane (we got over 600 whp). On the new setup, they will be doing the same thing. I'm shooting for bigger hp, I'll post the results when it is complete. If I don't make my HP goals with the closed dumps, I can always open them back up. I prefer closed dumps, so hopefully I acheive my HP goals with the closed dump configuration.

 

Dump the air, hence the name...

 

ummmm, they don't dump air.....

 

ok, whatevr, exhaust bla, bla.. Same ****.. There is this new thing called GOOGLE OP.... Search.....

http://www.google.com/search?hl=en&s...=f&oq=&aqi=g10

To escape or pass out: Steam exhausts through this valve.

1. a. The escape or release of vaporous waste material, as from an engine.
b. The fumes or gases so released.
2. A duct or pipe through which waste material is emitted.
3. An apparatus for drawing out noxious air or waste material by means of a partial vacuum.