I have a question about if the exh is too free flowing that it will not spool the turbo up as fast or as high?

does the turbo need some back presure to do it job?

 

No. Everything I have ever seen says the turbo itself is all the backpressure you need. That's why I'll have a 4"DP on my new custom turbo... :] IT'll be here in a week.

-Chris

 

Yep. The turbo is under pressure anyways so even having the exhaust open at the turbine side of the turbo isn't going to hurt anything.

well maybe a fire but ........ whatever work right

 

just seams that my turbo is spooling later now that I have gone to single 3 inch exh with only a muffler that 3" in and 4" out

 

From what I can remember about turbines from my thermo classes, is the bigger pressure differential, the more energy that can be extracted.
I would think that would translate into the turbo spooling faster if it did not have as much resistance to do so.

Just a thought

 

There is no such thing as "not enough backpressure" for *ANY* engine especially on a turbo car!

Having driven turbo cars with no exhaust to speak of, just the elbow the downpipe attaches to, I can tell you.. spool up is GREATLY enhanced!

NOW.. If you have insufficient wastegate you can run into a problem where you cannot control your boost level to where you want it, because it's TOO EASY to spin up that turbo. Of course the solution could be to get a bigger wastegate, or you could get a bigger hotside and make more power as a bonus.

 

maybe the muffler isnt as free flowing as before?
i went between an old hks sport and a new apexi n1 single on my t2 and the hks would make more boost than the apex. just because its shiny or single doesnt mean its better

mike

 

Boost leak maybe ...

 

The Apexi N1 single is pretty free flowing, I would assume better than the HKS sport.

 

that was just an example, but no the hks moves more air despite it not being sexy, it was louder too

mike