It's hard to tell from the pic, but it ends right before the last bend in the downpipe..would it make a big difference if i routed it towards the back of the car?




thanks in advance, and if anybody wants to post up pics of other setups it would be much appreciated.

 

http://forums.evans-tuning.com...ptube

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "boosted hybrid" &raquo;</TD></TR><TR><TD CLASS="quote">No, egr is the story. If you are discharging hot exhaust gas into the compressor that is one thing, if the discharge is pointed in the complete opposite direction and power loss is severe that is another.

Exhaust gas recirculation kills power. EGR is for emissions purposes on OEM applications. N0x is greatly reduced using EGR, and thus lowers formation for emissions purposes. This also reduces power potential from an engine.

In a forced induction application, the compressor inlet generally sits within the area near the dumptube discharge. With no dumptube, the wastegate exhaust gas discharge is expelled into the area in the engine bay. Even if the discharge is not pointed in the direction of the compressor inlet (i.e wastage discharge pointed downwards on EL manifolds, wastegate discharge pointed towards radiator on log manifolds, etc), the available oxygen content in the engine bay is severly reduced. When you compromise the available oxygen being injested into the engine through the compressor inlet (the only available air source), you lose power. Less oxygen available in the combustion process, less cylinder pressure developed and less torque and power produced.

There has been many customers that come for tuning that have a dumptube, but does not go underneath the oil pan. While on the dyno, the discharge reflects off of the floor of the shop and gets injested into the engine. By simply adding a flexible extension on the dumptube to bring the exhaust gas underneath the car, i have seen gains of anywhere from 10-50whp. I have had multiple customers cars that dont have a dumptube at all, and by adding a dumptube underneath the oil pan have picked up between 20-90whp worth of power.

Here are some examples that i have collected from past tuning sessions:



*This was on an LS engine that had no dumptube. It was using a log manifold, with a tial 38mm gate. The discharge was spraying downwards in the engine bay, with the compressor inlet facing the passenger side. By simply fabricating a dumptube that went underneath the oil pan the gains seen in the dynochart were realized. Solid lines being same psi and tune with just the dumptube added.



*This was on a FR equipped built b16a engine. The FR kits do not come with dumptubes (nor do any other kits out there). The compressor outlet on the 44mm gate was pointed towards the radiator, compressor inlet on drivers side. By rotating the dumptube up towards the ceiling, and adding a 5" extension 90whp worth of power at the same psi level and tune were realized. NO OTHER CHANGES WERE MADE! EGR is very significant.



*This car had a dumptube with a traditional log manifold. It pointed downward and stopped half way down the radiator. By simply adding a 90 extension to the dumptube and pointing the discharge under the oil pan, the gains showed were realized.

I have many more graphs that prove this theory correct. By adding a dumptube that goes under the oil pan, or adding an extension to an existing one power output is dramatically increased. It not only makes more power, but the engines ability to knock is greatly reduced. Its a simple, overlooked item that will make a dramatical power difference.</TD></TR></TABLE>

that should just about answer your question.

 

good info...i guess i was just using the wrong terms when i was searching..Time to make a new dumptube

 

good stuff

i have my dumptube ponted at the inlet when i dyno so i put an extension on it and wow a big damn difference

but i dont know if i need to do a retune?

aany one have a input thanks

sorry for jacking thread

 

Put a 90 deg turn and a short extension on today..honestly it made a difference...it pulls a little harder and smoother up top.