Jump to content
SAU Community

Airflow On Exhaust Side Of Turbo

Taso84

By Taso84,
in Engines & Forced Induction

 Share

Recommended Posts

Taso84 Mentor

Taso84

Posted
Posted

Need a question answered regarding pressure for my hydraulics assignment

On the exhaust side of a turbo is it better to have high pressure after the turbo (ie just before front pipe exhaust) or low pressure.

Was speaking to this guy at autobahn, he reckons that it is better to have high pressure. He was basically saying that if i on my 33gtst with stok turbo, upgrade the front pipe to 3' (got the stock 1 now) i will actually increase lag because there will be less pressure. Is this true?

My instincts say no, u would want the pressure to dissipate thus increasing air velocity and in turn making the turbo spin faster. Ie i should upgrade the front pipe.

Any1 know what the answer is?

Link to comment
https://www.sau.com.au/forums/topic/117153-airflow-on-exhaust-side-of-turbo/
Share on other sites
mad082 Grand Master

mad082

Posted
Posted

a turbo is spooled up by the exhaust gases passing through it. so having less pressure means that more air can pass through the turbine in the same amount of time. if it was a natro car you want some back pressure, but that has more to do with the scavenging effect.

discopotato03 Grand Master

discopotato03

Posted
Posted

In a perfect world there would be no pressure south of the turbine at all . Gas only wants to know about flowing from an area of higher pressure to an area of lower pressure so you want the pressure drop across the turbine in order to drive it .

Cheers A .

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      NC MX5

      By The Bogan · Posted

      So, version 4 intake is on its way I was looking at these a while ago but at around $200 or more it was a little pricey for something that might not work, but, I had it in my watch list, but, I got a message saying it was on special, and I had a code thingie to use, it eventually came in at $120 delivered, so BAM, BUY NOW.....LOL I'll need to have a look when it arrives but I feel it will "look" better than what I currently have, as it comes with a PCV fitting, so I will be able to get rid of the alloy pipe that goes to the throttle body with the PCV fitting  Well, that's what the voices in my head are telling me  Oh, and this happened today Yeap, it was a Trojan, and it was cheap, so I headed back to the hardware store and actually spent a little bit more on a heavy duty,  one that was actually recommended by a plumber mate, a Cyclone one with a fibreglass handle that is actually rated for clay The broken shovel will eventually be "modified" into a short handle shovel
    • MBS206
      What should I do next to hold the head on

      By MBS206 · Posted

      When you pulled it off, there is no signs of blown head gasket? Is it possible you have some other issues going on? Possible cracked blocked? Or do you think it's straight up lifting the head? Did you check what the head was torqued to before pulling it down (To see if possibly they're stretching, or starting to break threads out etc)?
    • jez NF
      The Evolution Of "night Fury"

      By jez NF · Posted

    • Rezz
      Chris' Toyota Mark ii JZX110

      By Rezz · Posted

      Seems like a decent result for a modded JZX110. They are bulky in comparison to the 100 and 90 models (which I'd prefer myself) but they are getting very few and far between here in JP these days. Thanks for the detailed review and the import process into the UK. I also have a car which I'm hoping to export from Japan at some stage so it's good to know if someone from the UK was interested in it. By the way the corrosion underneath is par for the course for cars which were located in/near the mountains or along the Japan sea coastline. They get huge amounts of snow every winter and the sodium chloride is used on the roads. Many cars have some kind of rubber like treatment underneath but they tend to limit it to the wheel arches underbody and fuel tank. Suspension arms and sub-frames will have similar corrosion to your JZX110 which is a common sight. See it all the time and car dealers here generally don't even mention it unless asked.
    • Kinkstaah
      new 1.5 LSD issues/concerns

      By Kinkstaah · Posted

      If the sound goes away when you clutch in, the 1.5/2 way diffs are just shit, and you are a normal person. The diff is likely "fine" but driving at anything under 30kmh is a violent horrible experience. It would be exaggerated with solid diff bushings and subframe bushings if you have those.
×
×
  • Create New...