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kinda late getting back on this one...

this is a pretty popular thread...

yeah, I guess you need to maintain high exhaust gas temperature...but I don't know how you can get cold exhaust gas temperatures...

it's exhaust gas...it's hot.

how do you get this "bad" cold exhaust gas, I don't think it's even possible...maybe I am just totally lost...happens all the time...really.

-vq

 

How come you don't burn your hand when you put in back of the muffler opening? Because it's cooled down considerbly. Try putting your hand on the outlet end of one of the exahust manifolds(if that was easily done)

Hot gases expand(accerlate). Cooling gases contract(slow down).

 

see, that's were I was lost, I was assuming we were talking about the air coming out of the exhaust manifold...or even closer to RIGHT were it comes out of the chamber...

I can see where it is hotter there, and has alot of travel to cool down by the time it gets to the muffler,

was the other guy (the one I was agreeing with) suggesting that there need be a long distance between the exhaust exit from the chamber to where that gas enters the part of the turbo that does the spooling?

-vq

 

There are 2 turbos, and they spool up sequentially. One to eliminate turbo lag at low RPM and the other to keep it running hard at higher RPMs

 

Hmm.... how I missed this one all day I have no idea.

Anyways.

 

OMFG!

 

No. You want the exhaust to hit the turbine as soon as possible(ie.. before it gets a chance to lose velocity(from distance and cooling)

 

So do you want hot air to come in your intake so it can suck it in faster? No. It's not as simple as hot=fast cool=slow. Hot gas gives more pressure, but it's not uni-directional. Hot exhaust gas equals more back pressure too. Cooler air takes less volume and can flow more freely through the restricted exhaust pipe. So you can see it's not as simple as you state, which is why people sometimes lose power when replacing their exhaust because there are too many factors at play.