Well I sure as hell didn't loose anything on my truck and it's stock tune dude. Sorry. Truck has never ran better.

 

Sorry I have to agree with him you are wrong !!!

Here is some good info from an engineer with garrett turbos
http://www.tercelreference.com/terce...st_theory.html

The less pressure behind the turbine is always optimal

 

You might not feel much. But you should dyno it stock and with your downpipe. I bet there's a power loss at lower rpm.

 

Ok. Just my 2 cents. Good luck guys.

 

No it's not like back pressure in a na motor sorry

Quoted from the above document written by a Garrett engineer

" Downstream of the turbine (aka the turboback exhaust), you want the least backpressure possible. No ifs, ands, or buts. Stick a Hoover on the tailpipe if you can. The general rule of "larger is better" (to the point of diminishing returns) of turboback exhausts is valid. Here, the idea is to minimize the pressure downstream of the turbine in order to make the most effective use of the pressure that is being generated upstream of the turbine. Remember, a turbine operates via a pressure ratio. For a given turbine inlet pressure, you will get the highest pressure ratio across the turbine when you have the lowest possible discharge pressure. This means the turbine is able to do the most amount of work possible (i.e. drive the compressor and make boost) with the available inlet pressure. "

 

do you have any factual evidence to back this up? or is this just based on your mashing the gas and thinking it feels faster? running any turbocharged vehicles with anything more than an aftermarket muffler on a factory tune is a horrible idea to begin with because of the fluctuations in boost. but running your truck untuned you're basically pissing away money if you wanted to make more power anyway, all of those mods don't amount to squat without proper tuning.

what TwinTurboFX4 said is absolutely 100% correct. you get the same effect from putting less restrictive headers on a supercharged vehicle - a loss of boost from less backpressure in the lower RPM range.

 

That's where it feels the best. And where I spend 95% of my time. Less than 2000rpm. You do realise its possible to make more power with less boost if restriction is removed and efficiency is increased?

If I neck my pipe down to 1" and boost wants to go to 50psi because of the restriction, does that mean I'm on my way to huge gains?

 

Turbos use the back pressure way different then a blown motor. It's the pressure drop from one side of the turbo to the other that makes it optimal. Just read the above article

You are dealing with two different theory's. I'm not trying to start an e battle at all but what you posted is wrong

http://www.tercelreference.com/terce...st_theory.html

Please everyone stay on topic and non hostile this is good information for everyone

 

I'm done. I don't do Internet pissing matches. Put a down pipe on yours and drive it. Get back to me.

 

Not wasting money.